path: root/security/nss/lib/ssl/ssl3con.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * SSL3 Protocol
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* TODO(ekr): Implement HelloVerifyRequest on server side. OK for now. */

#include "cert.h"
#include "ssl.h"
#include "cryptohi.h" /* for DSAU_ stuff */
#include "keyhi.h"
#include "secder.h"
#include "secitem.h"
#include "sechash.h"

#include "sslimpl.h"
#include "sslproto.h"
#include "sslerr.h"
#include "ssl3ext.h"
#include "ssl3exthandle.h"
#include "tls13ech.h"
#include "tls13exthandle.h"
#include "tls13psk.h"
#include "tls13subcerts.h"
#include "prtime.h"
#include "prinrval.h"
#include "prerror.h"
#include "pratom.h"
#include "prthread.h"
#include "nss.h"
#include "nssoptions.h"

#include "pk11func.h"
#include "secmod.h"
#include "blapi.h"

#include <stdio.h>

static PK11SymKey *ssl3_GenerateRSAPMS(sslSocket *ss, ssl3CipherSpec *spec,
                                       PK11SlotInfo *serverKeySlot);
static SECStatus ssl3_ComputeMasterSecret(sslSocket *ss, PK11SymKey *pms,
                                          PK11SymKey **msp);
static SECStatus ssl3_DeriveConnectionKeys(sslSocket *ss,
                                           PK11SymKey *masterSecret);
static SECStatus ssl3_HandshakeFailure(sslSocket *ss);
static SECStatus ssl3_SendCertificate(sslSocket *ss);
static SECStatus ssl3_SendCertificateRequest(sslSocket *ss);
static SECStatus ssl3_SendNextProto(sslSocket *ss);
static SECStatus ssl3_SendFinished(sslSocket *ss, PRInt32 flags);
static SECStatus ssl3_SendServerHelloDone(sslSocket *ss);
static SECStatus ssl3_SendServerKeyExchange(sslSocket *ss);
static SECStatus ssl3_HandleClientHelloPart2(sslSocket *ss,
                                             SECItem *suites,
                                             sslSessionID *sid,
                                             const PRUint8 *msg,
                                             unsigned int len);
static SECStatus ssl3_HandleServerHelloPart2(sslSocket *ss,
                                             const SECItem *sidBytes,
                                             int *retErrCode);
static SECStatus ssl3_HandlePostHelloHandshakeMessage(sslSocket *ss,
                                                      PRUint8 *b,
                                                      PRUint32 length);
static SECStatus ssl3_FlushHandshakeMessages(sslSocket *ss, PRInt32 flags);
static CK_MECHANISM_TYPE ssl3_GetHashMechanismByHashType(SSLHashType hashType);
static CK_MECHANISM_TYPE ssl3_GetMgfMechanismByHashType(SSLHashType hash);
PRBool ssl_IsRsaPssSignatureScheme(SSLSignatureScheme scheme);
PRBool ssl_IsRsaeSignatureScheme(SSLSignatureScheme scheme);
PRBool ssl_IsRsaPkcs1SignatureScheme(SSLSignatureScheme scheme);
PRBool ssl_IsDsaSignatureScheme(SSLSignatureScheme scheme);
static SECStatus ssl3_UpdateDefaultHandshakeHashes(sslSocket *ss,
                                                   const unsigned char *b,
                                                   unsigned int l);
const PRUint32 kSSLSigSchemePolicy =
    NSS_USE_ALG_IN_SSL_KX | NSS_USE_ALG_IN_ANY_SIGNATURE;

const PRUint8 ssl_hello_retry_random[] = {
    0xCF, 0x21, 0xAD, 0x74, 0xE5, 0x9A, 0x61, 0x11,
    0xBE, 0x1D, 0x8C, 0x02, 0x1E, 0x65, 0xB8, 0x91,
    0xC2, 0xA2, 0x11, 0x16, 0x7A, 0xBB, 0x8C, 0x5E,
    0x07, 0x9E, 0x09, 0xE2, 0xC8, 0xA8, 0x33, 0x9C
};
PR_STATIC_ASSERT(PR_ARRAY_SIZE(ssl_hello_retry_random) == SSL3_RANDOM_LENGTH);

/* This list of SSL3 cipher suites is sorted in descending order of
 * precedence (desirability).  It only includes cipher suites we implement.
 * This table is modified by SSL3_SetPolicy(). The ordering of cipher suites
 * in this table must match the ordering in SSL_ImplementedCiphers (sslenum.c)
 *
 * Important: See bug 946147 before enabling, reordering, or adding any cipher
 * suites to this list.
 */
/* clang-format off */
static ssl3CipherSuiteCfg cipherSuites[ssl_V3_SUITES_IMPLEMENTED] = {
   /*      cipher_suite                     policy       enabled   isPresent */
 /* Special TLS 1.3 suites. */
 { TLS_AES_128_GCM_SHA256, SSL_ALLOWED, PR_TRUE, PR_FALSE },
 { TLS_CHACHA20_POLY1305_SHA256, SSL_ALLOWED, PR_TRUE, PR_FALSE },
 { TLS_AES_256_GCM_SHA384, SSL_ALLOWED, PR_TRUE, PR_FALSE },

 { TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,   SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,   SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,   SSL_ALLOWED, PR_TRUE, PR_FALSE},
   /* TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA is out of order to work around
    * bug 946147.
    */
 { TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,    SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,    SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,      SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,   SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,      SSL_ALLOWED, PR_TRUE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,        SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_RC4_128_SHA,          SSL_ALLOWED, PR_FALSE, PR_FALSE},

 { TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,     SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,SSL_ALLOWED,PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,     SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_256_GCM_SHA384,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_AES_128_CBC_SHA,        SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_128_CBC_SHA,        SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,     SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_AES_256_CBC_SHA,        SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_256_CBC_SHA,        SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,     SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA,   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,       SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,       SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_DHE_DSS_WITH_RC4_128_SHA,            SSL_ALLOWED, PR_FALSE, PR_FALSE},

 { TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,       SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,     SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,       SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,    SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,      SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_ECDSA_WITH_RC4_128_SHA,         SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_RSA_WITH_RC4_128_SHA,           SSL_ALLOWED, PR_FALSE, PR_FALSE},

 /* RSA */
 { TLS_RSA_WITH_AES_128_GCM_SHA256,         SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_AES_256_GCM_SHA384,         SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_AES_128_CBC_SHA,            SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_AES_128_CBC_SHA256,         SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,       SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_AES_256_CBC_SHA,            SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_AES_256_CBC_SHA256,         SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,       SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_SEED_CBC_SHA,               SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_3DES_EDE_CBC_SHA,           SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_RC4_128_SHA,                SSL_ALLOWED, PR_TRUE,  PR_FALSE},
 { TLS_RSA_WITH_RC4_128_MD5,                SSL_ALLOWED, PR_TRUE,  PR_FALSE},

 /* 56-bit DES "domestic" cipher suites */
 { TLS_DHE_RSA_WITH_DES_CBC_SHA,            SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_DHE_DSS_WITH_DES_CBC_SHA,            SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_DES_CBC_SHA,                SSL_ALLOWED, PR_FALSE, PR_FALSE},

 /* ciphersuites with no encryption */
 { TLS_ECDHE_ECDSA_WITH_NULL_SHA,           SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDHE_RSA_WITH_NULL_SHA,             SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_RSA_WITH_NULL_SHA,              SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_ECDH_ECDSA_WITH_NULL_SHA,            SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_NULL_SHA,                   SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_NULL_SHA256,                SSL_ALLOWED, PR_FALSE, PR_FALSE},
 { TLS_RSA_WITH_NULL_MD5,                   SSL_ALLOWED, PR_FALSE, PR_FALSE},
};
/* clang-format on */

/* This is the default supported set of signature schemes.  The order of the
 * hashes here is all that is important, since that will (sometimes) determine
 * which hash we use.  The key pair (i.e., cert) is the primary thing that
 * determines what we use and this doesn't affect how we select key pairs.  The
 * order of signature types is based on the same rules for ordering we use for
 * cipher suites just for consistency.
 */
static const SSLSignatureScheme defaultSignatureSchemes[] = {
    ssl_sig_ecdsa_secp256r1_sha256,
    ssl_sig_ecdsa_secp384r1_sha384,
    ssl_sig_ecdsa_secp521r1_sha512,
    ssl_sig_ecdsa_sha1,
    ssl_sig_rsa_pss_rsae_sha256,
    ssl_sig_rsa_pss_rsae_sha384,
    ssl_sig_rsa_pss_rsae_sha512,
    ssl_sig_rsa_pkcs1_sha256,
    ssl_sig_rsa_pkcs1_sha384,
    ssl_sig_rsa_pkcs1_sha512,
    ssl_sig_rsa_pkcs1_sha1,
    ssl_sig_dsa_sha256,
    ssl_sig_dsa_sha384,
    ssl_sig_dsa_sha512,
    ssl_sig_dsa_sha1
};
PR_STATIC_ASSERT(PR_ARRAY_SIZE(defaultSignatureSchemes) <=
                 MAX_SIGNATURE_SCHEMES);

/* Verify that SSL_ImplementedCiphers and cipherSuites are in consistent order.
 */
#ifdef DEBUG
void
ssl3_CheckCipherSuiteOrderConsistency()
{
    unsigned int i;

    PORT_Assert(SSL_NumImplementedCiphers == PR_ARRAY_SIZE(cipherSuites));

    for (i = 0; i < PR_ARRAY_SIZE(cipherSuites); ++i) {
        PORT_Assert(SSL_ImplementedCiphers[i] == cipherSuites[i].cipher_suite);
    }
}
#endif

static const /*SSL3ClientCertificateType */ PRUint8 certificate_types[] = {
    ct_RSA_sign,
    ct_ECDSA_sign,
    ct_DSS_sign,
};

static SSL3Statistics ssl3stats;

static const ssl3KEADef kea_defs[] = {
    /* indexed by SSL3KeyExchangeAlgorithm */
    /* kea            exchKeyType signKeyType authKeyType ephemeral  oid */
    { kea_null, ssl_kea_null, nullKey, ssl_auth_null, PR_FALSE, 0 },
    { kea_rsa, ssl_kea_rsa, nullKey, ssl_auth_rsa_decrypt, PR_FALSE, SEC_OID_TLS_RSA },
    { kea_dh_dss, ssl_kea_dh, dsaKey, ssl_auth_dsa, PR_FALSE, SEC_OID_TLS_DH_DSS },
    { kea_dh_rsa, ssl_kea_dh, rsaKey, ssl_auth_rsa_sign, PR_FALSE, SEC_OID_TLS_DH_RSA },
    { kea_dhe_dss, ssl_kea_dh, dsaKey, ssl_auth_dsa, PR_TRUE, SEC_OID_TLS_DHE_DSS },
    { kea_dhe_rsa, ssl_kea_dh, rsaKey, ssl_auth_rsa_sign, PR_TRUE, SEC_OID_TLS_DHE_RSA },
    { kea_dh_anon, ssl_kea_dh, nullKey, ssl_auth_null, PR_TRUE, SEC_OID_TLS_DH_ANON },
    { kea_ecdh_ecdsa, ssl_kea_ecdh, nullKey, ssl_auth_ecdh_ecdsa, PR_FALSE, SEC_OID_TLS_ECDH_ECDSA },
    { kea_ecdhe_ecdsa, ssl_kea_ecdh, ecKey, ssl_auth_ecdsa, PR_TRUE, SEC_OID_TLS_ECDHE_ECDSA },
    { kea_ecdh_rsa, ssl_kea_ecdh, nullKey, ssl_auth_ecdh_rsa, PR_FALSE, SEC_OID_TLS_ECDH_RSA },
    { kea_ecdhe_rsa, ssl_kea_ecdh, rsaKey, ssl_auth_rsa_sign, PR_TRUE, SEC_OID_TLS_ECDHE_RSA },
    { kea_ecdh_anon, ssl_kea_ecdh, nullKey, ssl_auth_null, PR_TRUE, SEC_OID_TLS_ECDH_ANON },
    { kea_ecdhe_psk, ssl_kea_ecdh_psk, nullKey, ssl_auth_psk, PR_TRUE, SEC_OID_TLS_ECDHE_PSK },
    { kea_dhe_psk, ssl_kea_dh_psk, nullKey, ssl_auth_psk, PR_TRUE, SEC_OID_TLS_DHE_PSK },
    { kea_tls13_any, ssl_kea_tls13_any, nullKey, ssl_auth_tls13_any, PR_TRUE, SEC_OID_TLS13_KEA_ANY },
};

/* must use ssl_LookupCipherSuiteDef to access */
static const ssl3CipherSuiteDef cipher_suite_defs[] = {
    /*  cipher_suite                    bulk_cipher_alg mac_alg key_exchange_alg prf_hash */
    /*  Note that the prf_hash_alg is the hash function used by the PRF, see sslimpl.h.  */

    { TLS_NULL_WITH_NULL_NULL, cipher_null, ssl_mac_null, kea_null, ssl_hash_none },
    { TLS_RSA_WITH_NULL_MD5, cipher_null, ssl_mac_md5, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_NULL_SHA, cipher_null, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_NULL_SHA256, cipher_null, ssl_hmac_sha256, kea_rsa, ssl_hash_sha256 },
    { TLS_RSA_WITH_RC4_128_MD5, cipher_rc4, ssl_mac_md5, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_DES_CBC_SHA, cipher_des, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_3DES_EDE_CBC_SHA, cipher_3des, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_DHE_DSS_WITH_DES_CBC_SHA, cipher_des, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
      cipher_3des, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_DSS_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_RSA_WITH_DES_CBC_SHA, cipher_des, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },
    { TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
      cipher_3des, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },

    /* New TLS cipher suites */
    { TLS_RSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_AES_128_CBC_SHA256, cipher_aes_128, ssl_hmac_sha256, kea_rsa, ssl_hash_sha256 },
    { TLS_DHE_DSS_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_RSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },
    { TLS_DHE_RSA_WITH_AES_128_CBC_SHA256, cipher_aes_128, ssl_hmac_sha256, kea_dhe_rsa, ssl_hash_sha256 },
    { TLS_RSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_RSA_WITH_AES_256_CBC_SHA256, cipher_aes_256, ssl_hmac_sha256, kea_rsa, ssl_hash_sha256 },
    { TLS_DHE_DSS_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_RSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },
    { TLS_DHE_RSA_WITH_AES_256_CBC_SHA256, cipher_aes_256, ssl_hmac_sha256, kea_dhe_rsa, ssl_hash_sha256 },
    { TLS_DHE_RSA_WITH_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_dhe_rsa, ssl_hash_sha384 },

    { TLS_RSA_WITH_SEED_CBC_SHA, cipher_seed, ssl_mac_sha, kea_rsa, ssl_hash_none },

    { TLS_RSA_WITH_CAMELLIA_128_CBC_SHA, cipher_camellia_128, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA,
      cipher_camellia_128, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,
      cipher_camellia_128, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },
    { TLS_RSA_WITH_CAMELLIA_256_CBC_SHA, cipher_camellia_256, ssl_mac_sha, kea_rsa, ssl_hash_none },
    { TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA,
      cipher_camellia_256, ssl_mac_sha, kea_dhe_dss, ssl_hash_none },
    { TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
      cipher_camellia_256, ssl_mac_sha, kea_dhe_rsa, ssl_hash_none },

    { TLS_DHE_RSA_WITH_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_dhe_rsa, ssl_hash_sha256 },
    { TLS_RSA_WITH_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_rsa, ssl_hash_sha256 },

    { TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_ecdhe_rsa, ssl_hash_sha256 },
    { TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_ecdhe_ecdsa, ssl_hash_sha256 },
    { TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_ecdhe_ecdsa, ssl_hash_sha384 },
    { TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_ecdhe_rsa, ssl_hash_sha384 },
    { TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384, cipher_aes_256, ssl_hmac_sha384, kea_ecdhe_ecdsa, ssl_hash_sha384 },
    { TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, cipher_aes_256, ssl_hmac_sha384, kea_ecdhe_rsa, ssl_hash_sha384 },
    { TLS_DHE_DSS_WITH_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_dhe_dss, ssl_hash_sha256 },
    { TLS_DHE_DSS_WITH_AES_128_CBC_SHA256, cipher_aes_128, ssl_hmac_sha256, kea_dhe_dss, ssl_hash_sha256 },
    { TLS_DHE_DSS_WITH_AES_256_CBC_SHA256, cipher_aes_256, ssl_hmac_sha256, kea_dhe_dss, ssl_hash_sha256 },
    { TLS_DHE_DSS_WITH_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_dhe_dss, ssl_hash_sha384 },
    { TLS_RSA_WITH_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_rsa, ssl_hash_sha384 },

    { TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256, cipher_chacha20, ssl_mac_aead, kea_dhe_rsa, ssl_hash_sha256 },

    { TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, cipher_chacha20, ssl_mac_aead, kea_ecdhe_rsa, ssl_hash_sha256 },
    { TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, cipher_chacha20, ssl_mac_aead, kea_ecdhe_ecdsa, ssl_hash_sha256 },

    { TLS_ECDH_ECDSA_WITH_NULL_SHA, cipher_null, ssl_mac_sha, kea_ecdh_ecdsa, ssl_hash_none },
    { TLS_ECDH_ECDSA_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_ecdh_ecdsa, ssl_hash_none },
    { TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA, cipher_3des, ssl_mac_sha, kea_ecdh_ecdsa, ssl_hash_none },
    { TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_ecdh_ecdsa, ssl_hash_none },
    { TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_ecdh_ecdsa, ssl_hash_none },

    { TLS_ECDHE_ECDSA_WITH_NULL_SHA, cipher_null, ssl_mac_sha, kea_ecdhe_ecdsa, ssl_hash_none },
    { TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_ecdhe_ecdsa, ssl_hash_none },
    { TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA, cipher_3des, ssl_mac_sha, kea_ecdhe_ecdsa, ssl_hash_none },
    { TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_ecdhe_ecdsa, ssl_hash_none },
    { TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, cipher_aes_128, ssl_hmac_sha256, kea_ecdhe_ecdsa, ssl_hash_sha256 },
    { TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_ecdhe_ecdsa, ssl_hash_none },

    { TLS_ECDH_RSA_WITH_NULL_SHA, cipher_null, ssl_mac_sha, kea_ecdh_rsa, ssl_hash_none },
    { TLS_ECDH_RSA_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_ecdh_rsa, ssl_hash_none },
    { TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA, cipher_3des, ssl_mac_sha, kea_ecdh_rsa, ssl_hash_none },
    { TLS_ECDH_RSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_ecdh_rsa, ssl_hash_none },
    { TLS_ECDH_RSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_ecdh_rsa, ssl_hash_none },

    { TLS_ECDHE_RSA_WITH_NULL_SHA, cipher_null, ssl_mac_sha, kea_ecdhe_rsa, ssl_hash_none },
    { TLS_ECDHE_RSA_WITH_RC4_128_SHA, cipher_rc4, ssl_mac_sha, kea_ecdhe_rsa, ssl_hash_none },
    { TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, cipher_3des, ssl_mac_sha, kea_ecdhe_rsa, ssl_hash_none },
    { TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, cipher_aes_128, ssl_mac_sha, kea_ecdhe_rsa, ssl_hash_none },
    { TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, cipher_aes_128, ssl_hmac_sha256, kea_ecdhe_rsa, ssl_hash_sha256 },
    { TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, cipher_aes_256, ssl_mac_sha, kea_ecdhe_rsa, ssl_hash_none },

    { TLS_AES_128_GCM_SHA256, cipher_aes_128_gcm, ssl_mac_aead, kea_tls13_any, ssl_hash_sha256 },
    { TLS_CHACHA20_POLY1305_SHA256, cipher_chacha20, ssl_mac_aead, kea_tls13_any, ssl_hash_sha256 },
    { TLS_AES_256_GCM_SHA384, cipher_aes_256_gcm, ssl_mac_aead, kea_tls13_any, ssl_hash_sha384 },
};

static const CK_MECHANISM_TYPE auth_alg_defs[] = {
    CKM_INVALID_MECHANISM, /* ssl_auth_null */
    CKM_RSA_PKCS,          /* ssl_auth_rsa_decrypt */
    CKM_DSA, /* ? _SHA1 */ /* ssl_auth_dsa */
    CKM_INVALID_MECHANISM, /* ssl_auth_kea (unused) */
    CKM_ECDSA,             /* ssl_auth_ecdsa */
    CKM_ECDH1_DERIVE,      /* ssl_auth_ecdh_rsa */
    CKM_ECDH1_DERIVE,      /* ssl_auth_ecdh_ecdsa */
    CKM_RSA_PKCS,          /* ssl_auth_rsa_sign */
    CKM_RSA_PKCS_PSS,      /* ssl_auth_rsa_pss */
    CKM_NSS_HKDF_SHA256,   /* ssl_auth_psk (just check for HKDF) */
    CKM_INVALID_MECHANISM  /* ssl_auth_tls13_any */
};
PR_STATIC_ASSERT(PR_ARRAY_SIZE(auth_alg_defs) == ssl_auth_size);

static const CK_MECHANISM_TYPE kea_alg_defs[] = {
    CKM_INVALID_MECHANISM, /* ssl_kea_null */
    CKM_RSA_PKCS,          /* ssl_kea_rsa */
    CKM_DH_PKCS_DERIVE,    /* ssl_kea_dh */
    CKM_INVALID_MECHANISM, /* ssl_kea_fortezza (unused) */
    CKM_ECDH1_DERIVE,      /* ssl_kea_ecdh */
    CKM_ECDH1_DERIVE,      /* ssl_kea_ecdh_psk */
    CKM_DH_PKCS_DERIVE,    /* ssl_kea_dh_psk */
    CKM_INVALID_MECHANISM, /* ssl_kea_tls13_any */
};
PR_STATIC_ASSERT(PR_ARRAY_SIZE(kea_alg_defs) == ssl_kea_size);

typedef struct SSLCipher2MechStr {
    SSLCipherAlgorithm calg;
    CK_MECHANISM_TYPE cmech;
} SSLCipher2Mech;

/* indexed by type SSLCipherAlgorithm */
static const SSLCipher2Mech alg2Mech[] = {
    /* calg,          cmech  */
    { ssl_calg_null, CKM_INVALID_MECHANISM },
    { ssl_calg_rc4, CKM_RC4 },
    { ssl_calg_rc2, CKM_RC2_CBC },
    { ssl_calg_des, CKM_DES_CBC },
    { ssl_calg_3des, CKM_DES3_CBC },
    { ssl_calg_idea, CKM_IDEA_CBC },
    { ssl_calg_fortezza, CKM_SKIPJACK_CBC64 },
    { ssl_calg_aes, CKM_AES_CBC },
    { ssl_calg_camellia, CKM_CAMELLIA_CBC },
    { ssl_calg_seed, CKM_SEED_CBC },
    { ssl_calg_aes_gcm, CKM_AES_GCM },
    { ssl_calg_chacha20, CKM_CHACHA20_POLY1305 },
};

const PRUint8 tls12_downgrade_random[] = { 0x44, 0x4F, 0x57, 0x4E,
                                           0x47, 0x52, 0x44, 0x01 };
const PRUint8 tls1_downgrade_random[] = { 0x44, 0x4F, 0x57, 0x4E,
                                          0x47, 0x52, 0x44, 0x00 };
PR_STATIC_ASSERT(sizeof(tls12_downgrade_random) ==
                 sizeof(tls1_downgrade_random));

/* The ECCWrappedKeyInfo structure defines how various pieces of
 * information are laid out within wrappedSymmetricWrappingkey
 * for ECDH key exchange. Since wrappedSymmetricWrappingkey is
 * a 512-byte buffer (see sslimpl.h), the variable length field
 * in ECCWrappedKeyInfo can be at most (512 - 8) = 504 bytes.
 *
 * XXX For now, NSS only supports named elliptic curves of size 571 bits
 * or smaller. The public value will fit within 145 bytes and EC params
 * will fit within 12 bytes. We'll need to revisit this when NSS
 * supports arbitrary curves.
 */
#define MAX_EC_WRAPPED_KEY_BUFLEN 504

typedef struct ECCWrappedKeyInfoStr {
    PRUint16 size;                          /* EC public key size in bits */
    PRUint16 encodedParamLen;               /* length (in bytes) of DER encoded EC params */
    PRUint16 pubValueLen;                   /* length (in bytes) of EC public value */
    PRUint16 wrappedKeyLen;                 /* length (in bytes) of the wrapped key */
    PRUint8 var[MAX_EC_WRAPPED_KEY_BUFLEN]; /* this buffer contains the */
    /* EC public-key params, the EC public value and the wrapped key  */
} ECCWrappedKeyInfo;

CK_MECHANISM_TYPE
ssl3_Alg2Mech(SSLCipherAlgorithm calg)
{
    PORT_Assert(alg2Mech[calg].calg == calg);
    return alg2Mech[calg].cmech;
}

#if defined(TRACE)

static char *
ssl3_DecodeHandshakeType(int msgType)
{
    char *rv;
    static char line[40];

    switch (msgType) {
        case ssl_hs_hello_request:
            rv = "hello_request (0)";
            break;
        case ssl_hs_client_hello:
            rv = "client_hello  (1)";
            break;
        case ssl_hs_server_hello:
            rv = "server_hello  (2)";
            break;
        case ssl_hs_hello_verify_request:
            rv = "hello_verify_request (3)";
            break;
        case ssl_hs_new_session_ticket:
            rv = "new_session_ticket (4)";
            break;
        case ssl_hs_end_of_early_data:
            rv = "end_of_early_data (5)";
            break;
        case ssl_hs_hello_retry_request:
            rv = "hello_retry_request (6)";
            break;
        case ssl_hs_encrypted_extensions:
            rv = "encrypted_extensions (8)";
            break;
        case ssl_hs_certificate:
            rv = "certificate  (11)";
            break;
        case ssl_hs_server_key_exchange:
            rv = "server_key_exchange (12)";
            break;
        case ssl_hs_certificate_request:
            rv = "certificate_request (13)";
            break;
        case ssl_hs_server_hello_done:
            rv = "server_hello_done   (14)";
            break;
        case ssl_hs_certificate_verify:
            rv = "certificate_verify  (15)";
            break;
        case ssl_hs_client_key_exchange:
            rv = "client_key_exchange (16)";
            break;
        case ssl_hs_finished:
            rv = "finished     (20)";
            break;
        case ssl_hs_certificate_status:
            rv = "certificate_status  (22)";
            break;
        case ssl_hs_key_update:
            rv = "key_update   (24)";
            break;
        default:
            snprintf(line, sizeof(line), "*UNKNOWN* handshake type! (%d)", msgType);
            rv = line;
    }
    return rv;
}

static char *
ssl3_DecodeContentType(int msgType)
{
    char *rv;
    static char line[40];

    switch (msgType) {
        case ssl_ct_change_cipher_spec:
            rv = "change_cipher_spec (20)";
            break;
        case ssl_ct_alert:
            rv = "alert      (21)";
            break;
        case ssl_ct_handshake:
            rv = "handshake  (22)";
            break;
        case ssl_ct_application_data:
            rv = "application_data (23)";
            break;
        case ssl_ct_ack:
            rv = "ack (26)";
            break;
        default:
            snprintf(line, sizeof(line), "*UNKNOWN* record type! (%d)", msgType);
            rv = line;
    }
    return rv;
}

#endif

SSL3Statistics *
SSL_GetStatistics(void)
{
    return &ssl3stats;
}

typedef struct tooLongStr {
#if defined(IS_LITTLE_ENDIAN)
    PRInt32 low;
    PRInt32 high;
#else
    PRInt32 high;
    PRInt32 low;
#endif
} tooLong;

void
SSL_AtomicIncrementLong(long *x)
{
    if ((sizeof *x) == sizeof(PRInt32)) {
        PR_ATOMIC_INCREMENT((PRInt32 *)x);
    } else {
        tooLong *tl = (tooLong *)x;
        if (PR_ATOMIC_INCREMENT(&tl->low) == 0)
            PR_ATOMIC_INCREMENT(&tl->high);
    }
}

PRBool
ssl3_CipherSuiteAllowedForVersionRange(ssl3CipherSuite cipherSuite,
                                       const SSLVersionRange *vrange)
{
    switch (cipherSuite) {
        case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
        case TLS_RSA_WITH_AES_256_CBC_SHA256:
        case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256:
        case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384:
        case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
        case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384:
        case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
        case TLS_RSA_WITH_AES_128_CBC_SHA256:
        case TLS_RSA_WITH_AES_128_GCM_SHA256:
        case TLS_RSA_WITH_AES_256_GCM_SHA384:
        case TLS_DHE_DSS_WITH_AES_128_CBC_SHA256:
        case TLS_DHE_DSS_WITH_AES_256_CBC_SHA256:
        case TLS_RSA_WITH_NULL_SHA256:
        case TLS_DHE_DSS_WITH_AES_128_GCM_SHA256:
        case TLS_DHE_DSS_WITH_AES_256_GCM_SHA384:
        case TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
        case TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384:
        case TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
        case TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:
        case TLS_DHE_RSA_WITH_AES_128_GCM_SHA256:
        case TLS_DHE_RSA_WITH_AES_256_GCM_SHA384:
        case TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256:
        case TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:
        case TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256:
            return vrange->max >= SSL_LIBRARY_VERSION_TLS_1_2 &&
                   vrange->min < SSL_LIBRARY_VERSION_TLS_1_3;

        /* RFC 4492: ECC cipher suites need TLS extensions to negotiate curves and
         * point formats.*/
        case TLS_ECDH_ECDSA_WITH_NULL_SHA:
        case TLS_ECDH_ECDSA_WITH_RC4_128_SHA:
        case TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA:
        case TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA:
        case TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA:
        case TLS_ECDHE_ECDSA_WITH_NULL_SHA:
        case TLS_ECDHE_ECDSA_WITH_RC4_128_SHA:
        case TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA:
        case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA:
        case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA:
        case TLS_ECDH_RSA_WITH_NULL_SHA:
        case TLS_ECDH_RSA_WITH_RC4_128_SHA:
        case TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA:
        case TLS_ECDH_RSA_WITH_AES_128_CBC_SHA:
        case TLS_ECDH_RSA_WITH_AES_256_CBC_SHA:
        case TLS_ECDHE_RSA_WITH_NULL_SHA:
        case TLS_ECDHE_RSA_WITH_RC4_128_SHA:
        case TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA:
        case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:
        case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
            return vrange->max >= SSL_LIBRARY_VERSION_TLS_1_0 &&
                   vrange->min < SSL_LIBRARY_VERSION_TLS_1_3;

        case TLS_AES_128_GCM_SHA256:
        case TLS_AES_256_GCM_SHA384:
        case TLS_CHACHA20_POLY1305_SHA256:
            return vrange->max >= SSL_LIBRARY_VERSION_TLS_1_3;

        default:
            return vrange->min < SSL_LIBRARY_VERSION_TLS_1_3;
    }
}

/* return pointer to ssl3CipherSuiteDef for suite, or NULL */
/* XXX This does a linear search.  A binary search would be better. */
const ssl3CipherSuiteDef *
ssl_LookupCipherSuiteDef(ssl3CipherSuite suite)
{
    int cipher_suite_def_len =
        sizeof(cipher_suite_defs) / sizeof(cipher_suite_defs[0]);
    int i;

    for (i = 0; i < cipher_suite_def_len; i++) {
        if (cipher_suite_defs[i].cipher_suite == suite)
            return &cipher_suite_defs[i];
    }
    PORT_Assert(PR_FALSE); /* We should never get here. */
    PORT_SetError(SSL_ERROR_UNKNOWN_CIPHER_SUITE);
    return NULL;
}

/* Find the cipher configuration struct associate with suite */
/* XXX This does a linear search.  A binary search would be better. */
static ssl3CipherSuiteCfg *
ssl_LookupCipherSuiteCfgMutable(ssl3CipherSuite suite,
                                ssl3CipherSuiteCfg *suites)
{
    int i;

    for (i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        if (suites[i].cipher_suite == suite)
            return &suites[i];
    }
    /* return NULL and let the caller handle it.  */
    PORT_SetError(SSL_ERROR_UNKNOWN_CIPHER_SUITE);
    return NULL;
}

const ssl3CipherSuiteCfg *
ssl_LookupCipherSuiteCfg(ssl3CipherSuite suite, const ssl3CipherSuiteCfg *suites)
{
    return ssl_LookupCipherSuiteCfgMutable(suite,
                                           CONST_CAST(ssl3CipherSuiteCfg, suites));
}

static PRBool
ssl_NamedGroupTypeEnabled(const sslSocket *ss, SSLKEAType keaType)
{
    unsigned int i;
    for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
        if (ss->namedGroupPreferences[i] &&
            ss->namedGroupPreferences[i]->keaType == keaType) {
            return PR_TRUE;
        }
    }
    return PR_FALSE;
}

static PRBool
ssl_KEAEnabled(const sslSocket *ss, SSLKEAType keaType)
{
    switch (keaType) {
        case ssl_kea_rsa:
            return PR_TRUE;

        case ssl_kea_dh:
        case ssl_kea_dh_psk: {
            if (ss->sec.isServer && !ss->opt.enableServerDhe) {
                return PR_FALSE;
            }

            if (ss->sec.isServer) {
                /* If the server requires named FFDHE groups, then the client
                 * must have included an FFDHE group. peerSupportsFfdheGroups
                 * is set to true in ssl_HandleSupportedGroupsXtn(). */
                if (ss->opt.requireDHENamedGroups &&
                    !ss->xtnData.peerSupportsFfdheGroups) {
                    return PR_FALSE;
                }

                /* We can use the weak DH group if all of these are true:
                 * 1. We don't require named groups.
                 * 2. The peer doesn't support named groups.
                 * 3. This isn't TLS 1.3.
                 * 4. The weak group is enabled. */
                if (!ss->opt.requireDHENamedGroups &&
                    !ss->xtnData.peerSupportsFfdheGroups &&
                    ss->version < SSL_LIBRARY_VERSION_TLS_1_3 &&
                    ss->ssl3.dheWeakGroupEnabled) {
                    return PR_TRUE;
                }
            } else {
                if (ss->vrange.min < SSL_LIBRARY_VERSION_TLS_1_3 &&
                    !ss->opt.requireDHENamedGroups) {
                    /* The client enables DHE cipher suites even if no DHE groups
                     * are enabled. Only if this isn't TLS 1.3 and named groups
                     * are not required. */
                    return PR_TRUE;
                }
            }
            return ssl_NamedGroupTypeEnabled(ss, ssl_kea_dh);
        }

        case ssl_kea_ecdh:
        case ssl_kea_ecdh_psk:
            return ssl_NamedGroupTypeEnabled(ss, ssl_kea_ecdh);

        case ssl_kea_tls13_any:
            return PR_TRUE;

        case ssl_kea_fortezza:
        default:
            PORT_Assert(0);
    }
    return PR_FALSE;
}

static PRBool
ssl_HasCert(const sslSocket *ss, PRUint16 maxVersion, SSLAuthType authType)
{
    PRCList *cursor;
    if (authType == ssl_auth_null || authType == ssl_auth_psk || authType == ssl_auth_tls13_any) {
        return PR_TRUE;
    }
    for (cursor = PR_NEXT_LINK(&ss->serverCerts);
         cursor != &ss->serverCerts;
         cursor = PR_NEXT_LINK(cursor)) {
        sslServerCert *cert = (sslServerCert *)cursor;
        if (!cert->serverKeyPair ||
            !cert->serverKeyPair->privKey ||
            !cert->serverCertChain ||
            !SSL_CERT_IS(cert, authType)) {
            continue;
        }
        /* When called from ssl3_config_match_init(), all the EC curves will be
         * enabled, so this will essentially do nothing (unless we implement
         * curve configuration).  However, once we have seen the
         * supported_groups extension and this is called from config_match(),
         * this will filter out certificates with an unsupported curve.
         *
         * If we might negotiate TLS 1.3, skip this test as group configuration
         * doesn't affect choices in TLS 1.3.
         */
        if (maxVersion < SSL_LIBRARY_VERSION_TLS_1_3 &&
            (authType == ssl_auth_ecdsa ||
             authType == ssl_auth_ecdh_ecdsa ||
             authType == ssl_auth_ecdh_rsa) &&
            !ssl_NamedGroupEnabled(ss, cert->namedCurve)) {
            continue;
        }
        return PR_TRUE;
    }
    if (authType == ssl_auth_rsa_sign) {
        return ssl_HasCert(ss, maxVersion, ssl_auth_rsa_pss);
    }
    return PR_FALSE;
}

/* return true if the scheme is allowed by policy, This prevents
 * failures later when our actual signatures are rejected by
 * policy by either ssl code, or lower level NSS code */
static PRBool
ssl_SchemePolicyOK(SSLSignatureScheme scheme, PRUint32 require)
{
    /* Hash policy. */
    PRUint32 policy;
    SECOidTag hashOID = ssl3_HashTypeToOID(ssl_SignatureSchemeToHashType(scheme));
    SECOidTag sigOID;

    /* policy bits needed to enable a SignatureScheme */
    SECStatus rv = NSS_GetAlgorithmPolicy(hashOID, &policy);
    if (rv == SECSuccess &&
        (policy & require) != require) {
        return PR_FALSE;
    }

    /* ssl_SignatureSchemeToAuthType reports rsa for rsa_pss_rsae, but we
     * actually implement pss signatures when we sign, so just use RSA_PSS
     * for all RSA PSS Siganture schemes */
    if (ssl_IsRsaPssSignatureScheme(scheme)) {
        sigOID = SEC_OID_PKCS1_RSA_PSS_SIGNATURE;
    } else {
        sigOID = ssl3_AuthTypeToOID(ssl_SignatureSchemeToAuthType(scheme));
    }
    /* Signature Policy. */
    rv = NSS_GetAlgorithmPolicy(sigOID, &policy);
    if (rv == SECSuccess &&
        (policy & require) != require) {
        return PR_FALSE;
    }
    return PR_TRUE;
}

/* Check that a signature scheme is accepted.
 * Both by policy and by having a token that supports it. */
static PRBool
ssl_SignatureSchemeAccepted(PRUint16 minVersion,
                            SSLSignatureScheme scheme,
                            PRBool forCert)
{
    /* Disable RSA-PSS schemes if there are no tokens to verify them. */
    if (ssl_IsRsaPssSignatureScheme(scheme)) {
        if (!PK11_TokenExists(auth_alg_defs[ssl_auth_rsa_pss])) {
            return PR_FALSE;
        }
    } else if (!forCert && ssl_IsRsaPkcs1SignatureScheme(scheme)) {
        /* Disable PKCS#1 signatures if we are limited to TLS 1.3.
         * We still need to advertise PKCS#1 signatures in CH and CR
         * for certificate signatures.
         */
        if (minVersion >= SSL_LIBRARY_VERSION_TLS_1_3) {
            return PR_FALSE;
        }
    } else if (ssl_IsDsaSignatureScheme(scheme)) {
        /* DSA: not in TLS 1.3, and check policy. */
        if (minVersion >= SSL_LIBRARY_VERSION_TLS_1_3) {
            return PR_FALSE;
        }
    }

    return ssl_SchemePolicyOK(scheme, kSSLSigSchemePolicy);
}

static SECStatus
ssl_CheckSignatureSchemes(sslSocket *ss)
{
    if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_2) {
        return SECSuccess;
    }

    /* If this is a server using TLS 1.3, we just need to have one signature
     * scheme for which we have a usable certificate.
     *
     * Note: Certificates for earlier TLS versions are checked along with the
     * cipher suite in ssl3_config_match_init. */
    if (ss->sec.isServer && ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3) {
        PRBool foundCert = PR_FALSE;
        for (unsigned int i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
            SSLAuthType authType =
                ssl_SignatureSchemeToAuthType(ss->ssl3.signatureSchemes[i]);
            if (ssl_HasCert(ss, ss->vrange.max, authType)) {
                foundCert = PR_TRUE;
                break;
            }
        }
        if (!foundCert) {
            PORT_SetError(SSL_ERROR_NO_SUPPORTED_SIGNATURE_ALGORITHM);
            return SECFailure;
        }
    }

    /* Ensure that there is a signature scheme that can be accepted.*/
    for (unsigned int i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        if (ssl_SignatureSchemeAccepted(ss->vrange.min,
                                        ss->ssl3.signatureSchemes[i],
                                        PR_FALSE /* forCert */)) {
            return SECSuccess;
        }
    }
    PORT_SetError(SSL_ERROR_NO_SUPPORTED_SIGNATURE_ALGORITHM);
    return SECFailure;
}

/* For a server, check that a signature scheme that can be used with the
 * provided authType is both enabled and usable. */
static PRBool
ssl_HasSignatureScheme(const sslSocket *ss, SSLAuthType authType)
{
    PORT_Assert(ss->sec.isServer);
    PORT_Assert(ss->ssl3.hs.preliminaryInfo & ssl_preinfo_version);
    PORT_Assert(authType != ssl_auth_null);
    PORT_Assert(authType != ssl_auth_tls13_any);
    if (ss->version < SSL_LIBRARY_VERSION_TLS_1_2 ||
        authType == ssl_auth_rsa_decrypt ||
        authType == ssl_auth_ecdh_rsa ||
        authType == ssl_auth_ecdh_ecdsa) {
        return PR_TRUE;
    }
    for (unsigned int i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        SSLSignatureScheme scheme = ss->ssl3.signatureSchemes[i];
        SSLAuthType schemeAuthType = ssl_SignatureSchemeToAuthType(scheme);
        PRBool acceptable = authType == schemeAuthType ||
                            (schemeAuthType == ssl_auth_rsa_pss &&
                             authType == ssl_auth_rsa_sign);
        if (acceptable && ssl_SignatureSchemeAccepted(ss->version, scheme, PR_FALSE /* forCert */)) {
            return PR_TRUE;
        }
    }
    return PR_FALSE;
}

/* Initialize the suite->isPresent value for config_match
 * Returns count of enabled ciphers supported by extant tokens,
 * regardless of policy or user preference.
 * If this returns zero, the user cannot do SSL v3.
 */
unsigned int
ssl3_config_match_init(sslSocket *ss)
{
    ssl3CipherSuiteCfg *suite;
    const ssl3CipherSuiteDef *cipher_def;
    SSLCipherAlgorithm cipher_alg;
    CK_MECHANISM_TYPE cipher_mech;
    SSLAuthType authType;
    SSLKEAType keaType;
    unsigned int i;
    unsigned int numPresent = 0;
    unsigned int numEnabled = 0;

    PORT_Assert(ss);
    if (!ss) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return 0;
    }
    if (SSL_ALL_VERSIONS_DISABLED(&ss->vrange)) {
        return 0;
    }
    if (ss->sec.isServer && ss->psk &&
        PR_CLIST_IS_EMPTY(&ss->serverCerts) &&
        (ss->opt.requestCertificate || ss->opt.requireCertificate)) {
        /* PSK and certificate auth cannot be combined. */
        PORT_SetError(SSL_ERROR_NO_CERTIFICATE);
        return 0;
    }
    if (ssl_CheckSignatureSchemes(ss) != SECSuccess) {
        return 0; /* Code already set. */
    }

    ssl_FilterSupportedGroups(ss);
    for (i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        suite = &ss->cipherSuites[i];
        if (suite->enabled) {
            ++numEnabled;
            /* We need the cipher defs to see if we have a token that can handle
             * this cipher.  It isn't part of the static definition.
             */
            cipher_def = ssl_LookupCipherSuiteDef(suite->cipher_suite);
            if (!cipher_def) {
                suite->isPresent = PR_FALSE;
                continue;
            }
            cipher_alg = ssl_GetBulkCipherDef(cipher_def)->calg;
            cipher_mech = ssl3_Alg2Mech(cipher_alg);

            /* Mark the suites that are backed by real tokens, certs and keys */
            suite->isPresent = PR_TRUE;

            authType = kea_defs[cipher_def->key_exchange_alg].authKeyType;
            if (authType != ssl_auth_null && authType != ssl_auth_tls13_any) {
                if (ss->sec.isServer &&
                    !(ssl_HasCert(ss, ss->vrange.max, authType) &&
                      ssl_HasSignatureScheme(ss, authType))) {
                    suite->isPresent = PR_FALSE;
                } else if (!PK11_TokenExists(auth_alg_defs[authType])) {
                    suite->isPresent = PR_FALSE;
                }
            }

            keaType = kea_defs[cipher_def->key_exchange_alg].exchKeyType;
            if (keaType != ssl_kea_null &&
                keaType != ssl_kea_tls13_any &&
                !PK11_TokenExists(kea_alg_defs[keaType])) {
                suite->isPresent = PR_FALSE;
            }

            if (cipher_alg != ssl_calg_null &&
                !PK11_TokenExists(cipher_mech)) {
                suite->isPresent = PR_FALSE;
            }

            if (suite->isPresent) {
                ++numPresent;
            }
        }
    }
    PORT_AssertArg(numPresent > 0 || numEnabled == 0);
    if (numPresent == 0) {
        PORT_SetError(SSL_ERROR_NO_CIPHERS_SUPPORTED);
    }
    return numPresent;
}

/* Return PR_TRUE if suite is usable.  This if the suite is permitted by policy,
 * enabled, has a certificate (as needed), has a viable key agreement method, is
 * usable with the negotiated TLS version, and is otherwise usable. */
PRBool
ssl3_config_match(const ssl3CipherSuiteCfg *suite, PRUint8 policy,
                  const SSLVersionRange *vrange, const sslSocket *ss)
{
    const ssl3CipherSuiteDef *cipher_def;
    const ssl3KEADef *kea_def;

    if (!suite) {
        PORT_Assert(suite);
        return PR_FALSE;
    }

    PORT_Assert(policy != SSL_NOT_ALLOWED);
    if (policy == SSL_NOT_ALLOWED)
        return PR_FALSE;

    if (!suite->enabled || !suite->isPresent)
        return PR_FALSE;

    if ((suite->policy == SSL_NOT_ALLOWED) ||
        (suite->policy > policy))
        return PR_FALSE;

    PORT_Assert(ss != NULL);
    cipher_def = ssl_LookupCipherSuiteDef(suite->cipher_suite);
    PORT_Assert(cipher_def != NULL);
    kea_def = &kea_defs[cipher_def->key_exchange_alg];
    PORT_Assert(kea_def != NULL);
    if (!ssl_KEAEnabled(ss, kea_def->exchKeyType)) {
        return PR_FALSE;
    }

    if (ss->sec.isServer && !ssl_HasCert(ss, vrange->max, kea_def->authKeyType)) {
        return PR_FALSE;
    }

    /* If a PSK is selected, disable suites that use a different hash than
     * the PSK. We advertise non-PSK-compatible suites in the CH, as we could
     * fallback to certificate auth. The client handler will check hash
     * compatibility before committing to use the PSK. */
    if (ss->xtnData.selectedPsk) {
        if (ss->xtnData.selectedPsk->hash != cipher_def->prf_hash) {
            return PR_FALSE;
        }
    }

    return ssl3_CipherSuiteAllowedForVersionRange(suite->cipher_suite, vrange);
}

/* For TLS 1.3, when resuming, check for a ciphersuite that is both compatible
 * with the identified ciphersuite and enabled. */
static PRBool
tls13_ResumptionCompatible(sslSocket *ss, ssl3CipherSuite suite)
{
    SSLVersionRange vrange = { SSL_LIBRARY_VERSION_TLS_1_3,
                               SSL_LIBRARY_VERSION_TLS_1_3 };
    SSLHashType hash = tls13_GetHashForCipherSuite(suite);
    for (unsigned int i = 0; i < PR_ARRAY_SIZE(cipher_suite_defs); i++) {
        if (cipher_suite_defs[i].prf_hash == hash) {
            const ssl3CipherSuiteCfg *suiteCfg =
                ssl_LookupCipherSuiteCfg(cipher_suite_defs[i].cipher_suite,
                                         ss->cipherSuites);
            if (suite && ssl3_config_match(suiteCfg, ss->ssl3.policy, &vrange, ss)) {
                return PR_TRUE;
            }
        }
    }
    return PR_FALSE;
}

/*
 * Null compression, mac and encryption functions
 */
SECStatus
Null_Cipher(void *ctx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen,
            const unsigned char *input, unsigned int inputLen)
{
    if (inputLen > maxOutputLen) {
        *outputLen = 0; /* Match PK11_CipherOp in setting outputLen */
        PORT_SetError(SEC_ERROR_OUTPUT_LEN);
        return SECFailure;
    }
    *outputLen = inputLen;
    if (inputLen > 0 && input != output) {
        PORT_Memcpy(output, input, inputLen);
    }
    return SECSuccess;
}

/*
 * SSL3 Utility functions
 */

static void
ssl_SetSpecVersions(sslSocket *ss, ssl3CipherSpec *spec)
{
    spec->version = ss->version;
    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        tls13_SetSpecRecordVersion(ss, spec);
    } else if (IS_DTLS(ss)) {
        spec->recordVersion = dtls_TLSVersionToDTLSVersion(ss->version);
    } else {
        spec->recordVersion = ss->version;
    }
}

/* allowLargerPeerVersion controls whether the function will select the
 * highest enabled SSL version or fail when peerVersion is greater than the
 * highest enabled version.
 *
 * If allowLargerPeerVersion is true, peerVersion is the peer's highest
 * enabled version rather than the peer's selected version.
 */
SECStatus
ssl3_NegotiateVersion(sslSocket *ss, SSL3ProtocolVersion peerVersion,
                      PRBool allowLargerPeerVersion)
{
    SSL3ProtocolVersion negotiated;

    /* Prevent negotiating to a lower version in response to a TLS 1.3 HRR. */
    if (ss->ssl3.hs.helloRetry) {
        PORT_SetError(SSL_ERROR_UNSUPPORTED_VERSION);
        return SECFailure;
    }

    if (SSL_ALL_VERSIONS_DISABLED(&ss->vrange)) {
        PORT_SetError(SSL_ERROR_SSL_DISABLED);
        return SECFailure;
    }

    if (peerVersion < ss->vrange.min ||
        (peerVersion > ss->vrange.max && !allowLargerPeerVersion)) {
        PORT_SetError(SSL_ERROR_UNSUPPORTED_VERSION);
        return SECFailure;
    }

    negotiated = PR_MIN(peerVersion, ss->vrange.max);
    PORT_Assert(ssl3_VersionIsSupported(ss->protocolVariant, negotiated));
    if (ss->firstHsDone && ss->version != negotiated) {
        PORT_SetError(SSL_ERROR_UNSUPPORTED_VERSION);
        return SECFailure;
    }

    ss->version = negotiated;
    return SECSuccess;
}

/* Used by the client when the server produces a version number.
 * This reads, validates, and normalizes the value. */
SECStatus
ssl_ClientReadVersion(sslSocket *ss, PRUint8 **b, unsigned int *len,
                      SSL3ProtocolVersion *version)
{
    SSL3ProtocolVersion v;
    PRUint32 temp;
    SECStatus rv;

    rv = ssl3_ConsumeHandshakeNumber(ss, &temp, 2, b, len);
    if (rv != SECSuccess) {
        return SECFailure; /* alert has been sent */
    }
    v = (SSL3ProtocolVersion)temp;

    if (IS_DTLS(ss)) {
        v = dtls_DTLSVersionToTLSVersion(v);
        /* Check for failure. */
        if (!v || v > SSL_LIBRARY_VERSION_MAX_SUPPORTED) {
            SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
            return SECFailure;
        }
    }

    /* You can't negotiate TLS 1.3 this way. */
    if (v >= SSL_LIBRARY_VERSION_TLS_1_3) {
        SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
        return SECFailure;
    }
    *version = v;
    return SECSuccess;
}

SECStatus
ssl3_GetNewRandom(SSL3Random random)
{
    SECStatus rv;

    rv = PK11_GenerateRandom(random, SSL3_RANDOM_LENGTH);
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_GENERATE_RANDOM_FAILURE);
    }
    return rv;
}

SECStatus
ssl3_SignHashesWithPrivKey(SSL3Hashes *hash, SECKEYPrivateKey *key,
                           SSLSignatureScheme scheme, PRBool isTls, SECItem *buf)
{
    SECStatus rv = SECFailure;
    PRBool doDerEncode = PR_FALSE;
    PRBool useRsaPss = ssl_IsRsaPssSignatureScheme(scheme);
    SECItem hashItem;

    buf->data = NULL;

    switch (SECKEY_GetPrivateKeyType(key)) {
        case rsaKey:
            hashItem.data = hash->u.raw;
            hashItem.len = hash->len;
            break;
        case dsaKey:
            doDerEncode = isTls;
            /* ssl_hash_none is used to specify the MD5/SHA1 concatenated hash.
             * In that case, we use just the SHA1 part. */
            if (hash->hashAlg == ssl_hash_none) {
                hashItem.data = hash->u.s.sha;
                hashItem.len = sizeof(hash->u.s.sha);
            } else {
                hashItem.data = hash->u.raw;
                hashItem.len = hash->len;
            }
            break;
        case ecKey:
            doDerEncode = PR_TRUE;
            /* ssl_hash_none is used to specify the MD5/SHA1 concatenated hash.
             * In that case, we use just the SHA1 part. */
            if (hash->hashAlg == ssl_hash_none) {
                hashItem.data = hash->u.s.sha;
                hashItem.len = sizeof(hash->u.s.sha);
            } else {
                hashItem.data = hash->u.raw;
                hashItem.len = hash->len;
            }
            break;
        default:
            PORT_SetError(SEC_ERROR_INVALID_KEY);
            goto done;
    }
    PRINT_BUF(60, (NULL, "hash(es) to be signed", hashItem.data, hashItem.len));

    if (useRsaPss || hash->hashAlg == ssl_hash_none) {
        CK_MECHANISM_TYPE mech = PK11_MapSignKeyType(key->keyType);
        int signatureLen = PK11_SignatureLen(key);

        SECItem *params = NULL;
        CK_RSA_PKCS_PSS_PARAMS pssParams;
        SECItem pssParamsItem = { siBuffer,
                                  (unsigned char *)&pssParams,
                                  sizeof(pssParams) };

        if (signatureLen <= 0) {
            PORT_SetError(SEC_ERROR_INVALID_KEY);
            goto done;
        }

        buf->len = (unsigned)signatureLen;
        buf->data = (unsigned char *)PORT_Alloc(signatureLen);
        if (!buf->data)
            goto done; /* error code was set. */

        if (useRsaPss) {
            pssParams.hashAlg = ssl3_GetHashMechanismByHashType(hash->hashAlg);
            pssParams.mgf = ssl3_GetMgfMechanismByHashType(hash->hashAlg);
            pssParams.sLen = hashItem.len;
            params = &pssParamsItem;
            mech = CKM_RSA_PKCS_PSS;
        }

        rv = PK11_SignWithMechanism(key, mech, params, buf, &hashItem);
    } else {
        SECOidTag hashOID = ssl3_HashTypeToOID(hash->hashAlg);
        rv = SGN_Digest(key, hashOID, buf, &hashItem);
    }
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_SIGN_HASHES_FAILURE);
    } else if (doDerEncode) {
        SECItem derSig = { siBuffer, NULL, 0 };

        /* This also works for an ECDSA signature */
        rv = DSAU_EncodeDerSigWithLen(&derSig, buf, buf->len);
        if (rv == SECSuccess) {
            PORT_Free(buf->data); /* discard unencoded signature. */
            *buf = derSig;        /* give caller encoded signature. */
        } else if (derSig.data) {
            PORT_Free(derSig.data);
        }
    }

    PRINT_BUF(60, (NULL, "signed hashes", (unsigned char *)buf->data, buf->len));
done:
    if (rv != SECSuccess && buf->data) {
        PORT_Free(buf->data);
        buf->data = NULL;
    }
    return rv;
}

/* Called by ssl3_SendServerKeyExchange and ssl3_SendCertificateVerify */
SECStatus
ssl3_SignHashes(sslSocket *ss, SSL3Hashes *hash, SECKEYPrivateKey *key,
                SECItem *buf)
{
    SECStatus rv = SECFailure;
    PRBool isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);
    SSLSignatureScheme scheme = ss->ssl3.hs.signatureScheme;

    rv = ssl3_SignHashesWithPrivKey(hash, key, scheme, isTLS, buf);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (ss->sec.isServer) {
        ss->sec.signatureScheme = scheme;
        ss->sec.authType = ssl_SignatureSchemeToAuthType(scheme);
    }

    return SECSuccess;
}

/* Called from ssl3_VerifySignedHashes and tls13_HandleCertificateVerify. */
SECStatus
ssl_VerifySignedHashesWithPubKey(sslSocket *ss, SECKEYPublicKey *key,
                                 SSLSignatureScheme scheme,
                                 SSL3Hashes *hash, SECItem *buf)
{
    SECItem *signature = NULL;
    SECStatus rv = SECFailure;
    SECItem hashItem;
    SECOidTag encAlg;
    SECOidTag hashAlg;
    void *pwArg = ss->pkcs11PinArg;
    PRBool isRsaPssScheme = ssl_IsRsaPssSignatureScheme(scheme);

    PRINT_BUF(60, (NULL, "check signed hashes", buf->data, buf->len));

    hashAlg = ssl3_HashTypeToOID(hash->hashAlg);
    switch (SECKEY_GetPublicKeyType(key)) {
        case rsaKey:
            encAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
            hashItem.data = hash->u.raw;
            hashItem.len = hash->len;
            if (scheme == ssl_sig_none) {
                scheme = ssl_sig_rsa_pkcs1_sha1md5;
            }
            break;
        case dsaKey:
            encAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
            /* ssl_hash_none is used to specify the MD5/SHA1 concatenated hash.
             * In that case, we use just the SHA1 part. */
            if (hash->hashAlg == ssl_hash_none) {
                hashItem.data = hash->u.s.sha;
                hashItem.len = sizeof(hash->u.s.sha);
            } else {
                hashItem.data = hash->u.raw;
                hashItem.len = hash->len;
            }
            /* Allow DER encoded DSA signatures in SSL 3.0 */
            if (ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0 ||
                buf->len != SECKEY_SignatureLen(key)) {
                signature = DSAU_DecodeDerSigToLen(buf, SECKEY_SignatureLen(key));
                if (!signature) {
                    PORT_SetError(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
                    goto loser;
                }
                buf = signature;
            }
            if (scheme == ssl_sig_none) {
                scheme = ssl_sig_dsa_sha1;
            }
            break;

        case ecKey:
            encAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
            /* ssl_hash_none is used to specify the MD5/SHA1 concatenated hash.
             * In that case, we use just the SHA1 part.
             * ECDSA signatures always encode the integers r and s using ASN.1
             * (unlike DSA where ASN.1 encoding is used with TLS but not with
             * SSL3). So we can use VFY_VerifyDigestDirect for ECDSA.
             */
            if (hash->hashAlg == ssl_hash_none) {
                hashAlg = SEC_OID_SHA1;
                hashItem.data = hash->u.s.sha;
                hashItem.len = sizeof(hash->u.s.sha);
            } else {
                hashItem.data = hash->u.raw;
                hashItem.len = hash->len;
            }
            if (scheme == ssl_sig_none) {
                scheme = ssl_sig_ecdsa_sha1;
            }
            break;

        default:
            PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG);
            goto loser;
    }

    PRINT_BUF(60, (NULL, "hash(es) to be verified",
                   hashItem.data, hashItem.len));

    if (isRsaPssScheme ||
        hashAlg == SEC_OID_UNKNOWN ||
        SECKEY_GetPublicKeyType(key) == dsaKey) {
        /* VFY_VerifyDigestDirect requires DSA signatures to be DER-encoded.
         * DSA signatures are DER-encoded in TLS but not in SSL3 and the code
         * above always removes the DER encoding of DSA signatures when
         * present. Thus DSA signatures are always verified with PK11_Verify.
         */
        CK_MECHANISM_TYPE mech = PK11_MapSignKeyType(key->keyType);

        SECItem *params = NULL;
        CK_RSA_PKCS_PSS_PARAMS pssParams;
        SECItem pssParamsItem = { siBuffer,
                                  (unsigned char *)&pssParams,
                                  sizeof(pssParams) };

        if (isRsaPssScheme) {
            pssParams.hashAlg = ssl3_GetHashMechanismByHashType(hash->hashAlg);
            pssParams.mgf = ssl3_GetMgfMechanismByHashType(hash->hashAlg);
            pssParams.sLen = hashItem.len;
            params = &pssParamsItem;
            mech = CKM_RSA_PKCS_PSS;
        }

        rv = PK11_VerifyWithMechanism(key, mech, params, buf, &hashItem, pwArg);
    } else {
        rv = VFY_VerifyDigestDirect(&hashItem, key, buf, encAlg, hashAlg,
                                    pwArg);
    }
    if (signature) {
        SECITEM_FreeItem(signature, PR_TRUE);
    }
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
    }
    if (!ss->sec.isServer) {
        ss->sec.signatureScheme = scheme;
        ss->sec.authType = ssl_SignatureSchemeToAuthType(scheme);
    }

loser:
#ifdef UNSAFE_FUZZER_MODE
    rv = SECSuccess;
    PORT_SetError(0);
#endif
    return rv;
}

/* Called from ssl3_HandleServerKeyExchange, ssl3_HandleCertificateVerify */
SECStatus
ssl3_VerifySignedHashes(sslSocket *ss, SSLSignatureScheme scheme, SSL3Hashes *hash,
                        SECItem *buf)
{
    SECKEYPublicKey *pubKey =
        SECKEY_ExtractPublicKey(&ss->sec.peerCert->subjectPublicKeyInfo);
    if (pubKey == NULL) {
        ssl_MapLowLevelError(SSL_ERROR_EXTRACT_PUBLIC_KEY_FAILURE);
        return SECFailure;
    }
    SECStatus rv = ssl_VerifySignedHashesWithPubKey(ss, pubKey, scheme,
                                                    hash, buf);
    SECKEY_DestroyPublicKey(pubKey);
    return rv;
}

/* Caller must set hiLevel error code. */
/* Called from ssl3_ComputeDHKeyHash
 * which are called from ssl3_HandleServerKeyExchange.
 *
 * hashAlg: ssl_hash_none indicates the pre-1.2, MD5/SHA1 combination hash.
 */
SECStatus
ssl3_ComputeCommonKeyHash(SSLHashType hashAlg,
                          PRUint8 *hashBuf, unsigned int bufLen,
                          SSL3Hashes *hashes)
{
    SECStatus rv;
    SECOidTag hashOID;
    PRUint32 policy;

    if (hashAlg == ssl_hash_none) {
        if ((NSS_GetAlgorithmPolicy(SEC_OID_SHA1, &policy) == SECSuccess) &&
            !(policy & NSS_USE_ALG_IN_SSL_KX)) {
            ssl_MapLowLevelError(SSL_ERROR_UNSUPPORTED_HASH_ALGORITHM);
            return SECFailure;
        }
        rv = PK11_HashBuf(SEC_OID_MD5, hashes->u.s.md5, hashBuf, bufLen);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
            return rv;
        }
        rv = PK11_HashBuf(SEC_OID_SHA1, hashes->u.s.sha, hashBuf, bufLen);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
            return rv;
        }
        hashes->len = MD5_LENGTH + SHA1_LENGTH;
    } else {
        hashOID = ssl3_HashTypeToOID(hashAlg);
        if ((NSS_GetAlgorithmPolicy(hashOID, &policy) == SECSuccess) &&
            !(policy & NSS_USE_ALG_IN_SSL_KX)) {
            ssl_MapLowLevelError(SSL_ERROR_UNSUPPORTED_HASH_ALGORITHM);
            return SECFailure;
        }
        hashes->len = HASH_ResultLenByOidTag(hashOID);
        if (hashes->len == 0 || hashes->len > sizeof(hashes->u.raw)) {
            ssl_MapLowLevelError(SSL_ERROR_UNSUPPORTED_HASH_ALGORITHM);
            return SECFailure;
        }
        rv = PK11_HashBuf(hashOID, hashes->u.raw, hashBuf, bufLen);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
            return rv;
        }
    }
    hashes->hashAlg = hashAlg;
    return SECSuccess;
}

/* Caller must set hiLevel error code. */
/* Called from ssl3_HandleServerKeyExchange. */
static SECStatus
ssl3_ComputeDHKeyHash(sslSocket *ss, SSLHashType hashAlg, SSL3Hashes *hashes,
                      SECItem dh_p, SECItem dh_g, SECItem dh_Ys, PRBool padY)
{
    sslBuffer buf = SSL_BUFFER_EMPTY;
    SECStatus rv;
    unsigned int yLen;
    unsigned int i;

    PORT_Assert(dh_p.data);
    PORT_Assert(dh_g.data);
    PORT_Assert(dh_Ys.data);

    rv = sslBuffer_Append(&buf, ss->ssl3.hs.client_random, SSL3_RANDOM_LENGTH);
    if (rv != SECSuccess) {
        goto loser;
    }
    rv = sslBuffer_Append(&buf, ss->ssl3.hs.server_random, SSL3_RANDOM_LENGTH);
    if (rv != SECSuccess) {
        goto loser;
    }
    /* p */
    rv = sslBuffer_AppendVariable(&buf, dh_p.data, dh_p.len, 2);
    if (rv != SECSuccess) {
        goto loser;
    }
    /* g */
    rv = sslBuffer_AppendVariable(&buf, dh_g.data, dh_g.len, 2);
    if (rv != SECSuccess) {
        goto loser;
    }
    /* y - complicated by padding */
    yLen = padY ? dh_p.len : dh_Ys.len;
    rv = sslBuffer_AppendNumber(&buf, yLen, 2);
    if (rv != SECSuccess) {
        goto loser;
    }
    /* If we're padding Y, dh_Ys can't be longer than dh_p. */
    PORT_Assert(!padY || dh_p.len >= dh_Ys.len);
    for (i = dh_Ys.len; i < yLen; ++i) {
        rv = sslBuffer_AppendNumber(&buf, 0, 1);
        if (rv != SECSuccess) {
            goto loser;
        }
    }
    rv = sslBuffer_Append(&buf, dh_Ys.data, dh_Ys.len);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = ssl3_ComputeCommonKeyHash(hashAlg, SSL_BUFFER_BASE(&buf),
                                   SSL_BUFFER_LEN(&buf), hashes);
    if (rv != SECSuccess) {
        goto loser;
    }

    PRINT_BUF(95, (NULL, "DHkey hash: ", SSL_BUFFER_BASE(&buf),
                   SSL_BUFFER_LEN(&buf)));
    if (hashAlg == ssl_hash_none) {
        PRINT_BUF(95, (NULL, "DHkey hash: MD5 result",
                       hashes->u.s.md5, MD5_LENGTH));
        PRINT_BUF(95, (NULL, "DHkey hash: SHA1 result",
                       hashes->u.s.sha, SHA1_LENGTH));
    } else {
        PRINT_BUF(95, (NULL, "DHkey hash: result",
                       hashes->u.raw, hashes->len));
    }

    sslBuffer_Clear(&buf);
    return SECSuccess;

loser:
    sslBuffer_Clear(&buf);
    return SECFailure;
}

static SECStatus
ssl3_SetupPendingCipherSpec(sslSocket *ss, SSLSecretDirection direction,
                            const ssl3CipherSuiteDef *suiteDef,
                            ssl3CipherSpec **specp)
{
    ssl3CipherSpec *spec;
    const ssl3CipherSpec *prev;

    prev = (direction == ssl_secret_write) ? ss->ssl3.cwSpec : ss->ssl3.crSpec;
    if (prev->epoch == PR_UINT16_MAX) {
        PORT_SetError(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED);
        return SECFailure;
    }

    spec = ssl_CreateCipherSpec(ss, direction);
    if (!spec) {
        return SECFailure;
    }

    spec->cipherDef = ssl_GetBulkCipherDef(suiteDef);
    spec->macDef = ssl_GetMacDef(ss, suiteDef);

    spec->epoch = prev->epoch + 1;
    spec->nextSeqNum = 0;
    if (IS_DTLS(ss) && direction == ssl_secret_read) {
        dtls_InitRecvdRecords(&spec->recvdRecords);
    }
    ssl_SetSpecVersions(ss, spec);

    ssl_SaveCipherSpec(ss, spec);
    *specp = spec;
    return SECSuccess;
}

/* Fill in the pending cipher spec with info from the selected ciphersuite.
** This is as much initialization as we can do without having key material.
** Called from ssl3_HandleServerHello(), ssl3_SendServerHello()
** Caller must hold the ssl3 handshake lock.
** Acquires & releases SpecWriteLock.
*/
SECStatus
ssl3_SetupBothPendingCipherSpecs(sslSocket *ss)
{
    ssl3CipherSuite suite = ss->ssl3.hs.cipher_suite;
    SSL3KeyExchangeAlgorithm kea;
    const ssl3CipherSuiteDef *suiteDef;
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->version < SSL_LIBRARY_VERSION_TLS_1_3);

    ssl_GetSpecWriteLock(ss); /*******************************/

    /* This hack provides maximal interoperability with SSL 3 servers. */
    if (ss->ssl3.cwSpec->macDef->mac == ssl_mac_null) {
        /* SSL records are not being MACed. */
        ss->ssl3.cwSpec->version = ss->version;
    }

    SSL_TRC(3, ("%d: SSL3[%d]: Set XXX Pending Cipher Suite to 0x%04x",
                SSL_GETPID(), ss->fd, suite));

    suiteDef = ssl_LookupCipherSuiteDef(suite);
    if (suiteDef == NULL) {
        goto loser;
    }

    if (IS_DTLS(ss)) {
        /* Double-check that we did not pick an RC4 suite */
        PORT_Assert(suiteDef->bulk_cipher_alg != cipher_rc4);
    }

    ss->ssl3.hs.suite_def = suiteDef;

    kea = suiteDef->key_exchange_alg;
    ss->ssl3.hs.kea_def = &kea_defs[kea];
    PORT_Assert(ss->ssl3.hs.kea_def->kea == kea);

    rv = ssl3_SetupPendingCipherSpec(ss, ssl_secret_read, suiteDef,
                                     &ss->ssl3.prSpec);
    if (rv != SECSuccess) {
        goto loser;
    }
    rv = ssl3_SetupPendingCipherSpec(ss, ssl_secret_write, suiteDef,
                                     &ss->ssl3.pwSpec);
    if (rv != SECSuccess) {
        goto loser;
    }

    if (ssl3_ExtensionNegotiated(ss, ssl_record_size_limit_xtn)) {
        ss->ssl3.prSpec->recordSizeLimit = PR_MIN(MAX_FRAGMENT_LENGTH,
                                                  ss->opt.recordSizeLimit);
        ss->ssl3.pwSpec->recordSizeLimit = PR_MIN(MAX_FRAGMENT_LENGTH,
                                                  ss->xtnData.recordSizeLimit);
    }

    ssl_ReleaseSpecWriteLock(ss); /*******************************/
    return SECSuccess;

loser:
    ssl_ReleaseSpecWriteLock(ss);
    return SECFailure;
}

/* ssl3_BuildRecordPseudoHeader writes the SSL/TLS pseudo-header (the data which
 * is included in the MAC or AEAD additional data) to |buf|. See
 * https://tools.ietf.org/html/rfc5246#section-6.2.3.3 for the definition of the
 * AEAD additional data.
 *
 * TLS pseudo-header includes the record's version field, SSL's doesn't. Which
 * pseudo-header definition to use should be decided based on the version of
 * the protocol that was negotiated when the cipher spec became current, NOT
 * based on the version value in the record itself, and the decision is passed
 * to this function as the |includesVersion| argument. But, the |version|
 * argument should be the record's version value.
 */
static SECStatus
ssl3_BuildRecordPseudoHeader(DTLSEpoch epoch,
                             sslSequenceNumber seqNum,
                             SSLContentType ct,
                             PRBool includesVersion,
                             SSL3ProtocolVersion version,
                             PRBool isDTLS,
                             int length,
                             sslBuffer *buf)
{
    SECStatus rv;
    if (isDTLS) {
        rv = sslBuffer_AppendNumber(buf, epoch, 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        rv = sslBuffer_AppendNumber(buf, seqNum, 6);
    } else {
        rv = sslBuffer_AppendNumber(buf, seqNum, 8);
    }
    if (rv != SECSuccess) {
        return SECFailure;
    }
    rv = sslBuffer_AppendNumber(buf, ct, 1);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    /* SSL3 MAC doesn't include the record's version field. */
    if (includesVersion) {
        /* TLS MAC and AEAD additional data include version. */
        rv = sslBuffer_AppendNumber(buf, version, 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }
    rv = sslBuffer_AppendNumber(buf, length, 2);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    return SECSuccess;
}

/* Initialize encryption and MAC contexts for pending spec.
 * Master Secret already is derived.
 * Caller holds Spec write lock.
 */
static SECStatus
ssl3_InitPendingContexts(sslSocket *ss, ssl3CipherSpec *spec)
{
    CK_MECHANISM_TYPE encMechanism;
    CK_ATTRIBUTE_TYPE encMode;
    SECItem macParam;
    CK_ULONG macLength;
    SECItem iv;
    SSLCipherAlgorithm calg;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSpecWriteLock(ss));

    calg = spec->cipherDef->calg;
    PORT_Assert(alg2Mech[calg].calg == calg);

    if (spec->cipherDef->type != type_aead) {
        macLength = spec->macDef->mac_size;

        /*
        ** Now setup the MAC contexts,
        **   crypto contexts are setup below.
        */
        macParam.data = (unsigned char *)&macLength;
        macParam.len = sizeof(macLength);
        macParam.type = siBuffer;

        spec->keyMaterial.macContext = PK11_CreateContextBySymKey(
            spec->macDef->mmech, CKA_SIGN, spec->keyMaterial.macKey, &macParam);
        if (!spec->keyMaterial.macContext) {
            ssl_MapLowLevelError(SSL_ERROR_SYM_KEY_CONTEXT_FAILURE);
            return SECFailure;
        }
    }

    /*
    ** Now setup the crypto contexts.
    */
    if (calg == ssl_calg_null) {
        spec->cipher = Null_Cipher;
        return SECSuccess;
    }

    encMechanism = ssl3_Alg2Mech(calg);
    encMode = (spec->direction == ssl_secret_write) ? CKA_ENCRYPT : CKA_DECRYPT;
    if (spec->cipherDef->type == type_aead) {
        encMode |= CKA_NSS_MESSAGE;
        iv.data = NULL;
        iv.len = 0;
    } else {
        spec->cipher = (SSLCipher)PK11_CipherOp;
        iv.data = spec->keyMaterial.iv;
        iv.len = spec->cipherDef->iv_size;
    }

    /*
     * build the context
     */
    spec->cipherContext = PK11_CreateContextBySymKey(encMechanism, encMode,
                                                     spec->keyMaterial.key,
                                                     &iv);
    if (!spec->cipherContext) {
        ssl_MapLowLevelError(SSL_ERROR_SYM_KEY_CONTEXT_FAILURE);
        return SECFailure;
    }

    return SECSuccess;
}

/* Complete the initialization of all keys, ciphers, MACs and their contexts
 * for the pending Cipher Spec.
 * Called from: ssl3_SendClientKeyExchange  (for Full handshake)
 *              ssl3_HandleRSAClientKeyExchange (for Full handshake)
 *              ssl3_HandleServerHello      (for session restart)
 *              ssl3_HandleClientHello      (for session restart)
 * Sets error code, but caller probably should override to disambiguate.
 *
 * If |secret| is a master secret from a previous connection is reused, |derive|
 * is PR_FALSE.  If the secret is a pre-master secret, then |derive| is PR_TRUE
 * and the master secret is derived from |secret|.
 */
SECStatus
ssl3_InitPendingCipherSpecs(sslSocket *ss, PK11SymKey *secret, PRBool derive)
{
    PK11SymKey *masterSecret;
    ssl3CipherSpec *pwSpec;
    ssl3CipherSpec *prSpec;
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(secret);

    ssl_GetSpecWriteLock(ss); /**************************************/

    PORT_Assert(ss->ssl3.pwSpec);
    PORT_Assert(ss->ssl3.cwSpec->epoch == ss->ssl3.crSpec->epoch);
    prSpec = ss->ssl3.prSpec;
    pwSpec = ss->ssl3.pwSpec;

    if (ss->ssl3.cwSpec->epoch == PR_UINT16_MAX) {
        /* The problem here is that we have rehandshaked too many
         * times (you are not allowed to wrap the epoch). The
         * spec says you should be discarding the connection
         * and start over, so not much we can do here. */
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        goto loser;
    }

    if (derive) {
        rv = ssl3_ComputeMasterSecret(ss, secret, &masterSecret);
        if (rv != SECSuccess) {
            goto loser;
        }
    } else {
        masterSecret = secret;
    }

    PORT_Assert(masterSecret);
    rv = ssl3_DeriveConnectionKeys(ss, masterSecret);
    if (rv != SECSuccess) {
        if (derive) {
            /* masterSecret was created here. */
            PK11_FreeSymKey(masterSecret);
        }
        goto loser;
    }

    /* Both cipher specs maintain a reference to the master secret, since each
     * is managed and freed independently. */
    prSpec->masterSecret = masterSecret;
    pwSpec->masterSecret = PK11_ReferenceSymKey(masterSecret);
    rv = ssl3_InitPendingContexts(ss, ss->ssl3.prSpec);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = ssl3_InitPendingContexts(ss, ss->ssl3.pwSpec);
    if (rv != SECSuccess) {
        goto loser;
    }

    ssl_ReleaseSpecWriteLock(ss); /******************************/
    return SECSuccess;

loser:
    ssl_ReleaseSpecWriteLock(ss); /******************************/
    ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
    return SECFailure;
}

/*
 * 60 bytes is 3 times the maximum length MAC size that is supported.
 */
static const unsigned char mac_pad_1[60] = {
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36
};
static const unsigned char mac_pad_2[60] = {
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
    0x5c, 0x5c, 0x5c, 0x5c
};

/* Called from: ssl3_SendRecord()
** Caller must already hold the SpecReadLock. (wish we could assert that!)
*/
static SECStatus
ssl3_ComputeRecordMAC(
    ssl3CipherSpec *spec,
    const unsigned char *header,
    unsigned int headerLen,
    const PRUint8 *input,
    int inputLen,
    unsigned char *outbuf,
    unsigned int *outLen)
{
    PK11Context *context;
    int macSize = spec->macDef->mac_size;
    SECStatus rv;

    PRINT_BUF(95, (NULL, "frag hash1: header", header, headerLen));
    PRINT_BUF(95, (NULL, "frag hash1: input", input, inputLen));

    if (spec->macDef->mac == ssl_mac_null) {
        *outLen = 0;
        return SECSuccess;
    }

    context = spec->keyMaterial.macContext;
    rv = PK11_DigestBegin(context);
    rv |= PK11_DigestOp(context, header, headerLen);
    rv |= PK11_DigestOp(context, input, inputLen);
    rv |= PK11_DigestFinal(context, outbuf, outLen, macSize);
    PORT_Assert(rv != SECSuccess || *outLen == (unsigned)macSize);

    PRINT_BUF(95, (NULL, "frag hash2: result", outbuf, *outLen));

    if (rv != SECSuccess) {
        rv = SECFailure;
        ssl_MapLowLevelError(SSL_ERROR_MAC_COMPUTATION_FAILURE);
    }
    return rv;
}

/* Called from: ssl3_HandleRecord()
 * Caller must already hold the SpecReadLock. (wish we could assert that!)
 *
 * On entry:
 *   originalLen >= inputLen >= MAC size
*/
static SECStatus
ssl3_ComputeRecordMACConstantTime(
    ssl3CipherSpec *spec,
    const unsigned char *header,
    unsigned int headerLen,
    const PRUint8 *input,
    int inputLen,
    int originalLen,
    unsigned char *outbuf,
    unsigned int *outLen)
{
    CK_MECHANISM_TYPE macType;
    CK_NSS_MAC_CONSTANT_TIME_PARAMS params;
    SECItem param, inputItem, outputItem;
    int macSize = spec->macDef->mac_size;
    SECStatus rv;

    PORT_Assert(inputLen >= spec->macDef->mac_size);
    PORT_Assert(originalLen >= inputLen);

    if (spec->macDef->mac == ssl_mac_null) {
        *outLen = 0;
        return SECSuccess;
    }

    macType = CKM_NSS_HMAC_CONSTANT_TIME;
    if (spec->version == SSL_LIBRARY_VERSION_3_0) {
        macType = CKM_NSS_SSL3_MAC_CONSTANT_TIME;
    }

    params.macAlg = spec->macDef->mmech;
    params.ulBodyTotalLen = originalLen;
    params.pHeader = (unsigned char *)header; /* const cast */
    params.ulHeaderLen = headerLen;

    param.data = (unsigned char *)&params;
    param.len = sizeof(params);
    param.type = 0;

    inputItem.data = (unsigned char *)input;
    inputItem.len = inputLen;
    inputItem.type = 0;

    outputItem.data = outbuf;
    outputItem.len = *outLen;
    outputItem.type = 0;

    rv = PK11_SignWithSymKey(spec->keyMaterial.macKey, macType, &param,
                             &outputItem, &inputItem);
    if (rv != SECSuccess) {
        if (PORT_GetError() == SEC_ERROR_INVALID_ALGORITHM) {
            /* ssl3_ComputeRecordMAC() expects the MAC to have been removed
             * from the input length already. */
            return ssl3_ComputeRecordMAC(spec, header, headerLen,
                                         input, inputLen - macSize,
                                         outbuf, outLen);
        }

        *outLen = 0;
        rv = SECFailure;
        ssl_MapLowLevelError(SSL_ERROR_MAC_COMPUTATION_FAILURE);
        return rv;
    }

    PORT_Assert(outputItem.len == (unsigned)macSize);
    *outLen = outputItem.len;

    return rv;
}

static PRBool
ssl3_ClientAuthTokenPresent(sslSessionID *sid)
{
    PK11SlotInfo *slot = NULL;
    PRBool isPresent = PR_TRUE;

    /* we only care if we are doing client auth */
    if (!sid || !sid->u.ssl3.clAuthValid) {
        return PR_TRUE;
    }

    /* get the slot */
    slot = SECMOD_LookupSlot(sid->u.ssl3.clAuthModuleID,
                             sid->u.ssl3.clAuthSlotID);
    if (slot == NULL ||
        !PK11_IsPresent(slot) ||
        sid->u.ssl3.clAuthSeries != PK11_GetSlotSeries(slot) ||
        sid->u.ssl3.clAuthSlotID != PK11_GetSlotID(slot) ||
        sid->u.ssl3.clAuthModuleID != PK11_GetModuleID(slot) ||
        (PK11_NeedLogin(slot) && !PK11_IsLoggedIn(slot, NULL))) {
        isPresent = PR_FALSE;
    }
    if (slot) {
        PK11_FreeSlot(slot);
    }
    return isPresent;
}

/* Caller must hold the spec read lock. */
SECStatus
ssl3_MACEncryptRecord(ssl3CipherSpec *cwSpec,
                      PRBool isServer,
                      PRBool isDTLS,
                      SSLContentType ct,
                      const PRUint8 *pIn,
                      PRUint32 contentLen,
                      sslBuffer *wrBuf)
{
    SECStatus rv;
    PRUint32 macLen = 0;
    PRUint32 fragLen;
    PRUint32 p1Len, p2Len, oddLen = 0;
    unsigned int ivLen = 0;
    unsigned char pseudoHeaderBuf[13];
    sslBuffer pseudoHeader = SSL_BUFFER(pseudoHeaderBuf);
    unsigned int len;

    if (cwSpec->cipherDef->type == type_block &&
        cwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_1) {
        /* Prepend the per-record explicit IV using technique 2b from
         * RFC 4346 section 6.2.3.2: The IV is a cryptographically
         * strong random number XORed with the CBC residue from the previous
         * record.
         */
        ivLen = cwSpec->cipherDef->iv_size;
        if (ivLen > SSL_BUFFER_SPACE(wrBuf)) {
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }
        rv = PK11_GenerateRandom(SSL_BUFFER_NEXT(wrBuf), ivLen);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_GENERATE_RANDOM_FAILURE);
            return rv;
        }
        rv = cwSpec->cipher(cwSpec->cipherContext,
                            SSL_BUFFER_NEXT(wrBuf), /* output */
                            &len,                   /* outlen */
                            ivLen,                  /* max outlen */
                            SSL_BUFFER_NEXT(wrBuf), /* input */
                            ivLen);                 /* input len */
        if (rv != SECSuccess || len != ivLen) {
            PORT_SetError(SSL_ERROR_ENCRYPTION_FAILURE);
            return SECFailure;
        }

        rv = sslBuffer_Skip(wrBuf, len, NULL);
        PORT_Assert(rv == SECSuccess); /* Can't fail. */
    }

    rv = ssl3_BuildRecordPseudoHeader(
        cwSpec->epoch, cwSpec->nextSeqNum, ct,
        cwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_0, cwSpec->recordVersion,
        isDTLS, contentLen, &pseudoHeader);
    PORT_Assert(rv == SECSuccess);
    if (cwSpec->cipherDef->type == type_aead) {
        const unsigned int nonceLen = cwSpec->cipherDef->explicit_nonce_size;
        const unsigned int tagLen = cwSpec->cipherDef->tag_size;
        unsigned int ivOffset = 0;
        CK_GENERATOR_FUNCTION gen;
        /* ivOut includes the iv and the nonce and is the internal iv/nonce
         * for the AEAD function. On Encrypt, this is an in/out parameter */
        unsigned char ivOut[MAX_IV_LENGTH];
        ivLen = cwSpec->cipherDef->iv_size;

        PORT_Assert((ivLen + nonceLen) <= MAX_IV_LENGTH);
        PORT_Assert((ivLen + nonceLen) >= sizeof(sslSequenceNumber));

        if (nonceLen + contentLen + tagLen > SSL_BUFFER_SPACE(wrBuf)) {
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }

        if (nonceLen == 0) {
            ivOffset = ivLen - sizeof(sslSequenceNumber);
            gen = CKG_GENERATE_COUNTER_XOR;
        } else {
            ivOffset = ivLen;
            gen = CKG_GENERATE_COUNTER;
        }
        ivOffset = tls13_SetupAeadIv(isDTLS, ivOut, cwSpec->keyMaterial.iv,
                                     ivOffset, ivLen, cwSpec->epoch);
        rv = tls13_AEAD(cwSpec->cipherContext,
                        PR_FALSE,
                        gen, ivOffset * BPB,                /* iv generator params */
                        ivOut,                              /* iv in  */
                        ivOut,                              /* iv out */
                        ivLen + nonceLen,                   /* full iv length */
                        NULL, 0,                            /* nonce is generated*/
                        SSL_BUFFER_BASE(&pseudoHeader),     /* aad */
                        SSL_BUFFER_LEN(&pseudoHeader),      /* aadlen */
                        SSL_BUFFER_NEXT(wrBuf) + nonceLen,  /* output  */
                        &len,                               /* out len */
                        SSL_BUFFER_SPACE(wrBuf) - nonceLen, /* max out */
                        tagLen,
                        pIn, contentLen); /* input   */
        if (rv != SECSuccess) {
            PORT_SetError(SSL_ERROR_ENCRYPTION_FAILURE);
            return SECFailure;
        }
        len += nonceLen; /* include the nonce at the beginning */
        /* copy out the generated iv if we are using explict nonces */
        if (nonceLen) {
            PORT_Memcpy(SSL_BUFFER_NEXT(wrBuf), ivOut + ivLen, nonceLen);
        }

        rv = sslBuffer_Skip(wrBuf, len, NULL);
        PORT_Assert(rv == SECSuccess); /* Can't fail. */
    } else {
        int blockSize = cwSpec->cipherDef->block_size;

        /*
         * Add the MAC
         */
        rv = ssl3_ComputeRecordMAC(cwSpec, SSL_BUFFER_BASE(&pseudoHeader),
                                   SSL_BUFFER_LEN(&pseudoHeader),
                                   pIn, contentLen,
                                   SSL_BUFFER_NEXT(wrBuf) + contentLen, &macLen);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_MAC_COMPUTATION_FAILURE);
            return SECFailure;
        }
        p1Len = contentLen;
        p2Len = macLen;
        fragLen = contentLen + macLen; /* needs to be encrypted */
        PORT_Assert(fragLen <= MAX_FRAGMENT_LENGTH + 1024);

        /*
         * Pad the text (if we're doing a block cipher)
         * then Encrypt it
         */
        if (cwSpec->cipherDef->type == type_block) {
            unsigned char *pBuf;
            int padding_length;
            int i;

            oddLen = contentLen % blockSize;
            /* Assume blockSize is a power of two */
            padding_length = blockSize - 1 - ((fragLen) & (blockSize - 1));
            fragLen += padding_length + 1;
            PORT_Assert((fragLen % blockSize) == 0);

            /* Pad according to TLS rules (also acceptable to SSL3). */
            pBuf = SSL_BUFFER_NEXT(wrBuf) + fragLen - 1;
            for (i = padding_length + 1; i > 0; --i) {
                *pBuf-- = padding_length;
            }
            /* now, if contentLen is not a multiple of block size, fix it */
            p2Len = fragLen - p1Len;
        }
        if (p1Len < 256) {
            oddLen = p1Len;
            p1Len = 0;
        } else {
            p1Len -= oddLen;
        }
        if (oddLen) {
            p2Len += oddLen;
            PORT_Assert((blockSize < 2) ||
                        (p2Len % blockSize) == 0);
            memmove(SSL_BUFFER_NEXT(wrBuf) + p1Len, pIn + p1Len, oddLen);
        }
        if (p1Len > 0) {
            unsigned int cipherBytesPart1 = 0;
            rv = cwSpec->cipher(cwSpec->cipherContext,
                                SSL_BUFFER_NEXT(wrBuf), /* output */
                                &cipherBytesPart1,      /* actual outlen */
                                p1Len,                  /* max outlen */
                                pIn,
                                p1Len); /* input, and inputlen */
            PORT_Assert(rv == SECSuccess && cipherBytesPart1 == p1Len);
            if (rv != SECSuccess || cipherBytesPart1 != p1Len) {
                PORT_SetError(SSL_ERROR_ENCRYPTION_FAILURE);
                return SECFailure;
            }
            rv = sslBuffer_Skip(wrBuf, p1Len, NULL);
            PORT_Assert(rv == SECSuccess);
        }
        if (p2Len > 0) {
            unsigned int cipherBytesPart2 = 0;
            rv = cwSpec->cipher(cwSpec->cipherContext,
                                SSL_BUFFER_NEXT(wrBuf),
                                &cipherBytesPart2, /* output and actual outLen */
                                p2Len,             /* max outlen */
                                SSL_BUFFER_NEXT(wrBuf),
                                p2Len); /* input and inputLen*/
            PORT_Assert(rv == SECSuccess && cipherBytesPart2 == p2Len);
            if (rv != SECSuccess || cipherBytesPart2 != p2Len) {
                PORT_SetError(SSL_ERROR_ENCRYPTION_FAILURE);
                return SECFailure;
            }
            rv = sslBuffer_Skip(wrBuf, p2Len, NULL);
            PORT_Assert(rv == SECSuccess);
        }
    }

    return SECSuccess;
}

/* Note: though this can report failure, it shouldn't. */
SECStatus
ssl_InsertRecordHeader(const sslSocket *ss, ssl3CipherSpec *cwSpec,
                       SSLContentType contentType, sslBuffer *wrBuf,
                       PRBool *needsLength)
{
    SECStatus rv;

#ifndef UNSAFE_FUZZER_MODE
    if (cwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
        cwSpec->epoch > TrafficKeyClearText) {
        if (IS_DTLS(ss)) {
            return dtls13_InsertCipherTextHeader(ss, cwSpec, wrBuf,
                                                 needsLength);
        }
        contentType = ssl_ct_application_data;
    }
#endif
    rv = sslBuffer_AppendNumber(wrBuf, contentType, 1);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    rv = sslBuffer_AppendNumber(wrBuf, cwSpec->recordVersion, 2);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (IS_DTLS(ss)) {
        rv = sslBuffer_AppendNumber(wrBuf, cwSpec->epoch, 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        rv = sslBuffer_AppendNumber(wrBuf, cwSpec->nextSeqNum, 6);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }
    *needsLength = PR_TRUE;
    return SECSuccess;
}

SECStatus
ssl_ProtectRecord(sslSocket *ss, ssl3CipherSpec *cwSpec, SSLContentType ct,
                  const PRUint8 *pIn, PRUint32 contentLen, sslBuffer *wrBuf)
{
    PRBool needsLength;
    unsigned int lenOffset;
    SECStatus rv;

    PORT_Assert(cwSpec->direction == ssl_secret_write);
    PORT_Assert(SSL_BUFFER_LEN(wrBuf) == 0);
    PORT_Assert(cwSpec->cipherDef->max_records <= RECORD_SEQ_MAX);

    if (cwSpec->nextSeqNum >= cwSpec->cipherDef->max_records) {
        PORT_Assert(cwSpec->version < SSL_LIBRARY_VERSION_TLS_1_3);
        SSL_TRC(3, ("%d: SSL[-]: write sequence number at limit 0x%0llx",
                    SSL_GETPID(), cwSpec->nextSeqNum));
        PORT_SetError(SSL_ERROR_TOO_MANY_RECORDS);
        return SECFailure;
    }

    rv = ssl_InsertRecordHeader(ss, cwSpec, ct, wrBuf, &needsLength);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (needsLength) {
        rv = sslBuffer_Skip(wrBuf, 2, &lenOffset);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

#ifdef UNSAFE_FUZZER_MODE
    {
        unsigned int len;
        rv = Null_Cipher(NULL, SSL_BUFFER_NEXT(wrBuf), &len,
                         SSL_BUFFER_SPACE(wrBuf), pIn, contentLen);
        if (rv != SECSuccess) {
            return SECFailure; /* error was set */
        }
        rv = sslBuffer_Skip(wrBuf, len, NULL);
        PORT_Assert(rv == SECSuccess); /* Can't fail. */
    }
#else
    if (cwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        PRUint8 *cipherText = SSL_BUFFER_NEXT(wrBuf);
        unsigned int bufLen = SSL_BUFFER_LEN(wrBuf);
        rv = tls13_ProtectRecord(ss, cwSpec, ct, pIn, contentLen, wrBuf);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        if (IS_DTLS(ss)) {
            bufLen = SSL_BUFFER_LEN(wrBuf) - bufLen;
            rv = dtls13_MaskSequenceNumber(ss, cwSpec,
                                           SSL_BUFFER_BASE(wrBuf),
                                           cipherText, bufLen);
        }
    } else {
        rv = ssl3_MACEncryptRecord(cwSpec, ss->sec.isServer, IS_DTLS(ss), ct,
                                   pIn, contentLen, wrBuf);
    }
#endif
    if (rv != SECSuccess) {
        return SECFailure; /* error was set */
    }

    if (needsLength) {
        /* Insert the length. */
        rv = sslBuffer_InsertLength(wrBuf, lenOffset, 2);
        if (rv != SECSuccess) {
            PORT_Assert(0); /* Can't fail. */
            return SECFailure;
        }
    }

    ++cwSpec->nextSeqNum;
    return SECSuccess;
}

SECStatus
ssl_ProtectNextRecord(sslSocket *ss, ssl3CipherSpec *spec, SSLContentType ct,
                      const PRUint8 *pIn, unsigned int nIn,
                      unsigned int *written)
{
    sslBuffer *wrBuf = &ss->sec.writeBuf;
    unsigned int contentLen;
    unsigned int spaceNeeded;
    SECStatus rv;

    contentLen = PR_MIN(nIn, spec->recordSizeLimit);
    spaceNeeded = contentLen + SSL3_BUFFER_FUDGE;
    if (spec->version >= SSL_LIBRARY_VERSION_TLS_1_1 &&
        spec->cipherDef->type == type_block) {
        spaceNeeded += spec->cipherDef->iv_size;
    }
    if (spaceNeeded > SSL_BUFFER_SPACE(wrBuf)) {
        rv = sslBuffer_Grow(wrBuf, spaceNeeded);
        if (rv != SECSuccess) {
            SSL_DBG(("%d: SSL3[%d]: failed to expand write buffer to %d",
                     SSL_GETPID(), ss->fd, spaceNeeded));
            return SECFailure;
        }
    }

    rv = ssl_ProtectRecord(ss, spec, ct, pIn, contentLen, wrBuf);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    PRINT_BUF(50, (ss, "send (encrypted) record data:",
                   SSL_BUFFER_BASE(wrBuf), SSL_BUFFER_LEN(wrBuf)));
    *written = contentLen;
    return SECSuccess;
}

/* Process the plain text before sending it.
 * Returns the number of bytes of plaintext that were successfully sent
 *  plus the number of bytes of plaintext that were copied into the
 *  output (write) buffer.
 * Returns -1 on an error.  PR_WOULD_BLOCK_ERROR is set if the error is blocking
 *  and not terminal.
 *
 * Notes on the use of the private ssl flags:
 * (no private SSL flags)
 *    Attempt to make and send SSL records for all plaintext
 *    If non-blocking and a send gets WOULD_BLOCK,
 *    or if the pending (ciphertext) buffer is not empty,
 *    then buffer remaining bytes of ciphertext into pending buf,
 *    and continue to do that for all succssive records until all
 *    bytes are used.
 * ssl_SEND_FLAG_FORCE_INTO_BUFFER
 *    As above, except this suppresses all write attempts, and forces
 *    all ciphertext into the pending ciphertext buffer.
 * ssl_SEND_FLAG_USE_EPOCH (for DTLS)
 *    Forces the use of the provided epoch
 */
PRInt32
ssl3_SendRecord(sslSocket *ss,
                ssl3CipherSpec *cwSpec, /* non-NULL for DTLS retransmits */
                SSLContentType ct,
                const PRUint8 *pIn, /* input buffer */
                PRInt32 nIn,        /* bytes of input */
                PRInt32 flags)
{
    sslBuffer *wrBuf = &ss->sec.writeBuf;
    ssl3CipherSpec *spec;
    SECStatus rv;
    PRInt32 totalSent = 0;

    SSL_TRC(3, ("%d: SSL3[%d] SendRecord type: %s nIn=%d",
                SSL_GETPID(), ss->fd, ssl3_DecodeContentType(ct),
                nIn));
    PRINT_BUF(50, (ss, "Send record (plain text)", pIn, nIn));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(SSL_BUFFER_LEN(wrBuf) == 0);

    if (ss->ssl3.fatalAlertSent) {
        SSL_TRC(3, ("%d: SSL3[%d] Suppress write, fatal alert already sent",
                    SSL_GETPID(), ss->fd));
        if (ct != ssl_ct_alert) {
            /* If we are sending an alert, then we already have an
             * error, so don't overwrite. */
            PORT_SetError(SSL_ERROR_HANDSHAKE_FAILED);
        }
        return -1;
    }

    /* check for Token Presence */
    if (!ssl3_ClientAuthTokenPresent(ss->sec.ci.sid)) {
        PORT_SetError(SSL_ERROR_TOKEN_INSERTION_REMOVAL);
        return -1;
    }

    if (ss->recordWriteCallback) {
        PRUint16 epoch;
        ssl_GetSpecReadLock(ss);
        epoch = ss->ssl3.cwSpec->epoch;
        ssl_ReleaseSpecReadLock(ss);
        rv = ss->recordWriteCallback(ss->fd, epoch, ct, pIn, nIn,
                                     ss->recordWriteCallbackArg);
        if (rv != SECSuccess) {
            return -1;
        }
        return nIn;
    }

    if (cwSpec) {
        /* cwSpec can only be set for retransmissions of the DTLS handshake. */
        PORT_Assert(IS_DTLS(ss) &&
                    (ct == ssl_ct_handshake ||
                     ct == ssl_ct_change_cipher_spec));
        spec = cwSpec;
    } else {
        spec = ss->ssl3.cwSpec;
    }

    while (nIn > 0) {
        unsigned int written = 0;
        PRInt32 sent;

        ssl_GetSpecReadLock(ss);
        rv = ssl_ProtectNextRecord(ss, spec, ct, pIn, nIn, &written);
        ssl_ReleaseSpecReadLock(ss);
        if (rv != SECSuccess) {
            goto loser;
        }

        PORT_Assert(written > 0);
        /* DTLS should not fragment non-application data here. */
        if (IS_DTLS(ss) && ct != ssl_ct_application_data) {
            PORT_Assert(written == nIn);
        }

        pIn += written;
        nIn -= written;
        PORT_Assert(nIn >= 0);

        /* If there's still some previously saved ciphertext,
         * or the caller doesn't want us to send the data yet,
         * then add all our new ciphertext to the amount previously saved.
         */
        if ((ss->pendingBuf.len > 0) ||
            (flags & ssl_SEND_FLAG_FORCE_INTO_BUFFER)) {

            rv = ssl_SaveWriteData(ss, SSL_BUFFER_BASE(wrBuf),
                                   SSL_BUFFER_LEN(wrBuf));
            if (rv != SECSuccess) {
                /* presumably a memory error, SEC_ERROR_NO_MEMORY */
                goto loser;
            }

            if (!(flags & ssl_SEND_FLAG_FORCE_INTO_BUFFER)) {
                ss->handshakeBegun = 1;
                sent = ssl_SendSavedWriteData(ss);
                if (sent < 0 && PR_GetError() != PR_WOULD_BLOCK_ERROR) {
                    ssl_MapLowLevelError(SSL_ERROR_SOCKET_WRITE_FAILURE);
                    goto loser;
                }
                if (ss->pendingBuf.len) {
                    flags |= ssl_SEND_FLAG_FORCE_INTO_BUFFER;
                }
            }
        } else {
            PORT_Assert(SSL_BUFFER_LEN(wrBuf) > 0);
            ss->handshakeBegun = 1;
            sent = ssl_DefSend(ss, SSL_BUFFER_BASE(wrBuf),
                               SSL_BUFFER_LEN(wrBuf),
                               flags & ~ssl_SEND_FLAG_MASK);
            if (sent < 0) {
                if (PORT_GetError() != PR_WOULD_BLOCK_ERROR) {
                    ssl_MapLowLevelError(SSL_ERROR_SOCKET_WRITE_FAILURE);
                    goto loser;
                }
                /* we got PR_WOULD_BLOCK_ERROR, which means none was sent. */
                sent = 0;
            }
            if (SSL_BUFFER_LEN(wrBuf) > (unsigned int)sent) {
                if (IS_DTLS(ss)) {
                    /* DTLS just says no in this case. No buffering */
                    PORT_SetError(PR_WOULD_BLOCK_ERROR);
                    goto loser;
                }
                /* now take all the remaining unsent new ciphertext and
                 * append it to the buffer of previously unsent ciphertext.
                 */
                rv = ssl_SaveWriteData(ss, SSL_BUFFER_BASE(wrBuf) + sent,
                                       SSL_BUFFER_LEN(wrBuf) - sent);
                if (rv != SECSuccess) {
                    /* presumably a memory error, SEC_ERROR_NO_MEMORY */
                    goto loser;
                }
            }
        }
        wrBuf->len = 0;
        totalSent += written;
    }
    return totalSent;

loser:
    /* Don't leave bits of buffer lying around. */
    wrBuf->len = 0;
    return -1;
}

#define SSL3_PENDING_HIGH_WATER 1024

/* Attempt to send the content of "in" in an SSL application_data record.
 * Returns "len" or -1 on failure.
 */
int
ssl3_SendApplicationData(sslSocket *ss, const unsigned char *in,
                         PRInt32 len, PRInt32 flags)
{
    PRInt32 totalSent = 0;
    PRInt32 discarded = 0;
    PRBool splitNeeded = PR_FALSE;

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    /* These flags for internal use only */
    PORT_Assert(!(flags & ssl_SEND_FLAG_NO_RETRANSMIT));
    if (len < 0 || !in) {
        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
        return -1;
    }

    if (ss->pendingBuf.len > SSL3_PENDING_HIGH_WATER &&
        !ssl_SocketIsBlocking(ss)) {
        PORT_Assert(!ssl_SocketIsBlocking(ss));
        PORT_SetError(PR_WOULD_BLOCK_ERROR);
        return -1;
    }

    if (ss->appDataBuffered && len) {
        PORT_Assert(in[0] == (unsigned char)(ss->appDataBuffered));
        if (in[0] != (unsigned char)(ss->appDataBuffered)) {
            PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
            return -1;
        }
        in++;
        len--;
        discarded = 1;
    }

    /* We will split the first byte of the record into its own record, as
     * explained in the documentation for SSL_CBC_RANDOM_IV in ssl.h.
     */
    if (len > 1 && ss->opt.cbcRandomIV &&
        ss->version < SSL_LIBRARY_VERSION_TLS_1_1 &&
        ss->ssl3.cwSpec->cipherDef->type == type_block /* CBC */) {
        splitNeeded = PR_TRUE;
    }

    while (len > totalSent) {
        PRInt32 sent, toSend;

        if (totalSent > 0) {
            /*
             * The thread yield is intended to give the reader thread a
             * chance to get some cycles while the writer thread is in
             * the middle of a large application data write.  (See
             * Bugzilla bug 127740, comment #1.)
             */
            ssl_ReleaseXmitBufLock(ss);
            PR_Sleep(PR_INTERVAL_NO_WAIT); /* PR_Yield(); */
            ssl_GetXmitBufLock(ss);
        }

        if (splitNeeded) {
            toSend = 1;
            splitNeeded = PR_FALSE;
        } else {
            toSend = PR_MIN(len - totalSent, MAX_FRAGMENT_LENGTH);
        }

        /*
         * Note that the 0 epoch is OK because flags will never require
         * its use, as guaranteed by the PORT_Assert above.
         */
        sent = ssl3_SendRecord(ss, NULL, ssl_ct_application_data,
                               in + totalSent, toSend, flags);
        if (sent < 0) {
            if (totalSent > 0 && PR_GetError() == PR_WOULD_BLOCK_ERROR) {
                PORT_Assert(ss->lastWriteBlocked);
                break;
            }
            return -1; /* error code set by ssl3_SendRecord */
        }
        totalSent += sent;
        if (ss->pendingBuf.len) {
            /* must be a non-blocking socket */
            PORT_Assert(!ssl_SocketIsBlocking(ss));
            PORT_Assert(ss->lastWriteBlocked);
            break;
        }
    }
    if (ss->pendingBuf.len) {
        /* Must be non-blocking. */
        PORT_Assert(!ssl_SocketIsBlocking(ss));
        if (totalSent > 0) {
            ss->appDataBuffered = 0x100 | in[totalSent - 1];
        }

        totalSent = totalSent + discarded - 1;
        if (totalSent <= 0) {
            PORT_SetError(PR_WOULD_BLOCK_ERROR);
            totalSent = SECFailure;
        }
        return totalSent;
    }
    ss->appDataBuffered = 0;
    return totalSent + discarded;
}

/* Attempt to send buffered handshake messages.
 * Always set sendBuf.len to 0, even when returning SECFailure.
 *
 * Depending on whether we are doing DTLS or not, this either calls
 *
 * - ssl3_FlushHandshakeMessages if non-DTLS
 * - dtls_FlushHandshakeMessages if DTLS
 *
 * Called from SSL3_SendAlert(), ssl3_SendChangeCipherSpecs(),
 *             ssl3_AppendHandshake(), ssl3_SendClientHello(),
 *             ssl3_SendHelloRequest(), ssl3_SendServerHelloDone(),
 *             ssl3_SendFinished(),
 */
SECStatus
ssl3_FlushHandshake(sslSocket *ss, PRInt32 flags)
{
    if (IS_DTLS(ss)) {
        return dtls_FlushHandshakeMessages(ss, flags);
    }
    return ssl3_FlushHandshakeMessages(ss, flags);
}

/* Attempt to send the content of sendBuf buffer in an SSL handshake record.
 * Always set sendBuf.len to 0, even when returning SECFailure.
 *
 * Called from ssl3_FlushHandshake
 */
static SECStatus
ssl3_FlushHandshakeMessages(sslSocket *ss, PRInt32 flags)
{
    static const PRInt32 allowedFlags = ssl_SEND_FLAG_FORCE_INTO_BUFFER;
    PRInt32 count = -1;
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    if (!ss->sec.ci.sendBuf.buf || !ss->sec.ci.sendBuf.len)
        return SECSuccess;

    /* only these flags are allowed */
    PORT_Assert(!(flags & ~allowedFlags));
    if ((flags & ~allowedFlags) != 0) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    count = ssl3_SendRecord(ss, NULL, ssl_ct_handshake,
                            ss->sec.ci.sendBuf.buf,
                            ss->sec.ci.sendBuf.len, flags);
    if (count < 0) {
        int err = PORT_GetError();
        PORT_Assert(err != PR_WOULD_BLOCK_ERROR);
        if (err == PR_WOULD_BLOCK_ERROR) {
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        }
        rv = SECFailure;
    } else if ((unsigned int)count < ss->sec.ci.sendBuf.len) {
        /* short write should never happen */
        PORT_Assert((unsigned int)count >= ss->sec.ci.sendBuf.len);
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        rv = SECFailure;
    } else {
        rv = SECSuccess;
    }

    /* Whether we succeeded or failed, toss the old handshake data. */
    ss->sec.ci.sendBuf.len = 0;
    return rv;
}

/*
 * Called from ssl3_HandleAlert and from ssl3_HandleCertificate when
 * the remote client sends a negative response to our certificate request.
 * Returns SECFailure if the application has required client auth.
 *         SECSuccess otherwise.
 */
SECStatus
ssl3_HandleNoCertificate(sslSocket *ss)
{
    ssl3_CleanupPeerCerts(ss);

    /* If the server has required client-auth blindly but doesn't
     * actually look at the certificate it won't know that no
     * certificate was presented so we shutdown the socket to ensure
     * an error.  We only do this if we haven't already completed the
     * first handshake because if we're redoing the handshake we
     * know the server is paying attention to the certificate.
     */
    if ((ss->opt.requireCertificate == SSL_REQUIRE_ALWAYS) ||
        (!ss->firstHsDone &&
         (ss->opt.requireCertificate == SSL_REQUIRE_FIRST_HANDSHAKE))) {
        PRFileDesc *lower;

        ssl_UncacheSessionID(ss);

        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
            SSL3_SendAlert(ss, alert_fatal, certificate_required);
        } else {
            SSL3_SendAlert(ss, alert_fatal, bad_certificate);
        }

        lower = ss->fd->lower;
#ifdef _WIN32
        lower->methods->shutdown(lower, PR_SHUTDOWN_SEND);
#else
        lower->methods->shutdown(lower, PR_SHUTDOWN_BOTH);
#endif
        PORT_SetError(SSL_ERROR_NO_CERTIFICATE);
        return SECFailure;
    }
    return SECSuccess;
}

/************************************************************************
 * Alerts
 */

/*
** Acquires both handshake and XmitBuf locks.
** Called from: ssl3_IllegalParameter   <-
**              ssl3_HandshakeFailure   <-
**              ssl3_HandleAlert    <- ssl3_HandleRecord.
**              ssl3_HandleChangeCipherSpecs <- ssl3_HandleRecord
**              ssl3_ConsumeHandshakeVariable <-
**              ssl3_HandleHelloRequest <-
**              ssl3_HandleServerHello  <-
**              ssl3_HandleServerKeyExchange <-
**              ssl3_HandleCertificateRequest <-
**              ssl3_HandleServerHelloDone <-
**              ssl3_HandleClientHello  <-
**              ssl3_HandleV2ClientHello <-
**              ssl3_HandleCertificateVerify <-
**              ssl3_HandleClientKeyExchange <-
**              ssl3_HandleCertificate  <-
**              ssl3_HandleFinished <-
**              ssl3_HandleHandshakeMessage <-
**              ssl3_HandlePostHelloHandshakeMessage <-
**              ssl3_HandleRecord   <-
**
*/
SECStatus
SSL3_SendAlert(sslSocket *ss, SSL3AlertLevel level, SSL3AlertDescription desc)
{
    PRUint8 bytes[2];
    SECStatus rv;
    PRBool needHsLock = !ssl_HaveSSL3HandshakeLock(ss);

    /* Check that if I need the HS lock I also need the Xmit lock */
    PORT_Assert(!needHsLock || !ssl_HaveXmitBufLock(ss));

    SSL_TRC(3, ("%d: SSL3[%d]: send alert record, level=%d desc=%d",
                SSL_GETPID(), ss->fd, level, desc));

    bytes[0] = level;
    bytes[1] = desc;

    if (needHsLock) {
        ssl_GetSSL3HandshakeLock(ss);
    }
    if (level == alert_fatal) {
        if (ss->sec.ci.sid) {
            ssl_UncacheSessionID(ss);
        }
    }

    rv = tls13_SetAlertCipherSpec(ss);
    if (rv != SECSuccess) {
        if (needHsLock) {
            ssl_ReleaseSSL3HandshakeLock(ss);
        }
        return rv;
    }

    ssl_GetXmitBufLock(ss);
    rv = ssl3_FlushHandshake(ss, ssl_SEND_FLAG_FORCE_INTO_BUFFER);
    if (rv == SECSuccess) {
        PRInt32 sent;
        sent = ssl3_SendRecord(ss, NULL, ssl_ct_alert, bytes, 2,
                               (desc == no_certificate) ? ssl_SEND_FLAG_FORCE_INTO_BUFFER : 0);
        rv = (sent >= 0) ? SECSuccess : (SECStatus)sent;
    }
    if (level == alert_fatal) {
        ss->ssl3.fatalAlertSent = PR_TRUE;
    }
    ssl_ReleaseXmitBufLock(ss);
    if (needHsLock) {
        ssl_ReleaseSSL3HandshakeLock(ss);
    }
    if (rv == SECSuccess && ss->alertSentCallback) {
        SSLAlert alert = { level, desc };
        ss->alertSentCallback(ss->fd, ss->alertSentCallbackArg, &alert);
    }
    return rv; /* error set by ssl3_FlushHandshake or ssl3_SendRecord */
}

/*
 * Send illegal_parameter alert.  Set generic error number.
 */
static SECStatus
ssl3_IllegalParameter(sslSocket *ss)
{
    (void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
    PORT_SetError(ss->sec.isServer ? SSL_ERROR_BAD_CLIENT
                                   : SSL_ERROR_BAD_SERVER);
    return SECFailure;
}

/*
 * Send handshake_Failure alert.  Set generic error number.
 */
static SECStatus
ssl3_HandshakeFailure(sslSocket *ss)
{
    (void)SSL3_SendAlert(ss, alert_fatal, handshake_failure);
    PORT_SetError(ss->sec.isServer ? SSL_ERROR_BAD_CLIENT
                                   : SSL_ERROR_BAD_SERVER);
    return SECFailure;
}

void
ssl3_SendAlertForCertError(sslSocket *ss, PRErrorCode errCode)
{
    SSL3AlertDescription desc = bad_certificate;
    PRBool isTLS = ss->version >= SSL_LIBRARY_VERSION_3_1_TLS;

    switch (errCode) {
        case SEC_ERROR_LIBRARY_FAILURE:
            desc = unsupported_certificate;
            break;
        case SEC_ERROR_EXPIRED_CERTIFICATE:
            desc = certificate_expired;
            break;
        case SEC_ERROR_REVOKED_CERTIFICATE:
            desc = certificate_revoked;
            break;
        case SEC_ERROR_INADEQUATE_KEY_USAGE:
        case SEC_ERROR_INADEQUATE_CERT_TYPE:
            desc = certificate_unknown;
            break;
        case SEC_ERROR_UNTRUSTED_CERT:
            desc = isTLS ? access_denied : certificate_unknown;
            break;
        case SEC_ERROR_UNKNOWN_ISSUER:
        case SEC_ERROR_UNTRUSTED_ISSUER:
            desc = isTLS ? unknown_ca : certificate_unknown;
            break;
        case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
            desc = isTLS ? unknown_ca : certificate_expired;
            break;

        case SEC_ERROR_CERT_NOT_IN_NAME_SPACE:
        case SEC_ERROR_PATH_LEN_CONSTRAINT_INVALID:
        case SEC_ERROR_CA_CERT_INVALID:
        case SEC_ERROR_BAD_SIGNATURE:
        default:
            desc = bad_certificate;
            break;
    }
    SSL_DBG(("%d: SSL3[%d]: peer certificate is no good: error=%d",
             SSL_GETPID(), ss->fd, errCode));

    (void)SSL3_SendAlert(ss, alert_fatal, desc);
}

/*
 * Send decode_error alert.  Set generic error number.
 */
SECStatus
ssl3_DecodeError(sslSocket *ss)
{
    (void)SSL3_SendAlert(ss, alert_fatal,
                         ss->version > SSL_LIBRARY_VERSION_3_0 ? decode_error
                                                               : illegal_parameter);
    PORT_SetError(ss->sec.isServer ? SSL_ERROR_BAD_CLIENT
                                   : SSL_ERROR_BAD_SERVER);
    return SECFailure;
}

/* Called from ssl3_HandleRecord.
** Caller must hold both RecvBuf and Handshake locks.
*/
static SECStatus
ssl3_HandleAlert(sslSocket *ss, sslBuffer *buf)
{
    SSL3AlertLevel level;
    SSL3AlertDescription desc;
    int error;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    SSL_TRC(3, ("%d: SSL3[%d]: handle alert record", SSL_GETPID(), ss->fd));

    if (buf->len != 2) {
        (void)ssl3_DecodeError(ss);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_ALERT);
        return SECFailure;
    }
    level = (SSL3AlertLevel)buf->buf[0];
    desc = (SSL3AlertDescription)buf->buf[1];
    buf->len = 0;
    SSL_TRC(5, ("%d: SSL3[%d] received alert, level = %d, description = %d",
                SSL_GETPID(), ss->fd, level, desc));

    if (ss->alertReceivedCallback) {
        SSLAlert alert = { level, desc };
        ss->alertReceivedCallback(ss->fd, ss->alertReceivedCallbackArg, &alert);
    }

    switch (desc) {
        case close_notify:
            ss->recvdCloseNotify = 1;
            error = SSL_ERROR_CLOSE_NOTIFY_ALERT;
            break;
        case unexpected_message:
            error = SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT;
            break;
        case bad_record_mac:
            error = SSL_ERROR_BAD_MAC_ALERT;
            break;
        case decryption_failed_RESERVED:
            error = SSL_ERROR_DECRYPTION_FAILED_ALERT;
            break;
        case record_overflow:
            error = SSL_ERROR_RECORD_OVERFLOW_ALERT;
            break;
        case decompression_failure:
            error = SSL_ERROR_DECOMPRESSION_FAILURE_ALERT;
            break;
        case handshake_failure:
            error = SSL_ERROR_HANDSHAKE_FAILURE_ALERT;
            break;
        case no_certificate:
            error = SSL_ERROR_NO_CERTIFICATE;
            break;
        case certificate_required:
            error = SSL_ERROR_RX_CERTIFICATE_REQUIRED_ALERT;
            break;
        case bad_certificate:
            error = SSL_ERROR_BAD_CERT_ALERT;
            break;
        case unsupported_certificate:
            error = SSL_ERROR_UNSUPPORTED_CERT_ALERT;
            break;
        case certificate_revoked:
            error = SSL_ERROR_REVOKED_CERT_ALERT;
            break;
        case certificate_expired:
            error = SSL_ERROR_EXPIRED_CERT_ALERT;
            break;
        case certificate_unknown:
            error = SSL_ERROR_CERTIFICATE_UNKNOWN_ALERT;
            break;
        case illegal_parameter:
            error = SSL_ERROR_ILLEGAL_PARAMETER_ALERT;
            break;
        case inappropriate_fallback:
            error = SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT;
            break;

        /* All alerts below are TLS only. */
        case unknown_ca:
            error = SSL_ERROR_UNKNOWN_CA_ALERT;
            break;
        case access_denied:
            error = SSL_ERROR_ACCESS_DENIED_ALERT;
            break;
        case decode_error:
            error = SSL_ERROR_DECODE_ERROR_ALERT;
            break;
        case decrypt_error:
            error = SSL_ERROR_DECRYPT_ERROR_ALERT;
            break;
        case export_restriction:
            error = SSL_ERROR_EXPORT_RESTRICTION_ALERT;
            break;
        case protocol_version:
            error = SSL_ERROR_PROTOCOL_VERSION_ALERT;
            break;
        case insufficient_security:
            error = SSL_ERROR_INSUFFICIENT_SECURITY_ALERT;
            break;
        case internal_error:
            error = SSL_ERROR_INTERNAL_ERROR_ALERT;
            break;
        case user_canceled:
            error = SSL_ERROR_USER_CANCELED_ALERT;
            break;
        case no_renegotiation:
            error = SSL_ERROR_NO_RENEGOTIATION_ALERT;
            break;

        /* Alerts for TLS client hello extensions */
        case missing_extension:
            error = SSL_ERROR_MISSING_EXTENSION_ALERT;
            break;
        case unsupported_extension:
            error = SSL_ERROR_UNSUPPORTED_EXTENSION_ALERT;
            break;
        case certificate_unobtainable:
            error = SSL_ERROR_CERTIFICATE_UNOBTAINABLE_ALERT;
            break;
        case unrecognized_name:
            error = SSL_ERROR_UNRECOGNIZED_NAME_ALERT;
            break;
        case bad_certificate_status_response:
            error = SSL_ERROR_BAD_CERT_STATUS_RESPONSE_ALERT;
            break;
        case bad_certificate_hash_value:
            error = SSL_ERROR_BAD_CERT_HASH_VALUE_ALERT;
            break;
        case no_application_protocol:
            error = SSL_ERROR_NEXT_PROTOCOL_NO_PROTOCOL;
            break;
        case ech_required:
            error = SSL_ERROR_ECH_REQUIRED_ALERT;
            break;
        default:
            error = SSL_ERROR_RX_UNKNOWN_ALERT;
            break;
    }
    if ((ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) &&
        (ss->ssl3.hs.ws != wait_server_hello)) {
        /* TLS 1.3 requires all but "end of data" alerts to be
         * treated as fatal. */
        switch (desc) {
            case close_notify:
            case user_canceled:
                break;
            default:
                level = alert_fatal;
        }
    }
    if (level == alert_fatal) {
        ssl_UncacheSessionID(ss);
        if ((ss->ssl3.hs.ws == wait_server_hello) &&
            (desc == handshake_failure)) {
            /* XXX This is a hack.  We're assuming that any handshake failure
             * XXX on the client hello is a failure to match ciphers.
             */
            error = SSL_ERROR_NO_CYPHER_OVERLAP;
        }
        PORT_SetError(error);
        return SECFailure;
    }
    if ((desc == no_certificate) && (ss->ssl3.hs.ws == wait_client_cert)) {
        /* I'm a server. I've requested a client cert. He hasn't got one. */
        SECStatus rv;

        PORT_Assert(ss->sec.isServer);
        ss->ssl3.hs.ws = wait_client_key;
        rv = ssl3_HandleNoCertificate(ss);
        return rv;
    }
    return SECSuccess;
}

/*
 * Change Cipher Specs
 * Called from ssl3_HandleServerHelloDone,
 *             ssl3_HandleClientHello,
 * and         ssl3_HandleFinished
 *
 * Acquires and releases spec write lock, to protect switching the current
 * and pending write spec pointers.
 */

SECStatus
ssl3_SendChangeCipherSpecsInt(sslSocket *ss)
{
    PRUint8 change = change_cipher_spec_choice;
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: send change_cipher_spec record",
                SSL_GETPID(), ss->fd));

    rv = ssl3_FlushHandshake(ss, ssl_SEND_FLAG_FORCE_INTO_BUFFER);
    if (rv != SECSuccess) {
        return SECFailure; /* error code set by ssl3_FlushHandshake */
    }

    if (!IS_DTLS(ss)) {
        PRInt32 sent;
        sent = ssl3_SendRecord(ss, NULL, ssl_ct_change_cipher_spec,
                               &change, 1, ssl_SEND_FLAG_FORCE_INTO_BUFFER);
        if (sent < 0) {
            return SECFailure; /* error code set by ssl3_SendRecord */
        }
    } else {
        rv = dtls_QueueMessage(ss, ssl_ct_change_cipher_spec, &change, 1);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }
    return SECSuccess;
}

static SECStatus
ssl3_SendChangeCipherSpecs(sslSocket *ss)
{
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    rv = ssl3_SendChangeCipherSpecsInt(ss);
    if (rv != SECSuccess) {
        return rv; /* Error code set. */
    }

    /* swap the pending and current write specs. */
    ssl_GetSpecWriteLock(ss); /**************************************/

    ssl_CipherSpecRelease(ss->ssl3.cwSpec);
    ss->ssl3.cwSpec = ss->ssl3.pwSpec;
    ss->ssl3.pwSpec = NULL;

    SSL_TRC(3, ("%d: SSL3[%d] Set Current Write Cipher Suite to Pending",
                SSL_GETPID(), ss->fd));

    /* With DTLS, we need to set a holddown timer in case the final
     * message got lost */
    if (IS_DTLS(ss) && ss->ssl3.crSpec->epoch == ss->ssl3.cwSpec->epoch) {
        rv = dtls_StartHolddownTimer(ss);
    }
    ssl_ReleaseSpecWriteLock(ss); /**************************************/

    return rv;
}

/* Called from ssl3_HandleRecord.
** Caller must hold both RecvBuf and Handshake locks.
 *
 * Acquires and releases spec write lock, to protect switching the current
 * and pending write spec pointers.
*/
static SECStatus
ssl3_HandleChangeCipherSpecs(sslSocket *ss, sslBuffer *buf)
{
    SSL3WaitState ws = ss->ssl3.hs.ws;
    SSL3ChangeCipherSpecChoice change;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    SSL_TRC(3, ("%d: SSL3[%d]: handle change_cipher_spec record",
                SSL_GETPID(), ss->fd));

    /* For DTLS: Ignore this if we aren't expecting it.  Don't kill a connection
     *           as a result of receiving trash.
     * For TLS: Maybe ignore, but only after checking format. */
    if (ws != wait_change_cipher && IS_DTLS(ss)) {
        /* Ignore this because it's out of order. */
        SSL_TRC(3, ("%d: SSL3[%d]: discard out of order "
                    "DTLS change_cipher_spec",
                    SSL_GETPID(), ss->fd));
        buf->len = 0;
        return SECSuccess;
    }

    /* Handshake messages should not span ChangeCipherSpec. */
    if (ss->ssl3.hs.header_bytes) {
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER);
        return SECFailure;
    }
    if (buf->len != 1) {
        (void)ssl3_DecodeError(ss);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
        return SECFailure;
    }
    change = (SSL3ChangeCipherSpecChoice)buf->buf[0];
    if (change != change_cipher_spec_choice) {
        /* illegal_parameter is correct here for both SSL3 and TLS. */
        (void)ssl3_IllegalParameter(ss);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
        return SECFailure;
    }

    buf->len = 0;
    if (ws != wait_change_cipher) {
        /* Ignore a CCS for TLS 1.3. This only happens if the server sends a
         * HelloRetryRequest.  In other cases, the CCS will fail decryption and
         * will be discarded by ssl3_HandleRecord(). */
        if (ws == wait_server_hello &&
            ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
            ss->ssl3.hs.helloRetry) {
            PORT_Assert(!ss->sec.isServer);
            return SECSuccess;
        }
        /* Note: For a server, we can't test ss->ssl3.hs.helloRetry or
         * ss->version because the server might be stateless (and so it won't
         * have set either value yet). Set a flag so that at least we will
         * guarantee that the server will treat any ClientHello properly. */
        if (ws == wait_client_hello &&
            ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3 &&
            !ss->ssl3.hs.receivedCcs) {
            PORT_Assert(ss->sec.isServer);
            ss->ssl3.hs.receivedCcs = PR_TRUE;
            return SECSuccess;
        }
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER);
        return SECFailure;
    }

    SSL_TRC(3, ("%d: SSL3[%d] Set Current Read Cipher Suite to Pending",
                SSL_GETPID(), ss->fd));
    ssl_GetSpecWriteLock(ss); /*************************************/
    PORT_Assert(ss->ssl3.prSpec);
    ssl_CipherSpecRelease(ss->ssl3.crSpec);
    ss->ssl3.crSpec = ss->ssl3.prSpec;
    ss->ssl3.prSpec = NULL;
    ssl_ReleaseSpecWriteLock(ss); /*************************************/

    ss->ssl3.hs.ws = wait_finished;
    return SECSuccess;
}

static CK_MECHANISM_TYPE
ssl3_GetMgfMechanismByHashType(SSLHashType hash)
{
    switch (hash) {
        case ssl_hash_sha256:
            return CKG_MGF1_SHA256;
        case ssl_hash_sha384:
            return CKG_MGF1_SHA384;
        case ssl_hash_sha512:
            return CKG_MGF1_SHA512;
        default:
            PORT_Assert(0);
    }
    return CKG_MGF1_SHA256;
}

/* Function valid for >= TLS 1.2, only. */
static CK_MECHANISM_TYPE
ssl3_GetHashMechanismByHashType(SSLHashType hashType)
{
    switch (hashType) {
        case ssl_hash_sha512:
            return CKM_SHA512;
        case ssl_hash_sha384:
            return CKM_SHA384;
        case ssl_hash_sha256:
        case ssl_hash_none:
            /* ssl_hash_none is for pre-1.2 suites, which use SHA-256. */
            return CKM_SHA256;
        case ssl_hash_sha1:
            return CKM_SHA_1;
        default:
            PORT_Assert(0);
    }
    return CKM_SHA256;
}

/* Function valid for >= TLS 1.2, only. */
static CK_MECHANISM_TYPE
ssl3_GetPrfHashMechanism(sslSocket *ss)
{
    return ssl3_GetHashMechanismByHashType(ss->ssl3.hs.suite_def->prf_hash);
}

static SSLHashType
ssl3_GetSuitePrfHash(sslSocket *ss)
{
    /* ssl_hash_none is for pre-1.2 suites, which use SHA-256. */
    if (ss->ssl3.hs.suite_def->prf_hash == ssl_hash_none) {
        return ssl_hash_sha256;
    }
    return ss->ssl3.hs.suite_def->prf_hash;
}

/* This method completes the derivation of the MS from the PMS.
**
** 1. Derive the MS, if possible, else return an error.
**
** 2. Check the version if |pms_version| is non-zero and if wrong,
**    return an error.
**
** 3. If |msp| is nonzero, return MS in |*msp|.

** Called from:
**   ssl3_ComputeMasterSecretInt
**   tls_ComputeExtendedMasterSecretInt
*/
static SECStatus
ssl3_ComputeMasterSecretFinish(sslSocket *ss,
                               CK_MECHANISM_TYPE master_derive,
                               CK_MECHANISM_TYPE key_derive,
                               CK_VERSION *pms_version,
                               SECItem *params, CK_FLAGS keyFlags,
                               PK11SymKey *pms, PK11SymKey **msp)
{
    PK11SymKey *ms = NULL;

    ms = PK11_DeriveWithFlags(pms, master_derive,
                              params, key_derive,
                              CKA_DERIVE, 0, keyFlags);
    if (!ms) {
        ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
        return SECFailure;
    }

    if (pms_version && ss->opt.detectRollBack) {
        SSL3ProtocolVersion client_version;
        client_version = pms_version->major << 8 | pms_version->minor;

        if (IS_DTLS(ss)) {
            client_version = dtls_DTLSVersionToTLSVersion(client_version);
        }

        if (client_version != ss->clientHelloVersion) {
            /* Destroy MS.  Version roll-back detected. */
            PK11_FreeSymKey(ms);
            ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
            return SECFailure;
        }
    }

    if (msp) {
        *msp = ms;
    } else {
        PK11_FreeSymKey(ms);
    }

    return SECSuccess;
}

/*  Compute the ordinary (pre draft-ietf-tls-session-hash) master
 ** secret and return it in |*msp|.
 **
 ** Called from: ssl3_ComputeMasterSecret
 */
static SECStatus
ssl3_ComputeMasterSecretInt(sslSocket *ss, PK11SymKey *pms,
                            PK11SymKey **msp)
{
    PRBool isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);
    PRBool isTLS12 = (PRBool)(ss->version >= SSL_LIBRARY_VERSION_TLS_1_2);
    /*
     * Whenever isDH is true, we need to use CKM_TLS_MASTER_KEY_DERIVE_DH
     * which, unlike CKM_TLS_MASTER_KEY_DERIVE, converts arbitrary size
     * data into a 48-byte value, and does not expect to return the version.
     */
    PRBool isDH = (PRBool)((ss->ssl3.hs.kea_def->exchKeyType == ssl_kea_dh) ||
                           (ss->ssl3.hs.kea_def->exchKeyType == ssl_kea_ecdh));
    CK_MECHANISM_TYPE master_derive;
    CK_MECHANISM_TYPE key_derive;
    SECItem params;
    CK_FLAGS keyFlags;
    CK_VERSION pms_version;
    CK_VERSION *pms_version_ptr = NULL;
    /* master_params may be used as a CK_SSL3_MASTER_KEY_DERIVE_PARAMS */
    CK_TLS12_MASTER_KEY_DERIVE_PARAMS master_params;
    unsigned int master_params_len;

    if (isTLS12) {
        if (isDH)
            master_derive = CKM_TLS12_MASTER_KEY_DERIVE_DH;
        else
            master_derive = CKM_TLS12_MASTER_KEY_DERIVE;
        key_derive = CKM_TLS12_KEY_AND_MAC_DERIVE;
        keyFlags = CKF_SIGN | CKF_VERIFY;
    } else if (isTLS) {
        if (isDH)
            master_derive = CKM_TLS_MASTER_KEY_DERIVE_DH;
        else
            master_derive = CKM_TLS_MASTER_KEY_DERIVE;
        key_derive = CKM_TLS_KEY_AND_MAC_DERIVE;
        keyFlags = CKF_SIGN | CKF_VERIFY;
    } else {
        if (isDH)
            master_derive = CKM_SSL3_MASTER_KEY_DERIVE_DH;
        else
            master_derive = CKM_SSL3_MASTER_KEY_DERIVE;
        key_derive = CKM_SSL3_KEY_AND_MAC_DERIVE;
        keyFlags = 0;
    }

    if (!isDH) {
        pms_version_ptr = &pms_version;
    }

    master_params.pVersion = pms_version_ptr;
    master_params.RandomInfo.pClientRandom = ss->ssl3.hs.client_random;
    master_params.RandomInfo.ulClientRandomLen = SSL3_RANDOM_LENGTH;
    master_params.RandomInfo.pServerRandom = ss->ssl3.hs.server_random;
    master_params.RandomInfo.ulServerRandomLen = SSL3_RANDOM_LENGTH;
    if (isTLS12) {
        master_params.prfHashMechanism = ssl3_GetPrfHashMechanism(ss);
        master_params_len = sizeof(CK_TLS12_MASTER_KEY_DERIVE_PARAMS);
    } else {
        /* prfHashMechanism is not relevant with this PRF */
        master_params_len = sizeof(CK_SSL3_MASTER_KEY_DERIVE_PARAMS);
    }

    params.data = (unsigned char *)&master_params;
    params.len = master_params_len;

    return ssl3_ComputeMasterSecretFinish(ss, master_derive, key_derive,
                                          pms_version_ptr, &params,
                                          keyFlags, pms, msp);
}

/* Compute the draft-ietf-tls-session-hash master
** secret and return it in |*msp|.
**
** Called from: ssl3_ComputeMasterSecret
*/
static SECStatus
tls_ComputeExtendedMasterSecretInt(sslSocket *ss, PK11SymKey *pms,
                                   PK11SymKey **msp)
{
    ssl3CipherSpec *pwSpec = ss->ssl3.pwSpec;
    CK_NSS_TLS_EXTENDED_MASTER_KEY_DERIVE_PARAMS extended_master_params;
    SSL3Hashes hashes;
    /*
     * Determine whether to use the DH/ECDH or RSA derivation modes.
     */
    /*
     * TODO(ekr@rtfm.com): Verify that the slot can handle this key expansion
     * mode. Bug 1198298 */
    PRBool isDH = (PRBool)((ss->ssl3.hs.kea_def->exchKeyType == ssl_kea_dh) ||
                           (ss->ssl3.hs.kea_def->exchKeyType == ssl_kea_ecdh));
    CK_MECHANISM_TYPE master_derive;
    CK_MECHANISM_TYPE key_derive;
    SECItem params;
    const CK_FLAGS keyFlags = CKF_SIGN | CKF_VERIFY;
    CK_VERSION pms_version;
    CK_VERSION *pms_version_ptr = NULL;
    SECStatus rv;

    rv = ssl3_ComputeHandshakeHashes(ss, pwSpec, &hashes, 0);
    if (rv != SECSuccess) {
        PORT_Assert(0); /* Should never fail */
        ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
        return SECFailure;
    }

    if (isDH) {
        master_derive = CKM_NSS_TLS_EXTENDED_MASTER_KEY_DERIVE_DH;
    } else {
        master_derive = CKM_NSS_TLS_EXTENDED_MASTER_KEY_DERIVE;
        pms_version_ptr = &pms_version;
    }

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        /* TLS 1.2+ */
        extended_master_params.prfHashMechanism = ssl3_GetPrfHashMechanism(ss);
        key_derive = CKM_TLS12_KEY_AND_MAC_DERIVE;
    } else {
        /* TLS < 1.2 */
        extended_master_params.prfHashMechanism = CKM_TLS_PRF;
        key_derive = CKM_TLS_KEY_AND_MAC_DERIVE;
    }

    extended_master_params.pVersion = pms_version_ptr;
    extended_master_params.pSessionHash = hashes.u.raw;
    extended_master_params.ulSessionHashLen = hashes.len;

    params.data = (unsigned char *)&extended_master_params;
    params.len = sizeof extended_master_params;

    return ssl3_ComputeMasterSecretFinish(ss, master_derive, key_derive,
                                          pms_version_ptr, &params,
                                          keyFlags, pms, msp);
}

/* Wrapper method to compute the master secret and return it in |*msp|.
**
** Called from ssl3_ComputeMasterSecret
*/
static SECStatus
ssl3_ComputeMasterSecret(sslSocket *ss, PK11SymKey *pms,
                         PK11SymKey **msp)
{
    PORT_Assert(pms != NULL);
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn)) {
        return tls_ComputeExtendedMasterSecretInt(ss, pms, msp);
    } else {
        return ssl3_ComputeMasterSecretInt(ss, pms, msp);
    }
}

/*
 * Derive encryption and MAC Keys (and IVs) from master secret
 * Sets a useful error code when returning SECFailure.
 *
 * Called only from ssl3_InitPendingCipherSpec(),
 * which in turn is called from
 *              ssl3_SendRSAClientKeyExchange    (for Full handshake)
 *              ssl3_SendDHClientKeyExchange     (for Full handshake)
 *              ssl3_HandleClientKeyExchange    (for Full handshake)
 *              ssl3_HandleServerHello          (for session restart)
 *              ssl3_HandleClientHello          (for session restart)
 * Caller MUST hold the specWriteLock, and SSL3HandshakeLock.
 * ssl3_InitPendingCipherSpec does that.
 *
 */
static SECStatus
ssl3_DeriveConnectionKeys(sslSocket *ss, PK11SymKey *masterSecret)
{
    ssl3CipherSpec *pwSpec = ss->ssl3.pwSpec;
    ssl3CipherSpec *prSpec = ss->ssl3.prSpec;
    ssl3CipherSpec *clientSpec;
    ssl3CipherSpec *serverSpec;
    PRBool isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);
    PRBool isTLS12 =
        (PRBool)(isTLS && ss->version >= SSL_LIBRARY_VERSION_TLS_1_2);
    const ssl3BulkCipherDef *cipher_def = pwSpec->cipherDef;
    PK11SlotInfo *slot = NULL;
    PK11SymKey *derivedKeyHandle = NULL;
    void *pwArg = ss->pkcs11PinArg;
    int keySize;
    CK_TLS12_KEY_MAT_PARAMS key_material_params; /* may be used as a
                                                  * CK_SSL3_KEY_MAT_PARAMS */
    unsigned int key_material_params_len;
    CK_SSL3_KEY_MAT_OUT returnedKeys;
    CK_MECHANISM_TYPE key_derive;
    CK_MECHANISM_TYPE bulk_mechanism;
    SSLCipherAlgorithm calg;
    SECItem params;
    PRBool skipKeysAndIVs = (PRBool)(cipher_def->calg == ssl_calg_null);

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSpecWriteLock(ss));
    PORT_Assert(masterSecret);

    /* These functions operate in terms of who is writing specs. */
    if (ss->sec.isServer) {
        clientSpec = prSpec;
        serverSpec = pwSpec;
    } else {
        clientSpec = pwSpec;
        serverSpec = prSpec;
    }

    /*
     * generate the key material
     */
    if (cipher_def->type == type_block &&
        ss->version >= SSL_LIBRARY_VERSION_TLS_1_1) {
        /* Block ciphers in >= TLS 1.1 use a per-record, explicit IV. */
        key_material_params.ulIVSizeInBits = 0;
        PORT_Memset(clientSpec->keyMaterial.iv, 0, cipher_def->iv_size);
        PORT_Memset(serverSpec->keyMaterial.iv, 0, cipher_def->iv_size);
    }

    key_material_params.bIsExport = PR_FALSE;
    key_material_params.RandomInfo.pClientRandom = ss->ssl3.hs.client_random;
    key_material_params.RandomInfo.ulClientRandomLen = SSL3_RANDOM_LENGTH;
    key_material_params.RandomInfo.pServerRandom = ss->ssl3.hs.server_random;
    key_material_params.RandomInfo.ulServerRandomLen = SSL3_RANDOM_LENGTH;
    key_material_params.pReturnedKeyMaterial = &returnedKeys;

    if (skipKeysAndIVs) {
        keySize = 0;
        returnedKeys.pIVClient = NULL;
        returnedKeys.pIVServer = NULL;
        key_material_params.ulKeySizeInBits = 0;
        key_material_params.ulIVSizeInBits = 0;
    } else {
        keySize = cipher_def->key_size;
        returnedKeys.pIVClient = clientSpec->keyMaterial.iv;
        returnedKeys.pIVServer = serverSpec->keyMaterial.iv;
        key_material_params.ulKeySizeInBits = cipher_def->secret_key_size * BPB;
        key_material_params.ulIVSizeInBits = cipher_def->iv_size * BPB;
    }
    key_material_params.ulMacSizeInBits = pwSpec->macDef->mac_size * BPB;

    calg = cipher_def->calg;
    bulk_mechanism = ssl3_Alg2Mech(calg);

    if (isTLS12) {
        key_derive = CKM_TLS12_KEY_AND_MAC_DERIVE;
        key_material_params.prfHashMechanism = ssl3_GetPrfHashMechanism(ss);
        key_material_params_len = sizeof(CK_TLS12_KEY_MAT_PARAMS);
    } else if (isTLS) {
        key_derive = CKM_TLS_KEY_AND_MAC_DERIVE;
        key_material_params_len = sizeof(CK_SSL3_KEY_MAT_PARAMS);
    } else {
        key_derive = CKM_SSL3_KEY_AND_MAC_DERIVE;
        key_material_params_len = sizeof(CK_SSL3_KEY_MAT_PARAMS);
    }

    params.data = (unsigned char *)&key_material_params;
    params.len = key_material_params_len;

    /* CKM_SSL3_KEY_AND_MAC_DERIVE is defined to set ENCRYPT, DECRYPT, and
     * DERIVE by DEFAULT */
    derivedKeyHandle = PK11_Derive(masterSecret, key_derive, &params,
                                   bulk_mechanism, CKA_ENCRYPT, keySize);
    if (!derivedKeyHandle) {
        ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
        return SECFailure;
    }
    /* we really should use the actual mac'ing mechanism here, but we
     * don't because these types are used to map keytype anyway and both
     * mac's map to the same keytype.
     */
    slot = PK11_GetSlotFromKey(derivedKeyHandle);

    PK11_FreeSlot(slot); /* slot is held until the key is freed */
    clientSpec->keyMaterial.macKey =
        PK11_SymKeyFromHandle(slot, derivedKeyHandle, PK11_OriginDerive,
                              CKM_SSL3_SHA1_MAC, returnedKeys.hClientMacSecret,
                              PR_TRUE, pwArg);
    if (clientSpec->keyMaterial.macKey == NULL) {
        goto loser; /* loser sets err */
    }
    serverSpec->keyMaterial.macKey =
        PK11_SymKeyFromHandle(slot, derivedKeyHandle, PK11_OriginDerive,
                              CKM_SSL3_SHA1_MAC, returnedKeys.hServerMacSecret,
                              PR_TRUE, pwArg);
    if (serverSpec->keyMaterial.macKey == NULL) {
        goto loser; /* loser sets err */
    }
    if (!skipKeysAndIVs) {
        clientSpec->keyMaterial.key =
            PK11_SymKeyFromHandle(slot, derivedKeyHandle, PK11_OriginDerive,
                                  bulk_mechanism, returnedKeys.hClientKey,
                                  PR_TRUE, pwArg);
        if (clientSpec->keyMaterial.key == NULL) {
            goto loser; /* loser sets err */
        }
        serverSpec->keyMaterial.key =
            PK11_SymKeyFromHandle(slot, derivedKeyHandle, PK11_OriginDerive,
                                  bulk_mechanism, returnedKeys.hServerKey,
                                  PR_TRUE, pwArg);
        if (serverSpec->keyMaterial.key == NULL) {
            goto loser; /* loser sets err */
        }
    }
    PK11_FreeSymKey(derivedKeyHandle);
    return SECSuccess;

loser:
    PK11_FreeSymKey(derivedKeyHandle);
    ssl_MapLowLevelError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
    return SECFailure;
}

void
ssl3_CoalesceEchHandshakeHashes(sslSocket *ss)
{
    /* |sha| contains the CHOuter transcript, which is the singular
     * transcript if not doing ECH. If the server responded with 1.2,
     * contexts are not yet initialized. */
    if (ss->ssl3.hs.echAccepted) {
        if (ss->ssl3.hs.sha) {
            PORT_Assert(ss->ssl3.hs.shaEchInner);
            PK11_DestroyContext(ss->ssl3.hs.sha, PR_TRUE);
            ss->ssl3.hs.sha = ss->ssl3.hs.shaEchInner;
            ss->ssl3.hs.shaEchInner = NULL;
        }
    } else {
        if (ss->ssl3.hs.shaEchInner) {
            PK11_DestroyContext(ss->ssl3.hs.shaEchInner, PR_TRUE);
            ss->ssl3.hs.shaEchInner = NULL;
        }
    }
}

/* ssl3_InitHandshakeHashes creates handshake hash contexts and hashes in
 * buffered messages in ss->ssl3.hs.messages. Called from
 * ssl3_NegotiateCipherSuite(), tls13_HandleClientHelloPart2(),
 * and ssl3_HandleServerHello. */
SECStatus
ssl3_InitHandshakeHashes(sslSocket *ss)
{
    SSL_TRC(30, ("%d: SSL3[%d]: start handshake hashes", SSL_GETPID(), ss->fd));

    PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_unknown);
    if (ss->version == SSL_LIBRARY_VERSION_TLS_1_2) {
        ss->ssl3.hs.hashType = handshake_hash_record;
    } else {
        PORT_Assert(!ss->ssl3.hs.md5 && !ss->ssl3.hs.sha);
        /*
         * note: We should probably lookup an SSL3 slot for these
         * handshake hashes in hopes that we wind up with the same slots
         * that the master secret will wind up in ...
         */
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
            /* determine the hash from the prf */
            const SECOidData *hash_oid =
                SECOID_FindOIDByMechanism(ssl3_GetPrfHashMechanism(ss));

            /* Get the PKCS #11 mechanism for the Hash from the cipher suite (prf_hash)
             * Convert that to the OidTag. We can then use that OidTag to create our
             * PK11Context */
            PORT_Assert(hash_oid != NULL);
            if (hash_oid == NULL) {
                ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                return SECFailure;
            }

            ss->ssl3.hs.sha = PK11_CreateDigestContext(hash_oid->offset);
            if (ss->ssl3.hs.sha == NULL) {
                ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                return SECFailure;
            }
            ss->ssl3.hs.hashType = handshake_hash_single;
            if (PK11_DigestBegin(ss->ssl3.hs.sha) != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                return SECFailure;
            }

            /* Transcript hash used on ECH client. */
            if (!ss->sec.isServer && ss->ssl3.hs.echHpkeCtx) {
                ss->ssl3.hs.shaEchInner = PK11_CreateDigestContext(hash_oid->offset);
                if (ss->ssl3.hs.shaEchInner == NULL) {
                    ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                    return SECFailure;
                }
                if (PK11_DigestBegin(ss->ssl3.hs.shaEchInner) != SECSuccess) {
                    ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                    return SECFailure;
                }
            }
        } else {
            /* Both ss->ssl3.hs.md5 and ss->ssl3.hs.sha should be NULL or
             * created successfully. */
            ss->ssl3.hs.md5 = PK11_CreateDigestContext(SEC_OID_MD5);
            if (ss->ssl3.hs.md5 == NULL) {
                ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
                return SECFailure;
            }
            ss->ssl3.hs.sha = PK11_CreateDigestContext(SEC_OID_SHA1);
            if (ss->ssl3.hs.sha == NULL) {
                PK11_DestroyContext(ss->ssl3.hs.md5, PR_TRUE);
                ss->ssl3.hs.md5 = NULL;
                ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                return SECFailure;
            }
            ss->ssl3.hs.hashType = handshake_hash_combo;

            if (PK11_DigestBegin(ss->ssl3.hs.md5) != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
                return SECFailure;
            }
            if (PK11_DigestBegin(ss->ssl3.hs.sha) != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                return SECFailure;
            }
        }
    }

    if (ss->ssl3.hs.hashType != handshake_hash_record &&
        ss->ssl3.hs.messages.len > 0) {
        /* When doing ECH, ssl3_UpdateHandshakeHashes will store outer messages
         * into the both the outer and inner transcripts.
         * ssl3_UpdateDefaultHandshakeHashes uses the default context which is
         * the outer when doing client ECH. For ECH shared-mode or backend
         * servers only the hs.messages buffer is used. */
        if (ssl3_UpdateDefaultHandshakeHashes(ss, ss->ssl3.hs.messages.buf,
                                              ss->ssl3.hs.messages.len) != SECSuccess) {
            return SECFailure;
        }
        /* When doing ECH, deriving the accept_confirmation value requires all
         * messages up to and including the ServerHello
         * (see draft-ietf-tls-esni-14, Section 7.2).
         *
         * Don't free the transcript buffer until confirmation calculation. */
        if (!ss->ssl3.hs.echHpkeCtx && !ss->opt.enableTls13BackendEch) {
            sslBuffer_Clear(&ss->ssl3.hs.messages);
        }
    }
    if (ss->ssl3.hs.shaEchInner &&
        ss->ssl3.hs.echInnerMessages.len > 0) {
        if (PK11_DigestOp(ss->ssl3.hs.shaEchInner, ss->ssl3.hs.echInnerMessages.buf,
                          ss->ssl3.hs.echInnerMessages.len) != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
            return SECFailure;
        }
        if (!ss->ssl3.hs.echHpkeCtx) {
            sslBuffer_Clear(&ss->ssl3.hs.echInnerMessages);
        }
    }

    return SECSuccess;
}

void
ssl3_RestartHandshakeHashes(sslSocket *ss)
{
    SSL_TRC(30, ("%d: SSL3[%d]: reset handshake hashes",
                 SSL_GETPID(), ss->fd));
    ss->ssl3.hs.hashType = handshake_hash_unknown;
    ss->ssl3.hs.messages.len = 0;
    ss->ssl3.hs.echInnerMessages.len = 0;
    if (ss->ssl3.hs.md5) {
        PK11_DestroyContext(ss->ssl3.hs.md5, PR_TRUE);
        ss->ssl3.hs.md5 = NULL;
    }
    if (ss->ssl3.hs.sha) {
        PK11_DestroyContext(ss->ssl3.hs.sha, PR_TRUE);
        ss->ssl3.hs.sha = NULL;
    }
    if (ss->ssl3.hs.shaEchInner) {
        PK11_DestroyContext(ss->ssl3.hs.shaEchInner, PR_TRUE);
        ss->ssl3.hs.shaEchInner = NULL;
    }
    if (ss->ssl3.hs.shaPostHandshake) {
        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
        ss->ssl3.hs.shaPostHandshake = NULL;
    }
}

/* Add the provided bytes to the handshake hash context. When doing
 * TLS 1.3 ECH, |target| may be provided to specify only the inner/outer
 * transcript, else the input is added to both contexts. This happens
 * only on the client. On the server, only the default context is used. */
SECStatus
ssl3_UpdateHandshakeHashesInt(sslSocket *ss, const unsigned char *b,
                              unsigned int l, sslBuffer *target)
{

    SECStatus rv = SECSuccess;
    PRBool explicit = (target != NULL);
    PRBool appendToEchInner = !ss->sec.isServer &&
                              ss->ssl3.hs.echHpkeCtx &&
                              !explicit;
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(target != &ss->ssl3.hs.echInnerMessages ||
                !ss->sec.isServer);

    if (target == NULL) {
        /* Default context. */
        target = &ss->ssl3.hs.messages;
    }
    /* With TLS 1.3, and versions TLS.1.1 and older, we keep the hash(es)
     * always up to date. However, we must initially buffer the handshake
     * messages, until we know what to do.
     * If ss->ssl3.hs.hashType != handshake_hash_unknown,
     * it means we know what to do. We calculate (hash our input),
     * and we stop appending to the buffer.
     *
     * With TLS 1.2, we always append all handshake messages,
     * and never update the hash, because the hash function we must use for
     * certificate_verify might be different from the hash function we use
     * when signing other handshake hashes. */
    if (ss->ssl3.hs.hashType == handshake_hash_unknown ||
        ss->ssl3.hs.hashType == handshake_hash_record) {
        rv = sslBuffer_Append(target, b, l);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        if (appendToEchInner) {
            return sslBuffer_Append(&ss->ssl3.hs.echInnerMessages, b, l);
        }
        return SECSuccess;
    }

    PRINT_BUF(90, (ss, "handshake hash input:", b, l));

    if (ss->ssl3.hs.hashType == handshake_hash_single) {
        PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
        if (target == &ss->ssl3.hs.messages) {
            rv = PK11_DigestOp(ss->ssl3.hs.sha, b, l);
            if (rv != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                return rv;
            }
        }
        if (ss->ssl3.hs.shaEchInner &&
            (target == &ss->ssl3.hs.echInnerMessages || !explicit)) {
            rv = PK11_DigestOp(ss->ssl3.hs.shaEchInner, b, l);
            if (rv != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                return rv;
            }
        }
    } else if (ss->ssl3.hs.hashType == handshake_hash_combo) {
        rv = PK11_DigestOp(ss->ssl3.hs.md5, b, l);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
            return rv;
        }
        rv = PK11_DigestOp(ss->ssl3.hs.sha, b, l);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
            return rv;
        }
    }
    return rv;
}

static SECStatus
ssl3_UpdateDefaultHandshakeHashes(sslSocket *ss, const unsigned char *b,
                                  unsigned int l)
{
    return ssl3_UpdateHandshakeHashesInt(ss, b, l,
                                         &ss->ssl3.hs.messages);
}

static SECStatus
ssl3_UpdateInnerHandshakeHashes(sslSocket *ss, const unsigned char *b,
                                unsigned int l)
{
    return ssl3_UpdateHandshakeHashesInt(ss, b, l,
                                         &ss->ssl3.hs.echInnerMessages);
}

/*
 * Handshake messages
 */
/* Called from  ssl3_InitHandshakeHashes()
**      ssl3_AppendHandshake()
**      ssl3_HandleV2ClientHello()
**      ssl3_HandleHandshakeMessage()
** Caller must hold the ssl3Handshake lock.
*/
SECStatus
ssl3_UpdateHandshakeHashes(sslSocket *ss, const unsigned char *b, unsigned int l)
{
    return ssl3_UpdateHandshakeHashesInt(ss, b, l, NULL);
}

SECStatus
ssl3_UpdatePostHandshakeHashes(sslSocket *ss, const unsigned char *b, unsigned int l)
{
    SECStatus rv = SECSuccess;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    PRINT_BUF(90, (ss, "post handshake hash input:", b, l));

    PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_single);
    PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
    rv = PK11_DigestOp(ss->ssl3.hs.shaPostHandshake, b, l);
    if (rv != SECSuccess) {
        PORT_SetError(SSL_ERROR_DIGEST_FAILURE);
    }
    return rv;
}

SECStatus
ssl3_AppendHandshakeHeader(sslSocket *ss, SSLHandshakeType t, PRUint32 length)
{
    SECStatus rv;

    /* If we already have a message in place, we need to enqueue it.
     * This empties the buffer. This is a convenient place to call
     * dtls_StageHandshakeMessage to mark the message boundary.
     */
    if (IS_DTLS(ss)) {
        rv = dtls_StageHandshakeMessage(ss);
        if (rv != SECSuccess) {
            return rv;
        }
    }

    SSL_TRC(30, ("%d: SSL3[%d]: append handshake header: type %s",
                 SSL_GETPID(), ss->fd, ssl3_DecodeHandshakeType(t)));

    rv = ssl3_AppendHandshakeNumber(ss, t, 1);
    if (rv != SECSuccess) {
        return rv; /* error code set by AppendHandshake, if applicable. */
    }
    rv = ssl3_AppendHandshakeNumber(ss, length, 3);
    if (rv != SECSuccess) {
        return rv; /* error code set by AppendHandshake, if applicable. */
    }

    if (IS_DTLS(ss)) {
        /* Note that we make an unfragmented message here. We fragment in the
         * transmission code, if necessary */
        rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.sendMessageSeq, 2);
        if (rv != SECSuccess) {
            return rv; /* error code set by AppendHandshake, if applicable. */
        }
        ss->ssl3.hs.sendMessageSeq++;

        /* 0 is the fragment offset, because it's not fragmented yet */
        rv = ssl3_AppendHandshakeNumber(ss, 0, 3);
        if (rv != SECSuccess) {
            return rv; /* error code set by AppendHandshake, if applicable. */
        }

        /* Fragment length -- set to the packet length because not fragmented */
        rv = ssl3_AppendHandshakeNumber(ss, length, 3);
        if (rv != SECSuccess) {
            return rv; /* error code set by AppendHandshake, if applicable. */
        }
    }

    return rv; /* error code set by AppendHandshake, if applicable. */
}

/**************************************************************************
 * Consume Handshake functions.
 *
 * All data used in these functions is protected by two locks,
 * the RecvBufLock and the SSL3HandshakeLock
 **************************************************************************/

/* Read up the next "bytes" number of bytes from the (decrypted) input
 * stream "b" (which is *length bytes long). Copy them into buffer "v".
 * Reduces *length by bytes.  Advances *b by bytes.
 *
 * If this function returns SECFailure, it has already sent an alert,
 * and has set a generic error code.  The caller should probably
 * override the generic error code by setting another.
 */
SECStatus
ssl3_ConsumeHandshake(sslSocket *ss, void *v, PRUint32 bytes, PRUint8 **b,
                      PRUint32 *length)
{
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if ((PRUint32)bytes > *length) {
        return ssl3_DecodeError(ss);
    }
    PORT_Memcpy(v, *b, bytes);
    PRINT_BUF(60, (ss, "consume bytes:", *b, bytes));
    *b += bytes;
    *length -= bytes;
    return SECSuccess;
}

/* Read up the next "bytes" number of bytes from the (decrypted) input
 * stream "b" (which is *length bytes long), and interpret them as an
 * integer in network byte order.  Sets *num to the received value.
 * Reduces *length by bytes.  Advances *b by bytes.
 *
 * On error, an alert has been sent, and a generic error code has been set.
 */
SECStatus
ssl3_ConsumeHandshakeNumber64(sslSocket *ss, PRUint64 *num, PRUint32 bytes,
                              PRUint8 **b, PRUint32 *length)
{
    PRUint8 *buf = *b;
    PRUint32 i;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    *num = 0;
    if (bytes > sizeof(*num)) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    if (bytes > *length) {
        return ssl3_DecodeError(ss);
    }
    PRINT_BUF(60, (ss, "consume bytes:", *b, bytes));

    for (i = 0; i < bytes; i++) {
        *num = (*num << 8) + buf[i];
    }
    *b += bytes;
    *length -= bytes;
    return SECSuccess;
}

SECStatus
ssl3_ConsumeHandshakeNumber(sslSocket *ss, PRUint32 *num, PRUint32 bytes,
                            PRUint8 **b, PRUint32 *length)
{
    PRUint64 num64;
    SECStatus rv;

    PORT_Assert(bytes <= sizeof(*num));
    if (bytes > sizeof(*num)) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }
    rv = ssl3_ConsumeHandshakeNumber64(ss, &num64, bytes, b, length);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    *num = num64 & 0xffffffff;
    return SECSuccess;
}

/* Read in two values from the incoming decrypted byte stream "b", which is
 * *length bytes long.  The first value is a number whose size is "bytes"
 * bytes long.  The second value is a byte-string whose size is the value
 * of the first number received.  The latter byte-string, and its length,
 * is returned in the SECItem i.
 *
 * Returns SECFailure (-1) on failure.
 * On error, an alert has been sent, and a generic error code has been set.
 *
 * RADICAL CHANGE for NSS 3.11.  All callers of this function make copies
 * of the data returned in the SECItem *i, so making a copy of it here
 * is simply wasteful.  So, This function now just sets SECItem *i to
 * point to the values in the buffer **b.
 */
SECStatus
ssl3_ConsumeHandshakeVariable(sslSocket *ss, SECItem *i, PRUint32 bytes,
                              PRUint8 **b, PRUint32 *length)
{
    PRUint32 count;
    SECStatus rv;

    PORT_Assert(bytes <= 3);
    i->len = 0;
    i->data = NULL;
    i->type = siBuffer;
    rv = ssl3_ConsumeHandshakeNumber(ss, &count, bytes, b, length);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (count > 0) {
        if (count > *length) {
            return ssl3_DecodeError(ss);
        }
        i->data = *b;
        i->len = count;
        *b += count;
        *length -= count;
    }
    return SECSuccess;
}

/* ssl3_TLSHashAlgorithmToOID converts a TLS hash identifier into an OID value.
 * If the hash is not recognised, SEC_OID_UNKNOWN is returned.
 *
 * See https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 */
SECOidTag
ssl3_HashTypeToOID(SSLHashType hashType)
{
    switch (hashType) {
        case ssl_hash_sha1:
            return SEC_OID_SHA1;
        case ssl_hash_sha256:
            return SEC_OID_SHA256;
        case ssl_hash_sha384:
            return SEC_OID_SHA384;
        case ssl_hash_sha512:
            return SEC_OID_SHA512;
        default:
            break;
    }
    return SEC_OID_UNKNOWN;
}

SECOidTag
ssl3_AuthTypeToOID(SSLAuthType authType)
{
    switch (authType) {
        case ssl_auth_rsa_sign:
            return SEC_OID_PKCS1_RSA_ENCRYPTION;
        case ssl_auth_rsa_pss:
            return SEC_OID_PKCS1_RSA_PSS_SIGNATURE;
        case ssl_auth_ecdsa:
            return SEC_OID_ANSIX962_EC_PUBLIC_KEY;
        case ssl_auth_dsa:
            return SEC_OID_ANSIX9_DSA_SIGNATURE;
        default:
            break;
    }
    /* shouldn't ever get there */
    PORT_Assert(0);
    return SEC_OID_UNKNOWN;
}

SSLHashType
ssl_SignatureSchemeToHashType(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pkcs1_sha1:
        case ssl_sig_dsa_sha1:
        case ssl_sig_ecdsa_sha1:
            return ssl_hash_sha1;
        case ssl_sig_rsa_pkcs1_sha256:
        case ssl_sig_ecdsa_secp256r1_sha256:
        case ssl_sig_rsa_pss_rsae_sha256:
        case ssl_sig_rsa_pss_pss_sha256:
        case ssl_sig_dsa_sha256:
            return ssl_hash_sha256;
        case ssl_sig_rsa_pkcs1_sha384:
        case ssl_sig_ecdsa_secp384r1_sha384:
        case ssl_sig_rsa_pss_rsae_sha384:
        case ssl_sig_rsa_pss_pss_sha384:
        case ssl_sig_dsa_sha384:
            return ssl_hash_sha384;
        case ssl_sig_rsa_pkcs1_sha512:
        case ssl_sig_ecdsa_secp521r1_sha512:
        case ssl_sig_rsa_pss_rsae_sha512:
        case ssl_sig_rsa_pss_pss_sha512:
        case ssl_sig_dsa_sha512:
            return ssl_hash_sha512;
        case ssl_sig_rsa_pkcs1_sha1md5:
            return ssl_hash_none; /* Special for TLS 1.0/1.1. */
        case ssl_sig_none:
        case ssl_sig_ed25519:
        case ssl_sig_ed448:
            break;
    }
    PORT_Assert(0);
    return ssl_hash_none;
}

static PRBool
ssl_SignatureSchemeMatchesSpkiOid(SSLSignatureScheme scheme, SECOidTag spkiOid)
{
    SECOidTag authOid = ssl3_AuthTypeToOID(ssl_SignatureSchemeToAuthType(scheme));

    if (spkiOid == authOid) {
        return PR_TRUE;
    }
    if ((authOid == SEC_OID_PKCS1_RSA_ENCRYPTION) &&
        (spkiOid == SEC_OID_X500_RSA_ENCRYPTION)) {
        return PR_TRUE;
    }
    return PR_FALSE;
}

/* Validate that the signature scheme works for the given key type. */
PRBool
ssl_SignatureSchemeValid(SSLSignatureScheme scheme, SECOidTag spkiOid,
                         PRBool isTls13)
{
    if (!ssl_IsSupportedSignatureScheme(scheme)) {
        return PR_FALSE;
    }
    /* if we are purposefully passed SEC_OID_UNKNOWN, it means
     * we not checking the scheme against a potential key, so skip
     * the call */
    if ((spkiOid != SEC_OID_UNKNOWN) &&
        !ssl_SignatureSchemeMatchesSpkiOid(scheme, spkiOid)) {
        return PR_FALSE;
    }
    if (isTls13) {
        if (ssl_SignatureSchemeToHashType(scheme) == ssl_hash_sha1) {
            return PR_FALSE;
        }
        if (ssl_IsRsaPkcs1SignatureScheme(scheme)) {
            return PR_FALSE;
        }
        if (ssl_IsDsaSignatureScheme(scheme)) {
            return PR_FALSE;
        }
        /* With TLS 1.3, EC keys should have been selected based on calling
         * ssl_SignatureSchemeFromSpki(), reject them otherwise. */
        return spkiOid != SEC_OID_ANSIX962_EC_PUBLIC_KEY;
    }
    return PR_TRUE;
}

static SECStatus
ssl_SignatureSchemeFromPssSpki(const CERTSubjectPublicKeyInfo *spki,
                               SSLSignatureScheme *scheme)
{
    SECKEYRSAPSSParams pssParam = { 0 };
    PORTCheapArenaPool arena;
    SECStatus rv;

    /* The key doesn't have parameters, boo. */
    if (!spki->algorithm.parameters.len) {
        *scheme = ssl_sig_none;
        return SECSuccess;
    }

    PORT_InitCheapArena(&arena, DER_DEFAULT_CHUNKSIZE);
    rv = SEC_QuickDERDecodeItem(&arena.arena, &pssParam,
                                SEC_ASN1_GET(SECKEY_RSAPSSParamsTemplate),
                                &spki->algorithm.parameters);
    if (rv != SECSuccess) {
        goto loser;
    }
    /* Not having hashAlg means SHA-1 and we don't accept that. */
    if (!pssParam.hashAlg) {
        goto loser;
    }
    switch (SECOID_GetAlgorithmTag(pssParam.hashAlg)) {
        case SEC_OID_SHA256:
            *scheme = ssl_sig_rsa_pss_pss_sha256;
            break;
        case SEC_OID_SHA384:
            *scheme = ssl_sig_rsa_pss_pss_sha384;
            break;
        case SEC_OID_SHA512:
            *scheme = ssl_sig_rsa_pss_pss_sha512;
            break;
        default:
            goto loser;
    }

    PORT_DestroyCheapArena(&arena);
    return SECSuccess;

loser:
    PORT_DestroyCheapArena(&arena);
    PORT_SetError(SSL_ERROR_BAD_CERTIFICATE);
    return SECFailure;
}

static SECStatus
ssl_SignatureSchemeFromEcSpki(const CERTSubjectPublicKeyInfo *spki,
                              SSLSignatureScheme *scheme)
{
    const sslNamedGroupDef *group;
    SECKEYPublicKey *key;

    key = SECKEY_ExtractPublicKey(spki);
    if (!key) {
        PORT_SetError(SSL_ERROR_BAD_CERTIFICATE);
        return SECFailure;
    }
    group = ssl_ECPubKey2NamedGroup(key);
    SECKEY_DestroyPublicKey(key);
    if (!group) {
        PORT_SetError(SSL_ERROR_BAD_CERTIFICATE);
        return SECFailure;
    }
    switch (group->name) {
        case ssl_grp_ec_secp256r1:
            *scheme = ssl_sig_ecdsa_secp256r1_sha256;
            return SECSuccess;
        case ssl_grp_ec_secp384r1:
            *scheme = ssl_sig_ecdsa_secp384r1_sha384;
            return SECSuccess;
        case ssl_grp_ec_secp521r1:
            *scheme = ssl_sig_ecdsa_secp521r1_sha512;
            return SECSuccess;
        default:
            break;
    }
    PORT_SetError(SSL_ERROR_BAD_CERTIFICATE);
    return SECFailure;
}

/* Newer signature schemes are designed so that a single SPKI can be used with
 * that scheme.  This determines that scheme from the SPKI. If the SPKI doesn't
 * have a single scheme, |*scheme| is set to ssl_sig_none. */
SECStatus
ssl_SignatureSchemeFromSpki(const CERTSubjectPublicKeyInfo *spki,
                            PRBool isTls13, SSLSignatureScheme *scheme)
{
    SECOidTag spkiOid = SECOID_GetAlgorithmTag(&spki->algorithm);

    if (spkiOid == SEC_OID_PKCS1_RSA_PSS_SIGNATURE) {
        return ssl_SignatureSchemeFromPssSpki(spki, scheme);
    }

    /* Only do this lookup for TLS 1.3, where the scheme can be determined from
     * the SPKI alone because the ECDSA key size determines the hash. Earlier
     * TLS versions allow the same EC key to be used with different hashes. */
    if (isTls13 && spkiOid == SEC_OID_ANSIX962_EC_PUBLIC_KEY) {
        return ssl_SignatureSchemeFromEcSpki(spki, scheme);
    }

    *scheme = ssl_sig_none;
    return SECSuccess;
}

/* Check that a signature scheme is enabled by configuration. */
PRBool
ssl_SignatureSchemeEnabled(const sslSocket *ss, SSLSignatureScheme scheme)
{
    unsigned int i;
    for (i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        if (scheme == ss->ssl3.signatureSchemes[i]) {
            return PR_TRUE;
        }
    }
    return PR_FALSE;
}

static PRBool
ssl_SignatureKeyMatchesSpkiOid(const ssl3KEADef *keaDef, SECOidTag spkiOid)
{
    switch (spkiOid) {
        case SEC_OID_X500_RSA_ENCRYPTION:
        case SEC_OID_PKCS1_RSA_ENCRYPTION:
        case SEC_OID_PKCS1_RSA_PSS_SIGNATURE:
            return keaDef->signKeyType == rsaKey;
        case SEC_OID_ANSIX9_DSA_SIGNATURE:
            return keaDef->signKeyType == dsaKey;
        case SEC_OID_ANSIX962_EC_PUBLIC_KEY:
            return keaDef->signKeyType == ecKey;
        default:
            break;
    }
    return PR_FALSE;
}

/* ssl3_CheckSignatureSchemeConsistency checks that the signature algorithm
 * identifier in |scheme| is consistent with the public key in |spki|. It also
 * checks the hash algorithm against the configured signature algorithms.  If
 * all the tests pass, SECSuccess is returned. Otherwise, PORT_SetError is
 * called and SECFailure is returned. */
SECStatus
ssl_CheckSignatureSchemeConsistency(sslSocket *ss, SSLSignatureScheme scheme,
                                    CERTSubjectPublicKeyInfo *spki)
{
    SSLSignatureScheme spkiScheme;
    PRBool isTLS13 = ss->version == SSL_LIBRARY_VERSION_TLS_1_3;
    SECOidTag spkiOid;
    SECStatus rv;

    rv = ssl_SignatureSchemeFromSpki(spki, isTLS13, &spkiScheme);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (spkiScheme != ssl_sig_none) {
        /* The SPKI in the certificate can only be used for a single scheme. */
        if (spkiScheme != scheme ||
            !ssl_SignatureSchemeEnabled(ss, scheme)) {
            PORT_SetError(SSL_ERROR_INCORRECT_SIGNATURE_ALGORITHM);
            return SECFailure;
        }
        return SECSuccess;
    }

    spkiOid = SECOID_GetAlgorithmTag(&spki->algorithm);

    /* If we're a client, check that the signature algorithm matches the signing
     * key type of the cipher suite. */
    if (!isTLS13 && !ss->sec.isServer) {
        if (!ssl_SignatureKeyMatchesSpkiOid(ss->ssl3.hs.kea_def, spkiOid)) {
            PORT_SetError(SSL_ERROR_INCORRECT_SIGNATURE_ALGORITHM);
            return SECFailure;
        }
    }

    /* Verify that the signature scheme matches the signing key. */
    if ((spkiOid == SEC_OID_UNKNOWN) ||
        !ssl_SignatureSchemeValid(scheme, spkiOid, isTLS13)) {
        PORT_SetError(SSL_ERROR_INCORRECT_SIGNATURE_ALGORITHM);
        return SECFailure;
    }

    if (!ssl_SignatureSchemeEnabled(ss, scheme)) {
        PORT_SetError(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
        return SECFailure;
    }

    return SECSuccess;
}

PRBool
ssl_IsSupportedSignatureScheme(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pkcs1_sha1:
        case ssl_sig_rsa_pkcs1_sha256:
        case ssl_sig_rsa_pkcs1_sha384:
        case ssl_sig_rsa_pkcs1_sha512:
        case ssl_sig_rsa_pss_rsae_sha256:
        case ssl_sig_rsa_pss_rsae_sha384:
        case ssl_sig_rsa_pss_rsae_sha512:
        case ssl_sig_rsa_pss_pss_sha256:
        case ssl_sig_rsa_pss_pss_sha384:
        case ssl_sig_rsa_pss_pss_sha512:
        case ssl_sig_ecdsa_secp256r1_sha256:
        case ssl_sig_ecdsa_secp384r1_sha384:
        case ssl_sig_ecdsa_secp521r1_sha512:
        case ssl_sig_dsa_sha1:
        case ssl_sig_dsa_sha256:
        case ssl_sig_dsa_sha384:
        case ssl_sig_dsa_sha512:
        case ssl_sig_ecdsa_sha1:
            return ssl_SchemePolicyOK(scheme, kSSLSigSchemePolicy);
            break;

        case ssl_sig_rsa_pkcs1_sha1md5:
        case ssl_sig_none:
        case ssl_sig_ed25519:
        case ssl_sig_ed448:
            return PR_FALSE;
    }
    return PR_FALSE;
}

PRBool
ssl_IsRsaPssSignatureScheme(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pss_rsae_sha256:
        case ssl_sig_rsa_pss_rsae_sha384:
        case ssl_sig_rsa_pss_rsae_sha512:
        case ssl_sig_rsa_pss_pss_sha256:
        case ssl_sig_rsa_pss_pss_sha384:
        case ssl_sig_rsa_pss_pss_sha512:
            return PR_TRUE;

        default:
            return PR_FALSE;
    }
    return PR_FALSE;
}

PRBool
ssl_IsRsaeSignatureScheme(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pss_rsae_sha256:
        case ssl_sig_rsa_pss_rsae_sha384:
        case ssl_sig_rsa_pss_rsae_sha512:
            return PR_TRUE;

        default:
            return PR_FALSE;
    }
    return PR_FALSE;
}

PRBool
ssl_IsRsaPkcs1SignatureScheme(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pkcs1_sha256:
        case ssl_sig_rsa_pkcs1_sha384:
        case ssl_sig_rsa_pkcs1_sha512:
        case ssl_sig_rsa_pkcs1_sha1:
            return PR_TRUE;

        default:
            return PR_FALSE;
    }
    return PR_FALSE;
}

PRBool
ssl_IsDsaSignatureScheme(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_dsa_sha256:
        case ssl_sig_dsa_sha384:
        case ssl_sig_dsa_sha512:
        case ssl_sig_dsa_sha1:
            return PR_TRUE;

        default:
            return PR_FALSE;
    }
    return PR_FALSE;
}

SSLAuthType
ssl_SignatureSchemeToAuthType(SSLSignatureScheme scheme)
{
    switch (scheme) {
        case ssl_sig_rsa_pkcs1_sha1:
        case ssl_sig_rsa_pkcs1_sha1md5:
        case ssl_sig_rsa_pkcs1_sha256:
        case ssl_sig_rsa_pkcs1_sha384:
        case ssl_sig_rsa_pkcs1_sha512:
        /* We report based on the key type for PSS signatures. */
        case ssl_sig_rsa_pss_rsae_sha256:
        case ssl_sig_rsa_pss_rsae_sha384:
        case ssl_sig_rsa_pss_rsae_sha512:
            return ssl_auth_rsa_sign;
        case ssl_sig_rsa_pss_pss_sha256:
        case ssl_sig_rsa_pss_pss_sha384:
        case ssl_sig_rsa_pss_pss_sha512:
            return ssl_auth_rsa_pss;
        case ssl_sig_ecdsa_secp256r1_sha256:
        case ssl_sig_ecdsa_secp384r1_sha384:
        case ssl_sig_ecdsa_secp521r1_sha512:
        case ssl_sig_ecdsa_sha1:
            return ssl_auth_ecdsa;
        case ssl_sig_dsa_sha1:
        case ssl_sig_dsa_sha256:
        case ssl_sig_dsa_sha384:
        case ssl_sig_dsa_sha512:
            return ssl_auth_dsa;

        default:
            PORT_Assert(0);
    }
    return ssl_auth_null;
}

/* ssl_ConsumeSignatureScheme reads a SSLSignatureScheme (formerly
 * SignatureAndHashAlgorithm) structure from |b| and puts the resulting value
 * into |out|. |b| and |length| are updated accordingly.
 *
 * See https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 */
SECStatus
ssl_ConsumeSignatureScheme(sslSocket *ss, PRUint8 **b,
                           PRUint32 *length, SSLSignatureScheme *out)
{
    PRUint32 tmp;
    SECStatus rv;

    rv = ssl3_ConsumeHandshakeNumber(ss, &tmp, 2, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* Alert sent, Error code set already. */
    }
    if (!ssl_IsSupportedSignatureScheme((SSLSignatureScheme)tmp)) {
        SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
        PORT_SetError(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
        return SECFailure;
    }
    *out = (SSLSignatureScheme)tmp;
    return SECSuccess;
}

/**************************************************************************
 * end of Consume Handshake functions.
 **************************************************************************/

static SECStatus
ssl3_ComputeHandshakeHash(unsigned char *buf, unsigned int len,
                          SSLHashType hashAlg, SSL3Hashes *hashes)
{
    SECStatus rv = SECFailure;
    PK11Context *hashContext = PK11_CreateDigestContext(
        ssl3_HashTypeToOID(hashAlg));

    if (!hashContext) {
        return rv;
    }
    rv = PK11_DigestBegin(hashContext);
    if (rv == SECSuccess) {
        rv = PK11_DigestOp(hashContext, buf, len);
    }
    if (rv == SECSuccess) {
        rv = PK11_DigestFinal(hashContext, hashes->u.raw, &hashes->len,
                              sizeof(hashes->u.raw));
    }
    if (rv == SECSuccess) {
        hashes->hashAlg = hashAlg;
    }
    PK11_DestroyContext(hashContext, PR_TRUE);
    return rv;
}

/* Extract the hashes of handshake messages to this point.
 * Called from ssl3_SendCertificateVerify
 *             ssl3_SendFinished
 *             ssl3_HandleHandshakeMessage
 *
 * Caller must hold the SSL3HandshakeLock.
 * Caller must hold a read or write lock on the Spec R/W lock.
 *  (There is presently no way to assert on a Read lock.)
 */
SECStatus
ssl3_ComputeHandshakeHashes(sslSocket *ss,
                            ssl3CipherSpec *spec, /* uses ->master_secret */
                            SSL3Hashes *hashes,   /* output goes here. */
                            PRUint32 sender)
{
    SECStatus rv = SECSuccess;
    PRBool isTLS = (PRBool)(spec->version > SSL_LIBRARY_VERSION_3_0);
    unsigned int outLength;
    PRUint8 md5_inner[MAX_MAC_LENGTH];
    PRUint8 sha_inner[MAX_MAC_LENGTH];

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    if (ss->ssl3.hs.hashType == handshake_hash_unknown) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    hashes->hashAlg = ssl_hash_none;

    if (ss->ssl3.hs.hashType == handshake_hash_single) {
        PK11Context *h;
        unsigned int stateLen;
        unsigned char stackBuf[1024];
        unsigned char *stateBuf = NULL;

        h = ss->ssl3.hs.sha;
        stateBuf = PK11_SaveContextAlloc(h, stackBuf,
                                         sizeof(stackBuf), &stateLen);
        if (stateBuf == NULL) {
            ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
            rv = SECFailure;
            goto tls12_loser;
        }
        rv |= PK11_DigestFinal(h, hashes->u.raw, &hashes->len,
                               sizeof(hashes->u.raw));
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
            rv = SECFailure;
            goto tls12_loser;
        }

        hashes->hashAlg = ssl3_GetSuitePrfHash(ss);

    tls12_loser:
        if (stateBuf) {
            if (PK11_RestoreContext(h, stateBuf, stateLen) != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
                rv = SECFailure;
            }
            if (stateBuf != stackBuf) {
                PORT_ZFree(stateBuf, stateLen);
            }
        }
    } else if (ss->ssl3.hs.hashType == handshake_hash_record) {
        rv = ssl3_ComputeHandshakeHash(ss->ssl3.hs.messages.buf,
                                       ss->ssl3.hs.messages.len,
                                       ssl3_GetSuitePrfHash(ss),
                                       hashes);
    } else {
        PK11Context *md5;
        PK11Context *sha = NULL;
        unsigned char *md5StateBuf = NULL;
        unsigned char *shaStateBuf = NULL;
        unsigned int md5StateLen, shaStateLen;
        unsigned char md5StackBuf[256];
        unsigned char shaStackBuf[512];
        const int md5Pad = ssl_GetMacDefByAlg(ssl_mac_md5)->pad_size;
        const int shaPad = ssl_GetMacDefByAlg(ssl_mac_sha)->pad_size;

        md5StateBuf = PK11_SaveContextAlloc(ss->ssl3.hs.md5, md5StackBuf,
                                            sizeof md5StackBuf, &md5StateLen);
        if (md5StateBuf == NULL) {
            ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
            rv = SECFailure;
            goto loser;
        }
        md5 = ss->ssl3.hs.md5;

        shaStateBuf = PK11_SaveContextAlloc(ss->ssl3.hs.sha, shaStackBuf,
                                            sizeof shaStackBuf, &shaStateLen);
        if (shaStateBuf == NULL) {
            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
            rv = SECFailure;
            goto loser;
        }
        sha = ss->ssl3.hs.sha;

        if (!isTLS) {
            /* compute hashes for SSL3. */
            unsigned char s[4];

            if (!spec->masterSecret) {
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HANDSHAKE);
                rv = SECFailure;
                goto loser;
            }

            s[0] = (unsigned char)(sender >> 24);
            s[1] = (unsigned char)(sender >> 16);
            s[2] = (unsigned char)(sender >> 8);
            s[3] = (unsigned char)sender;

            if (sender != 0) {
                rv |= PK11_DigestOp(md5, s, 4);
                PRINT_BUF(95, (NULL, "MD5 inner: sender", s, 4));
            }

            PRINT_BUF(95, (NULL, "MD5 inner: MAC Pad 1", mac_pad_1, md5Pad));

            rv |= PK11_DigestKey(md5, spec->masterSecret);
            rv |= PK11_DigestOp(md5, mac_pad_1, md5Pad);
            rv |= PK11_DigestFinal(md5, md5_inner, &outLength, MD5_LENGTH);
            PORT_Assert(rv != SECSuccess || outLength == MD5_LENGTH);
            if (rv != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
                rv = SECFailure;
                goto loser;
            }

            PRINT_BUF(95, (NULL, "MD5 inner: result", md5_inner, outLength));

            if (sender != 0) {
                rv |= PK11_DigestOp(sha, s, 4);
                PRINT_BUF(95, (NULL, "SHA inner: sender", s, 4));
            }

            PRINT_BUF(95, (NULL, "SHA inner: MAC Pad 1", mac_pad_1, shaPad));

            rv |= PK11_DigestKey(sha, spec->masterSecret);
            rv |= PK11_DigestOp(sha, mac_pad_1, shaPad);
            rv |= PK11_DigestFinal(sha, sha_inner, &outLength, SHA1_LENGTH);
            PORT_Assert(rv != SECSuccess || outLength == SHA1_LENGTH);
            if (rv != SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                rv = SECFailure;
                goto loser;
            }

            PRINT_BUF(95, (NULL, "SHA inner: result", sha_inner, outLength));

            PRINT_BUF(95, (NULL, "MD5 outer: MAC Pad 2", mac_pad_2, md5Pad));
            PRINT_BUF(95, (NULL, "MD5 outer: MD5 inner", md5_inner, MD5_LENGTH));

            rv |= PK11_DigestBegin(md5);
            rv |= PK11_DigestKey(md5, spec->masterSecret);
            rv |= PK11_DigestOp(md5, mac_pad_2, md5Pad);
            rv |= PK11_DigestOp(md5, md5_inner, MD5_LENGTH);
        }
        rv |= PK11_DigestFinal(md5, hashes->u.s.md5, &outLength, MD5_LENGTH);
        PORT_Assert(rv != SECSuccess || outLength == MD5_LENGTH);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
            rv = SECFailure;
            goto loser;
        }

        PRINT_BUF(60, (NULL, "MD5 outer: result", hashes->u.s.md5, MD5_LENGTH));

        if (!isTLS) {
            PRINT_BUF(95, (NULL, "SHA outer: MAC Pad 2", mac_pad_2, shaPad));
            PRINT_BUF(95, (NULL, "SHA outer: SHA inner", sha_inner, SHA1_LENGTH));

            rv |= PK11_DigestBegin(sha);
            rv |= PK11_DigestKey(sha, spec->masterSecret);
            rv |= PK11_DigestOp(sha, mac_pad_2, shaPad);
            rv |= PK11_DigestOp(sha, sha_inner, SHA1_LENGTH);
        }
        rv |= PK11_DigestFinal(sha, hashes->u.s.sha, &outLength, SHA1_LENGTH);
        PORT_Assert(rv != SECSuccess || outLength == SHA1_LENGTH);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
            rv = SECFailure;
            goto loser;
        }

        PRINT_BUF(60, (NULL, "SHA outer: result", hashes->u.s.sha, SHA1_LENGTH));

        hashes->len = MD5_LENGTH + SHA1_LENGTH;

    loser:
        if (md5StateBuf) {
            if (PK11_RestoreContext(ss->ssl3.hs.md5, md5StateBuf, md5StateLen) !=
                SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_MD5_DIGEST_FAILURE);
                rv = SECFailure;
            }
            if (md5StateBuf != md5StackBuf) {
                PORT_ZFree(md5StateBuf, md5StateLen);
            }
        }
        if (shaStateBuf) {
            if (PK11_RestoreContext(ss->ssl3.hs.sha, shaStateBuf, shaStateLen) !=
                SECSuccess) {
                ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE);
                rv = SECFailure;
            }
            if (shaStateBuf != shaStackBuf) {
                PORT_ZFree(shaStateBuf, shaStateLen);
            }
        }
    }
    return rv;
}

/**************************************************************************
 * end of Handshake Hash functions.
 * Begin Send and Handle functions for handshakes.
 **************************************************************************/

#ifdef TRACE
#define CHTYPE(t)          \
    case client_hello_##t: \
        return #t;

static const char *
ssl_ClientHelloTypeName(sslClientHelloType type)
{
    switch (type) {
        CHTYPE(initial);
        CHTYPE(retry);
        CHTYPE(retransmit);    /* DTLS only */
        CHTYPE(renegotiation); /* TLS <= 1.2 only */
    }
    PORT_Assert(0);
    return NULL;
}
#undef CHTYPE
#endif

PR_STATIC_ASSERT(SSL3_SESSIONID_BYTES == SSL3_RANDOM_LENGTH);
static void
ssl_MakeFakeSid(sslSocket *ss, PRUint8 *buf)
{
    PRUint8 x = 0x5a;
    int i;
    for (i = 0; i < SSL3_SESSIONID_BYTES; ++i) {
        x += ss->ssl3.hs.client_random[i];
        buf[i] = x;
    }
}

/* Set the version fields of the cipher spec for a ClientHello. */
static void
ssl_SetClientHelloSpecVersion(sslSocket *ss, ssl3CipherSpec *spec)
{
    ssl_GetSpecWriteLock(ss);
    PORT_Assert(spec->cipherDef->cipher == cipher_null);
    /* This is - a best guess - but it doesn't matter here. */
    spec->version = ss->vrange.max;
    if (IS_DTLS(ss)) {
        spec->recordVersion = SSL_LIBRARY_VERSION_DTLS_1_0_WIRE;
    } else {
        /* For new connections, cap the record layer version number of TLS
         * ClientHello to { 3, 1 } (TLS 1.0). Some TLS 1.0 servers (which seem
         * to use F5 BIG-IP) ignore ClientHello.client_version and use the
         * record layer version number (TLSPlaintext.version) instead when
         * negotiating protocol versions. In addition, if the record layer
         * version number of ClientHello is { 3, 2 } (TLS 1.1) or higher, these
         * servers reset the TCP connections. Lastly, some F5 BIG-IP servers
         * hang if a record containing a ClientHello has a version greater than
         * { 3, 1 } and a length greater than 255. Set this flag to work around
         * such servers.
         *
         * The final version is set when a version is negotiated.
         */
        spec->recordVersion = PR_MIN(SSL_LIBRARY_VERSION_TLS_1_0,
                                     ss->vrange.max);
    }
    ssl_ReleaseSpecWriteLock(ss);
}

SECStatus
ssl3_InsertChHeaderSize(const sslSocket *ss, sslBuffer *preamble, const sslBuffer *extensions)
{
    SECStatus rv;
    unsigned int msgLen = preamble->len;
    msgLen += extensions->len ? (2 + extensions->len) : 0;
    unsigned int headerLen = IS_DTLS(ss) ? 12 : 4;

    /* Record the message length. */
    rv = sslBuffer_InsertNumber(preamble, 1, msgLen - headerLen, 3);
    if (rv != SECSuccess) {
        return SECFailure; /* code set */
    }
    if (IS_DTLS(ss)) {
        /* Record the (unfragmented) fragment length. */
        unsigned int offset = 1 /* ch */ + 3 /* len */ +
                              2 /* seq */ + 3 /* fragment offset */;
        rv = sslBuffer_InsertNumber(preamble, offset, msgLen - headerLen, 3);
        if (rv != SECSuccess) {
            return SECFailure; /* code set */
        }
    }

    return SECSuccess;
}

static SECStatus
ssl3_AppendCipherSuites(sslSocket *ss, PRBool fallbackSCSV, sslBuffer *buf)
{
    SECStatus rv;
    unsigned int offset;
    unsigned int i;
    unsigned int saveLen;

    rv = sslBuffer_Skip(buf, 2, &offset);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (ss->ssl3.hs.sendingSCSV) {
        /* Add the actual SCSV */
        rv = sslBuffer_AppendNumber(buf, TLS_EMPTY_RENEGOTIATION_INFO_SCSV,
                                    sizeof(ssl3CipherSuite));
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }
    if (fallbackSCSV) {
        rv = sslBuffer_AppendNumber(buf, TLS_FALLBACK_SCSV,
                                    sizeof(ssl3CipherSuite));
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

    saveLen = SSL_BUFFER_LEN(buf);
    /* CipherSuites are appended to Hello message here */
    for (i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        ssl3CipherSuiteCfg *suite = &ss->cipherSuites[i];
        if (ssl3_config_match(suite, ss->ssl3.policy, &ss->vrange, ss)) {
            rv = sslBuffer_AppendNumber(buf, suite->cipher_suite,
                                        sizeof(ssl3CipherSuite));
            if (rv != SECSuccess) {
                return SECFailure;
            }
        }
    }

    /* GREASE CipherSuites:
     * A client MAY select one or more GREASE cipher suite values and advertise
     * them in the "cipher_suites" field [RFC8701, Section 3.1]. */
    if (ss->opt.enableGrease && ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3) {
        rv = sslBuffer_AppendNumber(buf, ss->ssl3.hs.grease->idx[grease_cipher],
                                    sizeof(ssl3CipherSuite));
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

    if (SSL_ALL_VERSIONS_DISABLED(&ss->vrange) ||
        (SSL_BUFFER_LEN(buf) - saveLen) == 0) {
        PORT_SetError(SSL_ERROR_SSL_DISABLED);
        return SECFailure;
    }

    return sslBuffer_InsertLength(buf, offset, 2);
}

SECStatus
ssl3_CreateClientHelloPreamble(sslSocket *ss, const sslSessionID *sid,
                               PRBool realSid, PRUint16 version, PRBool isEchInner,
                               const sslBuffer *extensions, sslBuffer *preamble)
{
    SECStatus rv;
    sslBuffer constructed = SSL_BUFFER_EMPTY;
    const PRUint8 *client_random = isEchInner ? ss->ssl3.hs.client_inner_random : ss->ssl3.hs.client_random;
    PORT_Assert(sid);
    PRBool fallbackSCSV = ss->opt.enableFallbackSCSV && !isEchInner &&
                          (!realSid || version < sid->version);

    rv = sslBuffer_AppendNumber(&constructed, ssl_hs_client_hello, 1);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = sslBuffer_Skip(&constructed, 3, NULL);
    if (rv != SECSuccess) {
        goto loser;
    }

    if (IS_DTLS(ss)) {
        /* Note that we make an unfragmented message here. We fragment in the
         * transmission code, if necessary */
        rv = sslBuffer_AppendNumber(&constructed, ss->ssl3.hs.sendMessageSeq, 2);
        if (rv != SECSuccess) {
            goto loser;
        }
        ss->ssl3.hs.sendMessageSeq++;

        /* 0 is the fragment offset, because it's not fragmented yet */
        rv = sslBuffer_AppendNumber(&constructed, 0, 3);
        if (rv != SECSuccess) {
            goto loser;
        }

        /* Fragment length -- set to the packet length because not fragmented */
        rv = sslBuffer_Skip(&constructed, 3, NULL);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    if (ss->firstHsDone) {
        /* The client hello version must stay unchanged to work around
         * the Windows SChannel bug described in ssl3_SendClientHello. */
        PORT_Assert(version == ss->clientHelloVersion);
    }

    ss->clientHelloVersion = PR_MIN(version, SSL_LIBRARY_VERSION_TLS_1_2);
    if (IS_DTLS(ss)) {
        PRUint16 dtlsVersion = dtls_TLSVersionToDTLSVersion(ss->clientHelloVersion);
        rv = sslBuffer_AppendNumber(&constructed, dtlsVersion, 2);
    } else {
        rv = sslBuffer_AppendNumber(&constructed, ss->clientHelloVersion, 2);
    }
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = sslBuffer_Append(&constructed, client_random, SSL3_RANDOM_LENGTH);
    if (rv != SECSuccess) {
        goto loser;
    }

    if (sid->version < SSL_LIBRARY_VERSION_TLS_1_3 && !isEchInner) {
        rv = sslBuffer_AppendVariable(&constructed, sid->u.ssl3.sessionID,
                                      sid->u.ssl3.sessionIDLength, 1);
    } else if (ss->opt.enableTls13CompatMode && !IS_DTLS(ss)) {
        /* We're faking session resumption, so rather than create new
         * randomness, just mix up the client random a little. */
        PRUint8 buf[SSL3_SESSIONID_BYTES];
        ssl_MakeFakeSid(ss, buf);
        rv = sslBuffer_AppendVariable(&constructed, buf, SSL3_SESSIONID_BYTES, 1);
    } else {
        rv = sslBuffer_AppendNumber(&constructed, 0, 1);
    }
    if (rv != SECSuccess) {
        goto loser;
    }

    if (IS_DTLS(ss)) {
        /* This cookieLen applies to the cookie that appears in the DTLS
        * ClientHello, which isn't used in DTLS 1.3. */
        rv = sslBuffer_AppendVariable(&constructed, ss->ssl3.hs.cookie.data,
                                      ss->ssl3.hs.helloRetry ? 0 : ss->ssl3.hs.cookie.len,
                                      1);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    rv = ssl3_AppendCipherSuites(ss, fallbackSCSV, &constructed);
    if (rv != SECSuccess) {
        goto loser;
    }

    /* Compression methods: count is always 1, null compression. */
    rv = sslBuffer_AppendNumber(&constructed, 1, 1);
    if (rv != SECSuccess) {
        goto loser;
    }
    rv = sslBuffer_AppendNumber(&constructed, ssl_compression_null, 1);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = ssl3_InsertChHeaderSize(ss, &constructed, extensions);
    if (rv != SECSuccess) {
        goto loser;
    }

    *preamble = constructed;
    return SECSuccess;
loser:
    sslBuffer_Clear(&constructed);
    return SECFailure;
}

/* Called from ssl3_HandleHelloRequest(),
 *             ssl3_RedoHandshake()
 *             ssl_BeginClientHandshake (when resuming ssl3 session)
 *             dtls_HandleHelloVerifyRequest(with resending=PR_TRUE)
 *
 * The |type| argument indicates what is going on here:
 * - client_hello_initial is set for the very first ClientHello
 * - client_hello_retry indicates that this is a second attempt after receiving
 *   a HelloRetryRequest (in TLS 1.3)
 * - client_hello_retransmit is used in DTLS when resending
 * - client_hello_renegotiation is used to renegotiate (in TLS <1.3)
 */
SECStatus
ssl3_SendClientHello(sslSocket *ss, sslClientHelloType type)
{
    sslSessionID *sid;
    SECStatus rv;
    PRBool isTLS = PR_FALSE;
    PRBool requestingResume = PR_FALSE;
    PRBool unlockNeeded = PR_FALSE;
    sslBuffer extensionBuf = SSL_BUFFER_EMPTY;
    PRUint16 version = ss->vrange.max;
    PRInt32 flags;
    sslBuffer chBuf = SSL_BUFFER_EMPTY;

    SSL_TRC(3, ("%d: SSL3[%d]: send %s ClientHello handshake", SSL_GETPID(),
                ss->fd, ssl_ClientHelloTypeName(type)));

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    /* shouldn't get here if SSL3 is disabled, but ... */
    if (SSL_ALL_VERSIONS_DISABLED(&ss->vrange)) {
        PR_NOT_REACHED("No versions of SSL 3.0 or later are enabled");
        PORT_SetError(SSL_ERROR_SSL_DISABLED);
        return SECFailure;
    }

    /* If we are responding to a HelloRetryRequest, don't reinitialize. We need
     * to maintain the handshake hashes. */
    if (!ss->ssl3.hs.helloRetry) {
        ssl3_RestartHandshakeHashes(ss);
    }
    PORT_Assert(!ss->ssl3.hs.helloRetry || type == client_hello_retry);

    if (type == client_hello_initial) {
        ssl_SetClientHelloSpecVersion(ss, ss->ssl3.cwSpec);
    }
    /* These must be reset every handshake. */
    ssl3_ResetExtensionData(&ss->xtnData, ss);
    ss->ssl3.hs.sendingSCSV = PR_FALSE;
    ss->ssl3.hs.preliminaryInfo = 0;
    PORT_Assert(IS_DTLS(ss) || type != client_hello_retransmit);
    SECITEM_FreeItem(&ss->ssl3.hs.newSessionTicket.ticket, PR_FALSE);
    ss->ssl3.hs.receivedNewSessionTicket = PR_FALSE;

    /* How many suites does our PKCS11 support (regardless of policy)? */
    if (ssl3_config_match_init(ss) == 0) {
        return SECFailure; /* ssl3_config_match_init has set error code. */
    }

    /*
     * During a renegotiation, ss->clientHelloVersion will be used again to
     * work around a Windows SChannel bug. Ensure that it is still enabled.
     */
    if (ss->firstHsDone) {
        PORT_Assert(type != client_hello_initial);
        if (SSL_ALL_VERSIONS_DISABLED(&ss->vrange)) {
            PORT_SetError(SSL_ERROR_SSL_DISABLED);
            return SECFailure;
        }

        if (ss->clientHelloVersion < ss->vrange.min ||
            ss->clientHelloVersion > ss->vrange.max) {
            PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
            return SECFailure;
        }
    }

    /* Check if we have a ss->sec.ci.sid.
     * Check that it's not expired.
     * If we have an sid and it comes from an external cache, we use it. */
    if (ss->sec.ci.sid && ss->sec.ci.sid->cached == in_external_cache) {
        PORT_Assert(!ss->sec.isServer);
        sid = ssl_ReferenceSID(ss->sec.ci.sid);
        SSL_TRC(3, ("%d: SSL3[%d]: using external resumption token in ClientHello",
                    SSL_GETPID(), ss->fd));
    } else if (ss->sec.ci.sid && ss->statelessResume && type == client_hello_retry) {
        /* If we are sending a second ClientHello, reuse the same SID
         * as the original one. */
        sid = ssl_ReferenceSID(ss->sec.ci.sid);
    } else if (!ss->opt.noCache) {
        /* We ignore ss->sec.ci.sid here, and use ssl_Lookup because Lookup
         * handles expired entries and other details.
         * XXX If we've been called from ssl_BeginClientHandshake, then
         * this lookup is duplicative and wasteful.
         */
        sid = ssl_LookupSID(ssl_Time(ss), &ss->sec.ci.peer,
                            ss->sec.ci.port, ss->peerID, ss->url);
    } else {
        sid = NULL;
    }

    /* We can't resume based on a different token. If the sid exists,
     * make sure the token that holds the master secret still exists ...
     * If we previously did client-auth, make sure that the token that holds
     * the private key still exists, is logged in, hasn't been removed, etc.
     */
    if (sid) {
        PRBool sidOK = PR_TRUE;

        if (sid->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
            if (!tls13_ResumptionCompatible(ss, sid->u.ssl3.cipherSuite)) {
                sidOK = PR_FALSE;
            }
        } else {
            /* Check that the cipher suite we need is enabled. */
            const ssl3CipherSuiteCfg *suite =
                ssl_LookupCipherSuiteCfg(sid->u.ssl3.cipherSuite,
                                         ss->cipherSuites);
            SSLVersionRange vrange = { sid->version, sid->version };
            if (!suite || !ssl3_config_match(suite, ss->ssl3.policy, &vrange, ss)) {
                sidOK = PR_FALSE;
            }

            /* Check that no (valid) ECHConfigs are setup in combination with a
             * (resumable) TLS < 1.3 session id. */
            if (!PR_CLIST_IS_EMPTY(&ss->echConfigs)) {
                /* If there are ECH configs, the client must not resume but
                 * offer ECH. */
                sidOK = PR_FALSE;
            }
        }

        /* Check that we can recover the master secret. */
        if (sidOK) {
            PK11SlotInfo *slot = NULL;
            if (sid->u.ssl3.masterValid) {
                slot = SECMOD_LookupSlot(sid->u.ssl3.masterModuleID,
                                         sid->u.ssl3.masterSlotID);
            }
            if (slot == NULL) {
                sidOK = PR_FALSE;
            } else {
                PK11SymKey *wrapKey = NULL;
                if (!PK11_IsPresent(slot) ||
                    ((wrapKey = PK11_GetWrapKey(slot,
                                                sid->u.ssl3.masterWrapIndex,
                                                sid->u.ssl3.masterWrapMech,
                                                sid->u.ssl3.masterWrapSeries,
                                                ss->pkcs11PinArg)) == NULL)) {
                    sidOK = PR_FALSE;
                }
                if (wrapKey)
                    PK11_FreeSymKey(wrapKey);
                PK11_FreeSlot(slot);
                slot = NULL;
            }
        }
        /* If we previously did client-auth, make sure that the token that
        ** holds the private key still exists, is logged in, hasn't been
        ** removed, etc.
        */
        if (sidOK && !ssl3_ClientAuthTokenPresent(sid)) {
            sidOK = PR_FALSE;
        }

        if (sidOK) {
            /* Set version based on the sid. */
            if (ss->firstHsDone) {
                /*
                 * Windows SChannel compares the client_version inside the RSA
                 * EncryptedPreMasterSecret of a renegotiation with the
                 * client_version of the initial ClientHello rather than the
                 * ClientHello in the renegotiation. To work around this bug, we
                 * continue to use the client_version used in the initial
                 * ClientHello when renegotiating.
                 *
                 * The client_version of the initial ClientHello is still
                 * available in ss->clientHelloVersion. Ensure that
                 * sid->version is bounded within
                 * [ss->vrange.min, ss->clientHelloVersion], otherwise we
                 * can't use sid.
                 */
                if (sid->version >= ss->vrange.min &&
                    sid->version <= ss->clientHelloVersion) {
                    version = ss->clientHelloVersion;
                } else {
                    sidOK = PR_FALSE;
                }
            } else {
                /*
                 * Check sid->version is OK first.
                 * Previously, we would cap the version based on sid->version,
                 * but that prevents negotiation of a higher version if the
                 * previous session was reduced (e.g., with version fallback)
                 */
                if (sid->version < ss->vrange.min ||
                    sid->version > ss->vrange.max) {
                    sidOK = PR_FALSE;
                }
            }
        }

        if (!sidOK) {
            SSL_AtomicIncrementLong(&ssl3stats.sch_sid_cache_not_ok);
            ssl_UncacheSessionID(ss);
            ssl_FreeSID(sid);
            sid = NULL;
        }
    }

    if (sid) {
        requestingResume = PR_TRUE;
        SSL_AtomicIncrementLong(&ssl3stats.sch_sid_cache_hits);

        PRINT_BUF(4, (ss, "client, found session-id:", sid->u.ssl3.sessionID,
                      sid->u.ssl3.sessionIDLength));

        ss->ssl3.policy = sid->u.ssl3.policy;
    } else {
        SSL_AtomicIncrementLong(&ssl3stats.sch_sid_cache_misses);

        /*
         * Windows SChannel compares the client_version inside the RSA
         * EncryptedPreMasterSecret of a renegotiation with the
         * client_version of the initial ClientHello rather than the
         * ClientHello in the renegotiation. To work around this bug, we
         * continue to use the client_version used in the initial
         * ClientHello when renegotiating.
         */
        if (ss->firstHsDone) {
            version = ss->clientHelloVersion;
        }

        sid = ssl3_NewSessionID(ss, PR_FALSE);
        if (!sid) {
            return SECFailure; /* memory error is set */
        }
        /* ss->version isn't set yet, but the sid needs a sane value. */
        sid->version = version;
    }

    isTLS = (version > SSL_LIBRARY_VERSION_3_0);
    ssl_GetSpecWriteLock(ss);
    if (ss->ssl3.cwSpec->macDef->mac == ssl_mac_null) {
        /* SSL records are not being MACed. */
        ss->ssl3.cwSpec->version = version;
    }
    ssl_ReleaseSpecWriteLock(ss);

    ssl_FreeSID(ss->sec.ci.sid); /* release the old sid */
    ss->sec.ci.sid = sid;

    /* HACK for SCSV in SSL 3.0.  On initial handshake, prepend SCSV,
     * only if TLS is disabled.
     */
    if (!ss->firstHsDone && !isTLS) {
        /* Must set this before calling Hello Extension Senders,
         * to suppress sending of empty RI extension.
         */
        ss->ssl3.hs.sendingSCSV = PR_TRUE;
    }

    /* When we attempt session resumption (only), we must lock the sid to
     * prevent races with other resumption connections that receive a
     * NewSessionTicket that will cause the ticket in the sid to be replaced.
     * Once we've copied the session ticket into our ClientHello message, it
     * is OK for the ticket to change, so we just need to make sure we hold
     * the lock across the calls to ssl_ConstructExtensions.
     */
    if (sid->u.ssl3.lock) {
        unlockNeeded = PR_TRUE;
        PR_RWLock_Rlock(sid->u.ssl3.lock);
    }

    /* Generate a new random if this is the first attempt or renegotiation. */
    if (type == client_hello_initial ||
        type == client_hello_renegotiation) {
        rv = ssl3_GetNewRandom(ss->ssl3.hs.client_random);
        if (rv != SECSuccess) {
            goto loser; /* err set by GetNewRandom. */
        }
    }

    if (ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3) {
        rv = tls13_SetupClientHello(ss, type);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    /* Setup TLS ClientHello Extension Permutation? */
    if (type == client_hello_initial &&
        ss->vrange.max > SSL_LIBRARY_VERSION_3_0 &&
        ss->opt.enableChXtnPermutation) {
        rv = tls_ClientHelloExtensionPermutationSetup(ss);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    if (isTLS || (ss->firstHsDone && ss->peerRequestedProtection)) {
        rv = ssl_ConstructExtensions(ss, &extensionBuf, ssl_hs_client_hello);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    if (IS_DTLS(ss)) {
        ssl3_DisableNonDTLSSuites(ss);
    }

    rv = ssl3_CreateClientHelloPreamble(ss, sid, requestingResume, version,
                                        PR_FALSE, &extensionBuf, &chBuf);
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl3_CreateClientHelloPreamble. */
    }

    if (!ss->ssl3.hs.echHpkeCtx) {
        if (extensionBuf.len) {
            rv = tls13_MaybeGreaseEch(ss, &chBuf, &extensionBuf);
            if (rv != SECSuccess) {
                goto loser; /* err set by tls13_MaybeGreaseEch. */
            }
            rv = ssl_InsertPaddingExtension(ss, chBuf.len, &extensionBuf);
            if (rv != SECSuccess) {
                goto loser; /* err set by ssl_InsertPaddingExtension. */
            }

            rv = ssl3_InsertChHeaderSize(ss, &chBuf, &extensionBuf);
            if (rv != SECSuccess) {
                goto loser; /* err set by ssl3_InsertChHeaderSize. */
            }

            /* If we are sending a PSK binder, replace the dummy value. */
            if (ssl3_ExtensionAdvertised(ss, ssl_tls13_pre_shared_key_xtn)) {
                rv = tls13_WriteExtensionsWithBinder(ss, &extensionBuf, &chBuf);
            } else {
                rv = sslBuffer_AppendNumber(&chBuf, extensionBuf.len, 2);
                if (rv != SECSuccess) {
                    goto loser;
                }
                rv = sslBuffer_AppendBuffer(&chBuf, &extensionBuf);
            }
            if (rv != SECSuccess) {
                goto loser; /* err set by sslBuffer_Append*. */
            }
        }

        /* If we already have a message in place, we need to enqueue it.
         * This empties the buffer. This is a convenient place to call
         * dtls_StageHandshakeMessage to mark the message boundary.  */
        if (IS_DTLS(ss)) {
            rv = dtls_StageHandshakeMessage(ss);
            if (rv != SECSuccess) {
                goto loser;
            }
        }
        rv = ssl3_AppendHandshake(ss, chBuf.buf, chBuf.len);
    } else {
        rv = tls13_ConstructClientHelloWithEch(ss, sid, !requestingResume, &chBuf, &extensionBuf);
        if (rv != SECSuccess) {
            goto loser; /* code set */
        }
        rv = ssl3_UpdateDefaultHandshakeHashes(ss, chBuf.buf, chBuf.len);
        if (rv != SECSuccess) {
            goto loser; /* code set */
        }

        if (IS_DTLS(ss)) {
            rv = dtls_StageHandshakeMessage(ss);
            if (rv != SECSuccess) {
                goto loser;
            }
        }
        /* By default, all messagess are added to both the inner and
         * outer transcripts. For CH (or CH2 if HRR), that's problematic. */
        rv = ssl3_AppendHandshakeSuppressHash(ss, chBuf.buf, chBuf.len);
    }
    if (rv != SECSuccess) {
        goto loser;
    }

    if (unlockNeeded) {
        /* Note: goto loser can't be used past this point. */
        PR_RWLock_Unlock(sid->u.ssl3.lock);
    }

    if (ss->xtnData.sentSessionTicketInClientHello) {
        SSL_AtomicIncrementLong(&ssl3stats.sch_sid_stateless_resumes);
    }

    if (ss->ssl3.hs.sendingSCSV) {
        /* Since we sent the SCSV, pretend we sent empty RI extension. */
        TLSExtensionData *xtnData = &ss->xtnData;
        xtnData->advertised[xtnData->numAdvertised++] =
            ssl_renegotiation_info_xtn;
    }

    flags = 0;
    rv = ssl3_FlushHandshake(ss, flags);
    if (rv != SECSuccess) {
        return rv; /* error code set by ssl3_FlushHandshake */
    }

    if (version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        rv = tls13_MaybeDo0RTTHandshake(ss);
        if (rv != SECSuccess) {
            return SECFailure; /* error code set already. */
        }
    }

    ss->ssl3.hs.ws = wait_server_hello;
    sslBuffer_Clear(&chBuf);
    sslBuffer_Clear(&extensionBuf);
    return SECSuccess;

loser:
    if (unlockNeeded) {
        PR_RWLock_Unlock(sid->u.ssl3.lock);
    }
    sslBuffer_Clear(&chBuf);
    sslBuffer_Clear(&extensionBuf);
    return SECFailure;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered a
 * complete ssl3 Hello Request.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleHelloRequest(sslSocket *ss)
{
    sslSessionID *sid = ss->sec.ci.sid;
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: handle hello_request handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->version < SSL_LIBRARY_VERSION_TLS_1_3);

    if (ss->ssl3.hs.ws == wait_server_hello)
        return SECSuccess;
    if (ss->ssl3.hs.ws != idle_handshake || ss->sec.isServer) {
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HELLO_REQUEST);
        return SECFailure;
    }
    if (ss->opt.enableRenegotiation == SSL_RENEGOTIATE_NEVER) {
        (void)SSL3_SendAlert(ss, alert_warning, no_renegotiation);
        PORT_SetError(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED);
        return SECFailure;
    }

    if (sid) {
        ssl_UncacheSessionID(ss);
        ssl_FreeSID(sid);
        ss->sec.ci.sid = NULL;
    }

    if (IS_DTLS(ss)) {
        dtls_RehandshakeCleanup(ss);
    }

    ssl_GetXmitBufLock(ss);
    rv = ssl3_SendClientHello(ss, client_hello_renegotiation);
    ssl_ReleaseXmitBufLock(ss);

    return rv;
}

static const CK_MECHANISM_TYPE wrapMechanismList[SSL_NUM_WRAP_MECHS] = {
    CKM_DES3_ECB,
    CKM_CAST5_ECB,
    CKM_DES_ECB,
    CKM_KEY_WRAP_LYNKS,
    CKM_IDEA_ECB,
    CKM_CAST3_ECB,
    CKM_CAST_ECB,
    CKM_RC5_ECB,
    CKM_RC2_ECB,
    CKM_CDMF_ECB,
    CKM_SKIPJACK_WRAP,
    CKM_SKIPJACK_CBC64,
    CKM_AES_ECB,
    CKM_CAMELLIA_ECB,
    CKM_SEED_ECB
};

static SECStatus
ssl_FindIndexByWrapMechanism(CK_MECHANISM_TYPE mech, unsigned int *wrapMechIndex)
{
    unsigned int i;
    for (i = 0; i < SSL_NUM_WRAP_MECHS; ++i) {
        if (wrapMechanismList[i] == mech) {
            *wrapMechIndex = i;
            return SECSuccess;
        }
    }
    PORT_Assert(0);
    PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
    return SECFailure;
}

/* Each process sharing the server session ID cache has its own array of SymKey
 * pointers for the symmetric wrapping keys that are used to wrap the master
 * secrets.  There is one key for each authentication type.  These Symkeys
 * correspond to the wrapped SymKeys kept in the server session cache.
 */
const SSLAuthType ssl_wrap_key_auth_type[SSL_NUM_WRAP_KEYS] = {
    ssl_auth_rsa_decrypt,
    ssl_auth_rsa_sign,
    ssl_auth_rsa_pss,
    ssl_auth_ecdsa,
    ssl_auth_ecdh_rsa,
    ssl_auth_ecdh_ecdsa
};

static SECStatus
ssl_FindIndexByWrapKey(const sslServerCert *serverCert, unsigned int *wrapKeyIndex)
{
    unsigned int i;
    for (i = 0; i < SSL_NUM_WRAP_KEYS; ++i) {
        if (SSL_CERT_IS(serverCert, ssl_wrap_key_auth_type[i])) {
            *wrapKeyIndex = i;
            return SECSuccess;
        }
    }
    /* Can't assert here because we still get people using DSA certificates. */
    PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
    return SECFailure;
}

static PK11SymKey *
ssl_UnwrapSymWrappingKey(
    SSLWrappedSymWrappingKey *pWswk,
    SECKEYPrivateKey *svrPrivKey,
    unsigned int wrapKeyIndex,
    CK_MECHANISM_TYPE masterWrapMech,
    void *pwArg)
{
    PK11SymKey *unwrappedWrappingKey = NULL;
    SECItem wrappedKey;
    PK11SymKey *Ks;
    SECKEYPublicKey pubWrapKey;
    ECCWrappedKeyInfo *ecWrapped;

    /* found the wrapping key on disk. */
    PORT_Assert(pWswk->symWrapMechanism == masterWrapMech);
    PORT_Assert(pWswk->wrapKeyIndex == wrapKeyIndex);
    if (pWswk->symWrapMechanism != masterWrapMech ||
        pWswk->wrapKeyIndex != wrapKeyIndex) {
        goto loser;
    }
    wrappedKey.type = siBuffer;
    wrappedKey.data = pWswk->wrappedSymmetricWrappingkey;
    wrappedKey.len = pWswk->wrappedSymKeyLen;
    PORT_Assert(wrappedKey.len <= sizeof pWswk->wrappedSymmetricWrappingkey);

    switch (ssl_wrap_key_auth_type[wrapKeyIndex]) {

        case ssl_auth_rsa_decrypt:
        case ssl_auth_rsa_sign: /* bad: see Bug 1248320 */
            unwrappedWrappingKey =
                PK11_PubUnwrapSymKey(svrPrivKey, &wrappedKey,
                                     masterWrapMech, CKA_UNWRAP, 0);
            break;

        case ssl_auth_ecdsa:
        case ssl_auth_ecdh_rsa:
        case ssl_auth_ecdh_ecdsa:
            /*
             * For ssl_auth_ecd*, we first create an EC public key based on
             * data stored with the wrappedSymmetricWrappingkey. Next,
             * we do an ECDH computation involving this public key and
             * the SSL server's (long-term) EC private key. The resulting
             * shared secret is treated the same way as Fortezza's Ks, i.e.,
             * it is used to recover the symmetric wrapping key.
             *
             * The data in wrappedSymmetricWrappingkey is laid out as defined
             * in the ECCWrappedKeyInfo structure.
             */
            ecWrapped = (ECCWrappedKeyInfo *)pWswk->wrappedSymmetricWrappingkey;

            PORT_Assert(ecWrapped->encodedParamLen + ecWrapped->pubValueLen +
                            ecWrapped->wrappedKeyLen <=
                        MAX_EC_WRAPPED_KEY_BUFLEN);

            if (ecWrapped->encodedParamLen + ecWrapped->pubValueLen +
                    ecWrapped->wrappedKeyLen >
                MAX_EC_WRAPPED_KEY_BUFLEN) {
                PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
                goto loser;
            }

            pubWrapKey.keyType = ecKey;
            pubWrapKey.u.ec.size = ecWrapped->size;
            pubWrapKey.u.ec.DEREncodedParams.len = ecWrapped->encodedParamLen;
            pubWrapKey.u.ec.DEREncodedParams.data = ecWrapped->var;
            pubWrapKey.u.ec.publicValue.len = ecWrapped->pubValueLen;
            pubWrapKey.u.ec.publicValue.data = ecWrapped->var +
                                               ecWrapped->encodedParamLen;

            wrappedKey.len = ecWrapped->wrappedKeyLen;
            wrappedKey.data = ecWrapped->var + ecWrapped->encodedParamLen +
                              ecWrapped->pubValueLen;

            /* Derive Ks using ECDH */
            Ks = PK11_PubDeriveWithKDF(svrPrivKey, &pubWrapKey, PR_FALSE, NULL,
                                       NULL, CKM_ECDH1_DERIVE, masterWrapMech,
                                       CKA_DERIVE, 0, CKD_NULL, NULL, NULL);
            if (Ks == NULL) {
                goto loser;
            }

            /*  Use Ks to unwrap the wrapping key */
            unwrappedWrappingKey = PK11_UnwrapSymKey(Ks, masterWrapMech, NULL,
                                                     &wrappedKey, masterWrapMech,
                                                     CKA_UNWRAP, 0);
            PK11_FreeSymKey(Ks);

            break;

        default:
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            goto loser;
    }
loser:
    return unwrappedWrappingKey;
}

typedef struct {
    PK11SymKey *symWrapKey[SSL_NUM_WRAP_KEYS];
} ssl3SymWrapKey;

static PZLock *symWrapKeysLock = NULL;
static ssl3SymWrapKey symWrapKeys[SSL_NUM_WRAP_MECHS];

SECStatus
ssl_FreeSymWrapKeysLock(void)
{
    if (symWrapKeysLock) {
        PZ_DestroyLock(symWrapKeysLock);
        symWrapKeysLock = NULL;
        return SECSuccess;
    }
    PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
    return SECFailure;
}

SECStatus
SSL3_ShutdownServerCache(void)
{
    int i, j;

    if (!symWrapKeysLock)
        return SECSuccess; /* lock was never initialized */
    PZ_Lock(symWrapKeysLock);
    /* get rid of all symWrapKeys */
    for (i = 0; i < SSL_NUM_WRAP_MECHS; ++i) {
        for (j = 0; j < SSL_NUM_WRAP_KEYS; ++j) {
            PK11SymKey **pSymWrapKey;
            pSymWrapKey = &symWrapKeys[i].symWrapKey[j];
            if (*pSymWrapKey) {
                PK11_FreeSymKey(*pSymWrapKey);
                *pSymWrapKey = NULL;
            }
        }
    }

    PZ_Unlock(symWrapKeysLock);
    ssl_FreeSessionCacheLocks();
    return SECSuccess;
}

SECStatus
ssl_InitSymWrapKeysLock(void)
{
    symWrapKeysLock = PZ_NewLock(nssILockOther);
    return symWrapKeysLock ? SECSuccess : SECFailure;
}

/* Try to get wrapping key for mechanism from in-memory array.
 * If that fails, look for one on disk.
 * If that fails, generate a new one, put the new one on disk,
 * Put the new key in the in-memory array.
 *
 * Note that this function performs some fairly inadvisable functions with
 * certificate private keys.  ECDSA keys are used with ECDH; similarly, RSA
 * signing keys are used to encrypt.  Bug 1248320.
 */
PK11SymKey *
ssl3_GetWrappingKey(sslSocket *ss,
                    PK11SlotInfo *masterSecretSlot,
                    CK_MECHANISM_TYPE masterWrapMech,
                    void *pwArg)
{
    SSLAuthType authType;
    SECKEYPrivateKey *svrPrivKey;
    SECKEYPublicKey *svrPubKey = NULL;
    PK11SymKey *unwrappedWrappingKey = NULL;
    PK11SymKey **pSymWrapKey;
    CK_MECHANISM_TYPE asymWrapMechanism = CKM_INVALID_MECHANISM;
    int length;
    unsigned int wrapMechIndex;
    unsigned int wrapKeyIndex;
    SECStatus rv;
    SECItem wrappedKey;
    SSLWrappedSymWrappingKey wswk;
    PK11SymKey *Ks = NULL;
    SECKEYPublicKey *pubWrapKey = NULL;
    SECKEYPrivateKey *privWrapKey = NULL;
    ECCWrappedKeyInfo *ecWrapped;
    const sslServerCert *serverCert = ss->sec.serverCert;

    PORT_Assert(serverCert);
    PORT_Assert(serverCert->serverKeyPair);
    PORT_Assert(serverCert->serverKeyPair->privKey);
    PORT_Assert(serverCert->serverKeyPair->pubKey);
    if (!serverCert || !serverCert->serverKeyPair ||
        !serverCert->serverKeyPair->privKey ||
        !serverCert->serverKeyPair->pubKey) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return NULL; /* hmm */
    }

    rv = ssl_FindIndexByWrapKey(serverCert, &wrapKeyIndex);
    if (rv != SECSuccess)
        return NULL; /* unusable wrapping key. */

    rv = ssl_FindIndexByWrapMechanism(masterWrapMech, &wrapMechIndex);
    if (rv != SECSuccess)
        return NULL; /* invalid masterWrapMech. */

    authType = ssl_wrap_key_auth_type[wrapKeyIndex];
    svrPrivKey = serverCert->serverKeyPair->privKey;
    pSymWrapKey = &symWrapKeys[wrapMechIndex].symWrapKey[wrapKeyIndex];

    ssl_InitSessionCacheLocks(PR_TRUE);

    PZ_Lock(symWrapKeysLock);

    unwrappedWrappingKey = *pSymWrapKey;
    if (unwrappedWrappingKey != NULL) {
        if (PK11_VerifyKeyOK(unwrappedWrappingKey)) {
            unwrappedWrappingKey = PK11_ReferenceSymKey(unwrappedWrappingKey);
            goto done;
        }
        /* slot series has changed, so this key is no good any more. */
        PK11_FreeSymKey(unwrappedWrappingKey);
        *pSymWrapKey = unwrappedWrappingKey = NULL;
    }

    /* Try to get wrapped SymWrapping key out of the (disk) cache. */
    /* Following call fills in wswk on success. */
    rv = ssl_GetWrappingKey(wrapMechIndex, wrapKeyIndex, &wswk);
    if (rv == SECSuccess) {
        /* found the wrapped sym wrapping key on disk. */
        unwrappedWrappingKey =
            ssl_UnwrapSymWrappingKey(&wswk, svrPrivKey, wrapKeyIndex,
                                     masterWrapMech, pwArg);
        if (unwrappedWrappingKey) {
            goto install;
        }
    }

    if (!masterSecretSlot) /* caller doesn't want to create a new one. */
        goto loser;

    length = PK11_GetBestKeyLength(masterSecretSlot, masterWrapMech);
    /* Zero length means fixed key length algorithm, or error.
     * It's ambiguous.
     */
    unwrappedWrappingKey = PK11_KeyGen(masterSecretSlot, masterWrapMech, NULL,
                                       length, pwArg);
    if (!unwrappedWrappingKey) {
        goto loser;
    }

    /* Prepare the buffer to receive the wrappedWrappingKey,
     * the symmetric wrapping key wrapped using the server's pub key.
     */
    PORT_Memset(&wswk, 0, sizeof wswk); /* eliminate UMRs. */

    svrPubKey = serverCert->serverKeyPair->pubKey;
    wrappedKey.type = siBuffer;
    wrappedKey.len = SECKEY_PublicKeyStrength(svrPubKey);
    wrappedKey.data = wswk.wrappedSymmetricWrappingkey;

    PORT_Assert(wrappedKey.len <= sizeof wswk.wrappedSymmetricWrappingkey);
    if (wrappedKey.len > sizeof wswk.wrappedSymmetricWrappingkey)
        goto loser;

    /* wrap symmetric wrapping key in server's public key. */
    switch (authType) {
        case ssl_auth_rsa_decrypt:
        case ssl_auth_rsa_sign: /* bad: see Bug 1248320 */
        case ssl_auth_rsa_pss:
            asymWrapMechanism = CKM_RSA_PKCS;
            rv = PK11_PubWrapSymKey(asymWrapMechanism, svrPubKey,
                                    unwrappedWrappingKey, &wrappedKey);
            break;

        case ssl_auth_ecdsa:
        case ssl_auth_ecdh_rsa:
        case ssl_auth_ecdh_ecdsa:
            /*
             * We generate an ephemeral EC key pair. Perform an ECDH
             * computation involving this ephemeral EC public key and
             * the SSL server's (long-term) EC private key. The resulting
             * shared secret is treated in the same way as Fortezza's Ks,
             * i.e., it is used to wrap the wrapping key. To facilitate
             * unwrapping in ssl_UnwrapWrappingKey, we also store all
             * relevant info about the ephemeral EC public key in
             * wswk.wrappedSymmetricWrappingkey and lay it out as
             * described in the ECCWrappedKeyInfo structure.
             */
            PORT_Assert(SECKEY_GetPublicKeyType(svrPubKey) == ecKey);
            if (SECKEY_GetPublicKeyType(svrPubKey) != ecKey) {
                /* something is wrong in sslsecur.c if this isn't an ecKey */
                PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
                rv = SECFailure;
                goto ec_cleanup;
            }

            privWrapKey = SECKEY_CreateECPrivateKey(
                &svrPubKey->u.ec.DEREncodedParams, &pubWrapKey, NULL);
            if ((privWrapKey == NULL) || (pubWrapKey == NULL)) {
                rv = SECFailure;
                goto ec_cleanup;
            }

            /* Set the key size in bits */
            if (pubWrapKey->u.ec.size == 0) {
                pubWrapKey->u.ec.size = SECKEY_PublicKeyStrengthInBits(svrPubKey);
            }

            PORT_Assert(pubWrapKey->u.ec.DEREncodedParams.len +
                            pubWrapKey->u.ec.publicValue.len <
                        MAX_EC_WRAPPED_KEY_BUFLEN);
            if (pubWrapKey->u.ec.DEREncodedParams.len +
                    pubWrapKey->u.ec.publicValue.len >=
                MAX_EC_WRAPPED_KEY_BUFLEN) {
                PORT_SetError(SEC_ERROR_INVALID_KEY);
                rv = SECFailure;
                goto ec_cleanup;
            }

            /* Derive Ks using ECDH */
            Ks = PK11_PubDeriveWithKDF(svrPrivKey, pubWrapKey, PR_FALSE, NULL,
                                       NULL, CKM_ECDH1_DERIVE, masterWrapMech,
                                       CKA_DERIVE, 0, CKD_NULL, NULL, NULL);
            if (Ks == NULL) {
                rv = SECFailure;
                goto ec_cleanup;
            }

            ecWrapped = (ECCWrappedKeyInfo *)(wswk.wrappedSymmetricWrappingkey);
            ecWrapped->size = pubWrapKey->u.ec.size;
            ecWrapped->encodedParamLen = pubWrapKey->u.ec.DEREncodedParams.len;
            PORT_Memcpy(ecWrapped->var, pubWrapKey->u.ec.DEREncodedParams.data,
                        pubWrapKey->u.ec.DEREncodedParams.len);

            ecWrapped->pubValueLen = pubWrapKey->u.ec.publicValue.len;
            PORT_Memcpy(ecWrapped->var + ecWrapped->encodedParamLen,
                        pubWrapKey->u.ec.publicValue.data,
                        pubWrapKey->u.ec.publicValue.len);

            wrappedKey.len = MAX_EC_WRAPPED_KEY_BUFLEN -
                             (ecWrapped->encodedParamLen + ecWrapped->pubValueLen);
            wrappedKey.data = ecWrapped->var + ecWrapped->encodedParamLen +
                              ecWrapped->pubValueLen;

            /* wrap symmetricWrapping key with the local Ks */
            rv = PK11_WrapSymKey(masterWrapMech, NULL, Ks,
                                 unwrappedWrappingKey, &wrappedKey);

            if (rv != SECSuccess) {
                goto ec_cleanup;
            }

            /* Write down the length of wrapped key in the buffer
             * wswk.wrappedSymmetricWrappingkey at the appropriate offset
             */
            ecWrapped->wrappedKeyLen = wrappedKey.len;

        ec_cleanup:
            if (privWrapKey)
                SECKEY_DestroyPrivateKey(privWrapKey);
            if (pubWrapKey)
                SECKEY_DestroyPublicKey(pubWrapKey);
            if (Ks)
                PK11_FreeSymKey(Ks);
            asymWrapMechanism = masterWrapMech;
            break;

        default:
            rv = SECFailure;
            break;
    }

    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    PORT_Assert(asymWrapMechanism != CKM_INVALID_MECHANISM);

    wswk.symWrapMechanism = masterWrapMech;
    wswk.asymWrapMechanism = asymWrapMechanism;
    wswk.wrapMechIndex = wrapMechIndex;
    wswk.wrapKeyIndex = wrapKeyIndex;
    wswk.wrappedSymKeyLen = wrappedKey.len;

    /* put it on disk. */
    /* If the wrapping key for this KEA type has already been set,
     * then abandon the value we just computed and
     * use the one we got from the disk.
     */
    rv = ssl_SetWrappingKey(&wswk);
    if (rv == SECSuccess) {
        /* somebody beat us to it.  The original contents of our wswk
         * has been replaced with the content on disk.  Now, discard
         * the key we just created and unwrap this new one.
         */
        PK11_FreeSymKey(unwrappedWrappingKey);

        unwrappedWrappingKey =
            ssl_UnwrapSymWrappingKey(&wswk, svrPrivKey, wrapKeyIndex,
                                     masterWrapMech, pwArg);
    }

install:
    if (unwrappedWrappingKey) {
        *pSymWrapKey = PK11_ReferenceSymKey(unwrappedWrappingKey);
    }

loser:
done:
    PZ_Unlock(symWrapKeysLock);
    return unwrappedWrappingKey;
}

#ifdef NSS_ALLOW_SSLKEYLOGFILE
/* hexEncode hex encodes |length| bytes from |in| and writes it as |length*2|
 * bytes to |out|. */
static void
hexEncode(char *out, const unsigned char *in, unsigned int length)
{
    static const char hextable[] = "0123456789abcdef";
    unsigned int i;

    for (i = 0; i < length; i++) {
        *(out++) = hextable[in[i] >> 4];
        *(out++) = hextable[in[i] & 15];
    }
}
#endif

/* Called from ssl3_SendClientKeyExchange(). */
static SECStatus
ssl3_SendRSAClientKeyExchange(sslSocket *ss, SECKEYPublicKey *svrPubKey)
{
    PK11SymKey *pms = NULL;
    SECStatus rv = SECFailure;
    SECItem enc_pms = { siBuffer, NULL, 0 };
    PRBool isTLS;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    /* Generate the pre-master secret ...  */
    ssl_GetSpecWriteLock(ss);
    isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);

    pms = ssl3_GenerateRSAPMS(ss, ss->ssl3.pwSpec, NULL);
    ssl_ReleaseSpecWriteLock(ss);
    if (pms == NULL) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    /* Get the wrapped (encrypted) pre-master secret, enc_pms */
    unsigned int svrPubKeyBits = SECKEY_PublicKeyStrengthInBits(svrPubKey);
    enc_pms.len = (svrPubKeyBits + 7) / 8;
    /* Check that the RSA key isn't larger than 8k bit. */
    if (svrPubKeyBits > SSL_MAX_RSA_KEY_BITS) {
        (void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }
    enc_pms.data = (unsigned char *)PORT_Alloc(enc_pms.len);
    if (enc_pms.data == NULL) {
        goto loser; /* err set by PORT_Alloc */
    }

    /* Wrap pre-master secret in server's public key. */
    rv = PK11_PubWrapSymKey(CKM_RSA_PKCS, svrPubKey, pms, &enc_pms);
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

#ifdef TRACE
    if (ssl_trace >= 100) {
        SECStatus extractRV = PK11_ExtractKeyValue(pms);
        if (extractRV == SECSuccess) {
            SECItem *keyData = PK11_GetKeyData(pms);
            if (keyData && keyData->data && keyData->len) {
                ssl_PrintBuf(ss, "Pre-Master Secret",
                             keyData->data, keyData->len);
            }
        }
    }
#endif

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_client_key_exchange,
                                    isTLS ? enc_pms.len + 2
                                          : enc_pms.len);
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl3_AppendHandshake* */
    }
    if (isTLS) {
        rv = ssl3_AppendHandshakeVariable(ss, enc_pms.data, enc_pms.len, 2);
    } else {
        rv = ssl3_AppendHandshake(ss, enc_pms.data, enc_pms.len);
    }
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl3_AppendHandshake* */
    }

    rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);
    PK11_FreeSymKey(pms);
    pms = NULL;

    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    rv = SECSuccess;

loser:
    if (enc_pms.data != NULL) {
        PORT_Free(enc_pms.data);
    }
    if (pms != NULL) {
        PK11_FreeSymKey(pms);
    }
    return rv;
}

/* DH shares need to be padded to the size of their prime.  Some implementations
 * require this.  TLS 1.3 also requires this. */
SECStatus
ssl_AppendPaddedDHKeyShare(sslBuffer *buf, const SECKEYPublicKey *pubKey,
                           PRBool appendLength)
{
    SECStatus rv;
    unsigned int pad = pubKey->u.dh.prime.len - pubKey->u.dh.publicValue.len;

    if (appendLength) {
        rv = sslBuffer_AppendNumber(buf, pubKey->u.dh.prime.len, 2);
        if (rv != SECSuccess) {
            return rv;
        }
    }
    while (pad) {
        rv = sslBuffer_AppendNumber(buf, 0, 1);
        if (rv != SECSuccess) {
            return rv;
        }
        --pad;
    }
    rv = sslBuffer_Append(buf, pubKey->u.dh.publicValue.data,
                          pubKey->u.dh.publicValue.len);
    if (rv != SECSuccess) {
        return rv;
    }
    return SECSuccess;
}

/* Called from ssl3_SendClientKeyExchange(). */
static SECStatus
ssl3_SendDHClientKeyExchange(sslSocket *ss, SECKEYPublicKey *svrPubKey)
{
    PK11SymKey *pms = NULL;
    SECStatus rv;
    PRBool isTLS;
    CK_MECHANISM_TYPE target;

    const ssl3DHParams *params;
    ssl3DHParams customParams;
    const sslNamedGroupDef *groupDef;
    static const sslNamedGroupDef customGroupDef = {
        ssl_grp_ffdhe_custom, 0, ssl_kea_dh, SEC_OID_TLS_DHE_CUSTOM, PR_FALSE
    };
    sslEphemeralKeyPair *keyPair = NULL;
    SECKEYPublicKey *pubKey;
    PRUint8 dhData[SSL_MAX_DH_KEY_BITS / 8 + 2];
    sslBuffer dhBuf = SSL_BUFFER(dhData);

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);

    /* Copy DH parameters from server key */

    if (SECKEY_GetPublicKeyType(svrPubKey) != dhKey) {
        PORT_SetError(SEC_ERROR_BAD_KEY);
        return SECFailure;
    }

    /* Work out the parameters. */
    rv = ssl_ValidateDHENamedGroup(ss, &svrPubKey->u.dh.prime,
                                   &svrPubKey->u.dh.base,
                                   &groupDef, &params);
    if (rv != SECSuccess) {
        /* If we require named groups, we will have already validated the group
         * in ssl_HandleDHServerKeyExchange() */
        PORT_Assert(!ss->opt.requireDHENamedGroups &&
                    !ss->xtnData.peerSupportsFfdheGroups);

        customParams.name = ssl_grp_ffdhe_custom;
        customParams.prime.data = svrPubKey->u.dh.prime.data;
        customParams.prime.len = svrPubKey->u.dh.prime.len;
        customParams.base.data = svrPubKey->u.dh.base.data;
        customParams.base.len = svrPubKey->u.dh.base.len;
        params = &customParams;
        groupDef = &customGroupDef;
    }
    ss->sec.keaGroup = groupDef;

    rv = ssl_CreateDHEKeyPair(groupDef, params, &keyPair);
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
        goto loser;
    }
    pubKey = keyPair->keys->pubKey;
    PRINT_BUF(50, (ss, "DH public value:",
                   pubKey->u.dh.publicValue.data,
                   pubKey->u.dh.publicValue.len));

    if (isTLS)
        target = CKM_TLS_MASTER_KEY_DERIVE_DH;
    else
        target = CKM_SSL3_MASTER_KEY_DERIVE_DH;

    /* Determine the PMS */
    pms = PK11_PubDerive(keyPair->keys->privKey, svrPubKey,
                         PR_FALSE, NULL, NULL, CKM_DH_PKCS_DERIVE,
                         target, CKA_DERIVE, 0, NULL);

    if (pms == NULL) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    /* Note: send the DH share padded to avoid triggering bugs. */
    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_client_key_exchange,
                                    params->prime.len + 2);
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl3_AppendHandshake* */
    }
    rv = ssl_AppendPaddedDHKeyShare(&dhBuf, pubKey, PR_TRUE);
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl_AppendPaddedDHKeyShare */
    }
    rv = ssl3_AppendBufferToHandshake(ss, &dhBuf);
    if (rv != SECSuccess) {
        goto loser; /* err set by ssl3_AppendBufferToHandshake */
    }

    rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    sslBuffer_Clear(&dhBuf);
    PK11_FreeSymKey(pms);
    ssl_FreeEphemeralKeyPair(keyPair);
    return SECSuccess;

loser:
    if (pms)
        PK11_FreeSymKey(pms);
    if (keyPair)
        ssl_FreeEphemeralKeyPair(keyPair);
    sslBuffer_Clear(&dhBuf);
    return SECFailure;
}

/* Called from ssl3_HandleServerHelloDone(). */
static SECStatus
ssl3_SendClientKeyExchange(sslSocket *ss)
{
    SECKEYPublicKey *serverKey = NULL;
    SECStatus rv = SECFailure;

    SSL_TRC(3, ("%d: SSL3[%d]: send client_key_exchange handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->sec.peerKey == NULL) {
        serverKey = CERT_ExtractPublicKey(ss->sec.peerCert);
        if (serverKey == NULL) {
            ssl_MapLowLevelError(SSL_ERROR_EXTRACT_PUBLIC_KEY_FAILURE);
            return SECFailure;
        }
    } else {
        serverKey = ss->sec.peerKey;
        ss->sec.peerKey = NULL; /* we're done with it now */
    }

    ss->sec.keaType = ss->ssl3.hs.kea_def->exchKeyType;
    ss->sec.keaKeyBits = SECKEY_PublicKeyStrengthInBits(serverKey);

    switch (ss->ssl3.hs.kea_def->exchKeyType) {
        case ssl_kea_rsa:
            rv = ssl3_SendRSAClientKeyExchange(ss, serverKey);
            break;

        case ssl_kea_dh:
            rv = ssl3_SendDHClientKeyExchange(ss, serverKey);
            break;

        case ssl_kea_ecdh:
            rv = ssl3_SendECDHClientKeyExchange(ss, serverKey);
            break;

        default:
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            break;
    }

    SSL_TRC(3, ("%d: SSL3[%d]: DONE sending client_key_exchange",
                SSL_GETPID(), ss->fd));

    SECKEY_DestroyPublicKey(serverKey);
    return rv; /* err code already set. */
}

/* Used by ssl_PickSignatureScheme(). */
PRBool
ssl_CanUseSignatureScheme(SSLSignatureScheme scheme,
                          const SSLSignatureScheme *peerSchemes,
                          unsigned int peerSchemeCount,
                          PRBool requireSha1,
                          PRBool slotDoesPss)
{
    SSLHashType hashType;
    unsigned int i;

    /* Skip RSA-PSS schemes when the certificate's private key slot does
     * not support this signature mechanism. */
    if (ssl_IsRsaPssSignatureScheme(scheme) && !slotDoesPss) {
        return PR_FALSE;
    }

    hashType = ssl_SignatureSchemeToHashType(scheme);
    if (requireSha1 && (hashType != ssl_hash_sha1)) {
        return PR_FALSE;
    }

    if (!ssl_SchemePolicyOK(scheme, kSSLSigSchemePolicy)) {
        return PR_FALSE;
    }

    for (i = 0; i < peerSchemeCount; i++) {
        if (peerSchemes[i] == scheme) {
            return PR_TRUE;
        }
    }
    return PR_FALSE;
}

SECStatus
ssl_PrivateKeySupportsRsaPss(SECKEYPrivateKey *privKey, CERTCertificate *cert,
                             void *pwarg, PRBool *supportsRsaPss)
{
    PK11SlotInfo *slot = NULL;
    if (privKey) {
        slot = PK11_GetSlotFromPrivateKey(privKey);
    } else {
        CK_OBJECT_HANDLE certID = PK11_FindObjectForCert(cert, pwarg, &slot);
        if (certID == CK_INVALID_HANDLE) {
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }
    }
    if (!slot) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }
    *supportsRsaPss = PK11_DoesMechanism(slot, auth_alg_defs[ssl_auth_rsa_pss]);
    PK11_FreeSlot(slot);
    return SECSuccess;
}

SECStatus
ssl_PickSignatureScheme(sslSocket *ss,
                        CERTCertificate *cert,
                        SECKEYPublicKey *pubKey,
                        SECKEYPrivateKey *privKey,
                        const SSLSignatureScheme *peerSchemes,
                        unsigned int peerSchemeCount,
                        PRBool requireSha1,
                        SSLSignatureScheme *schemePtr)
{
    unsigned int i;
    PRBool doesRsaPss;
    PRBool isTLS13 = ss->version >= SSL_LIBRARY_VERSION_TLS_1_3;
    SECStatus rv;
    SSLSignatureScheme scheme;
    SECOidTag spkiOid;

    /* We can't require SHA-1 in TLS 1.3. */
    PORT_Assert(!(requireSha1 && isTLS13));
    if (!pubKey || !cert) {
        PORT_Assert(0);
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }
    rv = ssl_PrivateKeySupportsRsaPss(privKey, cert, ss->pkcs11PinArg,
                                      &doesRsaPss);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    /* If the certificate SPKI indicates a single scheme, don't search. */
    rv = ssl_SignatureSchemeFromSpki(&cert->subjectPublicKeyInfo,
                                     isTLS13, &scheme);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (scheme != ssl_sig_none) {
        if (!ssl_SignatureSchemeEnabled(ss, scheme) ||
            !ssl_CanUseSignatureScheme(scheme, peerSchemes, peerSchemeCount,
                                       requireSha1, doesRsaPss)) {
            PORT_SetError(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
            return SECFailure;
        }
        *schemePtr = scheme;
        return SECSuccess;
    }

    spkiOid = SECOID_GetAlgorithmTag(&cert->subjectPublicKeyInfo.algorithm);
    if (spkiOid == SEC_OID_UNKNOWN) {
        return SECFailure;
    }

    /* Now we have to search based on the key type. Go through our preferred
     * schemes in order and find the first that can be used. */
    for (i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        scheme = ss->ssl3.signatureSchemes[i];

        if (ssl_SignatureSchemeValid(scheme, spkiOid, isTLS13) &&
            ssl_CanUseSignatureScheme(scheme, peerSchemes, peerSchemeCount,
                                      requireSha1, doesRsaPss)) {
            *schemePtr = scheme;
            return SECSuccess;
        }
    }

    PORT_SetError(SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM);
    return SECFailure;
}

static SECStatus
ssl_PickFallbackSignatureScheme(sslSocket *ss, SECKEYPublicKey *pubKey)
{
    PRBool isTLS12 = ss->version >= SSL_LIBRARY_VERSION_TLS_1_2;

    switch (SECKEY_GetPublicKeyType(pubKey)) {
        case rsaKey:
            if (isTLS12) {
                ss->ssl3.hs.signatureScheme = ssl_sig_rsa_pkcs1_sha1;
            } else {
                ss->ssl3.hs.signatureScheme = ssl_sig_rsa_pkcs1_sha1md5;
            }
            break;
        case ecKey:
            ss->ssl3.hs.signatureScheme = ssl_sig_ecdsa_sha1;
            break;
        case dsaKey:
            ss->ssl3.hs.signatureScheme = ssl_sig_dsa_sha1;
            break;
        default:
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_INVALID_KEY);
            return SECFailure;
    }
    return SECSuccess;
}

/* ssl3_PickServerSignatureScheme selects a signature scheme for signing the
 * handshake.  Most of this is determined by the key pair we are using.
 * Prior to TLS 1.2, the MD5/SHA1 combination is always used. With TLS 1.2, a
 * client may advertise its support for signature and hash combinations. */
static SECStatus
ssl3_PickServerSignatureScheme(sslSocket *ss)
{
    const sslServerCert *cert = ss->sec.serverCert;
    PRBool isTLS12 = ss->version >= SSL_LIBRARY_VERSION_TLS_1_2;

    if (!isTLS12 || !ssl3_ExtensionNegotiated(ss, ssl_signature_algorithms_xtn)) {
        /* If the client didn't provide any signature_algorithms extension then
         * we can assume that they support SHA-1: RFC5246, Section 7.4.1.4.1. */
        return ssl_PickFallbackSignatureScheme(ss, cert->serverKeyPair->pubKey);
    }

    /* Sets error code, if needed. */
    return ssl_PickSignatureScheme(ss, cert->serverCert,
                                   cert->serverKeyPair->pubKey,
                                   cert->serverKeyPair->privKey,
                                   ss->xtnData.sigSchemes,
                                   ss->xtnData.numSigSchemes,
                                   PR_FALSE /* requireSha1 */,
                                   &ss->ssl3.hs.signatureScheme);
}

SECStatus
ssl_PickClientSignatureScheme(sslSocket *ss, CERTCertificate *clientCertificate,
                              SECKEYPrivateKey *privKey,
                              const SSLSignatureScheme *schemes,
                              unsigned int numSchemes,
                              SSLSignatureScheme *schemePtr)
{
    SECStatus rv;
    PRBool isTLS13 = (PRBool)ss->version >= SSL_LIBRARY_VERSION_TLS_1_3;
    SECKEYPublicKey *pubKey = CERT_ExtractPublicKey(clientCertificate);

    PORT_Assert(pubKey);

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        /* We should have already checked that a signature scheme was
         * listed in the request. */
        PORT_Assert(schemes && numSchemes > 0);
    }

    if (!isTLS13 &&
        (SECKEY_GetPublicKeyType(pubKey) == rsaKey ||
         SECKEY_GetPublicKeyType(pubKey) == dsaKey) &&
        SECKEY_PublicKeyStrengthInBits(pubKey) <= 1024) {
        /* If the key is a 1024-bit RSA or DSA key, assume conservatively that
         * it may be unable to sign SHA-256 hashes. This is the case for older
         * Estonian ID cards that have 1024-bit RSA keys. In FIPS 186-2 and
         * older, DSA key size is at most 1024 bits and the hash function must
         * be SHA-1.
         */
        rv = ssl_PickSignatureScheme(ss, clientCertificate,
                                     pubKey, privKey, schemes, numSchemes,
                                     PR_TRUE /* requireSha1 */, schemePtr);
        if (rv == SECSuccess) {
            SECKEY_DestroyPublicKey(pubKey);
            return SECSuccess;
        }
        /* If this fails, that's because the peer doesn't advertise SHA-1,
         * so fall back to the full negotiation. */
    }
    rv = ssl_PickSignatureScheme(ss, clientCertificate,
                                 pubKey, privKey, schemes, numSchemes,
                                 PR_FALSE /* requireSha1 */, schemePtr);
    SECKEY_DestroyPublicKey(pubKey);
    return rv;
}

/* Called from ssl3_HandleServerHelloDone(). */
static SECStatus
ssl3_SendCertificateVerify(sslSocket *ss, SECKEYPrivateKey *privKey)
{
    SECStatus rv = SECFailure;
    PRBool isTLS12;
    SECItem buf = { siBuffer, NULL, 0 };
    SSL3Hashes hashes;
    unsigned int len;
    SSLHashType hashAlg;

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    SSL_TRC(3, ("%d: SSL3[%d]: send certificate_verify handshake",
                SSL_GETPID(), ss->fd));

    ssl_GetSpecReadLock(ss);

    if (ss->ssl3.hs.hashType == handshake_hash_record) {
        hashAlg = ssl_SignatureSchemeToHashType(ss->ssl3.hs.signatureScheme);
    } else {
        /* Use ssl_hash_none to represent the MD5+SHA1 combo. */
        hashAlg = ssl_hash_none;
    }
    if (ss->ssl3.hs.hashType == handshake_hash_record &&
        hashAlg != ssl3_GetSuitePrfHash(ss)) {
        rv = ssl3_ComputeHandshakeHash(ss->ssl3.hs.messages.buf,
                                       ss->ssl3.hs.messages.len,
                                       hashAlg, &hashes);
        if (rv != SECSuccess) {
            ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE);
        }
    } else {
        rv = ssl3_ComputeHandshakeHashes(ss, ss->ssl3.pwSpec, &hashes, 0);
    }
    ssl_ReleaseSpecReadLock(ss);
    if (rv != SECSuccess) {
        goto done; /* err code was set by ssl3_ComputeHandshakeHash(es) */
    }

    isTLS12 = (PRBool)(ss->version == SSL_LIBRARY_VERSION_TLS_1_2);
    PORT_Assert(ss->version <= SSL_LIBRARY_VERSION_TLS_1_2);

    rv = ssl3_SignHashes(ss, &hashes, privKey, &buf);
    if (rv == SECSuccess && !ss->sec.isServer) {
        /* Remember the info about the slot that did the signing.
        ** Later, when doing an SSL restart handshake, verify this.
        ** These calls are mere accessors, and can't fail.
        */
        PK11SlotInfo *slot;
        sslSessionID *sid = ss->sec.ci.sid;

        slot = PK11_GetSlotFromPrivateKey(privKey);
        sid->u.ssl3.clAuthSeries = PK11_GetSlotSeries(slot);
        sid->u.ssl3.clAuthSlotID = PK11_GetSlotID(slot);
        sid->u.ssl3.clAuthModuleID = PK11_GetModuleID(slot);
        sid->u.ssl3.clAuthValid = PR_TRUE;
        PK11_FreeSlot(slot);
    }
    if (rv != SECSuccess) {
        goto done; /* err code was set by ssl3_SignHashes */
    }

    len = buf.len + 2 + (isTLS12 ? 2 : 0);

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate_verify, len);
    if (rv != SECSuccess) {
        goto done; /* error code set by AppendHandshake */
    }
    if (isTLS12) {
        rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.signatureScheme, 2);
        if (rv != SECSuccess) {
            goto done; /* err set by AppendHandshake. */
        }
    }
    rv = ssl3_AppendHandshakeVariable(ss, buf.data, buf.len, 2);
    if (rv != SECSuccess) {
        goto done; /* error code set by AppendHandshake */
    }

done:
    if (buf.data)
        PORT_Free(buf.data);
    return rv;
}

/* Once a cipher suite has been selected, make sure that the necessary secondary
 * information is properly set. */
SECStatus
ssl3_SetupCipherSuite(sslSocket *ss, PRBool initHashes)
{
    ss->ssl3.hs.suite_def = ssl_LookupCipherSuiteDef(ss->ssl3.hs.cipher_suite);
    if (!ss->ssl3.hs.suite_def) {
        PORT_Assert(0);
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    ss->ssl3.hs.kea_def = &kea_defs[ss->ssl3.hs.suite_def->key_exchange_alg];
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_cipher_suite;

    if (!initHashes) {
        return SECSuccess;
    }
    /* Now we have a cipher suite, initialize the handshake hashes. */
    return ssl3_InitHandshakeHashes(ss);
}

SECStatus
ssl_ClientSetCipherSuite(sslSocket *ss, SSL3ProtocolVersion version,
                         ssl3CipherSuite suite, PRBool initHashes)
{
    unsigned int i;
    if (ssl3_config_match_init(ss) == 0) {
        PORT_Assert(PR_FALSE);
        return SECFailure;
    }
    for (i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        ssl3CipherSuiteCfg *suiteCfg = &ss->cipherSuites[i];
        if (suite == suiteCfg->cipher_suite) {
            SSLVersionRange vrange = { version, version };
            if (!ssl3_config_match(suiteCfg, ss->ssl3.policy, &vrange, ss)) {
                /* config_match already checks whether the cipher suite is
                 * acceptable for the version, but the check is repeated here
                 * in order to give a more precise error code. */
                if (!ssl3_CipherSuiteAllowedForVersionRange(suite, &vrange)) {
                    PORT_SetError(SSL_ERROR_CIPHER_DISALLOWED_FOR_VERSION);
                } else {
                    PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
                }
                return SECFailure;
            }
            break;
        }
    }
    if (i >= ssl_V3_SUITES_IMPLEMENTED) {
        PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
        return SECFailure;
    }

    /* Don't let the server change its mind. */
    if (ss->ssl3.hs.helloRetry && suite != ss->ssl3.hs.cipher_suite) {
        (void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
        return SECFailure;
    }

    ss->ssl3.hs.cipher_suite = (ssl3CipherSuite)suite;
    return ssl3_SetupCipherSuite(ss, initHashes);
}

/* Check that session ID we received from the server, if any, matches our
 * expectations, depending on whether we're in compat mode and whether we
 * negotiated TLS 1.3+ or TLS 1.2-.
 */
static PRBool
ssl_CheckServerSessionIdCorrectness(sslSocket *ss, SECItem *sidBytes)
{
    sslSessionID *sid = ss->sec.ci.sid;
    PRBool sidMatch = PR_FALSE;
    PRBool sentFakeSid = PR_FALSE;
    PRBool sentRealSid = sid && sid->version < SSL_LIBRARY_VERSION_TLS_1_3;

    /* If attempting to resume a TLS 1.2 connection, the session ID won't be a
     * fake. Check for the real value. */
    if (sentRealSid) {
        sidMatch = (sidBytes->len == sid->u.ssl3.sessionIDLength) &&
                   (!sidBytes->len || PORT_Memcmp(sid->u.ssl3.sessionID, sidBytes->data, sidBytes->len) == 0);
    } else {
        /* Otherwise, the session ID was a fake if TLS 1.3 compat mode is
         * enabled.  If so, check for the fake value. */
        sentFakeSid = ss->opt.enableTls13CompatMode && !IS_DTLS(ss);
        if (sentFakeSid && sidBytes->len == SSL3_SESSIONID_BYTES) {
            PRUint8 buf[SSL3_SESSIONID_BYTES];
            ssl_MakeFakeSid(ss, buf);
            sidMatch = PORT_Memcmp(buf, sidBytes->data, sidBytes->len) == 0;
        }
    }

    /* TLS 1.2: Session ID shouldn't match if we sent a fake. */
    if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
        if (sentFakeSid) {
            return !sidMatch;
        }
        return PR_TRUE;
    }

    /* TLS 1.3: We sent a session ID.  The server's should match. */
    if (!IS_DTLS(ss) && (sentRealSid || sentFakeSid)) {
        return sidMatch;
    }

    /* TLS 1.3 (no SID)/DTLS 1.3: The server shouldn't send a session ID. */
    return sidBytes->len == 0;
}

static SECStatus
ssl_CheckServerRandom(sslSocket *ss)
{
    /* Check the ServerHello.random per [RFC 8446 Section 4.1.3].
     *
     * TLS 1.3 clients receiving a ServerHello indicating TLS 1.2 or below
     * MUST check that the last 8 bytes are not equal to either of these
     * values.  TLS 1.2 clients SHOULD also check that the last 8 bytes are
     * not equal to the second value if the ServerHello indicates TLS 1.1 or
     * below.  If a match is found, the client MUST abort the handshake with
     * an "illegal_parameter" alert.
     */
    SSL3ProtocolVersion checkVersion =
        ss->ssl3.downgradeCheckVersion ? ss->ssl3.downgradeCheckVersion
                                       : ss->vrange.max;

    if (checkVersion >= SSL_LIBRARY_VERSION_TLS_1_2 &&
        checkVersion > ss->version) {
        /* Both sections use the same sentinel region. */
        PRUint8 *downgrade_sentinel =
            ss->ssl3.hs.server_random +
            SSL3_RANDOM_LENGTH - sizeof(tls12_downgrade_random);

        if (!PORT_Memcmp(downgrade_sentinel,
                         tls12_downgrade_random,
                         sizeof(tls12_downgrade_random)) ||
            !PORT_Memcmp(downgrade_sentinel,
                         tls1_downgrade_random,
                         sizeof(tls1_downgrade_random))) {
            return SECFailure;
        }
    }

    return SECSuccess;
}

/* Called from ssl3_HandleHandshakeMessage() when it has deciphered a complete
 * ssl3 ServerHello message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleServerHello(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    PRUint32 cipher;
    int errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
    PRUint32 compression;
    SECStatus rv;
    SECItem sidBytes = { siBuffer, NULL, 0 };
    PRBool isHelloRetry;
    SSL3AlertDescription desc = illegal_parameter;
    const PRUint8 *savedMsg = b;
    const PRUint32 savedLength = length;

    SSL_TRC(3, ("%d: SSL3[%d]: handle server_hello handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->ssl3.hs.ws != wait_server_hello) {
        errCode = SSL_ERROR_RX_UNEXPECTED_SERVER_HELLO;
        desc = unexpected_message;
        goto alert_loser;
    }

    /* clean up anything left from previous handshake. */
    if (ss->ssl3.clientCertChain != NULL) {
        CERT_DestroyCertificateList(ss->ssl3.clientCertChain);
        ss->ssl3.clientCertChain = NULL;
    }
    if (ss->ssl3.clientCertificate != NULL) {
        CERT_DestroyCertificate(ss->ssl3.clientCertificate);
        ss->ssl3.clientCertificate = NULL;
    }
    if (ss->ssl3.clientPrivateKey != NULL) {
        SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey);
        ss->ssl3.clientPrivateKey = NULL;
    }
    // TODO(djackson) - Bob removed this. Why?
    if (ss->ssl3.hs.clientAuthSignatureSchemes != NULL) {
        PR_Free(ss->ssl3.hs.clientAuthSignatureSchemes);
        ss->ssl3.hs.clientAuthSignatureSchemes = NULL;
        ss->ssl3.hs.clientAuthSignatureSchemesLen = 0;
    }

    /* Note that if the server selects TLS 1.3, this will set the version to TLS
     * 1.2.  We will amend that once all other fields have been read. */
    rv = ssl_ClientReadVersion(ss, &b, &length, &ss->version);
    if (rv != SECSuccess) {
        goto loser; /* alert has been sent */
    }

    rv = ssl3_ConsumeHandshake(
        ss, ss->ssl3.hs.server_random, SSL3_RANDOM_LENGTH, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* alert has been sent */
    }
    isHelloRetry = !PORT_Memcmp(ss->ssl3.hs.server_random,
                                ssl_hello_retry_random, SSL3_RANDOM_LENGTH);

    rv = ssl3_ConsumeHandshakeVariable(ss, &sidBytes, 1, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* alert has been sent */
    }
    if (sidBytes.len > SSL3_SESSIONID_BYTES) {
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_0)
            desc = decode_error;
        goto alert_loser; /* malformed. */
    }

    /* Read the cipher suite. */
    rv = ssl3_ConsumeHandshakeNumber(ss, &cipher, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* alert has been sent */
    }

    /* Compression method. */
    rv = ssl3_ConsumeHandshakeNumber(ss, &compression, 1, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* alert has been sent */
    }
    if (compression != ssl_compression_null) {
        desc = illegal_parameter;
        errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
        goto alert_loser;
    }

    /* Parse extensions. */
    if (length != 0) {
        PRUint32 extensionLength;
        rv = ssl3_ConsumeHandshakeNumber(ss, &extensionLength, 2, &b, &length);
        if (rv != SECSuccess) {
            goto loser; /* alert already sent */
        }
        if (extensionLength != length) {
            desc = decode_error;
            goto alert_loser;
        }
        rv = ssl3_ParseExtensions(ss, &b, &length);
        if (rv != SECSuccess) {
            goto alert_loser; /* malformed */
        }
    }

    /* Read supported_versions if present. */
    rv = tls13_ClientReadSupportedVersion(ss);
    if (rv != SECSuccess) {
        goto loser;
    }

    PORT_Assert(!SSL_ALL_VERSIONS_DISABLED(&ss->vrange));
    /* Check that the version is within the configured range. */
    if (ss->vrange.min > ss->version || ss->vrange.max < ss->version) {
        desc = (ss->version > SSL_LIBRARY_VERSION_3_0)
                   ? protocol_version
                   : handshake_failure;
        errCode = SSL_ERROR_UNSUPPORTED_VERSION;
        goto alert_loser;
    }

    if (isHelloRetry && ss->ssl3.hs.helloRetry) {
        SSL_TRC(3, ("%d: SSL3[%d]: received a second hello_retry_request",
                    SSL_GETPID(), ss->fd));
        desc = unexpected_message;
        errCode = SSL_ERROR_RX_UNEXPECTED_HELLO_RETRY_REQUEST;
        goto alert_loser;
    }

    /* There are three situations in which the server must pick
     * TLS 1.3.
     *
     * 1. We received HRR
     * 2. We sent early app data
     * 3. ECH was accepted (checked in MaybeHandleEchSignal)
     *
     * If we offered ECH and the server negotiated a lower version,
     * authenticate to the public name for secure disablement.
     *
     */
    if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
        if (isHelloRetry || ss->ssl3.hs.helloRetry) {
            /* SSL3_SendAlert() will uncache the SID. */
            desc = illegal_parameter;
            errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
            goto alert_loser;
        }
        if (ss->ssl3.hs.zeroRttState == ssl_0rtt_sent) {
            /* SSL3_SendAlert() will uncache the SID. */
            desc = illegal_parameter;
            errCode = SSL_ERROR_DOWNGRADE_WITH_EARLY_DATA;
            goto alert_loser;
        }
    }

    /* Check that the server negotiated the same version as it did
     * in the first handshake. This isn't really the best place for
     * us to be getting this version number, but it's what we have.
     * (1294697). */
    if (ss->firstHsDone && (ss->version != ss->ssl3.crSpec->version)) {
        desc = protocol_version;
        errCode = SSL_ERROR_UNSUPPORTED_VERSION;
        goto alert_loser;
    }

    if (ss->opt.enableHelloDowngradeCheck
#ifdef DTLS_1_3_DRAFT_VERSION
        /* Disable this check while we are on draft DTLS 1.3 versions. */
        && !IS_DTLS(ss)
#endif
    ) {
        rv = ssl_CheckServerRandom(ss);
        if (rv != SECSuccess) {
            desc = illegal_parameter;
            errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
            goto alert_loser;
        }
    }

    /* Finally, now all the version-related checks have passed. */
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_version;
    /* Update the write cipher spec to match the version. But not after
     * HelloRetryRequest, because cwSpec might be a 0-RTT cipher spec,
     * in which case this is a no-op. */
    if (!ss->firstHsDone && !isHelloRetry) {
        ssl_GetSpecWriteLock(ss);
        ssl_SetSpecVersions(ss, ss->ssl3.cwSpec);
        ssl_ReleaseSpecWriteLock(ss);
    }

    /* Check that the session ID is as expected. */
    if (!ssl_CheckServerSessionIdCorrectness(ss, &sidBytes)) {
        desc = illegal_parameter;
        errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
        goto alert_loser;
    }

    /* Only initialize hashes if this isn't a Hello Retry. */
    rv = ssl_ClientSetCipherSuite(ss, ss->version, cipher,
                                  !isHelloRetry);
    if (rv != SECSuccess) {
        desc = illegal_parameter;
        errCode = PORT_GetError();
        goto alert_loser;
    }

    dtls_ReceivedFirstMessageInFlight(ss);

    if (isHelloRetry) {
        rv = tls13_HandleHelloRetryRequest(ss, savedMsg, savedLength);
        if (rv != SECSuccess) {
            goto loser;
        }
        return SECSuccess;
    }

    rv = ssl3_HandleParsedExtensions(ss, ssl_hs_server_hello);
    ssl3_DestroyRemoteExtensions(&ss->ssl3.hs.remoteExtensions);
    if (rv != SECSuccess) {
        goto alert_loser;
    }

    rv = ssl_HashHandshakeMessage(ss, ssl_hs_server_hello,
                                  savedMsg, savedLength);
    if (rv != SECSuccess) {
        goto loser;
    }

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        rv = tls13_HandleServerHelloPart2(ss, savedMsg, savedLength);
        if (rv != SECSuccess) {
            errCode = PORT_GetError();
            goto loser;
        }
    } else {
        rv = ssl3_HandleServerHelloPart2(ss, &sidBytes, &errCode);
        if (rv != SECSuccess)
            goto loser;
    }

    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_ech;
    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);

loser:
    /* Clean up the temporary pointer to the handshake buffer. */
    ss->xtnData.signedCertTimestamps.len = 0;
    ssl_MapLowLevelError(errCode);
    return SECFailure;
}

static SECStatus
ssl3_UnwrapMasterSecretClient(sslSocket *ss, sslSessionID *sid, PK11SymKey **ms)
{
    PK11SlotInfo *slot;
    PK11SymKey *wrapKey;
    CK_FLAGS keyFlags = 0;
    SECItem wrappedMS = {
        siBuffer,
        sid->u.ssl3.keys.wrapped_master_secret,
        sid->u.ssl3.keys.wrapped_master_secret_len
    };

    /* unwrap master secret */
    slot = SECMOD_LookupSlot(sid->u.ssl3.masterModuleID,
                             sid->u.ssl3.masterSlotID);
    if (slot == NULL) {
        return SECFailure;
    }
    if (!PK11_IsPresent(slot)) {
        PK11_FreeSlot(slot);
        return SECFailure;
    }
    wrapKey = PK11_GetWrapKey(slot, sid->u.ssl3.masterWrapIndex,
                              sid->u.ssl3.masterWrapMech,
                              sid->u.ssl3.masterWrapSeries,
                              ss->pkcs11PinArg);
    PK11_FreeSlot(slot);
    if (wrapKey == NULL) {
        return SECFailure;
    }

    if (ss->version > SSL_LIBRARY_VERSION_3_0) { /* isTLS */
        keyFlags = CKF_SIGN | CKF_VERIFY;
    }

    *ms = PK11_UnwrapSymKeyWithFlags(wrapKey, sid->u.ssl3.masterWrapMech,
                                     NULL, &wrappedMS, CKM_SSL3_MASTER_KEY_DERIVE,
                                     CKA_DERIVE, SSL3_MASTER_SECRET_LENGTH, keyFlags);
    PK11_FreeSymKey(wrapKey);
    if (!*ms) {
        return SECFailure;
    }
    return SECSuccess;
}

static SECStatus
ssl3_HandleServerHelloPart2(sslSocket *ss, const SECItem *sidBytes,
                            int *retErrCode)
{
    SSL3AlertDescription desc = handshake_failure;
    int errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
    SECStatus rv;
    PRBool sid_match;
    sslSessionID *sid = ss->sec.ci.sid;

    if ((ss->opt.requireSafeNegotiation ||
         (ss->firstHsDone && (ss->peerRequestedProtection ||
                              ss->opt.enableRenegotiation ==
                                  SSL_RENEGOTIATE_REQUIRES_XTN))) &&
        !ssl3_ExtensionNegotiated(ss, ssl_renegotiation_info_xtn)) {
        desc = handshake_failure;
        errCode = ss->firstHsDone ? SSL_ERROR_RENEGOTIATION_NOT_ALLOWED
                                  : SSL_ERROR_UNSAFE_NEGOTIATION;
        goto alert_loser;
    }

    /* Any errors after this point are not "malformed" errors. */
    desc = handshake_failure;

    /* we need to call ssl3_SetupPendingCipherSpec here so we can check the
     * key exchange algorithm. */
    rv = ssl3_SetupBothPendingCipherSpecs(ss);
    if (rv != SECSuccess) {
        goto alert_loser; /* error code is set. */
    }

    /* We may or may not have sent a session id, we may get one back or
     * not and if so it may match the one we sent.
     * Attempt to restore the master secret to see if this is so...
     * Don't consider failure to find a matching SID an error.
     */
    sid_match = (PRBool)(sidBytes->len > 0 &&
                         sidBytes->len ==
                             sid->u.ssl3.sessionIDLength &&
                         !PORT_Memcmp(sid->u.ssl3.sessionID,
                                      sidBytes->data, sidBytes->len));

    if (sid_match) {
        if (sid->version != ss->version ||
            sid->u.ssl3.cipherSuite != ss->ssl3.hs.cipher_suite) {
            errCode = SSL_ERROR_RX_MALFORMED_SERVER_HELLO;
            goto alert_loser;
        }
        do {
            PK11SymKey *masterSecret;

            /* [draft-ietf-tls-session-hash-06; Section 5.3]
             *
             * o  If the original session did not use the "extended_master_secret"
             *    extension but the new ServerHello contains the extension, the
             *    client MUST abort the handshake.
             */
            if (!sid->u.ssl3.keys.extendedMasterSecretUsed &&
                ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn)) {
                errCode = SSL_ERROR_UNEXPECTED_EXTENDED_MASTER_SECRET;
                goto alert_loser;
            }

            /*
             *   o  If the original session used an extended master secret but the new
             *      ServerHello does not contain the "extended_master_secret"
             *      extension, the client SHOULD abort the handshake.
             *
             * TODO(ekr@rtfm.com): Add option to refuse to resume when EMS is not
             * used at all (bug 1176526).
             */
            if (sid->u.ssl3.keys.extendedMasterSecretUsed &&
                !ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn)) {
                errCode = SSL_ERROR_MISSING_EXTENDED_MASTER_SECRET;
                goto alert_loser;
            }

            ss->sec.authType = sid->authType;
            ss->sec.authKeyBits = sid->authKeyBits;
            ss->sec.keaType = sid->keaType;
            ss->sec.keaKeyBits = sid->keaKeyBits;
            ss->sec.originalKeaGroup = ssl_LookupNamedGroup(sid->keaGroup);
            ss->sec.signatureScheme = sid->sigScheme;

            rv = ssl3_UnwrapMasterSecretClient(ss, sid, &masterSecret);
            if (rv != SECSuccess) {
                break; /* not considered an error */
            }

            /* Got a Match */
            SSL_AtomicIncrementLong(&ssl3stats.hsh_sid_cache_hits);

            /* If we sent a session ticket, then this is a stateless resume. */
            if (ss->xtnData.sentSessionTicketInClientHello)
                SSL_AtomicIncrementLong(&ssl3stats.hsh_sid_stateless_resumes);

            if (ssl3_ExtensionNegotiated(ss, ssl_session_ticket_xtn))
                ss->ssl3.hs.ws = wait_new_session_ticket;
            else
                ss->ssl3.hs.ws = wait_change_cipher;

            ss->ssl3.hs.isResuming = PR_TRUE;

            /* copy the peer cert from the SID */
            if (sid->peerCert != NULL) {
                ss->sec.peerCert = CERT_DupCertificate(sid->peerCert);
            }

            /* We are re-using the old MS, so no need to derive again. */
            rv = ssl3_InitPendingCipherSpecs(ss, masterSecret, PR_FALSE);
            if (rv != SECSuccess) {
                goto alert_loser; /* err code was set */
            }
            return SECSuccess;
        } while (0);
    }

    if (sid_match)
        SSL_AtomicIncrementLong(&ssl3stats.hsh_sid_cache_not_ok);
    else
        SSL_AtomicIncrementLong(&ssl3stats.hsh_sid_cache_misses);

    /* We tried to resume a 1.3 session but the server negotiated 1.2. */
    if (ss->statelessResume) {
        PORT_Assert(sid->version == SSL_LIBRARY_VERSION_TLS_1_3);
        PORT_Assert(ss->ssl3.hs.currentSecret);

        /* Reset resumption state, only used by 1.3 code. */
        ss->statelessResume = PR_FALSE;

        /* Clear TLS 1.3 early data traffic key. */
        PK11_FreeSymKey(ss->ssl3.hs.currentSecret);
        ss->ssl3.hs.currentSecret = NULL;
    }

    /* throw the old one away */
    sid->u.ssl3.keys.resumable = PR_FALSE;
    ssl_UncacheSessionID(ss);
    ssl_FreeSID(sid);

    /* get a new sid */
    ss->sec.ci.sid = sid = ssl3_NewSessionID(ss, PR_FALSE);
    if (sid == NULL) {
        goto alert_loser; /* memory error is set. */
    }

    sid->version = ss->version;
    sid->u.ssl3.sessionIDLength = sidBytes->len;
    if (sidBytes->len > 0) {
        PORT_Memcpy(sid->u.ssl3.sessionID, sidBytes->data, sidBytes->len);
    }

    sid->u.ssl3.keys.extendedMasterSecretUsed =
        ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn);

    /* Copy Signed Certificate Timestamps, if any. */
    if (ss->xtnData.signedCertTimestamps.len) {
        rv = SECITEM_CopyItem(NULL, &sid->u.ssl3.signedCertTimestamps,
                              &ss->xtnData.signedCertTimestamps);
        ss->xtnData.signedCertTimestamps.len = 0;
        if (rv != SECSuccess)
            goto loser;
    }

    ss->ssl3.hs.isResuming = PR_FALSE;
    if (ss->ssl3.hs.kea_def->authKeyType != ssl_auth_null) {
        /* All current cipher suites other than those with ssl_auth_null (i.e.,
         * (EC)DH_anon_* suites) require a certificate, so use that signal. */
        ss->ssl3.hs.ws = wait_server_cert;
    } else {
        /* All the remaining cipher suites must be (EC)DH_anon_* and so
         * must be ephemeral. Note, if we ever add PSK this might
         * change. */
        PORT_Assert(ss->ssl3.hs.kea_def->ephemeral);
        ss->ssl3.hs.ws = wait_server_key;
    }
    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);

loser:
    *retErrCode = errCode;
    return SECFailure;
}

static SECStatus
ssl_HandleDHServerKeyExchange(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECStatus rv;
    int errCode = SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH;
    SSL3AlertDescription desc = illegal_parameter;
    SSLHashType hashAlg;
    PRBool isTLS = ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0;
    SSLSignatureScheme sigScheme;

    SECItem dh_p = { siBuffer, NULL, 0 };
    SECItem dh_g = { siBuffer, NULL, 0 };
    SECItem dh_Ys = { siBuffer, NULL, 0 };
    unsigned dh_p_bits;
    unsigned dh_g_bits;
    PRInt32 minDH = 0;
    PRInt32 optval;

    SSL3Hashes hashes;
    SECItem signature = { siBuffer, NULL, 0 };
    PLArenaPool *arena = NULL;
    SECKEYPublicKey *peerKey = NULL;

    rv = ssl3_ConsumeHandshakeVariable(ss, &dh_p, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* malformed. */
    }
    rv = NSS_OptionGet(NSS_KEY_SIZE_POLICY_FLAGS, &optval);
    if ((rv == SECSuccess) && (optval & NSS_KEY_SIZE_POLICY_SSL_FLAG)) {
        (void)NSS_OptionGet(NSS_DH_MIN_KEY_SIZE, &minDH);
    }

    if (minDH <= 0) {
        minDH = SSL_DH_MIN_P_BITS;
    }
    dh_p_bits = SECKEY_BigIntegerBitLength(&dh_p);
    if (dh_p_bits < (unsigned)minDH) {
        errCode = SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY;
        goto alert_loser;
    }
    if (dh_p_bits > SSL_MAX_DH_KEY_BITS) {
        errCode = SSL_ERROR_DH_KEY_TOO_LONG;
        goto alert_loser;
    }
    rv = ssl3_ConsumeHandshakeVariable(ss, &dh_g, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* malformed. */
    }
    /* Abort if dh_g is 0, 1, or obviously too big. */
    dh_g_bits = SECKEY_BigIntegerBitLength(&dh_g);
    if (dh_g_bits > dh_p_bits || dh_g_bits <= 1) {
        goto alert_loser;
    }
    if (ss->opt.requireDHENamedGroups) {
        /* If we're doing named groups, make sure it's good. */
        rv = ssl_ValidateDHENamedGroup(ss, &dh_p, &dh_g, NULL, NULL);
        if (rv != SECSuccess) {
            errCode = SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY;
            goto alert_loser;
        }
    }

    rv = ssl3_ConsumeHandshakeVariable(ss, &dh_Ys, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* malformed. */
    }
    if (!ssl_IsValidDHEShare(&dh_p, &dh_Ys)) {
        errCode = SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE;
        goto alert_loser;
    }

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme);
        if (rv != SECSuccess) {
            goto loser; /* alert already sent */
        }
        rv = ssl_CheckSignatureSchemeConsistency(
            ss, sigScheme, &ss->sec.peerCert->subjectPublicKeyInfo);
        if (rv != SECSuccess) {
            goto alert_loser;
        }
        hashAlg = ssl_SignatureSchemeToHashType(sigScheme);
    } else {
        /* Use ssl_hash_none to represent the MD5+SHA1 combo. */
        hashAlg = ssl_hash_none;
        sigScheme = ssl_sig_none;
    }
    rv = ssl3_ConsumeHandshakeVariable(ss, &signature, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* malformed. */
    }
    if (length != 0) {
        if (isTLS) {
            desc = decode_error;
        }
        goto alert_loser; /* malformed. */
    }

    PRINT_BUF(60, (NULL, "Server DH p", dh_p.data, dh_p.len));
    PRINT_BUF(60, (NULL, "Server DH g", dh_g.data, dh_g.len));
    PRINT_BUF(60, (NULL, "Server DH Ys", dh_Ys.data, dh_Ys.len));

    /* failures after this point are not malformed handshakes. */
    /* TLS: send decrypt_error if signature failed. */
    desc = isTLS ? decrypt_error : handshake_failure;

    /*
     * Check to make sure the hash is signed by right guy.
     */
    rv = ssl3_ComputeDHKeyHash(ss, hashAlg, &hashes,
                               dh_p, dh_g, dh_Ys, PR_FALSE /* padY */);
    if (rv != SECSuccess) {
        errCode =
            ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
        goto alert_loser;
    }
    rv = ssl3_VerifySignedHashes(ss, sigScheme, &hashes, &signature);
    if (rv != SECSuccess) {
        errCode =
            ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
        goto alert_loser;
    }

    /*
     * we really need to build a new key here because we can no longer
     * ignore calling SECKEY_DestroyPublicKey. Using the key may allocate
     * pkcs11 slots and ID's.
     */
    arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
    if (arena == NULL) {
        errCode = SEC_ERROR_NO_MEMORY;
        goto loser;
    }

    peerKey = PORT_ArenaZNew(arena, SECKEYPublicKey);
    if (peerKey == NULL) {
        errCode = SEC_ERROR_NO_MEMORY;
        goto loser;
    }

    peerKey->arena = arena;
    peerKey->keyType = dhKey;
    peerKey->pkcs11Slot = NULL;
    peerKey->pkcs11ID = CK_INVALID_HANDLE;

    if (SECITEM_CopyItem(arena, &peerKey->u.dh.prime, &dh_p) ||
        SECITEM_CopyItem(arena, &peerKey->u.dh.base, &dh_g) ||
        SECITEM_CopyItem(arena, &peerKey->u.dh.publicValue, &dh_Ys)) {
        errCode = SEC_ERROR_NO_MEMORY;
        goto loser;
    }
    ss->sec.peerKey = peerKey;
    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);
loser:
    if (arena) {
        PORT_FreeArena(arena, PR_FALSE);
    }
    PORT_SetError(ssl_MapLowLevelError(errCode));
    return SECFailure;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered a
 * complete ssl3 ServerKeyExchange message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleServerKeyExchange(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: handle server_key_exchange handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->ssl3.hs.ws != wait_server_key) {
        SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_SERVER_KEY_EXCH);
        return SECFailure;
    }

    switch (ss->ssl3.hs.kea_def->exchKeyType) {
        case ssl_kea_dh:
            rv = ssl_HandleDHServerKeyExchange(ss, b, length);
            break;

        case ssl_kea_ecdh:
            rv = ssl3_HandleECDHServerKeyExchange(ss, b, length);
            break;

        default:
            SSL3_SendAlert(ss, alert_fatal, handshake_failure);
            PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG);
            rv = SECFailure;
            break;
    }

    if (rv == SECSuccess) {
        ss->ssl3.hs.ws = wait_cert_request;
    }
    /* All Handle*ServerKeyExchange functions set the error code. */
    return rv;
}

typedef struct dnameNode {
    struct dnameNode *next;
    SECItem name;
} dnameNode;

/*
 * Parse the ca_list structure in a CertificateRequest.
 *
 * Called from:
 * ssl3_HandleCertificateRequest
 * tls13_HandleCertificateRequest
 */
SECStatus
ssl3_ParseCertificateRequestCAs(sslSocket *ss, PRUint8 **b, PRUint32 *length,
                                CERTDistNames *ca_list)
{
    PRUint32 remaining;
    int nnames = 0;
    dnameNode *node;
    SECStatus rv;
    int i;

    rv = ssl3_ConsumeHandshakeNumber(ss, &remaining, 2, b, length);
    if (rv != SECSuccess)
        return SECFailure; /* malformed, alert has been sent */

    if (remaining > *length)
        goto alert_loser;

    ca_list->head = node = PORT_ArenaZNew(ca_list->arena, dnameNode);
    if (node == NULL)
        goto no_mem;

    while (remaining > 0) {
        PRUint32 len;

        if (remaining < 2)
            goto alert_loser; /* malformed */

        rv = ssl3_ConsumeHandshakeNumber(ss, &len, 2, b, length);
        if (rv != SECSuccess)
            return SECFailure; /* malformed, alert has been sent */
        if (len == 0 || remaining < len + 2)
            goto alert_loser; /* malformed */

        remaining -= 2;
        if (SECITEM_MakeItem(ca_list->arena, &node->name, *b, len) != SECSuccess) {
            goto no_mem;
        }
        node->name.len = len;
        *b += len;
        *length -= len;
        remaining -= len;
        nnames++;
        if (remaining <= 0)
            break; /* success */

        node->next = PORT_ArenaZNew(ca_list->arena, dnameNode);
        node = node->next;
        if (node == NULL)
            goto no_mem;
    }

    ca_list->nnames = nnames;
    ca_list->names = PORT_ArenaNewArray(ca_list->arena, SECItem, nnames);
    if (nnames > 0 && ca_list->names == NULL)
        goto no_mem;

    for (i = 0, node = (dnameNode *)ca_list->head;
         i < nnames;
         i++, node = node->next) {
        ca_list->names[i] = node->name;
    }

    return SECSuccess;

no_mem:
    return SECFailure;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal,
                         ss->version < SSL_LIBRARY_VERSION_TLS_1_0 ? illegal_parameter
                                                                   : decode_error);
    PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_REQUEST);
    return SECFailure;
}

SECStatus
ssl_ParseSignatureSchemes(const sslSocket *ss, PLArenaPool *arena,
                          SSLSignatureScheme **schemesOut,
                          unsigned int *numSchemesOut,
                          unsigned char **b, unsigned int *len)
{
    SECStatus rv;
    SECItem buf;
    SSLSignatureScheme *schemes = NULL;
    unsigned int numSupported = 0;
    unsigned int numRemaining = 0;
    unsigned int max;

    rv = ssl3_ExtConsumeHandshakeVariable(ss, &buf, 2, b, len);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    /* An odd-length value is invalid. */
    if ((buf.len & 1) != 0) {
        ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
        return SECFailure;
    }

    /* Let the caller decide whether to alert here. */
    if (buf.len == 0) {
        goto done;
    }

    /* Limit the number of schemes we read. */
    numRemaining = buf.len / 2;
    max = PR_MIN(numRemaining, MAX_SIGNATURE_SCHEMES);

    if (arena) {
        schemes = PORT_ArenaZNewArray(arena, SSLSignatureScheme, max);
    } else {
        schemes = PORT_ZNewArray(SSLSignatureScheme, max);
    }
    if (!schemes) {
        ssl3_ExtSendAlert(ss, alert_fatal, internal_error);
        return SECFailure;
    }

    for (; numRemaining && numSupported < MAX_SIGNATURE_SCHEMES; --numRemaining) {
        PRUint32 tmp;
        rv = ssl3_ExtConsumeHandshakeNumber(ss, &tmp, 2, &buf.data, &buf.len);
        if (rv != SECSuccess) {
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }
        if (ssl_SignatureSchemeValid((SSLSignatureScheme)tmp, SEC_OID_UNKNOWN,
                                     (PRBool)ss->version >= SSL_LIBRARY_VERSION_TLS_1_3)) {
            ;
            schemes[numSupported++] = (SSLSignatureScheme)tmp;
        }
    }

    if (!numSupported) {
        if (!arena) {
            PORT_Free(schemes);
        }
        schemes = NULL;
    }

done:
    *schemesOut = schemes;
    *numSchemesOut = numSupported;
    return SECSuccess;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 Certificate Request message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    PLArenaPool *arena = NULL;
    PRBool isTLS = PR_FALSE;
    PRBool isTLS12 = PR_FALSE;
    int errCode = SSL_ERROR_RX_MALFORMED_CERT_REQUEST;
    SECStatus rv;
    SSL3AlertDescription desc = illegal_parameter;
    SECItem cert_types = { siBuffer, NULL, 0 };
    SSLSignatureScheme *signatureSchemes = NULL;
    unsigned int signatureSchemeCount = 0;
    CERTDistNames ca_list;

    SSL_TRC(3, ("%d: SSL3[%d]: handle certificate_request handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->ssl3.hs.ws != wait_cert_request) {
        desc = unexpected_message;
        errCode = SSL_ERROR_RX_UNEXPECTED_CERT_REQUEST;
        goto alert_loser;
    }

    PORT_Assert(ss->ssl3.clientCertChain == NULL);
    PORT_Assert(ss->ssl3.clientCertificate == NULL);
    PORT_Assert(ss->ssl3.clientPrivateKey == NULL);

    isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
    isTLS12 = (PRBool)(ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
    rv = ssl3_ConsumeHandshakeVariable(ss, &cert_types, 1, &b, &length);
    if (rv != SECSuccess)
        goto loser; /* malformed, alert has been sent */

    arena = ca_list.arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
    if (arena == NULL)
        goto no_mem;

    if (isTLS12) {
        rv = ssl_ParseSignatureSchemes(ss, arena,
                                       &signatureSchemes,
                                       &signatureSchemeCount,
                                       &b, &length);
        if (rv != SECSuccess) {
            PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_REQUEST);
            goto loser; /* malformed, alert has been sent */
        }
        if (signatureSchemeCount == 0) {
            errCode = SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM;
            desc = handshake_failure;
            goto alert_loser;
        }
    }

    rv = ssl3_ParseCertificateRequestCAs(ss, &b, &length, &ca_list);
    if (rv != SECSuccess)
        goto done; /* alert sent in ssl3_ParseCertificateRequestCAs */

    if (length != 0)
        goto alert_loser; /* malformed */

    ss->ssl3.hs.ws = wait_hello_done;

    rv = ssl3_BeginHandleCertificateRequest(ss, signatureSchemes,
                                            signatureSchemeCount, &ca_list);
    if (rv != SECSuccess) {
        PORT_Assert(0);
        errCode = SEC_ERROR_LIBRARY_FAILURE;
        desc = internal_error;
        goto alert_loser;
    }
    goto done;

no_mem:
    rv = SECFailure;
    PORT_SetError(SEC_ERROR_NO_MEMORY);
    goto done;

alert_loser:
    if (isTLS && desc == illegal_parameter)
        desc = decode_error;
    (void)SSL3_SendAlert(ss, alert_fatal, desc);
loser:
    PORT_SetError(errCode);
    rv = SECFailure;
done:
    if (arena != NULL)
        PORT_FreeArena(arena, PR_FALSE);
    return rv;
}

static void
ssl3_ClientAuthCallbackOutcome(sslSocket *ss, SECStatus outcome)
{
    SECStatus rv;
    switch (outcome) {
        case SECSuccess:
            /* check what the callback function returned */
            if ((!ss->ssl3.clientCertificate) || (!ss->ssl3.clientPrivateKey)) {
                /* we are missing either the key or cert */
                goto send_no_certificate;
            }
            /* Setting ssl3.clientCertChain non-NULL will cause
             * ssl3_HandleServerHelloDone to call SendCertificate.
             */
            ss->ssl3.clientCertChain = CERT_CertChainFromCert(
                ss->ssl3.clientCertificate,
                certUsageSSLClient, PR_FALSE);
            if (ss->ssl3.clientCertChain == NULL) {
                goto send_no_certificate;
            }
            if (ss->ssl3.hs.hashType == handshake_hash_record ||
                ss->ssl3.hs.hashType == handshake_hash_single) {
                rv = ssl_PickClientSignatureScheme(ss,
                                                   ss->ssl3.clientCertificate,
                                                   ss->ssl3.clientPrivateKey,
                                                   ss->ssl3.hs.clientAuthSignatureSchemes,
                                                   ss->ssl3.hs.clientAuthSignatureSchemesLen,
                                                   &ss->ssl3.hs.signatureScheme);
                if (rv != SECSuccess) {
                    /* This should only happen if our schemes changed or
                     * if an RSA-PSS cert was selected, but the token
                     * does not support PSS schemes.
                     */
                    goto send_no_certificate;
                }
            }
            break;

        case SECFailure:
        default:
        send_no_certificate:
            CERT_DestroyCertificate(ss->ssl3.clientCertificate);
            SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey);
            ss->ssl3.clientCertificate = NULL;
            ss->ssl3.clientPrivateKey = NULL;
            if (ss->ssl3.clientCertChain) {
                CERT_DestroyCertificateList(ss->ssl3.clientCertChain);
                ss->ssl3.clientCertChain = NULL;
            }

            if (ss->version > SSL_LIBRARY_VERSION_3_0) {
                ss->ssl3.sendEmptyCert = PR_TRUE;
            } else {
                (void)SSL3_SendAlert(ss, alert_warning, no_certificate);
            }
            break;
    }

    /* Release the cached parameters */
    PORT_Free(ss->ssl3.hs.clientAuthSignatureSchemes);
    ss->ssl3.hs.clientAuthSignatureSchemes = NULL;
    ss->ssl3.hs.clientAuthSignatureSchemesLen = 0;
}

SECStatus
ssl3_BeginHandleCertificateRequest(sslSocket *ss,
                                   const SSLSignatureScheme *signatureSchemes,
                                   unsigned int signatureSchemeCount,
                                   CERTDistNames *ca_list)
{
    SECStatus rv;

    PR_ASSERT(!ss->ssl3.hs.clientCertificatePending);

    /* Should not send a client cert when (non-GREASE) ECH is rejected. */
    if (ss->ssl3.hs.echHpkeCtx && !ss->ssl3.hs.echAccepted) {
        PORT_Assert(ssl3_ExtensionAdvertised(ss, ssl_tls13_encrypted_client_hello_xtn));
        rv = SECFailure;
    } else if (ss->getClientAuthData != NULL) {
        PORT_Assert((ss->ssl3.hs.preliminaryInfo & ssl_preinfo_all) ==
                    ssl_preinfo_all);
        PORT_Assert(ss->ssl3.clientPrivateKey == NULL);
        PORT_Assert(ss->ssl3.clientCertificate == NULL);
        PORT_Assert(ss->ssl3.clientCertChain == NULL);

        /* Previously cached parameters should be empty */
        PORT_Assert(ss->ssl3.hs.clientAuthSignatureSchemes == NULL);
        PORT_Assert(ss->ssl3.hs.clientAuthSignatureSchemesLen == 0);
        /*
         * Peer signatures are only available while in the context of
         * of a getClientAuthData callback. It is required for proper
         * functioning of SSL_CertIsUsable and SSL_FilterClientCertListBySocket
         * Calling these functions outside the context of a getClientAuthData
         * callback will result in no filtering.*/

        ss->ssl3.hs.clientAuthSignatureSchemes = PORT_ZNewArray(SSLSignatureScheme, signatureSchemeCount);
        PORT_Memcpy(ss->ssl3.hs.clientAuthSignatureSchemes, signatureSchemes, signatureSchemeCount * sizeof(SSLSignatureScheme));
        ss->ssl3.hs.clientAuthSignatureSchemesLen = signatureSchemeCount;

        rv = (SECStatus)(*ss->getClientAuthData)(ss->getClientAuthDataArg,
                                                 ss->fd, ca_list,
                                                 &ss->ssl3.clientCertificate,
                                                 &ss->ssl3.clientPrivateKey);
    } else {
        rv = SECFailure; /* force it to send a no_certificate alert */
    }

    if (rv == SECWouldBlock) {
        /* getClientAuthData needs more time (e.g. for user interaction) */

        /* The out parameters should not have changed. */
        PORT_Assert(ss->ssl3.clientCertificate == NULL);
        PORT_Assert(ss->ssl3.clientPrivateKey == NULL);

        /* Mark the handshake as blocked */
        ss->ssl3.hs.clientCertificatePending = PR_TRUE;

        rv = SECSuccess;
    } else {
        /* getClientAuthData returned SECSuccess or SECFailure immediately, handle accordingly */
        ssl3_ClientAuthCallbackOutcome(ss, rv);
        rv = SECSuccess;
    }
    return rv;
}

/* Invoked by the application when client certificate selection is complete */
SECStatus
ssl3_ClientCertCallbackComplete(sslSocket *ss, SECStatus outcome, SECKEYPrivateKey *clientPrivateKey, CERTCertificate *clientCertificate)
{
    PORT_Assert(ss->ssl3.hs.clientCertificatePending);
    ss->ssl3.hs.clientCertificatePending = PR_FALSE;

    ss->ssl3.clientCertificate = clientCertificate;
    ss->ssl3.clientPrivateKey = clientPrivateKey;

    ssl3_ClientAuthCallbackOutcome(ss, outcome);

    /* Continue the handshake */
    PORT_Assert(ss->ssl3.hs.restartTarget);
    if (!ss->ssl3.hs.restartTarget) {
        FATAL_ERROR(ss, PR_INVALID_STATE_ERROR, internal_error);
        return SECFailure;
    }
    sslRestartTarget target = ss->ssl3.hs.restartTarget;
    ss->ssl3.hs.restartTarget = NULL;
    return target(ss);
}

static SECStatus
ssl3_CheckFalseStart(sslSocket *ss)
{
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(!ss->ssl3.hs.authCertificatePending);
    PORT_Assert(!ss->ssl3.hs.canFalseStart);

    if (!ss->canFalseStartCallback) {
        SSL_TRC(3, ("%d: SSL[%d]: no false start callback so no false start",
                    SSL_GETPID(), ss->fd));
    } else {
        SECStatus rv;

        rv = ssl_CheckServerRandom(ss);
        if (rv != SECSuccess) {
            SSL_TRC(3, ("%d: SSL[%d]: no false start due to possible downgrade",
                        SSL_GETPID(), ss->fd));
            goto no_false_start;
        }

        /* An attacker can control the selected ciphersuite so we only wish to
         * do False Start in the case that the selected ciphersuite is
         * sufficiently strong that the attack can gain no advantage.
         * Therefore we always require an 80-bit cipher. */
        ssl_GetSpecReadLock(ss);
        PRBool weakCipher = ss->ssl3.cwSpec->cipherDef->secret_key_size < 10;
        ssl_ReleaseSpecReadLock(ss);
        if (weakCipher) {
            SSL_TRC(3, ("%d: SSL[%d]: no false start due to weak cipher",
                        SSL_GETPID(), ss->fd));
            goto no_false_start;
        }

        if (ssl3_ExtensionAdvertised(ss, ssl_tls13_encrypted_client_hello_xtn)) {
            SSL_TRC(3, ("%d: SSL[%d]: no false start due to lower version after ECH",
                        SSL_GETPID(), ss->fd));
            goto no_false_start;
        }

        PORT_Assert((ss->ssl3.hs.preliminaryInfo & ssl_preinfo_all) ==
                    ssl_preinfo_all);
        rv = (ss->canFalseStartCallback)(ss->fd,
                                         ss->canFalseStartCallbackData,
                                         &ss->ssl3.hs.canFalseStart);
        if (rv == SECSuccess) {
            SSL_TRC(3, ("%d: SSL[%d]: false start callback returned %s",
                        SSL_GETPID(), ss->fd,
                        ss->ssl3.hs.canFalseStart ? "TRUE"
                                                  : "FALSE"));
        } else {
            SSL_TRC(3, ("%d: SSL[%d]: false start callback failed (%s)",
                        SSL_GETPID(), ss->fd,
                        PR_ErrorToName(PR_GetError())));
        }
        return rv;
    }

no_false_start:
    ss->ssl3.hs.canFalseStart = PR_FALSE;
    return SECSuccess;
}

PRBool
ssl3_WaitingForServerSecondRound(sslSocket *ss)
{
    PRBool result;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    switch (ss->ssl3.hs.ws) {
        case wait_new_session_ticket:
        case wait_change_cipher:
        case wait_finished:
            result = PR_TRUE;
            break;
        default:
            result = PR_FALSE;
            break;
    }

    return result;
}

static SECStatus ssl3_SendClientSecondRound(sslSocket *ss);

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 Server Hello Done message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleServerHelloDone(sslSocket *ss)
{
    SECStatus rv;
    SSL3WaitState ws = ss->ssl3.hs.ws;

    SSL_TRC(3, ("%d: SSL3[%d]: handle server_hello_done handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    /* Skipping CertificateRequest is always permitted. */
    if (ws != wait_hello_done &&
        ws != wait_cert_request) {
        SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
        return SECFailure;
    }

    rv = ssl3_SendClientSecondRound(ss);

    return rv;
}

/* Called from ssl3_HandleServerHelloDone and ssl3_AuthCertificateComplete.
 *
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_SendClientSecondRound(sslSocket *ss)
{
    SECStatus rv;
    PRBool sendClientCert;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    sendClientCert = !ss->ssl3.sendEmptyCert &&
                     ss->ssl3.clientCertChain != NULL &&
                     ss->ssl3.clientPrivateKey != NULL;

    /* We must wait for the server's certificate to be authenticated before
     * sending the client certificate in order to disclosing the client
     * certificate to an attacker that does not have a valid cert for the
     * domain we are connecting to.
     *
     * During the initial handshake on a connection, we never send/receive
     * application data until we have authenticated the server's certificate;
     * i.e. we have fully authenticated the handshake before using the cipher
     * specs agreed upon for that handshake. During a renegotiation, we may
     * continue sending and receiving application data during the handshake
     * interleaved with the handshake records. If we were to send the client's
     * second round for a renegotiation before the server's certificate was
     * authenticated, then the application data sent/received after this point
     * would be using cipher spec that hadn't been authenticated. By waiting
     * until the server's certificate has been authenticated during
     * renegotiations, we ensure that renegotiations have the same property
     * as initial handshakes; i.e. we have fully authenticated the handshake
     * before using the cipher specs agreed upon for that handshake for
     * application data.
     */
    if (ss->ssl3.hs.restartTarget) {
        PR_NOT_REACHED("unexpected ss->ssl3.hs.restartTarget");
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }
    /* Check whether waiting for client certificate selection OR
       waiting on server certificate verification AND
       going to send client cert */
    if ((ss->ssl3.hs.clientCertificatePending) ||
        (ss->ssl3.hs.authCertificatePending && (sendClientCert || ss->ssl3.sendEmptyCert || ss->firstHsDone))) {
        SSL_TRC(3, ("%d: SSL3[%p]: deferring ssl3_SendClientSecondRound because"
                    " certificate authentication is still pending.",
                    SSL_GETPID(), ss->fd));
        ss->ssl3.hs.restartTarget = ssl3_SendClientSecondRound;
        PORT_SetError(PR_WOULD_BLOCK_ERROR);
        return SECFailure;
    }

    ssl_GetXmitBufLock(ss); /*******************************/

    if (ss->ssl3.sendEmptyCert) {
        ss->ssl3.sendEmptyCert = PR_FALSE;
        rv = ssl3_SendEmptyCertificate(ss);
        /* Don't send verify */
        if (rv != SECSuccess) {
            goto loser; /* error code is set. */
        }
    } else if (sendClientCert) {
        rv = ssl3_SendCertificate(ss);
        if (rv != SECSuccess) {
            goto loser; /* error code is set. */
        }
    }

    rv = ssl3_SendClientKeyExchange(ss);
    if (rv != SECSuccess) {
        goto loser; /* err is set. */
    }

    if (sendClientCert) {
        rv = ssl3_SendCertificateVerify(ss, ss->ssl3.clientPrivateKey);
        SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey);
        ss->ssl3.clientPrivateKey = NULL;
        if (rv != SECSuccess) {
            goto loser; /* err is set. */
        }
    }

    rv = ssl3_SendChangeCipherSpecs(ss);
    if (rv != SECSuccess) {
        goto loser; /* err code was set. */
    }

    /* This must be done after we've set ss->ssl3.cwSpec in
     * ssl3_SendChangeCipherSpecs because SSL_GetChannelInfo uses information
     * from cwSpec. This must be done before we call ssl3_CheckFalseStart
     * because the false start callback (if any) may need the information from
     * the functions that depend on this being set.
     */
    ss->enoughFirstHsDone = PR_TRUE;

    if (!ss->firstHsDone) {
        if (ss->opt.enableFalseStart) {
            if (!ss->ssl3.hs.authCertificatePending) {
                /* When we fix bug 589047, we will need to know whether we are
                 * false starting before we try to flush the client second
                 * round to the network. With that in mind, we purposefully
                 * call ssl3_CheckFalseStart before calling ssl3_SendFinished,
                 * which includes a call to ssl3_FlushHandshake, so that
                 * no application develops a reliance on such flushing being
                 * done before its false start callback is called.
                 */
                ssl_ReleaseXmitBufLock(ss);
                rv = ssl3_CheckFalseStart(ss);
                ssl_GetXmitBufLock(ss);
                if (rv != SECSuccess) {
                    goto loser;
                }
            } else {
                /* The certificate authentication and the server's Finished
                 * message are racing each other. If the certificate
                 * authentication wins, then we will try to false start in
                 * ssl3_AuthCertificateComplete.
                 */
                SSL_TRC(3, ("%d: SSL3[%p]: deferring false start check because"
                            " certificate authentication is still pending.",
                            SSL_GETPID(), ss->fd));
            }
        }
    }

    rv = ssl3_SendFinished(ss, 0);
    if (rv != SECSuccess) {
        goto loser; /* err code was set. */
    }

    ssl_ReleaseXmitBufLock(ss); /*******************************/

    if (ssl3_ExtensionNegotiated(ss, ssl_session_ticket_xtn))
        ss->ssl3.hs.ws = wait_new_session_ticket;
    else
        ss->ssl3.hs.ws = wait_change_cipher;

    PORT_Assert(ssl3_WaitingForServerSecondRound(ss));

    return SECSuccess;

loser:
    ssl_ReleaseXmitBufLock(ss);
    return rv;
}

/*
 * Routines used by servers
 */
static SECStatus
ssl3_SendHelloRequest(sslSocket *ss)
{
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: send hello_request handshake", SSL_GETPID(),
                ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_hello_request, 0);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake */
    }
    rv = ssl3_FlushHandshake(ss, 0);
    if (rv != SECSuccess) {
        return rv; /* error code set by ssl3_FlushHandshake */
    }
    ss->ssl3.hs.ws = wait_client_hello;
    return SECSuccess;
}

/*
 * Called from:
 *  ssl3_HandleClientHello()
 */
static SECComparison
ssl3_ServerNameCompare(const SECItem *name1, const SECItem *name2)
{
    if (!name1 != !name2) {
        return SECLessThan;
    }
    if (!name1) {
        return SECEqual;
    }
    if (name1->type != name2->type) {
        return SECLessThan;
    }
    return SECITEM_CompareItem(name1, name2);
}

/* Sets memory error when returning NULL.
 * Called from:
 *  ssl3_SendClientHello()
 *  ssl3_HandleServerHello()
 *  ssl3_HandleClientHello()
 *  ssl3_HandleV2ClientHello()
 */
sslSessionID *
ssl3_NewSessionID(sslSocket *ss, PRBool is_server)
{
    sslSessionID *sid;

    sid = PORT_ZNew(sslSessionID);
    if (sid == NULL)
        return sid;

    if (is_server) {
        const SECItem *srvName;
        SECStatus rv = SECSuccess;

        ssl_GetSpecReadLock(ss); /********************************/
        srvName = &ss->ssl3.hs.srvVirtName;
        if (srvName->len && srvName->data) {
            rv = SECITEM_CopyItem(NULL, &sid->u.ssl3.srvName, srvName);
        }
        ssl_ReleaseSpecReadLock(ss); /************************************/
        if (rv != SECSuccess) {
            PORT_Free(sid);
            return NULL;
        }
    }
    sid->peerID = (ss->peerID == NULL) ? NULL : PORT_Strdup(ss->peerID);
    sid->urlSvrName = (ss->url == NULL) ? NULL : PORT_Strdup(ss->url);
    sid->addr = ss->sec.ci.peer;
    sid->port = ss->sec.ci.port;
    sid->references = 1;
    sid->cached = never_cached;
    sid->version = ss->version;
    sid->sigScheme = ssl_sig_none;

    sid->u.ssl3.keys.resumable = PR_TRUE;
    sid->u.ssl3.policy = SSL_ALLOWED;
    sid->u.ssl3.keys.extendedMasterSecretUsed = PR_FALSE;

    if (is_server) {
        SECStatus rv;
        int pid = SSL_GETPID();

        sid->u.ssl3.sessionIDLength = SSL3_SESSIONID_BYTES;
        sid->u.ssl3.sessionID[0] = (pid >> 8) & 0xff;
        sid->u.ssl3.sessionID[1] = pid & 0xff;
        rv = PK11_GenerateRandom(sid->u.ssl3.sessionID + 2,
                                 SSL3_SESSIONID_BYTES - 2);
        if (rv != SECSuccess) {
            ssl_FreeSID(sid);
            ssl_MapLowLevelError(SSL_ERROR_GENERATE_RANDOM_FAILURE);
            return NULL;
        }
    }
    return sid;
}

/* Called from:  ssl3_HandleClientHello, ssl3_HandleV2ClientHello */
static SECStatus
ssl3_SendServerHelloSequence(sslSocket *ss)
{
    const ssl3KEADef *kea_def;
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: begin send server_hello sequence",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));

    rv = ssl3_SendServerHello(ss);
    if (rv != SECSuccess) {
        return rv; /* err code is set. */
    }
    rv = ssl3_SendCertificate(ss);
    if (rv != SECSuccess) {
        return rv; /* error code is set. */
    }
    rv = ssl3_SendCertificateStatus(ss);
    if (rv != SECSuccess) {
        return rv; /* error code is set. */
    }
    /* We have to do this after the call to ssl3_SendServerHello,
     * because kea_def is set up by ssl3_SendServerHello().
     */
    kea_def = ss->ssl3.hs.kea_def;

    if (kea_def->ephemeral) {
        rv = ssl3_SendServerKeyExchange(ss);
        if (rv != SECSuccess) {
            return rv; /* err code was set. */
        }
    }

    if (ss->opt.requestCertificate) {
        rv = ssl3_SendCertificateRequest(ss);
        if (rv != SECSuccess) {
            return rv; /* err code is set. */
        }
    }
    rv = ssl3_SendServerHelloDone(ss);
    if (rv != SECSuccess) {
        return rv; /* err code is set. */
    }

    ss->ssl3.hs.ws = (ss->opt.requestCertificate) ? wait_client_cert
                                                  : wait_client_key;
    return SECSuccess;
}

/* An empty TLS Renegotiation Info (RI) extension */
static const PRUint8 emptyRIext[5] = { 0xff, 0x01, 0x00, 0x01, 0x00 };

static PRBool
ssl3_KEASupportsTickets(const ssl3KEADef *kea_def)
{
    if (kea_def->signKeyType == dsaKey) {
        /* TODO: Fix session tickets for DSS. The server code rejects the
         * session ticket received from the client. Bug 1174677 */
        return PR_FALSE;
    }
    return PR_TRUE;
}

static PRBool
ssl3_PeerSupportsCipherSuite(const SECItem *peerSuites, uint16_t suite)
{
    for (unsigned int i = 0; i + 1 < peerSuites->len; i += 2) {
        PRUint16 suite_i = (peerSuites->data[i] << 8) | peerSuites->data[i + 1];
        if (suite_i == suite) {
            return PR_TRUE;
        }
    }
    return PR_FALSE;
}

SECStatus
ssl3_NegotiateCipherSuiteInner(sslSocket *ss, const SECItem *suites,
                               PRUint16 version, PRUint16 *suitep)
{
    unsigned int i;
    SSLVersionRange vrange = { version, version };

    /* If we negotiated an External PSK and that PSK has a ciphersuite
     * configured, we need to constrain our choice. If the client does
     * not support it, negotiate a certificate auth suite and fall back.
     */
    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
        ss->xtnData.selectedPsk &&
        ss->xtnData.selectedPsk->type == ssl_psk_external &&
        ss->xtnData.selectedPsk->zeroRttSuite != TLS_NULL_WITH_NULL_NULL) {
        PRUint16 pskSuite = ss->xtnData.selectedPsk->zeroRttSuite;
        ssl3CipherSuiteCfg *pskSuiteCfg = ssl_LookupCipherSuiteCfgMutable(pskSuite,
                                                                          ss->cipherSuites);
        if (ssl3_config_match(pskSuiteCfg, ss->ssl3.policy, &vrange, ss) &&
            ssl3_PeerSupportsCipherSuite(suites, pskSuite)) {
            *suitep = pskSuite;
            return SECSuccess;
        }
    }

    for (i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        ssl3CipherSuiteCfg *suite = &ss->cipherSuites[i];
        if (!ssl3_config_match(suite, ss->ssl3.policy, &vrange, ss)) {
            continue;
        }
        if (!ssl3_PeerSupportsCipherSuite(suites, suite->cipher_suite)) {
            continue;
        }
        *suitep = suite->cipher_suite;
        return SECSuccess;
    }
    PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
    return SECFailure;
}

/* Select a cipher suite.
**
** NOTE: This suite selection algorithm should be the same as the one in
** ssl3_HandleV2ClientHello().
**
** If TLS 1.0 is enabled, we could handle the case where the client
** offered TLS 1.1 but offered only export cipher suites by choosing TLS
** 1.0 and selecting one of those export cipher suites. However, a secure
** TLS 1.1 client should not have export cipher suites enabled at all,
** and a TLS 1.1 client should definitely not be offering *only* export
** cipher suites. Therefore, we refuse to negotiate export cipher suites
** with any client that indicates support for TLS 1.1 or higher when we
** (the server) have TLS 1.1 support enabled.
*/
SECStatus
ssl3_NegotiateCipherSuite(sslSocket *ss, const SECItem *suites,
                          PRBool initHashes)
{
    PRUint16 selected;
    SECStatus rv;

    /* Ensure that only valid cipher suites are enabled. */
    if (ssl3_config_match_init(ss) == 0) {
        /* No configured cipher is both supported by PK11 and allowed.
         * This is a configuration error, so report handshake failure.*/
        FATAL_ERROR(ss, PORT_GetError(), handshake_failure);
        return SECFailure;
    }

    rv = ssl3_NegotiateCipherSuiteInner(ss, suites, ss->version, &selected);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    ss->ssl3.hs.cipher_suite = selected;
    return ssl3_SetupCipherSuite(ss, initHashes);
}

/*
 * Call the SNI config hook.
 *
 * Called from:
 *   ssl3_HandleClientHello
 *   tls13_HandleClientHelloPart2
 */
SECStatus
ssl3_ServerCallSNICallback(sslSocket *ss)
{
    int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
    SSL3AlertDescription desc = illegal_parameter;
    int ret = 0;

#ifdef SSL_SNI_ALLOW_NAME_CHANGE_2HS
#error("No longer allowed to set SSL_SNI_ALLOW_NAME_CHANGE_2HS")
#endif
    if (!ssl3_ExtensionNegotiated(ss, ssl_server_name_xtn)) {
        if (ss->firstHsDone) {
            /* Check that we don't have the name is current spec
             * if this extension was not negotiated on the 2d hs. */
            PRBool passed = PR_TRUE;
            ssl_GetSpecReadLock(ss); /*******************************/
            if (ss->ssl3.hs.srvVirtName.data) {
                passed = PR_FALSE;
            }
            ssl_ReleaseSpecReadLock(ss); /***************************/
            if (!passed) {
                errCode = SSL_ERROR_UNRECOGNIZED_NAME_ALERT;
                desc = handshake_failure;
                goto alert_loser;
            }
        }
        return SECSuccess;
    }

    if (ss->sniSocketConfig)
        do { /* not a loop */
            PORT_Assert((ss->ssl3.hs.preliminaryInfo & ssl_preinfo_all) ==
                        ssl_preinfo_all);

            ret = SSL_SNI_SEND_ALERT;
            /* If extension is negotiated, the len of names should > 0. */
            if (ss->xtnData.sniNameArrSize) {
                /* Calling client callback to reconfigure the socket. */
                ret = (SECStatus)(*ss->sniSocketConfig)(ss->fd,
                                                        ss->xtnData.sniNameArr,
                                                        ss->xtnData.sniNameArrSize,
                                                        ss->sniSocketConfigArg);
            }
            if (ret <= SSL_SNI_SEND_ALERT) {
                /* Application does not know the name or was not able to
                 * properly reconfigure the socket. */
                errCode = SSL_ERROR_UNRECOGNIZED_NAME_ALERT;
                desc = unrecognized_name;
                break;
            } else if (ret == SSL_SNI_CURRENT_CONFIG_IS_USED) {
                SECStatus rv = SECSuccess;
                SECItem pwsNameBuf = { 0, NULL, 0 };
                SECItem *pwsName = &pwsNameBuf;
                SECItem *cwsName;

                ssl_GetSpecWriteLock(ss); /*******************************/
                cwsName = &ss->ssl3.hs.srvVirtName;
                /* not allow name change on the 2d HS */
                if (ss->firstHsDone) {
                    if (ssl3_ServerNameCompare(pwsName, cwsName)) {
                        ssl_ReleaseSpecWriteLock(ss); /******************/
                        errCode = SSL_ERROR_UNRECOGNIZED_NAME_ALERT;
                        desc = handshake_failure;
                        ret = SSL_SNI_SEND_ALERT;
                        break;
                    }
                }
                if (pwsName->data) {
                    SECITEM_FreeItem(pwsName, PR_FALSE);
                }
                if (cwsName->data) {
                    rv = SECITEM_CopyItem(NULL, pwsName, cwsName);
                }
                ssl_ReleaseSpecWriteLock(ss); /**************************/
                if (rv != SECSuccess) {
                    errCode = SSL_ERROR_INTERNAL_ERROR_ALERT;
                    desc = internal_error;
                    ret = SSL_SNI_SEND_ALERT;
                    break;
                }
            } else if ((unsigned int)ret < ss->xtnData.sniNameArrSize) {
                /* Application has configured new socket info. Lets check it
                 * and save the name. */
                SECStatus rv;
                SECItem *name = &ss->xtnData.sniNameArr[ret];
                SECItem *pwsName;

                /* get rid of the old name and save the newly picked. */
                /* This code is protected by ssl3HandshakeLock. */
                ssl_GetSpecWriteLock(ss); /*******************************/
                /* not allow name change on the 2d HS */
                if (ss->firstHsDone) {
                    SECItem *cwsName = &ss->ssl3.hs.srvVirtName;
                    if (ssl3_ServerNameCompare(name, cwsName)) {
                        ssl_ReleaseSpecWriteLock(ss); /******************/
                        errCode = SSL_ERROR_UNRECOGNIZED_NAME_ALERT;
                        desc = handshake_failure;
                        ret = SSL_SNI_SEND_ALERT;
                        break;
                    }
                }
                pwsName = &ss->ssl3.hs.srvVirtName;
                if (pwsName->data) {
                    SECITEM_FreeItem(pwsName, PR_FALSE);
                }
                rv = SECITEM_CopyItem(NULL, pwsName, name);
                ssl_ReleaseSpecWriteLock(ss); /***************************/
                if (rv != SECSuccess) {
                    errCode = SSL_ERROR_INTERNAL_ERROR_ALERT;
                    desc = internal_error;
                    ret = SSL_SNI_SEND_ALERT;
                    break;
                }
                /* Need to tell the client that application has picked
                 * the name from the offered list and reconfigured the socket.
                 */
                ssl3_RegisterExtensionSender(ss, &ss->xtnData, ssl_server_name_xtn,
                                             ssl_SendEmptyExtension);
            } else {
                /* Callback returned index outside of the boundary. */
                PORT_Assert((unsigned int)ret < ss->xtnData.sniNameArrSize);
                errCode = SSL_ERROR_INTERNAL_ERROR_ALERT;
                desc = internal_error;
                ret = SSL_SNI_SEND_ALERT;
                break;
            }
        } while (0);
    ssl3_FreeSniNameArray(&ss->xtnData);
    if (ret <= SSL_SNI_SEND_ALERT) {
        /* desc and errCode should be set. */
        goto alert_loser;
    }

    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);
    PORT_SetError(errCode);
    return SECFailure;
}

SECStatus
ssl3_SelectServerCert(sslSocket *ss)
{
    const ssl3KEADef *kea_def = ss->ssl3.hs.kea_def;
    PRCList *cursor;
    SECStatus rv;

    /* If the client didn't include the supported groups extension, assume just
     * P-256 support and disable all the other ECDHE groups.  This also affects
     * ECDHE group selection, but this function is called first. */
    if (!ssl3_ExtensionNegotiated(ss, ssl_supported_groups_xtn)) {
        unsigned int i;
        for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
            if (ss->namedGroupPreferences[i] &&
                ss->namedGroupPreferences[i]->keaType == ssl_kea_ecdh &&
                ss->namedGroupPreferences[i]->name != ssl_grp_ec_secp256r1) {
                ss->namedGroupPreferences[i] = NULL;
            }
        }
    }

    /* This picks the first certificate that has:
     * a) the right authentication method, and
     * b) the right named curve (EC only)
     *
     * We might want to do some sort of ranking here later.  For now, it's all
     * based on what order they are configured in. */
    for (cursor = PR_NEXT_LINK(&ss->serverCerts);
         cursor != &ss->serverCerts;
         cursor = PR_NEXT_LINK(cursor)) {
        sslServerCert *cert = (sslServerCert *)cursor;
        if (kea_def->authKeyType == ssl_auth_rsa_sign) {
            /* We consider PSS certificates here as well for TLS 1.2. */
            if (!SSL_CERT_IS(cert, ssl_auth_rsa_sign) &&
                (!SSL_CERT_IS(cert, ssl_auth_rsa_pss) ||
                 ss->version < SSL_LIBRARY_VERSION_TLS_1_2)) {
                continue;
            }
        } else {
            if (!SSL_CERT_IS(cert, kea_def->authKeyType)) {
                continue;
            }
            if (SSL_CERT_IS_EC(cert) &&
                !ssl_NamedGroupEnabled(ss, cert->namedCurve)) {
                continue;
            }
        }

        /* Found one. */
        ss->sec.serverCert = cert;
        ss->sec.authKeyBits = cert->serverKeyBits;

        /* Don't pick a signature scheme if we aren't going to use it. */
        if (kea_def->signKeyType == nullKey) {
            ss->sec.authType = kea_def->authKeyType;
            return SECSuccess;
        }

        rv = ssl3_PickServerSignatureScheme(ss);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        ss->sec.authType =
            ssl_SignatureSchemeToAuthType(ss->ssl3.hs.signatureScheme);
        return SECSuccess;
    }

    PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
    return SECFailure;
}

static SECStatus
ssl_GenerateServerRandom(sslSocket *ss)
{
    SECStatus rv;
    PRUint8 *downgradeSentinel;

    rv = ssl3_GetNewRandom(ss->ssl3.hs.server_random);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (ss->version == ss->vrange.max) {
        return SECSuccess;
    }
#ifdef DTLS_1_3_DRAFT_VERSION
    if (IS_DTLS(ss)) {
        return SECSuccess;
    }
#endif

    /*
     * [RFC 8446 Section 4.1.3].
     *
     * TLS 1.3 servers which negotiate TLS 1.2 or below in response to a
     * ClientHello MUST set the last 8 bytes of their Random value specially in
     * their ServerHello.
     *
     * If negotiating TLS 1.2, TLS 1.3 servers MUST set the last 8 bytes of
     * their Random value to the bytes:
     *
     *   44 4F 57 4E 47 52 44 01
     *
     * If negotiating TLS 1.1 or below, TLS 1.3 servers MUST, and TLS 1.2
     * servers SHOULD, set the last 8 bytes of their ServerHello.Random value to
     * the bytes:
     *
     *   44 4F 57 4E 47 52 44 00
     */
    downgradeSentinel =
        ss->ssl3.hs.server_random +
        SSL3_RANDOM_LENGTH - sizeof(tls12_downgrade_random);
    if (ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_2) {
        switch (ss->version) {
            case SSL_LIBRARY_VERSION_TLS_1_2:
                /* vrange.max > 1.2, since we didn't early exit above. */
                PORT_Memcpy(downgradeSentinel,
                            tls12_downgrade_random, sizeof(tls12_downgrade_random));
                break;
            case SSL_LIBRARY_VERSION_TLS_1_1:
            case SSL_LIBRARY_VERSION_TLS_1_0:
                PORT_Memcpy(downgradeSentinel,
                            tls1_downgrade_random, sizeof(tls1_downgrade_random));
                break;
            default:
                /* Do not change random. */
                break;
        }
    }

    return SECSuccess;
}

SECStatus
ssl3_HandleClientHelloPreamble(sslSocket *ss, PRUint8 **b, PRUint32 *length, SECItem *sidBytes,
                               SECItem *cookieBytes, SECItem *suites, SECItem *comps)
{
    SECStatus rv;
    PRUint32 tmp;
    rv = ssl3_ConsumeHandshakeNumber(ss, &tmp, 2, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* malformed, alert already sent */
    }

    /* Translate the version. */
    if (IS_DTLS(ss)) {
        ss->clientHelloVersion = dtls_DTLSVersionToTLSVersion((SSL3ProtocolVersion)tmp);
    } else {
        ss->clientHelloVersion = (SSL3ProtocolVersion)tmp;
    }

    /* Grab the client random data. */
    rv = ssl3_ConsumeHandshake(
        ss, ss->ssl3.hs.client_random, SSL3_RANDOM_LENGTH, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* malformed */
    }

    /* Grab the client's SID, if present. */
    rv = ssl3_ConsumeHandshakeVariable(ss, sidBytes, 1, b, length);
    /* Check that the SID has the format: opaque legacy_session_id<0..32>, as
     * specified in RFC8446, Section 4.1.2. */
    if (rv != SECSuccess || sidBytes->len > SSL3_SESSIONID_BYTES) {
        return SECFailure; /* malformed */
    }

    /* Grab the client's cookie, if present. It is checked after version negotiation. */
    if (IS_DTLS(ss)) {
        rv = ssl3_ConsumeHandshakeVariable(ss, cookieBytes, 1, b, length);
        if (rv != SECSuccess) {
            return SECFailure; /* malformed */
        }
    }

    /* Grab the list of cipher suites. */
    rv = ssl3_ConsumeHandshakeVariable(ss, suites, 2, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* malformed */
    }

    /* Grab the list of compression methods. */
    rv = ssl3_ConsumeHandshakeVariable(ss, comps, 1, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* malformed */
    }
    return SECSuccess;
}

static SECStatus
ssl3_ValidatePreambleWithVersion(sslSocket *ss, const SECItem *sidBytes, const SECItem *comps,
                                 const SECItem *cookieBytes)
{
    SECStatus rv;
    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        if (sidBytes->len > 0 && !IS_DTLS(ss)) {
            SECITEM_FreeItem(&ss->ssl3.hs.fakeSid, PR_FALSE);
            rv = SECITEM_CopyItem(NULL, &ss->ssl3.hs.fakeSid, sidBytes);
            if (rv != SECSuccess) {
                FATAL_ERROR(ss, PORT_GetError(), internal_error);
                return SECFailure;
            }
        }

        /* TLS 1.3 requires that compression include only null. */
        if (comps->len != 1 || comps->data[0] != ssl_compression_null) {
            FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
            return SECFailure;
        }

        /* receivedCcs is only valid if we sent an HRR. */
        if (ss->ssl3.hs.receivedCcs && !ss->ssl3.hs.helloRetry) {
            FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER, unexpected_message);
            return SECFailure;
        }

        /* A DTLS 1.3-only client MUST set the legacy_cookie field to zero length.
         * If a DTLS 1.3 ClientHello is received with any other value in this field,
         * the server MUST abort the handshake with an "illegal_parameter" alert. */
        if (IS_DTLS(ss) && cookieBytes->len != 0) {
            FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
            return SECFailure;
        }
    } else {
        /* ECH not possible here. */
        ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_ech;

        /* HRR and ECH are TLS1.3-only. We ignore the Cookie extension here. */
        if (ss->ssl3.hs.helloRetry) {
            FATAL_ERROR(ss, SSL_ERROR_UNSUPPORTED_VERSION, protocol_version);
            return SECFailure;
        }

        /* receivedCcs is only valid if we sent an HRR. */
        if (ss->ssl3.hs.receivedCcs) {
            FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER, unexpected_message);
            return SECFailure;
        }

        /* TLS versions prior to 1.3 must include null somewhere. */
        if (comps->len < 1 ||
            !memchr(comps->data, ssl_compression_null, comps->len)) {
            FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
            return SECFailure;
        }

        /* We never send cookies in DTLS 1.2. */
        if (IS_DTLS(ss) && cookieBytes->len != 0) {
            FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
            return SECFailure;
        }
    }

    return SECSuccess;
}

/* Called from ssl3_HandleHandshakeMessage() when it has deciphered a complete
 * ssl3 Client Hello message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleClientHello(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    sslSessionID *sid = NULL;
    unsigned int i;
    SECStatus rv;
    PRUint32 extensionLength;
    int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
    SSL3AlertDescription desc = illegal_parameter;
    SSL3AlertLevel level = alert_fatal;
    TLSExtension *versionExtension;
    SECItem sidBytes = { siBuffer, NULL, 0 };
    SECItem cookieBytes = { siBuffer, NULL, 0 };
    SECItem suites = { siBuffer, NULL, 0 };
    SECItem comps = { siBuffer, NULL, 0 };
    SECItem *echInner = NULL;
    PRBool isTLS13;
    const PRUint8 *savedMsg = b;
    const PRUint32 savedLen = length;

    SSL_TRC(3, ("%d: SSL3[%d]: handle client_hello handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    ss->ssl3.hs.preliminaryInfo = 0;

    if (!ss->sec.isServer ||
        (ss->ssl3.hs.ws != wait_client_hello &&
         ss->ssl3.hs.ws != idle_handshake)) {
        desc = unexpected_message;
        errCode = SSL_ERROR_RX_UNEXPECTED_CLIENT_HELLO;
        goto alert_loser;
    }
    if (ss->ssl3.hs.ws == idle_handshake) {
        /* Refuse re-handshake when we have already negotiated TLS 1.3. */
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
            desc = unexpected_message;
            errCode = SSL_ERROR_RENEGOTIATION_NOT_ALLOWED;
            goto alert_loser;
        }
        if (ss->opt.enableRenegotiation == SSL_RENEGOTIATE_NEVER) {
            desc = no_renegotiation;
            level = alert_warning;
            errCode = SSL_ERROR_RENEGOTIATION_NOT_ALLOWED;
            goto alert_loser;
        }
    }

    /* We should always be in a fresh state. */
    SSL_ASSERT_HASHES_EMPTY(ss);

    /* Get peer name of client */
    rv = ssl_GetPeerInfo(ss);
    if (rv != SECSuccess) {
        return rv; /* error code is set. */
    }

    /* We might be starting session renegotiation in which case we should
     * clear previous state.
     */
    ssl3_ResetExtensionData(&ss->xtnData, ss);
    ss->statelessResume = PR_FALSE;

    if (IS_DTLS(ss)) {
        dtls_RehandshakeCleanup(ss);
    }

    rv = ssl3_HandleClientHelloPreamble(ss, &b, &length, &sidBytes,
                                        &cookieBytes, &suites, &comps);
    if (rv != SECSuccess) {
        goto loser; /* malformed */
    }

    /* Handle TLS hello extensions for SSL3 & TLS. We do not know if
     * we are restarting a previous session until extensions have been
     * parsed, since we might have received a SessionTicket extension.
     * Note: we allow extensions even when negotiating SSL3 for the sake
     * of interoperability (and backwards compatibility).
     */
    if (length) {
        /* Get length of hello extensions */
        rv = ssl3_ConsumeHandshakeNumber(ss, &extensionLength, 2, &b, &length);
        if (rv != SECSuccess) {
            goto loser; /* alert already sent */
        }
        if (extensionLength != length) {
            errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
            desc = decode_error;
            goto alert_loser;
        }

        rv = ssl3_ParseExtensions(ss, &b, &length);
        if (rv != SECSuccess) {
            goto loser; /* malformed */
        }
    }

    versionExtension = ssl3_FindExtension(ss, ssl_tls13_supported_versions_xtn);
    if (versionExtension) {
        rv = tls13_NegotiateVersion(ss, versionExtension);
        if (rv != SECSuccess) {
            errCode = PORT_GetError();
            desc = (errCode == SSL_ERROR_UNSUPPORTED_VERSION) ? protocol_version : illegal_parameter;
            goto alert_loser;
        }
    } else {
        /* The PR_MIN here ensures that we never negotiate 1.3 if the
         * peer didn't offer "supported_versions". */
        rv = ssl3_NegotiateVersion(ss,
                                   PR_MIN(ss->clientHelloVersion,
                                          SSL_LIBRARY_VERSION_TLS_1_2),
                                   PR_TRUE);
        /* Send protocol version alert if the ClientHello.legacy_version is not
         * supported by the server.
         *
         * If the "supported_versions" extension is absent and the server only
         * supports versions greater than ClientHello.legacy_version, the
         * server MUST abort the handshake with a "protocol_version" alert
         * [RFC8446, Appendix D.2]. */
        if (rv != SECSuccess) {
            desc = protocol_version;
            errCode = SSL_ERROR_UNSUPPORTED_VERSION;
            goto alert_loser;
        }
    }
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_version;

    /* Update the write spec to match the selected version. */
    if (!ss->firstHsDone) {
        ssl_GetSpecWriteLock(ss);
        ssl_SetSpecVersions(ss, ss->ssl3.cwSpec);
        ssl_ReleaseSpecWriteLock(ss);
    }

    isTLS13 = ss->version >= SSL_LIBRARY_VERSION_TLS_1_3;
    if (isTLS13) {
        if (ss->firstHsDone) {
            desc = unexpected_message;
            errCode = SSL_ERROR_RENEGOTIATION_NOT_ALLOWED;
            goto alert_loser;
        }

        /* If there is a cookie, then this is a second ClientHello (TLS 1.3). */
        if (ssl3_FindExtension(ss, ssl_tls13_cookie_xtn)) {
            ss->ssl3.hs.helloRetry = PR_TRUE;
        }

        rv = tls13_MaybeHandleEch(ss, savedMsg, savedLen, &sidBytes,
                                  &comps, &cookieBytes, &suites, &echInner);
        if (rv != SECSuccess) {
            errCode = PORT_GetError();
            goto loser; /* code set, alert sent. */
        }
    }

    rv = ssl3_ValidatePreambleWithVersion(ss, &sidBytes, &comps, &cookieBytes);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        goto loser; /* code set, alert sent. */
    }

    /* Now parse the rest of the extensions. */
    rv = ssl3_HandleParsedExtensions(ss, ssl_hs_client_hello);
    ssl3_DestroyRemoteExtensions(&ss->ssl3.hs.remoteExtensions);
    if (rv != SECSuccess) {
        if (PORT_GetError() == SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM) {
            errCode = SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM;
        }
        goto loser; /* malformed */
    }

    /* If the ClientHello version is less than our maximum version, check for a
     * TLS_FALLBACK_SCSV and reject the connection if found. */
    if (ss->vrange.max > ss->version) {
        for (i = 0; i + 1 < suites.len; i += 2) {
            PRUint16 suite_i = (suites.data[i] << 8) | suites.data[i + 1];
            if (suite_i != TLS_FALLBACK_SCSV)
                continue;
            desc = inappropriate_fallback;
            errCode = SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT;
            goto alert_loser;
        }
    }

    if (!ssl3_ExtensionNegotiated(ss, ssl_renegotiation_info_xtn)) {
        /* If we didn't receive an RI extension, look for the SCSV,
         * and if found, treat it just like an empty RI extension
         * by processing a local copy of an empty RI extension.
         */
        for (i = 0; i + 1 < suites.len; i += 2) {
            PRUint16 suite_i = (suites.data[i] << 8) | suites.data[i + 1];
            if (suite_i == TLS_EMPTY_RENEGOTIATION_INFO_SCSV) {
                PRUint8 *b2 = (PRUint8 *)emptyRIext;
                PRUint32 L2 = sizeof emptyRIext;
                (void)ssl3_HandleExtensions(ss, &b2, &L2, ssl_hs_client_hello);
                break;
            }
        }
    }

    /* The check for renegotiation in TLS 1.3 is earlier. */
    if (!isTLS13) {
        if (ss->firstHsDone &&
            (ss->opt.enableRenegotiation == SSL_RENEGOTIATE_REQUIRES_XTN ||
             ss->opt.enableRenegotiation == SSL_RENEGOTIATE_TRANSITIONAL) &&
            !ssl3_ExtensionNegotiated(ss, ssl_renegotiation_info_xtn)) {
            desc = no_renegotiation;
            level = alert_warning;
            errCode = SSL_ERROR_RENEGOTIATION_NOT_ALLOWED;
            goto alert_loser;
        }
        if ((ss->opt.requireSafeNegotiation ||
             (ss->firstHsDone && ss->peerRequestedProtection)) &&
            !ssl3_ExtensionNegotiated(ss, ssl_renegotiation_info_xtn)) {
            desc = handshake_failure;
            errCode = SSL_ERROR_UNSAFE_NEGOTIATION;
            goto alert_loser;
        }
    }

    /* We do stateful resumes only if we are in TLS < 1.3 and
     * either of the following conditions are satisfied:
     * (1) the client does not support the session ticket extension, or
     * (2) the client support the session ticket extension, but sent an
     * empty ticket.
     */
    if (!isTLS13 &&
        (!ssl3_ExtensionNegotiated(ss, ssl_session_ticket_xtn) ||
         ss->xtnData.emptySessionTicket)) {
        if (sidBytes.len > 0 && !ss->opt.noCache) {
            SSL_TRC(7, ("%d: SSL3[%d]: server, lookup client session-id for 0x%08x%08x%08x%08x",
                        SSL_GETPID(), ss->fd, ss->sec.ci.peer.pr_s6_addr32[0],
                        ss->sec.ci.peer.pr_s6_addr32[1],
                        ss->sec.ci.peer.pr_s6_addr32[2],
                        ss->sec.ci.peer.pr_s6_addr32[3]));
            if (ssl_sid_lookup) {
                sid = (*ssl_sid_lookup)(ssl_Time(ss), &ss->sec.ci.peer,
                                        sidBytes.data, sidBytes.len, ss->dbHandle);
            } else {
                errCode = SSL_ERROR_SERVER_CACHE_NOT_CONFIGURED;
                goto loser;
            }
        }
    } else if (ss->statelessResume) {
        /* Fill in the client's session ID if doing a stateless resume.
         * (When doing stateless resumes, server echos client's SessionID.)
         * This branch also handles TLS 1.3 resumption-PSK.
         */
        sid = ss->sec.ci.sid;
        PORT_Assert(sid != NULL); /* Should have already been filled in.*/

        if (sidBytes.len > 0 && sidBytes.len <= SSL3_SESSIONID_BYTES) {
            sid->u.ssl3.sessionIDLength = sidBytes.len;
            PORT_Memcpy(sid->u.ssl3.sessionID, sidBytes.data,
                        sidBytes.len);
            sid->u.ssl3.sessionIDLength = sidBytes.len;
        } else {
            sid->u.ssl3.sessionIDLength = 0;
        }
        ss->sec.ci.sid = NULL;
    }

    /* Free a potentially leftover session ID from a previous handshake. */
    if (ss->sec.ci.sid) {
        ssl_FreeSID(ss->sec.ci.sid);
        ss->sec.ci.sid = NULL;
    }

    if (sid != NULL) {
        /* We've found a session cache entry for this client.
         * Now, if we're going to require a client-auth cert,
         * and we don't already have this client's cert in the session cache,
         * and this is the first handshake on this connection (not a redo),
         * then drop this old cache entry and start a new session.
         */
        if ((sid->peerCert == NULL) && ss->opt.requestCertificate &&
            ((ss->opt.requireCertificate == SSL_REQUIRE_ALWAYS) ||
             (ss->opt.requireCertificate == SSL_REQUIRE_NO_ERROR) ||
             ((ss->opt.requireCertificate == SSL_REQUIRE_FIRST_HANDSHAKE) &&
              !ss->firstHsDone))) {

            SSL_AtomicIncrementLong(&ssl3stats.hch_sid_cache_not_ok);
            ssl_FreeSID(sid);
            sid = NULL;
            ss->statelessResume = PR_FALSE;
        }
    }

    if (IS_DTLS(ss)) {
        ssl3_DisableNonDTLSSuites(ss);
        dtls_ReceivedFirstMessageInFlight(ss);
    }

    if (isTLS13) {
        rv = tls13_HandleClientHelloPart2(ss, &suites, sid,
                                          ss->ssl3.hs.echAccepted ? echInner->data : savedMsg,
                                          ss->ssl3.hs.echAccepted ? echInner->len : savedLen);
        SECITEM_FreeItem(echInner, PR_TRUE);
        echInner = NULL;
    } else {
        rv = ssl3_HandleClientHelloPart2(ss, &suites, sid,
                                         savedMsg, savedLen);
    }
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        goto loser;
    }
    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, level, desc);
/* FALLTHRU */
loser:
    SECITEM_FreeItem(echInner, PR_TRUE);
    PORT_SetError(errCode);
    return SECFailure;
}

/* unwrap helper function to handle the case where the wrapKey doesn't wind
 * up in the correct token for the master secret */
PK11SymKey *
ssl_unwrapSymKey(PK11SymKey *wrapKey,
                 CK_MECHANISM_TYPE wrapType, SECItem *param,
                 SECItem *wrappedKey,
                 CK_MECHANISM_TYPE target, CK_ATTRIBUTE_TYPE operation,
                 int keySize, CK_FLAGS keyFlags, void *pinArg)
{
    PK11SymKey *unwrappedKey;

    /* unwrap the master secret. */
    unwrappedKey = PK11_UnwrapSymKeyWithFlags(wrapKey, wrapType, param,
                                              wrappedKey, target, operation, keySize,
                                              keyFlags);
    if (!unwrappedKey) {
        PK11SlotInfo *targetSlot = PK11_GetBestSlot(target, pinArg);
        PK11SymKey *newWrapKey;

        /* it's possible that we failed to unwrap because the wrapKey is in
         * a slot that can't handle target. Move the wrapKey to a slot that
         * can handle this mechanism and retry the operation */
        if (targetSlot == NULL) {
            return NULL;
        }
        newWrapKey = PK11_MoveSymKey(targetSlot, CKA_UNWRAP, 0,
                                     PR_FALSE, wrapKey);
        PK11_FreeSlot(targetSlot);
        if (newWrapKey == NULL) {
            return NULL;
        }
        unwrappedKey = PK11_UnwrapSymKeyWithFlags(newWrapKey, wrapType, param,
                                                  wrappedKey, target, operation, keySize,
                                                  keyFlags);
        PK11_FreeSymKey(newWrapKey);
    }
    return unwrappedKey;
}

static SECStatus
ssl3_UnwrapMasterSecretServer(sslSocket *ss, sslSessionID *sid, PK11SymKey **ms)
{
    PK11SymKey *wrapKey;
    CK_FLAGS keyFlags = 0;
    SECItem wrappedMS = {
        siBuffer,
        sid->u.ssl3.keys.wrapped_master_secret,
        sid->u.ssl3.keys.wrapped_master_secret_len
    };

    wrapKey = ssl3_GetWrappingKey(ss, NULL, sid->u.ssl3.masterWrapMech,
                                  ss->pkcs11PinArg);
    if (!wrapKey) {
        return SECFailure;
    }

    if (ss->version > SSL_LIBRARY_VERSION_3_0) { /* isTLS */
        keyFlags = CKF_SIGN | CKF_VERIFY;
    }

    *ms = ssl_unwrapSymKey(wrapKey, sid->u.ssl3.masterWrapMech, NULL,
                           &wrappedMS, CKM_SSL3_MASTER_KEY_DERIVE,
                           CKA_DERIVE, SSL3_MASTER_SECRET_LENGTH,
                           keyFlags, ss->pkcs11PinArg);
    PK11_FreeSymKey(wrapKey);
    if (!*ms) {
        SSL_TRC(10, ("%d: SSL3[%d]: server wrapping key found, but couldn't unwrap MasterSecret. wrapMech=0x%0lx",
                     SSL_GETPID(), ss->fd, sid->u.ssl3.masterWrapMech));
        return SECFailure;
    }
    return SECSuccess;
}

static SECStatus
ssl3_HandleClientHelloPart2(sslSocket *ss,
                            SECItem *suites,
                            sslSessionID *sid,
                            const PRUint8 *msg,
                            unsigned int len)
{
    PRBool haveXmitBufLock = PR_FALSE;
    int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
    SSL3AlertDescription desc = illegal_parameter;
    SECStatus rv;
    unsigned int i;
    unsigned int j;

    rv = ssl_HashHandshakeMessage(ss, ssl_hs_client_hello, msg, len);
    if (rv != SECSuccess) {
        errCode = SEC_ERROR_LIBRARY_FAILURE;
        desc = internal_error;
        goto alert_loser;
    }

    /* If we already have a session for this client, be sure to pick the same
    ** cipher suite we picked before.  This is not a loop, despite appearances.
    */
    if (sid)
        do {
            ssl3CipherSuiteCfg *suite;
            SSLVersionRange vrange = { ss->version, ss->version };

            suite = ss->cipherSuites;
            /* Find the entry for the cipher suite used in the cached session. */
            for (j = ssl_V3_SUITES_IMPLEMENTED; j > 0; --j, ++suite) {
                if (suite->cipher_suite == sid->u.ssl3.cipherSuite)
                    break;
            }
            PORT_Assert(j > 0);
            if (j == 0)
                break;

            /* Double check that the cached cipher suite is still enabled,
             * implemented, and allowed by policy.  Might have been disabled.
             */
            if (ssl3_config_match_init(ss) == 0) {
                desc = handshake_failure;
                errCode = PORT_GetError();
                goto alert_loser;
            }
            if (!ssl3_config_match(suite, ss->ssl3.policy, &vrange, ss))
                break;

            /* Double check that the cached cipher suite is in the client's
             * list.  If it isn't, fall through and start a new session. */
            for (i = 0; i + 1 < suites->len; i += 2) {
                PRUint16 suite_i = (suites->data[i] << 8) | suites->data[i + 1];
                if (suite_i == suite->cipher_suite) {
                    ss->ssl3.hs.cipher_suite = suite_i;
                    rv = ssl3_SetupCipherSuite(ss, PR_TRUE);
                    if (rv != SECSuccess) {
                        desc = internal_error;
                        errCode = PORT_GetError();
                        goto alert_loser;
                    }

                    goto cipher_found;
                }
            }
        } while (0);
    /* START A NEW SESSION */

    rv = ssl3_NegotiateCipherSuite(ss, suites, PR_TRUE);
    if (rv != SECSuccess) {
        desc = handshake_failure;
        errCode = PORT_GetError();
        goto alert_loser;
    }

cipher_found:
    suites->data = NULL;

    /* If there are any failures while processing the old sid,
     * we don't consider them to be errors.  Instead, We just behave
     * as if the client had sent us no sid to begin with, and make a new one.
     * The exception here is attempts to resume extended_master_secret
     * sessions without the extension, which causes an alert.
     */
    if (sid != NULL)
        do {
            PK11SymKey *masterSecret;

            if (sid->version != ss->version ||
                sid->u.ssl3.cipherSuite != ss->ssl3.hs.cipher_suite) {
                break; /* not an error */
            }

            /* server sids don't remember the server cert we previously sent,
            ** but they do remember the slot we originally used, so we
            ** can locate it again, provided that the current ssl socket
            ** has had its server certs configured the same as the previous one.
            */
            ss->sec.serverCert = ssl_FindServerCert(ss, sid->authType, sid->namedCurve);
            if (!ss->sec.serverCert || !ss->sec.serverCert->serverCert) {
                /* A compatible certificate must not have been configured.  It
                 * might not be the same certificate, but we only find that out
                 * when the ticket fails to decrypt. */
                break;
            }

            /* [draft-ietf-tls-session-hash-06; Section 5.3]
             * o  If the original session did not use the "extended_master_secret"
             *    extension but the new ClientHello contains the extension, then the
             *    server MUST NOT perform the abbreviated handshake.  Instead, it
             *    SHOULD continue with a full handshake (as described in
             *    Section 5.2) to negotiate a new session.
             *
             * o  If the original session used the "extended_master_secret"
             *    extension but the new ClientHello does not contain the extension,
             *    the server MUST abort the abbreviated handshake.
             */
            if (ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn)) {
                if (!sid->u.ssl3.keys.extendedMasterSecretUsed) {
                    break; /* not an error */
                }
            } else {
                if (sid->u.ssl3.keys.extendedMasterSecretUsed) {
                    /* Note: we do not destroy the session */
                    desc = handshake_failure;
                    errCode = SSL_ERROR_MISSING_EXTENDED_MASTER_SECRET;
                    goto alert_loser;
                }
            }

            if (ss->sec.ci.sid) {
                ssl_UncacheSessionID(ss);
                PORT_Assert(ss->sec.ci.sid != sid); /* should be impossible, but ... */
                if (ss->sec.ci.sid != sid) {
                    ssl_FreeSID(ss->sec.ci.sid);
                }
                ss->sec.ci.sid = NULL;
            }

            /* we need to resurrect the master secret.... */
            rv = ssl3_UnwrapMasterSecretServer(ss, sid, &masterSecret);
            if (rv != SECSuccess) {
                break; /* not an error */
            }

            ss->sec.ci.sid = sid;
            if (sid->peerCert != NULL) {
                ss->sec.peerCert = CERT_DupCertificate(sid->peerCert);
            }

            /*
             * Old SID passed all tests, so resume this old session.
             */
            SSL_AtomicIncrementLong(&ssl3stats.hch_sid_cache_hits);
            if (ss->statelessResume)
                SSL_AtomicIncrementLong(&ssl3stats.hch_sid_stateless_resumes);
            ss->ssl3.hs.isResuming = PR_TRUE;

            ss->sec.authType = sid->authType;
            ss->sec.authKeyBits = sid->authKeyBits;
            ss->sec.keaType = sid->keaType;
            ss->sec.keaKeyBits = sid->keaKeyBits;
            ss->sec.originalKeaGroup = ssl_LookupNamedGroup(sid->keaGroup);
            ss->sec.signatureScheme = sid->sigScheme;

            ss->sec.localCert =
                CERT_DupCertificate(ss->sec.serverCert->serverCert);

            /* Copy cached name in to pending spec */
            if (sid != NULL &&
                sid->version > SSL_LIBRARY_VERSION_3_0 &&
                sid->u.ssl3.srvName.len && sid->u.ssl3.srvName.data) {
                /* Set server name from sid */
                SECItem *sidName = &sid->u.ssl3.srvName;
                SECItem *pwsName = &ss->ssl3.hs.srvVirtName;
                if (pwsName->data) {
                    SECITEM_FreeItem(pwsName, PR_FALSE);
                }
                rv = SECITEM_CopyItem(NULL, pwsName, sidName);
                if (rv != SECSuccess) {
                    errCode = PORT_GetError();
                    desc = internal_error;
                    goto alert_loser;
                }
            }

            /* Clean up sni name array */
            ssl3_FreeSniNameArray(&ss->xtnData);

            ssl_GetXmitBufLock(ss);
            haveXmitBufLock = PR_TRUE;

            rv = ssl3_SendServerHello(ss);
            if (rv != SECSuccess) {
                errCode = PORT_GetError();
                goto loser;
            }

            /* We are re-using the old MS, so no need to derive again. */
            rv = ssl3_InitPendingCipherSpecs(ss, masterSecret, PR_FALSE);
            if (rv != SECSuccess) {
                errCode = PORT_GetError();
                goto loser;
            }

            rv = ssl3_SendChangeCipherSpecs(ss);
            if (rv != SECSuccess) {
                errCode = PORT_GetError();
                goto loser;
            }
            rv = ssl3_SendFinished(ss, 0);
            ss->ssl3.hs.ws = wait_change_cipher;
            if (rv != SECSuccess) {
                errCode = PORT_GetError();
                goto loser;
            }

            if (haveXmitBufLock) {
                ssl_ReleaseXmitBufLock(ss);
            }

            return SECSuccess;
        } while (0);

    if (sid) { /* we had a sid, but it's no longer valid, free it */
        ss->statelessResume = PR_FALSE;
        SSL_AtomicIncrementLong(&ssl3stats.hch_sid_cache_not_ok);
        ssl_UncacheSessionID(ss);
        ssl_FreeSID(sid);
        sid = NULL;
    }
    SSL_AtomicIncrementLong(&ssl3stats.hch_sid_cache_misses);

    /* We only send a session ticket extension if the client supports
     * the extension and we are unable to resume.
     *
     * TODO: send a session ticket if performing a stateful
     * resumption.  (As per RFC4507, a server may issue a session
     * ticket while doing a (stateless or stateful) session resume,
     * but OpenSSL-0.9.8g does not accept session tickets while
     * resuming.)
     */
    if (ssl3_ExtensionNegotiated(ss, ssl_session_ticket_xtn) &&
        ssl3_KEASupportsTickets(ss->ssl3.hs.kea_def)) {
        ssl3_RegisterExtensionSender(ss, &ss->xtnData, ssl_session_ticket_xtn,
                                     ssl_SendEmptyExtension);
    }

    rv = ssl3_ServerCallSNICallback(ss);
    if (rv != SECSuccess) {
        /* The alert has already been sent. */
        errCode = PORT_GetError();
        goto loser;
    }

    rv = ssl3_SelectServerCert(ss);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        desc = handshake_failure;
        goto alert_loser;
    }

    sid = ssl3_NewSessionID(ss, PR_TRUE);
    if (sid == NULL) {
        errCode = PORT_GetError();
        goto loser; /* memory error is set. */
    }
    ss->sec.ci.sid = sid;

    sid->u.ssl3.keys.extendedMasterSecretUsed =
        ssl3_ExtensionNegotiated(ss, ssl_extended_master_secret_xtn);
    ss->ssl3.hs.isResuming = PR_FALSE;

    ssl_GetXmitBufLock(ss);
    rv = ssl3_SendServerHelloSequence(ss);
    ssl_ReleaseXmitBufLock(ss);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        desc = handshake_failure;
        goto alert_loser;
    }

    if (haveXmitBufLock) {
        ssl_ReleaseXmitBufLock(ss);
    }

    return SECSuccess;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);
/* FALLTHRU */
loser:
    if (sid && sid != ss->sec.ci.sid) {
        ssl_UncacheSessionID(ss);
        ssl_FreeSID(sid);
    }

    if (haveXmitBufLock) {
        ssl_ReleaseXmitBufLock(ss);
    }

    PORT_SetError(errCode);
    return SECFailure;
}

/*
 * ssl3_HandleV2ClientHello is used when a V2 formatted hello comes
 * in asking to use the V3 handshake.
 */
SECStatus
ssl3_HandleV2ClientHello(sslSocket *ss, unsigned char *buffer, unsigned int length,
                         PRUint8 padding)
{
    sslSessionID *sid = NULL;
    unsigned char *suites;
    unsigned char *random;
    SSL3ProtocolVersion version;
    SECStatus rv;
    unsigned int i;
    unsigned int j;
    unsigned int sid_length;
    unsigned int suite_length;
    unsigned int rand_length;
    int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
    SSL3AlertDescription desc = handshake_failure;
    unsigned int total = SSL_HL_CLIENT_HELLO_HBYTES;

    SSL_TRC(3, ("%d: SSL3[%d]: handle v2 client_hello", SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));

    ssl_GetSSL3HandshakeLock(ss);

    version = (buffer[1] << 8) | buffer[2];
    if (version < SSL_LIBRARY_VERSION_3_0) {
        goto loser;
    }

    ssl3_RestartHandshakeHashes(ss);

    if (ss->ssl3.hs.ws != wait_client_hello) {
        desc = unexpected_message;
        errCode = SSL_ERROR_RX_UNEXPECTED_CLIENT_HELLO;
        goto alert_loser;
    }

    total += suite_length = (buffer[3] << 8) | buffer[4];
    total += sid_length = (buffer[5] << 8) | buffer[6];
    total += rand_length = (buffer[7] << 8) | buffer[8];
    total += padding;
    ss->clientHelloVersion = version;

    if (version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        /* [draft-ietf-tls-tls-11; C.3] forbids sending a TLS 1.3
         * ClientHello using the backwards-compatible format. */
        desc = illegal_parameter;
        errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
        goto alert_loser;
    }

    rv = ssl3_NegotiateVersion(ss, version, PR_TRUE);
    if (rv != SECSuccess) {
        /* send back which ever alert client will understand. */
        desc = (version > SSL_LIBRARY_VERSION_3_0) ? protocol_version
                                                   : handshake_failure;
        errCode = SSL_ERROR_UNSUPPORTED_VERSION;
        goto alert_loser;
    }
    /* ECH not possible here. */
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_ech;
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_version;
    if (!ss->firstHsDone) {
        ssl_GetSpecWriteLock(ss);
        ssl_SetSpecVersions(ss, ss->ssl3.cwSpec);
        ssl_ReleaseSpecWriteLock(ss);
    }

    /* if we get a non-zero SID, just ignore it. */
    if (length != total) {
        SSL_DBG(("%d: SSL3[%d]: bad v2 client hello message, len=%d should=%d",
                 SSL_GETPID(), ss->fd, length, total));
        desc = illegal_parameter;
        errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
        goto alert_loser;
    }

    suites = buffer + SSL_HL_CLIENT_HELLO_HBYTES;
    random = suites + suite_length + sid_length;

    if (rand_length < SSL_MIN_CHALLENGE_BYTES ||
        rand_length > SSL_MAX_CHALLENGE_BYTES) {
        desc = illegal_parameter;
        errCode = SSL_ERROR_RX_MALFORMED_CLIENT_HELLO;
        goto alert_loser;
    }

    PORT_Assert(SSL_MAX_CHALLENGE_BYTES == SSL3_RANDOM_LENGTH);

    PORT_Memset(ss->ssl3.hs.client_random, 0, SSL3_RANDOM_LENGTH);
    PORT_Memcpy(&ss->ssl3.hs.client_random[SSL3_RANDOM_LENGTH - rand_length],
                random, rand_length);

    PRINT_BUF(60, (ss, "client random:", ss->ssl3.hs.client_random,
                   SSL3_RANDOM_LENGTH));

    if (ssl3_config_match_init(ss) == 0) {
        errCode = PORT_GetError(); /* error code is already set. */
        goto alert_loser;
    }

    /* Select a cipher suite.
    **
    ** NOTE: This suite selection algorithm should be the same as the one in
    ** ssl3_HandleClientHello().
    */
    for (j = 0; j < ssl_V3_SUITES_IMPLEMENTED; j++) {
        ssl3CipherSuiteCfg *suite = &ss->cipherSuites[j];
        SSLVersionRange vrange = { ss->version, ss->version };
        if (!ssl3_config_match(suite, ss->ssl3.policy, &vrange, ss)) {
            continue;
        }
        for (i = 0; i + 2 < suite_length; i += 3) {
            PRUint32 suite_i = (suites[i] << 16) | (suites[i + 1] << 8) | suites[i + 2];
            if (suite_i == suite->cipher_suite) {
                ss->ssl3.hs.cipher_suite = suite_i;
                rv = ssl3_SetupCipherSuite(ss, PR_TRUE);
                if (rv != SECSuccess) {
                    desc = internal_error;
                    errCode = PORT_GetError();
                    goto alert_loser;
                }
                goto suite_found;
            }
        }
    }
    errCode = SSL_ERROR_NO_CYPHER_OVERLAP;
    goto alert_loser;

suite_found:

    /* If the ClientHello version is less than our maximum version, check for a
     * TLS_FALLBACK_SCSV and reject the connection if found. */
    if (ss->vrange.max > ss->clientHelloVersion) {
        for (i = 0; i + 2 < suite_length; i += 3) {
            PRUint16 suite_i = (suites[i] << 16) | (suites[i + 1] << 8) | suites[i + 2];
            if (suite_i == TLS_FALLBACK_SCSV) {
                desc = inappropriate_fallback;
                errCode = SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT;
                goto alert_loser;
            }
        }
    }

    /* Look for the SCSV, and if found, treat it just like an empty RI
     * extension by processing a local copy of an empty RI extension.
     */
    for (i = 0; i + 2 < suite_length; i += 3) {
        PRUint32 suite_i = (suites[i] << 16) | (suites[i + 1] << 8) | suites[i + 2];
        if (suite_i == TLS_EMPTY_RENEGOTIATION_INFO_SCSV) {
            PRUint8 *b2 = (PRUint8 *)emptyRIext;
            PRUint32 L2 = sizeof emptyRIext;
            (void)ssl3_HandleExtensions(ss, &b2, &L2, ssl_hs_client_hello);
            break;
        }
    }

    if (ss->opt.requireSafeNegotiation &&
        !ssl3_ExtensionNegotiated(ss, ssl_renegotiation_info_xtn)) {
        desc = handshake_failure;
        errCode = SSL_ERROR_UNSAFE_NEGOTIATION;
        goto alert_loser;
    }

    rv = ssl3_SelectServerCert(ss);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        desc = handshake_failure;
        goto alert_loser;
    }

    /* we don't even search for a cache hit here.  It's just a miss. */
    SSL_AtomicIncrementLong(&ssl3stats.hch_sid_cache_misses);
    sid = ssl3_NewSessionID(ss, PR_TRUE);
    if (sid == NULL) {
        errCode = PORT_GetError();
        goto loser; /* memory error is set. */
    }
    ss->sec.ci.sid = sid;
    /* do not worry about memory leak of sid since it now belongs to ci */

    /* We have to update the handshake hashes before we can send stuff */
    rv = ssl3_UpdateHandshakeHashes(ss, buffer, length);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        goto loser;
    }

    ssl_GetXmitBufLock(ss);
    rv = ssl3_SendServerHelloSequence(ss);
    ssl_ReleaseXmitBufLock(ss);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        goto loser;
    }

    ssl_ReleaseSSL3HandshakeLock(ss);
    return SECSuccess;

alert_loser:
    SSL3_SendAlert(ss, alert_fatal, desc);
loser:
    ssl_ReleaseSSL3HandshakeLock(ss);
    PORT_SetError(errCode);
    return SECFailure;
}

SECStatus
ssl_ConstructServerHello(sslSocket *ss, PRBool helloRetry,
                         const sslBuffer *extensionBuf, sslBuffer *messageBuf)
{
    SECStatus rv;
    SSL3ProtocolVersion version;
    sslSessionID *sid = ss->sec.ci.sid;
    const PRUint8 *random;

    version = PR_MIN(ss->version, SSL_LIBRARY_VERSION_TLS_1_2);
    if (IS_DTLS(ss)) {
        version = dtls_TLSVersionToDTLSVersion(version);
    }
    rv = sslBuffer_AppendNumber(messageBuf, version, 2);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (helloRetry) {
        random = ssl_hello_retry_random;
    } else {
        rv = ssl_GenerateServerRandom(ss);
        if (rv != SECSuccess) {
            return SECFailure;
        }
        random = ss->ssl3.hs.server_random;
    }
    rv = sslBuffer_Append(messageBuf, random, SSL3_RANDOM_LENGTH);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
        if (sid) {
            rv = sslBuffer_AppendVariable(messageBuf, sid->u.ssl3.sessionID,
                                          sid->u.ssl3.sessionIDLength, 1);
        } else {
            rv = sslBuffer_AppendNumber(messageBuf, 0, 1);
        }
    } else {
        rv = sslBuffer_AppendVariable(messageBuf, ss->ssl3.hs.fakeSid.data,
                                      ss->ssl3.hs.fakeSid.len, 1);
    }
    if (rv != SECSuccess) {
        return SECFailure;
    }

    rv = sslBuffer_AppendNumber(messageBuf, ss->ssl3.hs.cipher_suite, 2);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    rv = sslBuffer_AppendNumber(messageBuf, ssl_compression_null, 1);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    if (SSL_BUFFER_LEN(extensionBuf)) {
        /* Directly copy the extensions */
        rv = sslBuffer_AppendBufferVariable(messageBuf, extensionBuf, 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

    if (ss->xtnData.ech && ss->xtnData.ech->receivedInnerXtn) {
        /* Signal ECH acceptance if we handled handled both CHOuter/CHInner (i.e.
         * in shared mode), or if we received a CHInner in split/backend mode. */
        if (ss->ssl3.hs.echAccepted || ss->opt.enableTls13BackendEch) {
            if (helloRetry) {
                return tls13_WriteServerEchHrrSignal(ss, SSL_BUFFER_BASE(messageBuf),
                                                     SSL_BUFFER_LEN(messageBuf));
            } else {
                return tls13_WriteServerEchSignal(ss, SSL_BUFFER_BASE(messageBuf),
                                                  SSL_BUFFER_LEN(messageBuf));
            }
        }
    }
    return SECSuccess;
}

/* The negotiated version number has been already placed in ss->version.
**
** Called from:  ssl3_HandleClientHello                     (resuming session),
**  ssl3_SendServerHelloSequence <- ssl3_HandleClientHello   (new session),
**  ssl3_SendServerHelloSequence <- ssl3_HandleV2ClientHello (new session)
*/
SECStatus
ssl3_SendServerHello(sslSocket *ss)
{
    SECStatus rv;
    sslBuffer extensionBuf = SSL_BUFFER_EMPTY;
    sslBuffer messageBuf = SSL_BUFFER_EMPTY;

    SSL_TRC(3, ("%d: SSL3[%d]: send server_hello handshake", SSL_GETPID(),
                ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    PORT_Assert(MSB(ss->version) == MSB(SSL_LIBRARY_VERSION_3_0));
    if (MSB(ss->version) != MSB(SSL_LIBRARY_VERSION_3_0)) {
        PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
        return SECFailure;
    }

    rv = ssl_ConstructExtensions(ss, &extensionBuf, ssl_hs_server_hello);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = ssl_ConstructServerHello(ss, PR_FALSE, &extensionBuf, &messageBuf);
    if (rv != SECSuccess) {
        goto loser;
    }

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_server_hello,
                                    SSL_BUFFER_LEN(&messageBuf));
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    rv = ssl3_AppendHandshake(ss, SSL_BUFFER_BASE(&messageBuf),
                              SSL_BUFFER_LEN(&messageBuf));
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
        rv = ssl3_SetupBothPendingCipherSpecs(ss);
        if (rv != SECSuccess) {
            goto loser; /* err set */
        }
    }

    sslBuffer_Clear(&extensionBuf);
    sslBuffer_Clear(&messageBuf);
    return SECSuccess;

loser:
    sslBuffer_Clear(&extensionBuf);
    sslBuffer_Clear(&messageBuf);
    return SECFailure;
}

SECStatus
ssl_CreateDHEKeyPair(const sslNamedGroupDef *groupDef,
                     const ssl3DHParams *params,
                     sslEphemeralKeyPair **keyPair)
{
    SECKEYDHParams dhParam;
    SECKEYPublicKey *pubKey = NULL;   /* Ephemeral DH key */
    SECKEYPrivateKey *privKey = NULL; /* Ephemeral DH key */
    sslEphemeralKeyPair *pair;

    dhParam.prime.data = params->prime.data;
    dhParam.prime.len = params->prime.len;
    dhParam.base.data = params->base.data;
    dhParam.base.len = params->base.len;

    PRINT_BUF(60, (NULL, "Server DH p", dhParam.prime.data,
                   dhParam.prime.len));
    PRINT_BUF(60, (NULL, "Server DH g", dhParam.base.data,
                   dhParam.base.len));

    /* Generate ephemeral DH keypair */
    privKey = SECKEY_CreateDHPrivateKey(&dhParam, &pubKey, NULL);
    if (!privKey || !pubKey) {
        ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
        return SECFailure;
    }

    pair = ssl_NewEphemeralKeyPair(groupDef, privKey, pubKey);
    if (!pair) {
        SECKEY_DestroyPrivateKey(privKey);
        SECKEY_DestroyPublicKey(pubKey);

        return SECFailure;
    }

    *keyPair = pair;
    return SECSuccess;
}

static SECStatus
ssl3_SendDHServerKeyExchange(sslSocket *ss)
{
    const ssl3KEADef *kea_def = ss->ssl3.hs.kea_def;
    SECStatus rv = SECFailure;
    int length;
    SECItem signed_hash = { siBuffer, NULL, 0 };
    SSL3Hashes hashes;
    SSLHashType hashAlg;

    const ssl3DHParams *params;
    sslEphemeralKeyPair *keyPair;
    SECKEYPublicKey *pubKey;
    SECKEYPrivateKey *certPrivateKey;
    const sslNamedGroupDef *groupDef;
    /* Do this on the heap, this could be over 2k long. */
    sslBuffer dhBuf = SSL_BUFFER_EMPTY;

    if (kea_def->kea != kea_dhe_dss && kea_def->kea != kea_dhe_rsa) {
        /* TODO: Support DH_anon. It might be sufficient to drop the signature.
                 See bug 1170510. */
        PORT_SetError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
        return SECFailure;
    }

    rv = ssl_SelectDHEGroup(ss, &groupDef);
    if (rv == SECFailure) {
        PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
        return SECFailure;
    }
    ss->sec.keaGroup = groupDef;

    params = ssl_GetDHEParams(groupDef);
    rv = ssl_CreateDHEKeyPair(groupDef, params, &keyPair);
    if (rv == SECFailure) {
        ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
        return SECFailure;
    }
    PR_APPEND_LINK(&keyPair->link, &ss->ephemeralKeyPairs);

    if (ss->version == SSL_LIBRARY_VERSION_TLS_1_2) {
        hashAlg = ssl_SignatureSchemeToHashType(ss->ssl3.hs.signatureScheme);
    } else {
        /* Use ssl_hash_none to represent the MD5+SHA1 combo. */
        hashAlg = ssl_hash_none;
    }

    pubKey = keyPair->keys->pubKey;
    PRINT_BUF(50, (ss, "DH public value:",
                   pubKey->u.dh.publicValue.data,
                   pubKey->u.dh.publicValue.len));
    rv = ssl3_ComputeDHKeyHash(ss, hashAlg, &hashes,
                               pubKey->u.dh.prime,
                               pubKey->u.dh.base,
                               pubKey->u.dh.publicValue,
                               PR_TRUE /* padY */);
    if (rv != SECSuccess) {
        ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
        goto loser;
    }

    certPrivateKey = ss->sec.serverCert->serverKeyPair->privKey;
    rv = ssl3_SignHashes(ss, &hashes, certPrivateKey, &signed_hash);
    if (rv != SECSuccess) {
        goto loser; /* ssl3_SignHashes has set err. */
    }

    length = 2 + pubKey->u.dh.prime.len +
             2 + pubKey->u.dh.base.len +
             2 + pubKey->u.dh.prime.len +
             2 + signed_hash.len;

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        length += 2;
    }

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_server_key_exchange, length);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.dh.prime.data,
                                      pubKey->u.dh.prime.len, 2);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.dh.base.data,
                                      pubKey->u.dh.base.len, 2);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    rv = ssl_AppendPaddedDHKeyShare(&dhBuf, pubKey, PR_TRUE);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendPaddedDHKeyShare. */
    }
    rv = ssl3_AppendBufferToHandshake(ss, &dhBuf);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.signatureScheme, 2);
        if (rv != SECSuccess) {
            goto loser; /* err set by AppendHandshake. */
        }
    }

    rv = ssl3_AppendHandshakeVariable(ss, signed_hash.data,
                                      signed_hash.len, 2);
    if (rv != SECSuccess) {
        goto loser; /* err set by AppendHandshake. */
    }

    sslBuffer_Clear(&dhBuf);
    PORT_Free(signed_hash.data);
    return SECSuccess;

loser:
    if (signed_hash.data)
        PORT_Free(signed_hash.data);
    sslBuffer_Clear(&dhBuf);
    return SECFailure;
}

static SECStatus
ssl3_SendServerKeyExchange(sslSocket *ss)
{
    const ssl3KEADef *kea_def = ss->ssl3.hs.kea_def;

    SSL_TRC(3, ("%d: SSL3[%d]: send server_key_exchange handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    switch (kea_def->exchKeyType) {
        case ssl_kea_dh: {
            return ssl3_SendDHServerKeyExchange(ss);
        }

        case ssl_kea_ecdh: {
            return ssl3_SendECDHServerKeyExchange(ss);
        }

        case ssl_kea_rsa:
        case ssl_kea_null:
        default:
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            break;
    }

    return SECFailure;
}

SECStatus
ssl3_EncodeSigAlgs(const sslSocket *ss, PRUint16 minVersion, PRBool forCert,
                   PRBool grease, sslBuffer *buf)
{
    SSLSignatureScheme filtered[MAX_SIGNATURE_SCHEMES] = { 0 };
    unsigned int filteredCount = 0;

    SECStatus rv = ssl3_FilterSigAlgs(ss, minVersion, PR_FALSE, forCert,
                                      PR_ARRAY_SIZE(filtered),
                                      filtered, &filteredCount);
    if (rv != SECSuccess) {
        return SECFailure;
    }
    return ssl3_EncodeFilteredSigAlgs(ss, filtered, filteredCount, grease, buf);
}

SECStatus
ssl3_EncodeFilteredSigAlgs(const sslSocket *ss, const SSLSignatureScheme *schemes,
                           PRUint32 numSchemes, PRBool grease, sslBuffer *buf)
{
    if (!numSchemes) {
        PORT_SetError(SSL_ERROR_NO_SUPPORTED_SIGNATURE_ALGORITHM);
        return SECFailure;
    }

    unsigned int lengthOffset;
    SECStatus rv;

    rv = sslBuffer_Skip(buf, 2, &lengthOffset);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    for (unsigned int i = 0; i < numSchemes; ++i) {
        rv = sslBuffer_AppendNumber(buf, schemes[i], 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

    /* GREASE SignatureAlgorithms:
     * A client MAY select one or more GREASE signature algorithm values and
     * advertise them in the "signature_algorithms" or
     * "signature_algorithms_cert" extensions, if sent [RFC8701, Section 3.1].
     *
     * When sending a CertificateRequest in TLS 1.3, a server MAY behave as
     * follows: [...] A server MAY select one or more GREASE signature
     * algorithm values and advertise them in the "signature_algorithms" or
     * "signature_algorithms_cert" extensions, if present
     * [RFC8701, Section 4.1]. */
    if (grease &&
        ((!ss->sec.isServer && ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3) ||
         (ss->sec.isServer && ss->version >= SSL_LIBRARY_VERSION_TLS_1_3))) {
        PRUint16 value;
        if (ss->sec.isServer) {
            rv = tls13_RandomGreaseValue(&value);
            if (rv != SECSuccess) {
                return SECFailure;
            }
        } else {
            value = ss->ssl3.hs.grease->idx[grease_sigalg];
        }
        rv = sslBuffer_AppendNumber(buf, value, 2);
        if (rv != SECSuccess) {
            return SECFailure;
        }
    }

    return sslBuffer_InsertLength(buf, lengthOffset, 2);
}

/*
 * In TLS 1.3 we are permitted to advertise support for PKCS#1
 * schemes. This doesn't affect the signatures in TLS itself, just
 * those on certificates. Not advertising PKCS#1 signatures creates a
 * serious compatibility risk as it excludes many certificate chains
 * that include PKCS#1. Hence, forCert is used to enable advertising
 * PKCS#1 support. Note that we include these in signature_algorithms
 * because we don't yet support signature_algorithms_cert. TLS 1.3
 * requires that PKCS#1 schemes are placed last in the list if they
 * are present. This sorting can be removed once we support
 * signature_algorithms_cert.
 */
SECStatus
ssl3_FilterSigAlgs(const sslSocket *ss, PRUint16 minVersion, PRBool disableRsae,
                   PRBool forCert,
                   unsigned int maxSchemes, SSLSignatureScheme *filteredSchemes,
                   unsigned int *numFilteredSchemes)
{
    PORT_Assert(filteredSchemes);
    PORT_Assert(numFilteredSchemes);
    PORT_Assert(maxSchemes >= ss->ssl3.signatureSchemeCount);
    if (maxSchemes < ss->ssl3.signatureSchemeCount) {
        return SECFailure;
    }

    *numFilteredSchemes = 0;
    PRBool allowUnsortedPkcs1 = forCert && minVersion < SSL_LIBRARY_VERSION_TLS_1_3;
    for (unsigned int i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        if (disableRsae && ssl_IsRsaeSignatureScheme(ss->ssl3.signatureSchemes[i])) {
            continue;
        }
        if (ssl_SignatureSchemeAccepted(minVersion,
                                        ss->ssl3.signatureSchemes[i],
                                        allowUnsortedPkcs1)) {
            filteredSchemes[(*numFilteredSchemes)++] = ss->ssl3.signatureSchemes[i];
        }
    }
    if (forCert && !allowUnsortedPkcs1) {
        for (unsigned int i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
            if (disableRsae && ssl_IsRsaeSignatureScheme(ss->ssl3.signatureSchemes[i])) {
                continue;
            }
            if (!ssl_SignatureSchemeAccepted(minVersion,
                                             ss->ssl3.signatureSchemes[i],
                                             PR_FALSE) &&
                ssl_SignatureSchemeAccepted(minVersion,
                                            ss->ssl3.signatureSchemes[i],
                                            PR_TRUE)) {
                filteredSchemes[(*numFilteredSchemes)++] = ss->ssl3.signatureSchemes[i];
            }
        }
    }
    return SECSuccess;
}

static SECStatus
ssl3_SendCertificateRequest(sslSocket *ss)
{
    PRBool isTLS12;
    const PRUint8 *certTypes;
    SECStatus rv;
    PRUint32 length;
    const SECItem *names;
    unsigned int calen;
    unsigned int nnames;
    const SECItem *name;
    unsigned int i;
    int certTypesLength;
    PRUint8 sigAlgs[2 + MAX_SIGNATURE_SCHEMES * 2];
    sslBuffer sigAlgsBuf = SSL_BUFFER(sigAlgs);

    SSL_TRC(3, ("%d: SSL3[%d]: send certificate_request handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    isTLS12 = (PRBool)(ss->version >= SSL_LIBRARY_VERSION_TLS_1_2);

    rv = ssl_GetCertificateRequestCAs(ss, &calen, &names, &nnames);
    if (rv != SECSuccess) {
        return rv;
    }
    certTypes = certificate_types;
    certTypesLength = sizeof certificate_types;

    length = 1 + certTypesLength + 2 + calen;
    if (isTLS12) {
        rv = ssl3_EncodeSigAlgs(ss, ss->version, PR_TRUE /* forCert */,
                                PR_FALSE /* GREASE */, &sigAlgsBuf);
        if (rv != SECSuccess) {
            return rv;
        }
        length += SSL_BUFFER_LEN(&sigAlgsBuf);
    }

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate_request, length);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    rv = ssl3_AppendHandshakeVariable(ss, certTypes, certTypesLength, 1);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    if (isTLS12) {
        rv = ssl3_AppendHandshake(ss, SSL_BUFFER_BASE(&sigAlgsBuf),
                                  SSL_BUFFER_LEN(&sigAlgsBuf));
        if (rv != SECSuccess) {
            return rv; /* err set by AppendHandshake. */
        }
    }
    rv = ssl3_AppendHandshakeNumber(ss, calen, 2);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    for (i = 0, name = names; i < nnames; i++, name++) {
        rv = ssl3_AppendHandshakeVariable(ss, name->data, name->len, 2);
        if (rv != SECSuccess) {
            return rv; /* err set by AppendHandshake. */
        }
    }

    return SECSuccess;
}

static SECStatus
ssl3_SendServerHelloDone(sslSocket *ss)
{
    SECStatus rv;

    SSL_TRC(3, ("%d: SSL3[%d]: send server_hello_done handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_server_hello_done, 0);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    rv = ssl3_FlushHandshake(ss, 0);
    if (rv != SECSuccess) {
        return rv; /* error code set by ssl3_FlushHandshake */
    }
    return SECSuccess;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 Certificate Verify message
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleCertificateVerify(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECItem signed_hash = { siBuffer, NULL, 0 };
    SECStatus rv;
    int errCode = SSL_ERROR_RX_MALFORMED_CERT_VERIFY;
    SSL3AlertDescription desc = handshake_failure;
    PRBool isTLS;
    SSLSignatureScheme sigScheme;
    SSL3Hashes hashes;
    const PRUint8 *savedMsg = b;
    const PRUint32 savedLen = length;

    SSL_TRC(3, ("%d: SSL3[%d]: handle certificate_verify handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->ssl3.hs.ws != wait_cert_verify) {
        desc = unexpected_message;
        errCode = SSL_ERROR_RX_UNEXPECTED_CERT_VERIFY;
        goto alert_loser;
    }

    /* TLS 1.3 is handled by tls13_HandleCertificateVerify */
    PORT_Assert(ss->ssl3.prSpec->version <= SSL_LIBRARY_VERSION_TLS_1_2);

    if (ss->ssl3.prSpec->version == SSL_LIBRARY_VERSION_TLS_1_2) {
        PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_record);
        rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme);
        if (rv != SECSuccess) {
            if (PORT_GetError() == SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM) {
                errCode = SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM;
            }
            goto loser; /* alert already sent */
        }
        rv = ssl_CheckSignatureSchemeConsistency(
            ss, sigScheme, &ss->sec.peerCert->subjectPublicKeyInfo);
        if (rv != SECSuccess) {
            errCode = PORT_GetError();
            desc = illegal_parameter;
            goto alert_loser;
        }

        rv = ssl3_ComputeHandshakeHash(ss->ssl3.hs.messages.buf,
                                       ss->ssl3.hs.messages.len,
                                       ssl_SignatureSchemeToHashType(sigScheme),
                                       &hashes);
    } else {
        PORT_Assert(ss->ssl3.hs.hashType != handshake_hash_record);
        sigScheme = ssl_sig_none;
        rv = ssl3_ComputeHandshakeHashes(ss, ss->ssl3.prSpec, &hashes, 0);
    }

    if (rv != SECSuccess) {
        errCode = SSL_ERROR_DIGEST_FAILURE;
        desc = decrypt_error;
        goto alert_loser;
    }

    rv = ssl3_ConsumeHandshakeVariable(ss, &signed_hash, 2, &b, &length);
    if (rv != SECSuccess) {
        goto loser; /* malformed. */
    }

    isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);

    /* XXX verify that the key & kea match */
    rv = ssl3_VerifySignedHashes(ss, sigScheme, &hashes, &signed_hash);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        desc = isTLS ? decrypt_error : handshake_failure;
        goto alert_loser;
    }

    signed_hash.data = NULL;

    if (length != 0) {
        desc = isTLS ? decode_error : illegal_parameter;
        goto alert_loser; /* malformed */
    }

    rv = ssl_HashHandshakeMessage(ss, ssl_hs_certificate_verify,
                                  savedMsg, savedLen);
    if (rv != SECSuccess) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return rv;
    }

    ss->ssl3.hs.ws = wait_change_cipher;
    return SECSuccess;

alert_loser:
    SSL3_SendAlert(ss, alert_fatal, desc);
loser:
    PORT_SetError(errCode);
    return SECFailure;
}

/* find a slot that is able to generate a PMS and wrap it with RSA.
 * Then generate and return the PMS.
 * If the serverKeySlot parameter is non-null, this function will use
 * that slot to do the job, otherwise it will find a slot.
 *
 * Called from  ssl3_DeriveConnectionKeys()  (above)
 *      ssl3_SendRSAClientKeyExchange()     (above)
 *      ssl3_HandleRSAClientKeyExchange()  (below)
 * Caller must hold the SpecWriteLock, the SSL3HandshakeLock
 */
static PK11SymKey *
ssl3_GenerateRSAPMS(sslSocket *ss, ssl3CipherSpec *spec,
                    PK11SlotInfo *serverKeySlot)
{
    PK11SymKey *pms = NULL;
    PK11SlotInfo *slot = serverKeySlot;
    void *pwArg = ss->pkcs11PinArg;
    SECItem param;
    CK_VERSION version;
    CK_MECHANISM_TYPE mechanism_array[3];

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (slot == NULL) {
        SSLCipherAlgorithm calg;
        /* The specReadLock would suffice here, but we cannot assert on
        ** read locks.  Also, all the callers who call with a non-null
        ** slot already hold the SpecWriteLock.
        */
        PORT_Assert(ss->opt.noLocks || ssl_HaveSpecWriteLock(ss));
        PORT_Assert(ss->ssl3.prSpec->epoch == ss->ssl3.pwSpec->epoch);

        calg = spec->cipherDef->calg;

        /* First get an appropriate slot.  */
        mechanism_array[0] = CKM_SSL3_PRE_MASTER_KEY_GEN;
        mechanism_array[1] = CKM_RSA_PKCS;
        mechanism_array[2] = ssl3_Alg2Mech(calg);

        slot = PK11_GetBestSlotMultiple(mechanism_array, 3, pwArg);
        if (slot == NULL) {
            /* can't find a slot with all three, find a slot with the minimum */
            slot = PK11_GetBestSlotMultiple(mechanism_array, 2, pwArg);
            if (slot == NULL) {
                PORT_SetError(SSL_ERROR_TOKEN_SLOT_NOT_FOUND);
                return pms; /* which is NULL */
            }
        }
    }

    /* Generate the pre-master secret ...  */
    if (IS_DTLS(ss)) {
        SSL3ProtocolVersion temp;

        temp = dtls_TLSVersionToDTLSVersion(ss->clientHelloVersion);
        version.major = MSB(temp);
        version.minor = LSB(temp);
    } else {
        version.major = MSB(ss->clientHelloVersion);
        version.minor = LSB(ss->clientHelloVersion);
    }

    param.data = (unsigned char *)&version;
    param.len = sizeof version;

    pms = PK11_KeyGen(slot, CKM_SSL3_PRE_MASTER_KEY_GEN, &param, 0, pwArg);
    if (!serverKeySlot)
        PK11_FreeSlot(slot);
    if (pms == NULL) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
    }
    return pms;
}

static void
ssl3_CSwapPK11SymKey(PK11SymKey **x, PK11SymKey **y, PRBool c)
{
    uintptr_t mask = (uintptr_t)c;
    unsigned int i;
    for (i = 1; i < sizeof(uintptr_t) * 8; i <<= 1) {
        mask |= mask << i;
    }
    uintptr_t x_ptr = (uintptr_t)*x;
    uintptr_t y_ptr = (uintptr_t)*y;
    uintptr_t tmp = (x_ptr ^ y_ptr) & mask;
    x_ptr = x_ptr ^ tmp;
    y_ptr = y_ptr ^ tmp;
    *x = (PK11SymKey *)x_ptr;
    *y = (PK11SymKey *)y_ptr;
}

/* Note: The Bleichenbacher attack on PKCS#1 necessitates that we NEVER
 * return any indication of failure of the Client Key Exchange message,
 * where that failure is caused by the content of the client's message.
 * This function must not return SECFailure for any reason that is directly
 * or indirectly caused by the content of the client's encrypted PMS.
 * We must not send an alert and also not drop the connection.
 * Instead, we generate a random PMS.  This will cause a failure
 * in the processing the finished message, which is exactly where
 * the failure must occur.
 *
 * Called from ssl3_HandleClientKeyExchange
 */
static SECStatus
ssl3_HandleRSAClientKeyExchange(sslSocket *ss,
                                PRUint8 *b,
                                PRUint32 length,
                                sslKeyPair *serverKeyPair)
{
    SECStatus rv;
    SECItem enc_pms;
    PK11SymKey *pms = NULL;
    PK11SymKey *fauxPms = NULL;
    PK11SlotInfo *slot = NULL;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->ssl3.prSpec->epoch == ss->ssl3.pwSpec->epoch);

    enc_pms.data = b;
    enc_pms.len = length;

    if (ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0) { /* isTLS */
        PRUint32 kLen;
        rv = ssl3_ConsumeHandshakeNumber(ss, &kLen, 2, &enc_pms.data, &enc_pms.len);
        if (rv != SECSuccess) {
            PORT_SetError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
            return SECFailure;
        }
        if ((unsigned)kLen < enc_pms.len) {
            enc_pms.len = kLen;
        }
    }

    /*
     * Get as close to algorithm 2 from RFC 5246; Section 7.4.7.1
     * as we can within the constraints of the PKCS#11 interface.
     *
     * 1. Unconditionally generate a bogus PMS (what RFC 5246
     *    calls R).
     * 2. Attempt the RSA decryption to recover the PMS (what
     *    RFC 5246 calls M).
     * 3. Set PMS = (M == NULL) ? R : M
     * 4. Use ssl3_ComputeMasterSecret(PMS) to attempt to derive
     *    the MS from PMS. This includes performing the version
     *    check and length check.
     * 5. If either the initial RSA decryption failed or
     *    ssl3_ComputeMasterSecret(PMS) failed, then discard
     *    M and set PMS = R. Else, discard R and set PMS = M.
     *
     * We do two derivations here because we can't rely on having
     * a function that only performs the PMS version and length
     * check. The only redundant cost is that this runs the PRF,
     * which isn't necessary here.
     */

    /* Generate the bogus PMS (R) */
    slot = PK11_GetSlotFromPrivateKey(serverKeyPair->privKey);
    if (!slot) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    if (!PK11_DoesMechanism(slot, CKM_SSL3_MASTER_KEY_DERIVE)) {
        PK11_FreeSlot(slot);
        slot = PK11_GetBestSlot(CKM_SSL3_MASTER_KEY_DERIVE, NULL);
        if (!slot) {
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }
    }

    ssl_GetSpecWriteLock(ss);
    fauxPms = ssl3_GenerateRSAPMS(ss, ss->ssl3.prSpec, slot);
    ssl_ReleaseSpecWriteLock(ss);
    PK11_FreeSlot(slot);

    if (fauxPms == NULL) {
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        return SECFailure;
    }

    /*
     * unwrap pms out of the incoming buffer
     * Note: CKM_SSL3_MASTER_KEY_DERIVE is NOT the mechanism used to do
     *  the unwrap.  Rather, it is the mechanism with which the
     *      unwrapped pms will be used.
     */
    pms = PK11_PubUnwrapSymKey(serverKeyPair->privKey, &enc_pms,
                               CKM_SSL3_MASTER_KEY_DERIVE, CKA_DERIVE, 0);
    /* Temporarily use the PMS if unwrapping the real PMS fails. */
    ssl3_CSwapPK11SymKey(&pms, &fauxPms, pms == NULL);

    /* Attempt to derive the MS from the PMS. This is the only way to
     * check the version field in the RSA PMS. If this fails, we
     * then use the faux PMS in place of the PMS. Note that this
     * operation should never fail if we are using the faux PMS
     * since it is correctly formatted. */
    rv = ssl3_ComputeMasterSecret(ss, pms, NULL);

    /* If we succeeded, then select the true PMS, else select the FPMS. */
    ssl3_CSwapPK11SymKey(&pms, &fauxPms, (rv != SECSuccess) & (fauxPms != NULL));

    /* This step will derive the MS from the PMS, among other things. */
    rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);

    /* Clear both PMS. */
    PK11_FreeSymKey(pms);
    PK11_FreeSymKey(fauxPms);

    if (rv != SECSuccess) {
        (void)SSL3_SendAlert(ss, alert_fatal, handshake_failure);
        return SECFailure; /* error code set by ssl3_InitPendingCipherSpec */
    }

    return SECSuccess;
}

static SECStatus
ssl3_HandleDHClientKeyExchange(sslSocket *ss,
                               PRUint8 *b,
                               PRUint32 length,
                               sslKeyPair *serverKeyPair)
{
    PK11SymKey *pms;
    SECStatus rv;
    SECKEYPublicKey clntPubKey;
    CK_MECHANISM_TYPE target;
    PRBool isTLS;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    clntPubKey.keyType = dhKey;
    clntPubKey.u.dh.prime.len = serverKeyPair->pubKey->u.dh.prime.len;
    clntPubKey.u.dh.prime.data = serverKeyPair->pubKey->u.dh.prime.data;
    clntPubKey.u.dh.base.len = serverKeyPair->pubKey->u.dh.base.len;
    clntPubKey.u.dh.base.data = serverKeyPair->pubKey->u.dh.base.data;

    rv = ssl3_ConsumeHandshakeVariable(ss, &clntPubKey.u.dh.publicValue,
                                       2, &b, &length);
    if (rv != SECSuccess) {
        return SECFailure;
    }

    if (!ssl_IsValidDHEShare(&serverKeyPair->pubKey->u.dh.prime,
                             &clntPubKey.u.dh.publicValue)) {
        PORT_SetError(SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE);
        return SECFailure;
    }

    isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);

    if (isTLS)
        target = CKM_TLS_MASTER_KEY_DERIVE_DH;
    else
        target = CKM_SSL3_MASTER_KEY_DERIVE_DH;

    /* Determine the PMS */
    pms = PK11_PubDerive(serverKeyPair->privKey, &clntPubKey, PR_FALSE, NULL, NULL,
                         CKM_DH_PKCS_DERIVE, target, CKA_DERIVE, 0, NULL);
    if (pms == NULL) {
        ssl_FreeEphemeralKeyPairs(ss);
        ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
        return SECFailure;
    }

    rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);
    PK11_FreeSymKey(pms);
    ssl_FreeEphemeralKeyPairs(ss);
    return rv;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 ClientKeyExchange message from the remote client
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleClientKeyExchange(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    sslKeyPair *serverKeyPair = NULL;
    SECStatus rv;
    const ssl3KEADef *kea_def;

    SSL_TRC(3, ("%d: SSL3[%d]: handle client_key_exchange handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (ss->ssl3.hs.ws != wait_client_key) {
        SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CLIENT_KEY_EXCH);
        return SECFailure;
    }

    kea_def = ss->ssl3.hs.kea_def;

    if (kea_def->ephemeral) {
        sslEphemeralKeyPair *keyPair;
        /* There should be exactly one pair. */
        PORT_Assert(!PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs));
        PORT_Assert(PR_PREV_LINK(&ss->ephemeralKeyPairs) ==
                    PR_NEXT_LINK(&ss->ephemeralKeyPairs));
        keyPair = (sslEphemeralKeyPair *)PR_NEXT_LINK(&ss->ephemeralKeyPairs);
        serverKeyPair = keyPair->keys;
        ss->sec.keaKeyBits =
            SECKEY_PublicKeyStrengthInBits(serverKeyPair->pubKey);
    } else {
        serverKeyPair = ss->sec.serverCert->serverKeyPair;
        ss->sec.keaKeyBits = ss->sec.serverCert->serverKeyBits;
    }

    if (!serverKeyPair) {
        SSL3_SendAlert(ss, alert_fatal, handshake_failure);
        PORT_SetError(SSL_ERROR_NO_SERVER_KEY_FOR_ALG);
        return SECFailure;
    }
    PORT_Assert(serverKeyPair->pubKey);
    PORT_Assert(serverKeyPair->privKey);

    ss->sec.keaType = kea_def->exchKeyType;

    switch (kea_def->exchKeyType) {
        case ssl_kea_rsa:
            rv = ssl3_HandleRSAClientKeyExchange(ss, b, length, serverKeyPair);
            break;

        case ssl_kea_dh:
            rv = ssl3_HandleDHClientKeyExchange(ss, b, length, serverKeyPair);
            break;

        case ssl_kea_ecdh:
            rv = ssl3_HandleECDHClientKeyExchange(ss, b, length, serverKeyPair);
            break;

        default:
            (void)ssl3_HandshakeFailure(ss);
            PORT_SetError(SEC_ERROR_UNSUPPORTED_KEYALG);
            return SECFailure;
    }
    ssl_FreeEphemeralKeyPairs(ss);
    if (rv == SECSuccess) {
        ss->ssl3.hs.ws = ss->sec.peerCert ? wait_cert_verify : wait_change_cipher;
    } else {
        /* PORT_SetError has been called by all the Handle*ClientKeyExchange
         * functions above.  However, not all error paths result in an alert, so
         * this ensures that the server knows about the error.  Note that if an
         * alert was already sent, SSL3_SendAlert() is a noop. */
        PRErrorCode errCode = PORT_GetError();
        (void)SSL3_SendAlert(ss, alert_fatal, handshake_failure);
        PORT_SetError(errCode);
    }
    return rv;
}

/* This is TLS's equivalent of sending a no_certificate alert. */
SECStatus
ssl3_SendEmptyCertificate(sslSocket *ss)
{
    SECStatus rv;
    unsigned int len = 0;
    PRBool isTLS13 = PR_FALSE;
    const SECItem *context;

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        PORT_Assert(ss->ssl3.hs.clientCertRequested);
        context = &ss->xtnData.certReqContext;
        len = context->len + 1;
        isTLS13 = PR_TRUE;
    }

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate, len + 3);
    if (rv != SECSuccess) {
        return rv;
    }

    if (isTLS13) {
        rv = ssl3_AppendHandshakeVariable(ss, context->data, context->len, 1);
        if (rv != SECSuccess) {
            return rv;
        }
    }

    return ssl3_AppendHandshakeNumber(ss, 0, 3);
}

/*
 * NewSessionTicket
 * Called from ssl3_HandleFinished
 */
static SECStatus
ssl3_SendNewSessionTicket(sslSocket *ss)
{
    SECItem ticket = { 0, NULL, 0 };
    SECStatus rv;
    NewSessionTicket nticket = { 0 };

    rv = ssl3_EncodeSessionTicket(ss, &nticket, NULL, 0,
                                  ss->ssl3.pwSpec->masterSecret, &ticket);
    if (rv != SECSuccess)
        goto loser;

    /* Serialize the handshake message. Length =
     * lifetime (4) + ticket length (2) + ticket. */
    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_new_session_ticket,
                                    4 + 2 + ticket.len);
    if (rv != SECSuccess)
        goto loser;

    /* This is a fixed value. */
    rv = ssl3_AppendHandshakeNumber(ss, ssl_ticket_lifetime, 4);
    if (rv != SECSuccess)
        goto loser;

    /* Encode the ticket. */
    rv = ssl3_AppendHandshakeVariable(ss, ticket.data, ticket.len, 2);
    if (rv != SECSuccess)
        goto loser;

    rv = SECSuccess;

loser:
    if (ticket.data) {
        SECITEM_FreeItem(&ticket, PR_FALSE);
    }
    return rv;
}

static SECStatus
ssl3_HandleNewSessionTicket(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECStatus rv;
    SECItem ticketData;
    PRUint32 temp;

    SSL_TRC(3, ("%d: SSL3[%d]: handle session_ticket handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    PORT_Assert(!ss->ssl3.hs.newSessionTicket.ticket.data);
    PORT_Assert(!ss->ssl3.hs.receivedNewSessionTicket);

    if (ss->ssl3.hs.ws != wait_new_session_ticket) {
        SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET);
        return SECFailure;
    }

    /* RFC5077 Section 3.3: "The client MUST NOT treat the ticket as valid
     * until it has verified the server's Finished message." See the comment in
     * ssl3_FinishHandshake for more details.
     */
    ss->ssl3.hs.newSessionTicket.received_timestamp = ssl_Time(ss);
    if (length < 4) {
        (void)SSL3_SendAlert(ss, alert_fatal, decode_error);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET);
        return SECFailure;
    }

    rv = ssl3_ConsumeHandshakeNumber(ss, &temp, 4, &b, &length);
    if (rv != SECSuccess) {
        PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET);
        return SECFailure;
    }
    ss->ssl3.hs.newSessionTicket.ticket_lifetime_hint = temp;

    rv = ssl3_ConsumeHandshakeVariable(ss, &ticketData, 2, &b, &length);
    if (rv != SECSuccess || length != 0) {
        (void)SSL3_SendAlert(ss, alert_fatal, decode_error);
        PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET);
        return SECFailure; /* malformed */
    }
    /* If the server sent a zero-length ticket, ignore it and keep the
     * existing ticket. */
    if (ticketData.len != 0) {
        rv = SECITEM_CopyItem(NULL, &ss->ssl3.hs.newSessionTicket.ticket,
                              &ticketData);
        if (rv != SECSuccess) {
            return rv;
        }
        ss->ssl3.hs.receivedNewSessionTicket = PR_TRUE;
    }

    ss->ssl3.hs.ws = wait_change_cipher;
    return SECSuccess;
}

#ifdef NISCC_TEST
static PRInt32 connNum = 0;

static SECStatus
get_fake_cert(SECItem *pCertItem, int *pIndex)
{
    PRFileDesc *cf;
    char *testdir;
    char *startat;
    char *stopat;
    const char *extension;
    int fileNum;
    PRInt32 numBytes = 0;
    PRStatus prStatus;
    PRFileInfo info;
    char cfn[100];

    pCertItem->data = 0;
    if ((testdir = PR_GetEnvSecure("NISCC_TEST")) == NULL) {
        return SECSuccess;
    }
    *pIndex = (NULL != strstr(testdir, "root"));
    extension = (strstr(testdir, "simple") ? "" : ".der");
    fileNum = PR_ATOMIC_INCREMENT(&connNum) - 1;
    if ((startat = PR_GetEnvSecure("START_AT")) != NULL) {
        fileNum += atoi(startat);
    }
    if ((stopat = PR_GetEnvSecure("STOP_AT")) != NULL &&
        fileNum >= atoi(stopat)) {
        *pIndex = -1;
        return SECSuccess;
    }
    snprintf(cfn, sizeof(cfn), "%s/%08d%s", testdir, fileNum, extension);
    cf = PR_Open(cfn, PR_RDONLY, 0);
    if (!cf) {
        goto loser;
    }
    prStatus = PR_GetOpenFileInfo(cf, &info);
    if (prStatus != PR_SUCCESS) {
        PR_Close(cf);
        goto loser;
    }
    pCertItem = SECITEM_AllocItem(NULL, pCertItem, info.size);
    if (pCertItem) {
        numBytes = PR_Read(cf, pCertItem->data, info.size);
    }
    PR_Close(cf);
    if (numBytes != info.size) {
        SECITEM_FreeItem(pCertItem, PR_FALSE);
        PORT_SetError(SEC_ERROR_IO);
        goto loser;
    }
    fprintf(stderr, "using %s\n", cfn);
    return SECSuccess;

loser:
    fprintf(stderr, "failed to use %s\n", cfn);
    *pIndex = -1;
    return SECFailure;
}
#endif

/*
 * Used by both client and server.
 * Called from HandleServerHelloDone and from SendServerHelloSequence.
 */
static SECStatus
ssl3_SendCertificate(sslSocket *ss)
{
    SECStatus rv;
    CERTCertificateList *certChain;
    int certChainLen = 0;
    int i;
#ifdef NISCC_TEST
    SECItem fakeCert;
    int ndex = -1;
#endif
    PRBool isTLS13 = ss->version >= SSL_LIBRARY_VERSION_TLS_1_3;
    SECItem context = { siBuffer, NULL, 0 };
    unsigned int contextLen = 0;

    SSL_TRC(3, ("%d: SSL3[%d]: send certificate handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PR_ASSERT(!ss->ssl3.hs.clientCertificatePending);

    if (ss->sec.localCert)
        CERT_DestroyCertificate(ss->sec.localCert);
    if (ss->sec.isServer) {
        /* A server certificate is selected in ssl3_HandleClientHello. */
        PORT_Assert(ss->sec.serverCert);

        certChain = ss->sec.serverCert->serverCertChain;
        ss->sec.localCert = CERT_DupCertificate(ss->sec.serverCert->serverCert);
    } else {
        certChain = ss->ssl3.clientCertChain;
        ss->sec.localCert = CERT_DupCertificate(ss->ssl3.clientCertificate);
    }

#ifdef NISCC_TEST
    rv = get_fake_cert(&fakeCert, &ndex);
#endif

    if (isTLS13) {
        contextLen = 1; /* Size of the context length */
        if (!ss->sec.isServer) {
            PORT_Assert(ss->ssl3.hs.clientCertRequested);
            context = ss->xtnData.certReqContext;
            contextLen += context.len;
        }
    }
    if (certChain) {
        for (i = 0; i < certChain->len; i++) {
#ifdef NISCC_TEST
            if (fakeCert.len > 0 && i == ndex) {
                certChainLen += fakeCert.len + 3;
            } else {
                certChainLen += certChain->certs[i].len + 3;
            }
#else
            certChainLen += certChain->certs[i].len + 3;
#endif
        }
    }

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate,
                                    contextLen + certChainLen + 3);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }

    if (isTLS13) {
        rv = ssl3_AppendHandshakeVariable(ss, context.data,
                                          context.len, 1);
        if (rv != SECSuccess) {
            return rv; /* err set by AppendHandshake. */
        }
    }

    rv = ssl3_AppendHandshakeNumber(ss, certChainLen, 3);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    if (certChain) {
        for (i = 0; i < certChain->len; i++) {
#ifdef NISCC_TEST
            if (fakeCert.len > 0 && i == ndex) {
                rv = ssl3_AppendHandshakeVariable(ss, fakeCert.data,
                                                  fakeCert.len, 3);
                SECITEM_FreeItem(&fakeCert, PR_FALSE);
            } else {
                rv = ssl3_AppendHandshakeVariable(ss, certChain->certs[i].data,
                                                  certChain->certs[i].len, 3);
            }
#else
            rv = ssl3_AppendHandshakeVariable(ss, certChain->certs[i].data,
                                              certChain->certs[i].len, 3);
#endif
            if (rv != SECSuccess) {
                return rv; /* err set by AppendHandshake. */
            }
        }
    }

    return SECSuccess;
}

/*
 * Used by server only.
 * single-stapling, send only a single cert status
 */
SECStatus
ssl3_SendCertificateStatus(sslSocket *ss)
{
    SECStatus rv;
    int len = 0;
    SECItemArray *statusToSend = NULL;
    const sslServerCert *serverCert;

    SSL_TRC(3, ("%d: SSL3[%d]: send certificate status handshake",
                SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->sec.isServer);

    if (!ssl3_ExtensionNegotiated(ss, ssl_cert_status_xtn))
        return SECSuccess;

    /* Use certStatus based on the cert being used. */
    serverCert = ss->sec.serverCert;
    if (serverCert->certStatusArray && serverCert->certStatusArray->len) {
        statusToSend = serverCert->certStatusArray;
    }
    if (!statusToSend)
        return SECSuccess;

    /* Use the array's first item only (single stapling) */
    len = 1 + statusToSend->items[0].len + 3;

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_certificate_status, len);
    if (rv != SECSuccess) {
        return rv; /* err set by AppendHandshake. */
    }
    rv = ssl3_AppendHandshakeNumber(ss, 1 /*ocsp*/, 1);
    if (rv != SECSuccess)
        return rv; /* err set by AppendHandshake. */

    rv = ssl3_AppendHandshakeVariable(ss,
                                      statusToSend->items[0].data,
                                      statusToSend->items[0].len,
                                      3);
    if (rv != SECSuccess)
        return rv; /* err set by AppendHandshake. */

    return SECSuccess;
}

/* This is used to delete the CA certificates in the peer certificate chain
 * from the cert database after they've been validated.
 */
void
ssl3_CleanupPeerCerts(sslSocket *ss)
{
    PLArenaPool *arena = ss->ssl3.peerCertArena;
    ssl3CertNode *certs = (ssl3CertNode *)ss->ssl3.peerCertChain;

    for (; certs; certs = certs->next) {
        CERT_DestroyCertificate(certs->cert);
    }
    if (arena)
        PORT_FreeArena(arena, PR_FALSE);
    ss->ssl3.peerCertArena = NULL;
    ss->ssl3.peerCertChain = NULL;

    if (ss->sec.peerCert != NULL) {
        if (ss->sec.peerKey) {
            SECKEY_DestroyPublicKey(ss->sec.peerKey);
            ss->sec.peerKey = NULL;
        }
        CERT_DestroyCertificate(ss->sec.peerCert);
        ss->sec.peerCert = NULL;
    }
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 CertificateStatus message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleCertificateStatus(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECStatus rv;

    if (ss->ssl3.hs.ws != wait_certificate_status) {
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CERT_STATUS);
        return SECFailure;
    }

    rv = ssl_ReadCertificateStatus(ss, b, length);
    if (rv != SECSuccess) {
        return SECFailure; /* code already set */
    }

    return ssl3_AuthCertificate(ss);
}

SECStatus
ssl_ReadCertificateStatus(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    PRUint32 status, len;
    SECStatus rv;

    PORT_Assert(!ss->sec.isServer);

    /* Consume the CertificateStatusType enum */
    rv = ssl3_ConsumeHandshakeNumber(ss, &status, 1, &b, &length);
    if (rv != SECSuccess || status != 1 /* ocsp */) {
        return ssl3_DecodeError(ss);
    }

    rv = ssl3_ConsumeHandshakeNumber(ss, &len, 3, &b, &length);
    if (rv != SECSuccess || len != length) {
        return ssl3_DecodeError(ss);
    }

#define MAX_CERTSTATUS_LEN 0x1ffff /* 128k - 1 */
    if (length > MAX_CERTSTATUS_LEN) {
        ssl3_DecodeError(ss); /* sets error code */
        return SECFailure;
    }
#undef MAX_CERTSTATUS_LEN

    /* Array size 1, because we currently implement single-stapling only */
    SECITEM_AllocArray(NULL, &ss->sec.ci.sid->peerCertStatus, 1);
    if (!ss->sec.ci.sid->peerCertStatus.items)
        return SECFailure; /* code already set */

    ss->sec.ci.sid->peerCertStatus.items[0].data = PORT_Alloc(length);

    if (!ss->sec.ci.sid->peerCertStatus.items[0].data) {
        SECITEM_FreeArray(&ss->sec.ci.sid->peerCertStatus, PR_FALSE);
        return SECFailure; /* code already set */
    }

    PORT_Memcpy(ss->sec.ci.sid->peerCertStatus.items[0].data, b, length);
    ss->sec.ci.sid->peerCertStatus.items[0].len = length;
    ss->sec.ci.sid->peerCertStatus.items[0].type = siBuffer;
    return SECSuccess;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 Certificate message.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleCertificate(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SSL_TRC(3, ("%d: SSL3[%d]: handle certificate handshake",
                SSL_GETPID(), ss->fd));
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if ((ss->sec.isServer && ss->ssl3.hs.ws != wait_client_cert) ||
        (!ss->sec.isServer && ss->ssl3.hs.ws != wait_server_cert)) {
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CERTIFICATE);
        return SECFailure;
    }

    if (ss->sec.isServer) {
        dtls_ReceivedFirstMessageInFlight(ss);
    }

    return ssl3_CompleteHandleCertificate(ss, b, length);
}

/* Called from ssl3_HandleCertificate
 */
SECStatus
ssl3_CompleteHandleCertificate(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    ssl3CertNode *c;
    ssl3CertNode *lastCert = NULL;
    PRUint32 remaining = 0;
    PRUint32 size;
    SECStatus rv;
    PRBool isServer = ss->sec.isServer;
    PRBool isTLS;
    SSL3AlertDescription desc;
    int errCode = SSL_ERROR_RX_MALFORMED_CERTIFICATE;
    SECItem certItem;

    ssl3_CleanupPeerCerts(ss);
    isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);

    /* It is reported that some TLS client sends a Certificate message
    ** with a zero-length message body.  We'll treat that case like a
    ** normal no_certificates message to maximize interoperability.
    */
    if (length) {
        rv = ssl3_ConsumeHandshakeNumber(ss, &remaining, 3, &b, &length);
        if (rv != SECSuccess)
            goto loser; /* fatal alert already sent by ConsumeHandshake. */
        if (remaining > length)
            goto decode_loser;
    }

    if (!remaining) {
        if (!(isTLS && isServer)) {
            desc = bad_certificate;
            goto alert_loser;
        }
        /* This is TLS's version of a no_certificate alert. */
        /* I'm a server. I've requested a client cert. He hasn't got one. */
        rv = ssl3_HandleNoCertificate(ss);
        if (rv != SECSuccess) {
            errCode = PORT_GetError();
            goto loser;
        }

        if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
            ss->ssl3.hs.ws = wait_client_key;
        } else {
            TLS13_SET_HS_STATE(ss, wait_finished);
        }
        return SECSuccess;
    }

    ss->ssl3.peerCertArena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
    if (ss->ssl3.peerCertArena == NULL) {
        goto loser; /* don't send alerts on memory errors */
    }

    /* First get the peer cert. */
    if (remaining < 3)
        goto decode_loser;

    remaining -= 3;
    rv = ssl3_ConsumeHandshakeNumber(ss, &size, 3, &b, &length);
    if (rv != SECSuccess)
        goto loser; /* fatal alert already sent by ConsumeHandshake. */
    if (size == 0 || remaining < size)
        goto decode_loser;

    certItem.data = b;
    certItem.len = size;
    b += size;
    length -= size;
    remaining -= size;

    ss->sec.peerCert = CERT_NewTempCertificate(ss->dbHandle, &certItem, NULL,
                                               PR_FALSE, PR_TRUE);
    if (ss->sec.peerCert == NULL) {
        /* We should report an alert if the cert was bad, but not if the
         * problem was just some local problem, like memory error.
         */
        goto ambiguous_err;
    }

    /* Now get all of the CA certs. */
    while (remaining > 0) {
        if (remaining < 3)
            goto decode_loser;

        remaining -= 3;
        rv = ssl3_ConsumeHandshakeNumber(ss, &size, 3, &b, &length);
        if (rv != SECSuccess)
            goto loser; /* fatal alert already sent by ConsumeHandshake. */
        if (size == 0 || remaining < size)
            goto decode_loser;

        certItem.data = b;
        certItem.len = size;
        b += size;
        length -= size;
        remaining -= size;

        c = PORT_ArenaNew(ss->ssl3.peerCertArena, ssl3CertNode);
        if (c == NULL) {
            goto loser; /* don't send alerts on memory errors */
        }

        c->cert = CERT_NewTempCertificate(ss->dbHandle, &certItem, NULL,
                                          PR_FALSE, PR_TRUE);
        if (c->cert == NULL) {
            goto ambiguous_err;
        }

        c->next = NULL;
        if (lastCert) {
            lastCert->next = c;
        } else {
            ss->ssl3.peerCertChain = c;
        }
        lastCert = c;
    }

    SECKEY_UpdateCertPQG(ss->sec.peerCert);

    if (!isServer &&
        ss->version < SSL_LIBRARY_VERSION_TLS_1_3 &&
        ssl3_ExtensionNegotiated(ss, ssl_cert_status_xtn)) {
        ss->ssl3.hs.ws = wait_certificate_status;
        rv = SECSuccess;
    } else {
        rv = ssl3_AuthCertificate(ss); /* sets ss->ssl3.hs.ws */
    }

    return rv;

ambiguous_err:
    errCode = PORT_GetError();
    switch (errCode) {
        case PR_OUT_OF_MEMORY_ERROR:
        case SEC_ERROR_BAD_DATABASE:
        case SEC_ERROR_NO_MEMORY:
            if (isTLS) {
                desc = internal_error;
                goto alert_loser;
            }
            goto loser;
    }
    ssl3_SendAlertForCertError(ss, errCode);
    goto loser;

decode_loser:
    desc = isTLS ? decode_error : bad_certificate;

alert_loser:
    (void)SSL3_SendAlert(ss, alert_fatal, desc);

loser:
    (void)ssl_MapLowLevelError(errCode);
    return SECFailure;
}

SECStatus
ssl_SetAuthKeyBits(sslSocket *ss, const SECKEYPublicKey *pubKey)
{
    SECStatus rv;
    PRUint32 minKey = 0;
    PRInt32 optval;
    PRBool usePolicyLength = PR_TRUE;

    rv = NSS_OptionGet(NSS_KEY_SIZE_POLICY_FLAGS, &optval);
    if (rv == SECSuccess) {
        usePolicyLength = (PRBool)((optval & NSS_KEY_SIZE_POLICY_SSL_FLAG) == NSS_KEY_SIZE_POLICY_SSL_FLAG);
    }

    ss->sec.authKeyBits = SECKEY_PublicKeyStrengthInBits(pubKey);
    switch (SECKEY_GetPublicKeyType(pubKey)) {
        case rsaKey:
        case rsaPssKey:
        case rsaOaepKey:
            rv = usePolicyLength ? NSS_OptionGet(NSS_RSA_MIN_KEY_SIZE, &optval)
                                 : SECFailure;
            if (rv == SECSuccess && optval > 0) {
                minKey = (PRUint32)optval;
            } else {
                minKey = SSL_RSA_MIN_MODULUS_BITS;
            }
            break;

        case dsaKey:
            rv = usePolicyLength ? NSS_OptionGet(NSS_DSA_MIN_KEY_SIZE, &optval)
                                 : SECFailure;
            if (rv == SECSuccess && optval > 0) {
                minKey = (PRUint32)optval;
            } else {
                minKey = SSL_DSA_MIN_P_BITS;
            }
            break;

        case dhKey:
            rv = usePolicyLength ? NSS_OptionGet(NSS_DH_MIN_KEY_SIZE, &optval)
                                 : SECFailure;
            if (rv == SECSuccess && optval > 0) {
                minKey = (PRUint32)optval;
            } else {
                minKey = SSL_DH_MIN_P_BITS;
            }
            break;

        case ecKey:
            rv = usePolicyLength ? NSS_OptionGet(NSS_ECC_MIN_KEY_SIZE, &optval)
                                 : SECFailure;
            if (rv == SECSuccess && optval > 0) {
                minKey = (PRUint32)optval;
            } else {
                /* Don't check EC strength here on the understanding that we
                 * only support curves we like. */
                minKey = ss->sec.authKeyBits;
            }
            break;

        default:
            FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error);
            return SECFailure;
    }

    /* Too small: not good enough. Send a fatal alert. */
    if (ss->sec.authKeyBits < minKey) {
        FATAL_ERROR(ss, SSL_ERROR_WEAK_SERVER_CERT_KEY,
                    ss->version >= SSL_LIBRARY_VERSION_TLS_1_0
                        ? insufficient_security
                        : illegal_parameter);
        return SECFailure;
    }

    /* PreliminaryChannelInfo.authKeyBits, scheme, and peerDelegCred are now valid. */
    ss->ssl3.hs.preliminaryInfo |= ssl_preinfo_peer_auth;

    return SECSuccess;
}

SECStatus
ssl3_HandleServerSpki(sslSocket *ss)
{
    PORT_Assert(!ss->sec.isServer);
    SECKEYPublicKey *pubKey;

    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
        tls13_IsVerifyingWithDelegatedCredential(ss)) {
        sslDelegatedCredential *dc = ss->xtnData.peerDelegCred;
        pubKey = SECKEY_ExtractPublicKey(dc->spki);
        if (!pubKey) {
            PORT_SetError(SSL_ERROR_EXTRACT_PUBLIC_KEY_FAILURE);
            return SECFailure;
        }

        /* Because we have only a single authType (ssl_auth_tls13_any)
         * for TLS 1.3 at this point, set the scheme so that the
         * callback can interpret |authKeyBits| correctly.
         */
        ss->sec.signatureScheme = dc->expectedCertVerifyAlg;
    } else {
        pubKey = CERT_ExtractPublicKey(ss->sec.peerCert);
        if (!pubKey) {
            PORT_SetError(SSL_ERROR_EXTRACT_PUBLIC_KEY_FAILURE);
            return SECFailure;
        }
    }

    SECStatus rv = ssl_SetAuthKeyBits(ss, pubKey);
    SECKEY_DestroyPublicKey(pubKey);
    if (rv != SECSuccess) {
        return rv; /* Alert sent and code set. */
    }

    return SECSuccess;
}

SECStatus
ssl3_AuthCertificate(sslSocket *ss)
{
    SECStatus rv;
    PRBool isServer = ss->sec.isServer;
    int errCode;

    ss->ssl3.hs.authCertificatePending = PR_FALSE;

    PORT_Assert((ss->ssl3.hs.preliminaryInfo & ssl_preinfo_all) ==
                ssl_preinfo_all);

    if (!ss->sec.isServer) {
        /* Set the |spki| used to verify the handshake. When verifying with a
         * delegated credential (DC), this corresponds to the DC public key;
         * otherwise it correspond to the public key of the peer's end-entity
         * certificate. */
        rv = ssl3_HandleServerSpki(ss);
        if (rv != SECSuccess) {
            /* Alert sent and code set (if not SSL_ERROR_EXTRACT_PUBLIC_KEY_FAILURE).
             * In either case, we're done here. */
            errCode = PORT_GetError();
            goto loser;
        }

        if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
            ss->sec.authType = ss->ssl3.hs.kea_def->authKeyType;
            ss->sec.keaType = ss->ssl3.hs.kea_def->exchKeyType;
        }
    }

    /*
     * Ask caller-supplied callback function to validate cert chain.
     */
    rv = (SECStatus)(*ss->authCertificate)(ss->authCertificateArg, ss->fd,
                                           PR_TRUE, isServer);
    if (rv != SECSuccess) {
        errCode = PORT_GetError();
        if (errCode == 0) {
            errCode = SSL_ERROR_BAD_CERTIFICATE;
        }
        if (rv != SECWouldBlock) {
            if (ss->handleBadCert) {
                rv = (*ss->handleBadCert)(ss->badCertArg, ss->fd);
            }
        }

        if (rv == SECWouldBlock) {
            if (ss->sec.isServer) {
                errCode = SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_SERVERS;
                goto loser;
            }

            ss->ssl3.hs.authCertificatePending = PR_TRUE;
            rv = SECSuccess;
        }

        if (rv != SECSuccess) {
            ssl3_SendAlertForCertError(ss, errCode);
            goto loser;
        }
    }

    if (ss->sec.ci.sid->peerCert) {
        CERT_DestroyCertificate(ss->sec.ci.sid->peerCert);
    }
    ss->sec.ci.sid->peerCert = CERT_DupCertificate(ss->sec.peerCert);

    if (!ss->sec.isServer) {
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
            TLS13_SET_HS_STATE(ss, wait_cert_verify);
        } else {
            /* Ephemeral suites require ServerKeyExchange. */
            if (ss->ssl3.hs.kea_def->ephemeral) {
                /* require server_key_exchange */
                ss->ssl3.hs.ws = wait_server_key;
            } else {
                /* disallow server_key_exchange */
                ss->ssl3.hs.ws = wait_cert_request;
                /* This is static RSA key exchange so set the key exchange
                 * details to compensate for that. */
                ss->sec.keaKeyBits = ss->sec.authKeyBits;
                ss->sec.signatureScheme = ssl_sig_none;
                ss->sec.keaGroup = NULL;
            }
        }
    } else {
        /* Server */
        if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
            ss->ssl3.hs.ws = wait_client_key;
        } else {
            TLS13_SET_HS_STATE(ss, wait_cert_verify);
        }
    }

    PORT_Assert(rv == SECSuccess);
    if (rv != SECSuccess) {
        errCode = SEC_ERROR_LIBRARY_FAILURE;
        goto loser;
    }

    return SECSuccess;

loser:
    (void)ssl_MapLowLevelError(errCode);
    return SECFailure;
}

static SECStatus ssl3_FinishHandshake(sslSocket *ss);

static SECStatus
ssl3_AlwaysFail(sslSocket *ss)
{
    /* The caller should have cleared the callback. */
    ss->ssl3.hs.restartTarget = ssl3_AlwaysFail;
    PORT_SetError(PR_INVALID_STATE_ERROR);
    return SECFailure;
}

/* Caller must hold 1stHandshakeLock.
*/
SECStatus
ssl3_AuthCertificateComplete(sslSocket *ss, PRErrorCode error)
{
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_Have1stHandshakeLock(ss));

    if (ss->sec.isServer) {
        PORT_SetError(SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_SERVERS);
        return SECFailure;
    }

    ssl_GetRecvBufLock(ss);
    ssl_GetSSL3HandshakeLock(ss);

    if (!ss->ssl3.hs.authCertificatePending) {
        PORT_SetError(PR_INVALID_STATE_ERROR);
        rv = SECFailure;
        goto done;
    }

    ss->ssl3.hs.authCertificatePending = PR_FALSE;

    if (error != 0) {
        ss->ssl3.hs.restartTarget = ssl3_AlwaysFail;
        ssl3_SendAlertForCertError(ss, error);
        rv = SECSuccess;
    } else if (ss->ssl3.hs.restartTarget != NULL) {
        sslRestartTarget target = ss->ssl3.hs.restartTarget;
        ss->ssl3.hs.restartTarget = NULL;

        if (target == ssl3_FinishHandshake) {
            SSL_TRC(3, ("%d: SSL3[%p]: certificate authentication lost the race"
                        " with peer's finished message",
                        SSL_GETPID(), ss->fd));
        }

        rv = target(ss);
    } else {
        SSL_TRC(3, ("%d: SSL3[%p]: certificate authentication won the race with"
                    " peer's finished message",
                    SSL_GETPID(), ss->fd));

        PORT_Assert(!ss->ssl3.hs.isResuming);
        PORT_Assert(ss->ssl3.hs.ws != idle_handshake);

        if (ss->opt.enableFalseStart &&
            !ss->firstHsDone &&
            !ss->ssl3.hs.isResuming &&
            ssl3_WaitingForServerSecondRound(ss)) {
            /* ssl3_SendClientSecondRound deferred the false start check because
             * certificate authentication was pending, so we do it now if we still
             * haven't received all of the server's second round yet.
             */
            rv = ssl3_CheckFalseStart(ss);
        } else {
            rv = SECSuccess;
        }
    }

done:
    ssl_ReleaseSSL3HandshakeLock(ss);
    ssl_ReleaseRecvBufLock(ss);

    return rv;
}

static SECStatus
ssl3_ComputeTLSFinished(sslSocket *ss, ssl3CipherSpec *spec,
                        PRBool isServer,
                        const SSL3Hashes *hashes,
                        TLSFinished *tlsFinished)
{
    SECStatus rv;
    CK_TLS_MAC_PARAMS tls_mac_params;
    SECItem param = { siBuffer, NULL, 0 };
    PK11Context *prf_context;
    unsigned int retLen;

    PORT_Assert(spec->masterSecret);
    if (!spec->masterSecret) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    if (spec->version < SSL_LIBRARY_VERSION_TLS_1_2) {
        tls_mac_params.prfHashMechanism = CKM_TLS_PRF;
    } else {
        tls_mac_params.prfHashMechanism = ssl3_GetPrfHashMechanism(ss);
    }
    tls_mac_params.ulMacLength = 12;
    tls_mac_params.ulServerOrClient = isServer ? 1 : 2;
    param.data = (unsigned char *)&tls_mac_params;
    param.len = sizeof(tls_mac_params);
    prf_context = PK11_CreateContextBySymKey(CKM_TLS_MAC, CKA_SIGN,
                                             spec->masterSecret, &param);
    if (!prf_context)
        return SECFailure;

    rv = PK11_DigestBegin(prf_context);
    rv |= PK11_DigestOp(prf_context, hashes->u.raw, hashes->len);
    rv |= PK11_DigestFinal(prf_context, tlsFinished->verify_data, &retLen,
                           sizeof tlsFinished->verify_data);
    PORT_Assert(rv != SECSuccess || retLen == sizeof tlsFinished->verify_data);

    PK11_DestroyContext(prf_context, PR_TRUE);

    return rv;
}

/* The calling function must acquire and release the appropriate
 * lock (e.g., ssl_GetSpecReadLock / ssl_ReleaseSpecReadLock for
 * ss->ssl3.crSpec).
 */
SECStatus
ssl3_TLSPRFWithMasterSecret(sslSocket *ss, ssl3CipherSpec *spec,
                            const char *label, unsigned int labelLen,
                            const unsigned char *val, unsigned int valLen,
                            unsigned char *out, unsigned int outLen)
{
    SECItem param = { siBuffer, NULL, 0 };
    CK_MECHANISM_TYPE mech = CKM_TLS_PRF_GENERAL;
    PK11Context *prf_context;
    unsigned int retLen;
    SECStatus rv;

    if (!spec->masterSecret) {
        PORT_Assert(spec->masterSecret);
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    if (spec->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
        /* Bug 1312976 non-SHA256 exporters are broken. */
        if (ssl3_GetPrfHashMechanism(ss) != CKM_SHA256) {
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }
        mech = CKM_NSS_TLS_PRF_GENERAL_SHA256;
    }
    prf_context = PK11_CreateContextBySymKey(mech, CKA_SIGN,
                                             spec->masterSecret, &param);
    if (!prf_context)
        return SECFailure;

    rv = PK11_DigestBegin(prf_context);
    rv |= PK11_DigestOp(prf_context, (unsigned char *)label, labelLen);
    rv |= PK11_DigestOp(prf_context, val, valLen);
    rv |= PK11_DigestFinal(prf_context, out, &retLen, outLen);
    PORT_Assert(rv != SECSuccess || retLen == outLen);

    PK11_DestroyContext(prf_context, PR_TRUE);
    return rv;
}

/* called from ssl3_SendClientSecondRound
 *             ssl3_HandleFinished
 */
static SECStatus
ssl3_SendNextProto(sslSocket *ss)
{
    SECStatus rv;
    int padding_len;
    static const unsigned char padding[32] = { 0 };

    if (ss->xtnData.nextProto.len == 0 ||
        ss->xtnData.nextProtoState == SSL_NEXT_PROTO_SELECTED) {
        return SECSuccess;
    }

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    padding_len = 32 - ((ss->xtnData.nextProto.len + 2) % 32);

    rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_next_proto, ss->xtnData.nextProto.len + 2 + padding_len);
    if (rv != SECSuccess) {
        return rv; /* error code set by AppendHandshakeHeader */
    }
    rv = ssl3_AppendHandshakeVariable(ss, ss->xtnData.nextProto.data,
                                      ss->xtnData.nextProto.len, 1);
    if (rv != SECSuccess) {
        return rv; /* error code set by AppendHandshake */
    }
    rv = ssl3_AppendHandshakeVariable(ss, padding, padding_len, 1);
    if (rv != SECSuccess) {
        return rv; /* error code set by AppendHandshake */
    }
    return rv;
}

/* called from ssl3_SendFinished and tls13_DeriveSecret.
 *
 * This function is simply a debugging aid and therefore does not return a
 * SECStatus. */
void
ssl3_RecordKeyLog(sslSocket *ss, const char *label, PK11SymKey *secret)
{
#ifdef NSS_ALLOW_SSLKEYLOGFILE
    SECStatus rv;
    SECItem *keyData;
    /* Longest label is "CLIENT_HANDSHAKE_TRAFFIC_SECRET", master secret is 48
     * bytes which happens to be the largest in TLS 1.3 as well (SHA384).
     * Maximum line length: "CLIENT_HANDSHAKE_TRAFFIC_SECRET" (31) + " " (1) +
     * client_random (32*2) + " " (1) +
     * traffic_secret (48*2) + "\n" (1) = 194. */
    char buf[200];
    unsigned int offset, len;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (!ssl_keylog_iob)
        return;

    rv = PK11_ExtractKeyValue(secret);
    if (rv != SECSuccess)
        return;

    /* keyData does not need to be freed. */
    keyData = PK11_GetKeyData(secret);
    if (!keyData || !keyData->data)
        return;

    len = strlen(label) + 1 +          /* label + space */
          SSL3_RANDOM_LENGTH * 2 + 1 + /* client random (hex) + space */
          keyData->len * 2 + 1;        /* secret (hex) + newline */
    PORT_Assert(len <= sizeof(buf));
    if (len > sizeof(buf))
        return;

    /* https://developer.mozilla.org/en/NSS_Key_Log_Format */

    /* There could be multiple, concurrent writers to the
     * keylog, so we have to do everything in a single call to
     * fwrite. */

    strcpy(buf, label);
    offset = strlen(label);
    buf[offset++] += ' ';
    hexEncode(buf + offset, ss->ssl3.hs.client_random, SSL3_RANDOM_LENGTH);
    offset += SSL3_RANDOM_LENGTH * 2;
    buf[offset++] = ' ';
    hexEncode(buf + offset, keyData->data, keyData->len);
    offset += keyData->len * 2;
    buf[offset++] = '\n';

    PORT_Assert(offset == len);

    PZ_Lock(ssl_keylog_lock);
    if (fwrite(buf, len, 1, ssl_keylog_iob) == 1)
        fflush(ssl_keylog_iob);
    PZ_Unlock(ssl_keylog_lock);
#endif
}

/* called from ssl3_SendClientSecondRound
 *             ssl3_HandleClientHello
 *             ssl3_HandleFinished
 */
static SECStatus
ssl3_SendFinished(sslSocket *ss, PRInt32 flags)
{
    ssl3CipherSpec *cwSpec;
    PRBool isTLS;
    PRBool isServer = ss->sec.isServer;
    SECStatus rv;
    SSL3Sender sender = isServer ? sender_server : sender_client;
    SSL3Hashes hashes;
    TLSFinished tlsFinished;

    SSL_TRC(3, ("%d: SSL3[%d]: send finished handshake", SSL_GETPID(), ss->fd));

    PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PR_ASSERT(!ss->ssl3.hs.clientCertificatePending);

    ssl_GetSpecReadLock(ss);
    cwSpec = ss->ssl3.cwSpec;
    isTLS = (PRBool)(cwSpec->version > SSL_LIBRARY_VERSION_3_0);
    rv = ssl3_ComputeHandshakeHashes(ss, cwSpec, &hashes, sender);
    if (isTLS && rv == SECSuccess) {
        rv = ssl3_ComputeTLSFinished(ss, cwSpec, isServer, &hashes, &tlsFinished);
    }
    ssl_ReleaseSpecReadLock(ss);
    if (rv != SECSuccess) {
        goto fail; /* err code was set by ssl3_ComputeHandshakeHashes */
    }

    if (isTLS) {
        if (isServer)
            ss->ssl3.hs.finishedMsgs.tFinished[1] = tlsFinished;
        else
            ss->ssl3.hs.finishedMsgs.tFinished[0] = tlsFinished;
        ss->ssl3.hs.finishedBytes = sizeof tlsFinished;
        rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_finished, sizeof tlsFinished);
        if (rv != SECSuccess)
            goto fail; /* err set by AppendHandshake. */
        rv = ssl3_AppendHandshake(ss, &tlsFinished, sizeof tlsFinished);
        if (rv != SECSuccess)
            goto fail; /* err set by AppendHandshake. */
    } else {
        if (isServer)
            ss->ssl3.hs.finishedMsgs.sFinished[1] = hashes.u.s;
        else
            ss->ssl3.hs.finishedMsgs.sFinished[0] = hashes.u.s;
        PORT_Assert(hashes.len == sizeof hashes.u.s);
        ss->ssl3.hs.finishedBytes = sizeof hashes.u.s;
        rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_finished, sizeof hashes.u.s);
        if (rv != SECSuccess)
            goto fail; /* err set by AppendHandshake. */
        rv = ssl3_AppendHandshake(ss, &hashes.u.s, sizeof hashes.u.s);
        if (rv != SECSuccess)
            goto fail; /* err set by AppendHandshake. */
    }
    rv = ssl3_FlushHandshake(ss, flags);
    if (rv != SECSuccess) {
        goto fail; /* error code set by ssl3_FlushHandshake */
    }

    ssl3_RecordKeyLog(ss, "CLIENT_RANDOM", ss->ssl3.cwSpec->masterSecret);

    return SECSuccess;

fail:
    return rv;
}

/* wrap the master secret, and put it into the SID.
 * Caller holds the Spec read lock.
 */
SECStatus
ssl3_CacheWrappedSecret(sslSocket *ss, sslSessionID *sid,
                        PK11SymKey *secret)
{
    PK11SymKey *wrappingKey = NULL;
    PK11SlotInfo *symKeySlot;
    void *pwArg = ss->pkcs11PinArg;
    SECStatus rv = SECFailure;
    PRBool isServer = ss->sec.isServer;
    CK_MECHANISM_TYPE mechanism = CKM_INVALID_MECHANISM;

    symKeySlot = PK11_GetSlotFromKey(secret);
    if (!isServer) {
        int wrapKeyIndex;
        int incarnation;

        /* these next few functions are mere accessors and don't fail. */
        sid->u.ssl3.masterWrapIndex = wrapKeyIndex =
            PK11_GetCurrentWrapIndex(symKeySlot);
        PORT_Assert(wrapKeyIndex == 0); /* array has only one entry! */

        sid->u.ssl3.masterWrapSeries = incarnation =
            PK11_GetSlotSeries(symKeySlot);
        sid->u.ssl3.masterSlotID = PK11_GetSlotID(symKeySlot);
        sid->u.ssl3.masterModuleID = PK11_GetModuleID(symKeySlot);
        sid->u.ssl3.masterValid = PR_TRUE;
        /* Get the default wrapping key, for wrapping the master secret before
         * placing it in the SID cache entry. */
        wrappingKey = PK11_GetWrapKey(symKeySlot, wrapKeyIndex,
                                      CKM_INVALID_MECHANISM, incarnation,
                                      pwArg);
        if (wrappingKey) {
            mechanism = PK11_GetMechanism(wrappingKey); /* can't fail. */
        } else {
            int keyLength;
            /* if the wrappingKey doesn't exist, attempt to create it.
             * Note: we intentionally ignore errors here.  If we cannot
             * generate a wrapping key, it is not fatal to this SSL connection,
             * but we will not be able to restart this session.
             */
            mechanism = PK11_GetBestWrapMechanism(symKeySlot);
            keyLength = PK11_GetBestKeyLength(symKeySlot, mechanism);
            /* Zero length means fixed key length algorithm, or error.
             * It's ambiguous.
             */
            wrappingKey = PK11_KeyGen(symKeySlot, mechanism, NULL,
                                      keyLength, pwArg);
            if (wrappingKey) {
                /* The thread safety characteristics of PK11_[SG]etWrapKey is
                * abominable.  This protects against races in calling
                * PK11_SetWrapKey by dropping and re-acquiring the canonical
                * value once it is set.  The mutex in PK11_[SG]etWrapKey will
                * ensure that races produce the same value in the end. */
                PK11_SetWrapKey(symKeySlot, wrapKeyIndex, wrappingKey);
                PK11_FreeSymKey(wrappingKey);
                wrappingKey = PK11_GetWrapKey(symKeySlot, wrapKeyIndex,
                                              CKM_INVALID_MECHANISM, incarnation, pwArg);
                if (!wrappingKey) {
                    PK11_FreeSlot(symKeySlot);
                    return SECFailure;
                }
            }
        }
    } else {
        /* server socket using session cache. */
        mechanism = PK11_GetBestWrapMechanism(symKeySlot);
        if (mechanism != CKM_INVALID_MECHANISM) {
            wrappingKey =
                ssl3_GetWrappingKey(ss, symKeySlot, mechanism, pwArg);
            if (wrappingKey) {
                mechanism = PK11_GetMechanism(wrappingKey); /* can't fail. */
            }
        }
    }

    sid->u.ssl3.masterWrapMech = mechanism;
    PK11_FreeSlot(symKeySlot);

    if (wrappingKey) {
        SECItem wmsItem;

        wmsItem.data = sid->u.ssl3.keys.wrapped_master_secret;
        wmsItem.len = sizeof sid->u.ssl3.keys.wrapped_master_secret;
        rv = PK11_WrapSymKey(mechanism, NULL, wrappingKey,
                             secret, &wmsItem);
        /* rv is examined below. */
        sid->u.ssl3.keys.wrapped_master_secret_len = wmsItem.len;
        PK11_FreeSymKey(wrappingKey);
    }
    return rv;
}

/* Called from ssl3_HandlePostHelloHandshakeMessage() when it has deciphered
 * a complete ssl3 Finished message from the peer.
 * Caller must hold Handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length)
{
    SECStatus rv = SECSuccess;
    PRBool isServer = ss->sec.isServer;
    PRBool isTLS;
    SSL3Hashes hashes;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    SSL_TRC(3, ("%d: SSL3[%d]: handle finished handshake",
                SSL_GETPID(), ss->fd));

    if (ss->ssl3.hs.ws != wait_finished) {
        SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_FINISHED);
        return SECFailure;
    }

    if (!ss->sec.isServer || !ss->opt.requestCertificate) {
        dtls_ReceivedFirstMessageInFlight(ss);
    }

    rv = ssl3_ComputeHandshakeHashes(ss, ss->ssl3.crSpec, &hashes,
                                     isServer ? sender_client : sender_server);
    if (rv != SECSuccess) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return SECFailure;
    }

    rv = ssl_HashHandshakeMessage(ss, ssl_hs_finished, b, length);
    if (rv != SECSuccess) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return rv;
    }

    isTLS = (PRBool)(ss->ssl3.crSpec->version > SSL_LIBRARY_VERSION_3_0);
    if (isTLS) {
        TLSFinished tlsFinished;

        if (length != sizeof(tlsFinished)) {
#ifndef UNSAFE_FUZZER_MODE
            (void)SSL3_SendAlert(ss, alert_fatal, decode_error);
            PORT_SetError(SSL_ERROR_RX_MALFORMED_FINISHED);
            return SECFailure;
#endif
        }
        rv = ssl3_ComputeTLSFinished(ss, ss->ssl3.crSpec, !isServer,
                                     &hashes, &tlsFinished);
        if (!isServer)
            ss->ssl3.hs.finishedMsgs.tFinished[1] = tlsFinished;
        else
            ss->ssl3.hs.finishedMsgs.tFinished[0] = tlsFinished;
        ss->ssl3.hs.finishedBytes = sizeof(tlsFinished);
        if (rv != SECSuccess ||
            0 != NSS_SecureMemcmp(&tlsFinished, b,
                                  PR_MIN(length, ss->ssl3.hs.finishedBytes))) {
#ifndef UNSAFE_FUZZER_MODE
            (void)SSL3_SendAlert(ss, alert_fatal, decrypt_error);
            PORT_SetError(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
            return SECFailure;
#endif
        }
    } else {
        if (length != sizeof(SSL3Finished)) {
            (void)ssl3_IllegalParameter(ss);
            PORT_SetError(SSL_ERROR_RX_MALFORMED_FINISHED);
            return SECFailure;
        }

        if (!isServer)
            ss->ssl3.hs.finishedMsgs.sFinished[1] = hashes.u.s;
        else
            ss->ssl3.hs.finishedMsgs.sFinished[0] = hashes.u.s;
        PORT_Assert(hashes.len == sizeof hashes.u.s);
        ss->ssl3.hs.finishedBytes = sizeof hashes.u.s;
        if (0 != NSS_SecureMemcmp(&hashes.u.s, b, length)) {
            (void)ssl3_HandshakeFailure(ss);
            PORT_SetError(SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE);
            return SECFailure;
        }
    }

    ssl_GetXmitBufLock(ss); /*************************************/

    if ((isServer && !ss->ssl3.hs.isResuming) ||
        (!isServer && ss->ssl3.hs.isResuming)) {
        PRInt32 flags = 0;

        /* Send a NewSessionTicket message if the client sent us
         * either an empty session ticket, or one that did not verify.
         * (Note that if either of these conditions was met, then the
         * server has sent a SessionTicket extension in the
         * ServerHello message.)
         */
        if (isServer && !ss->ssl3.hs.isResuming &&
            ssl3_ExtensionNegotiated(ss, ssl_session_ticket_xtn) &&
            ssl3_KEASupportsTickets(ss->ssl3.hs.kea_def)) {
            /* RFC 5077 Section 3.3: "In the case of a full handshake, the
             * server MUST verify the client's Finished message before sending
             * the ticket." Presumably, this also means that the client's
             * certificate, if any, must be verified beforehand too.
             */
            rv = ssl3_SendNewSessionTicket(ss);
            if (rv != SECSuccess) {
                goto xmit_loser;
            }
        }

        rv = ssl3_SendChangeCipherSpecs(ss);
        if (rv != SECSuccess) {
            goto xmit_loser; /* err is set. */
        }
        /* If this thread is in SSL_SecureSend (trying to write some data)
        ** then set the ssl_SEND_FLAG_FORCE_INTO_BUFFER flag, so that the
        ** last two handshake messages (change cipher spec and finished)
        ** will be sent in the same send/write call as the application data.
        */
        if (ss->writerThread == PR_GetCurrentThread()) {
            flags = ssl_SEND_FLAG_FORCE_INTO_BUFFER;
        }

        if (!isServer && !ss->firstHsDone) {
            rv = ssl3_SendNextProto(ss);
            if (rv != SECSuccess) {
                goto xmit_loser; /* err code was set. */
            }
        }

        if (IS_DTLS(ss)) {
            flags |= ssl_SEND_FLAG_NO_RETRANSMIT;
        }

        rv = ssl3_SendFinished(ss, flags);
        if (rv != SECSuccess) {
            goto xmit_loser; /* err is set. */
        }
    }

xmit_loser:
    ssl_ReleaseXmitBufLock(ss); /*************************************/
    if (rv != SECSuccess) {
        return rv;
    }

    if (ss->ssl3.hs.authCertificatePending) {
        if (ss->ssl3.hs.restartTarget) {
            PR_NOT_REACHED("ssl3_HandleFinished: unexpected restartTarget");
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }

        ss->ssl3.hs.restartTarget = ssl3_FinishHandshake;
        PORT_SetError(PR_WOULD_BLOCK_ERROR);
        return SECFailure;
    }

    rv = ssl3_FinishHandshake(ss);
    return rv;
}

SECStatus
ssl3_FillInCachedSID(sslSocket *ss, sslSessionID *sid, PK11SymKey *secret)
{
    PORT_Assert(secret);

    /* fill in the sid */
    sid->u.ssl3.cipherSuite = ss->ssl3.hs.cipher_suite;
    sid->u.ssl3.policy = ss->ssl3.policy;
    sid->version = ss->version;
    sid->authType = ss->sec.authType;
    sid->authKeyBits = ss->sec.authKeyBits;
    sid->keaType = ss->sec.keaType;
    sid->keaKeyBits = ss->sec.keaKeyBits;
    if (ss->sec.keaGroup) {
        sid->keaGroup = ss->sec.keaGroup->name;
    } else {
        sid->keaGroup = ssl_grp_none;
    }
    sid->sigScheme = ss->sec.signatureScheme;
    sid->lastAccessTime = sid->creationTime = ssl_Time(ss);
    sid->expirationTime = sid->creationTime + (ssl_ticket_lifetime * PR_USEC_PER_SEC);
    sid->localCert = CERT_DupCertificate(ss->sec.localCert);
    if (ss->sec.isServer) {
        sid->namedCurve = ss->sec.serverCert->namedCurve;
    }

    if (ss->xtnData.nextProtoState != SSL_NEXT_PROTO_NO_SUPPORT &&
        ss->xtnData.nextProto.data) {
        SECITEM_FreeItem(&sid->u.ssl3.alpnSelection, PR_FALSE);
        if (SECITEM_CopyItem(
                NULL, &sid->u.ssl3.alpnSelection, &ss->xtnData.nextProto) != SECSuccess) {
            return SECFailure; /* error already set. */
        }
    }

    /* Copy the master secret (wrapped or unwrapped) into the sid */
    return ssl3_CacheWrappedSecret(ss, ss->sec.ci.sid, secret);
}

/* The return type is SECStatus instead of void because this function needs
 * to have type sslRestartTarget.
 */
SECStatus
ssl3_FinishHandshake(sslSocket *ss)
{
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
    PORT_Assert(ss->ssl3.hs.restartTarget == NULL);
    sslSessionID *sid = ss->sec.ci.sid;
    SECStatus sidRv = SECFailure;

    /* The first handshake is now completed. */
    ss->handshake = NULL;

    if (sid->cached == never_cached && !ss->opt.noCache) {
        /* If the wrap fails, don't cache the sid. The connection proceeds
         * normally, so the rv is only used to determine whether we cache. */
        sidRv = ssl3_FillInCachedSID(ss, sid, ss->ssl3.crSpec->masterSecret);
    }

    /* RFC 5077 Section 3.3: "The client MUST NOT treat the ticket as valid
    * until it has verified the server's Finished message." When the server
    * sends a NewSessionTicket in a resumption handshake, we must wait until
    * the handshake is finished (we have verified the server's Finished
    * AND the server's certificate) before we update the ticket in the sid.
    *
    * This must be done before we call ssl_CacheSessionID(ss)
    * because CacheSID requires the session ticket to already be set, and also
    * because of the lazy lock creation scheme used by CacheSID and
    * ssl3_SetSIDSessionTicket. */
    if (ss->ssl3.hs.receivedNewSessionTicket) {
        PORT_Assert(!ss->sec.isServer);
        if (sidRv == SECSuccess) {
            /* The sid takes over the ticket data */
            ssl3_SetSIDSessionTicket(ss->sec.ci.sid,
                                     &ss->ssl3.hs.newSessionTicket);
        } else {
            PORT_Assert(ss->ssl3.hs.newSessionTicket.ticket.data);
            SECITEM_FreeItem(&ss->ssl3.hs.newSessionTicket.ticket,
                             PR_FALSE);
        }
        PORT_Assert(!ss->ssl3.hs.newSessionTicket.ticket.data);
        ss->ssl3.hs.receivedNewSessionTicket = PR_FALSE;
    }
    if (sidRv == SECSuccess) {
        PORT_Assert(ss->sec.ci.sid->cached == never_cached);
        ssl_CacheSessionID(ss);
    }

    ss->ssl3.hs.canFalseStart = PR_FALSE; /* False Start phase is complete */
    ss->ssl3.hs.ws = idle_handshake;

    return ssl_FinishHandshake(ss);
}

SECStatus
ssl_HashHandshakeMessageInt(sslSocket *ss, SSLHandshakeType ct,
                            PRUint32 dtlsSeq,
                            const PRUint8 *b, PRUint32 length,
                            sslUpdateHandshakeHashes updateHashes)
{
    PRUint8 hdr[4];
    PRUint8 dtlsData[8];
    SECStatus rv;

    PRINT_BUF(50, (ss, "Hash handshake message:", b, length));

    hdr[0] = (PRUint8)ct;
    hdr[1] = (PRUint8)(length >> 16);
    hdr[2] = (PRUint8)(length >> 8);
    hdr[3] = (PRUint8)(length);

    rv = updateHashes(ss, (unsigned char *)hdr, 4);
    if (rv != SECSuccess)
        return rv; /* err code already set. */

    /* Extra data to simulate a complete DTLS handshake fragment */
    if (IS_DTLS(ss)) {
        /* Sequence number */
        dtlsData[0] = MSB(dtlsSeq);
        dtlsData[1] = LSB(dtlsSeq);

        /* Fragment offset */
        dtlsData[2] = 0;
        dtlsData[3] = 0;
        dtlsData[4] = 0;

        /* Fragment length */
        dtlsData[5] = (PRUint8)(length >> 16);
        dtlsData[6] = (PRUint8)(length >> 8);
        dtlsData[7] = (PRUint8)(length);

        rv = updateHashes(ss, (unsigned char *)dtlsData, sizeof(dtlsData));
        if (rv != SECSuccess)
            return rv; /* err code already set. */
    }

    /* The message body */
    rv = updateHashes(ss, b, length);
    if (rv != SECSuccess)
        return rv; /* err code already set. */

    return SECSuccess;
}

SECStatus
ssl_HashHandshakeMessage(sslSocket *ss, SSLHandshakeType ct,
                         const PRUint8 *b, PRUint32 length)
{
    return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
                                       b, length, ssl3_UpdateHandshakeHashes);
}

SECStatus
ssl_HashHandshakeMessageDefault(sslSocket *ss, SSLHandshakeType ct,
                                const PRUint8 *b, PRUint32 length)
{
    return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
                                       b, length, ssl3_UpdateDefaultHandshakeHashes);
}
SECStatus
ssl_HashHandshakeMessageEchInner(sslSocket *ss, SSLHandshakeType ct,
                                 const PRUint8 *b, PRUint32 length)
{
    return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
                                       b, length, ssl3_UpdateInnerHandshakeHashes);
}

SECStatus
ssl_HashPostHandshakeMessage(sslSocket *ss, SSLHandshakeType ct,
                             const PRUint8 *b, PRUint32 length)
{
    return ssl_HashHandshakeMessageInt(ss, ct, ss->ssl3.hs.recvMessageSeq,
                                       b, length, ssl3_UpdatePostHandshakeHashes);
}

/* Called from ssl3_HandleHandshake() when it has gathered a complete ssl3
 * handshake message.
 * Caller must hold Handshake and RecvBuf locks.
 */
SECStatus
ssl3_HandleHandshakeMessage(sslSocket *ss, PRUint8 *b, PRUint32 length,
                            PRBool endOfRecord)
{
    SECStatus rv = SECSuccess;
    PRUint16 epoch;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    SSL_TRC(30, ("%d: SSL3[%d]: handle handshake message: %s", SSL_GETPID(),
                 ss->fd, ssl3_DecodeHandshakeType(ss->ssl3.hs.msg_type)));

    /* Start new handshake hashes when we start a new handshake. */
    if (ss->ssl3.hs.msg_type == ssl_hs_client_hello) {
        ssl3_RestartHandshakeHashes(ss);
    }
    switch (ss->ssl3.hs.msg_type) {
        case ssl_hs_hello_request:
        case ssl_hs_hello_verify_request:
            /* We don't include hello_request and hello_verify_request messages
             * in the handshake hashes */
            break;

        /* Defer hashing of these messages until the message handlers. */
        case ssl_hs_client_hello:
        case ssl_hs_server_hello:
        case ssl_hs_certificate_verify:
        case ssl_hs_finished:
            break;

        default:
            if (!tls13_IsPostHandshake(ss)) {
                rv = ssl_HashHandshakeMessage(ss, ss->ssl3.hs.msg_type, b, length);
                if (rv != SECSuccess) {
                    return SECFailure;
                }
            }
    }

    PORT_SetError(0); /* each message starts with no error. */

    if (ss->ssl3.hs.ws == wait_certificate_status &&
        ss->ssl3.hs.msg_type != ssl_hs_certificate_status) {
        /* If we negotiated the certificate_status extension then we deferred
         * certificate validation until we get the CertificateStatus messsage.
         * But the CertificateStatus message is optional. If the server did
         * not send it then we need to validate the certificate now. If the
         * server does send the CertificateStatus message then we will
         * authenticate the certificate in ssl3_HandleCertificateStatus.
         */
        rv = ssl3_AuthCertificate(ss); /* sets ss->ssl3.hs.ws */
        if (rv != SECSuccess) {
            /* This can't block. */
            PORT_Assert(PORT_GetError() != PR_WOULD_BLOCK_ERROR);
            return SECFailure;
        }
    }

    epoch = ss->ssl3.crSpec->epoch;
    switch (ss->ssl3.hs.msg_type) {
        case ssl_hs_client_hello:
            if (!ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CLIENT_HELLO);
                return SECFailure;
            }
            rv = ssl3_HandleClientHello(ss, b, length);
            break;
        case ssl_hs_server_hello:
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_SERVER_HELLO);
                return SECFailure;
            }
            rv = ssl3_HandleServerHello(ss, b, length);
            break;
        default:
            if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
                rv = ssl3_HandlePostHelloHandshakeMessage(ss, b, length);
            } else {
                rv = tls13_HandlePostHelloHandshakeMessage(ss, b, length);
            }
            break;
    }
    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
        (epoch != ss->ssl3.crSpec->epoch) && !endOfRecord) {
        /* If we changed read cipher states, there must not be any
         * data in the input queue. */
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HANDSHAKE);
        return SECFailure;
    }
    /* We consider the record to have been handled if SECSuccess or else WOULD_BLOCK is set
     * Whoever set WOULD_BLOCK must handle any remaining actions required to finsih processing the record.
     * e.g. by setting restartTarget.
     */
    if (IS_DTLS(ss) && (rv == SECSuccess || (rv == SECFailure && PR_GetError() == PR_WOULD_BLOCK_ERROR))) {
        /* Increment the expected sequence number */
        ss->ssl3.hs.recvMessageSeq++;
    }

    /* Taint the message so that it's easier to detect UAFs. */
    PORT_Memset(b, 'N', length);

    return rv;
}

static SECStatus
ssl3_HandlePostHelloHandshakeMessage(sslSocket *ss, PRUint8 *b,
                                     PRUint32 length)
{
    SECStatus rv;
    PORT_Assert(ss->version < SSL_LIBRARY_VERSION_TLS_1_3);

    switch (ss->ssl3.hs.msg_type) {
        case ssl_hs_hello_request:
            if (length != 0) {
                (void)ssl3_DecodeError(ss);
                PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_REQUEST);
                return SECFailure;
            }
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HELLO_REQUEST);
                return SECFailure;
            }
            rv = ssl3_HandleHelloRequest(ss);
            break;

        case ssl_hs_hello_verify_request:
            if (!IS_DTLS(ss) || ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HELLO_VERIFY_REQUEST);
                return SECFailure;
            }
            rv = dtls_HandleHelloVerifyRequest(ss, b, length);
            break;
        case ssl_hs_certificate:
            rv = ssl3_HandleCertificate(ss, b, length);
            break;
        case ssl_hs_certificate_status:
            rv = ssl3_HandleCertificateStatus(ss, b, length);
            break;
        case ssl_hs_server_key_exchange:
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_SERVER_KEY_EXCH);
                return SECFailure;
            }
            rv = ssl3_HandleServerKeyExchange(ss, b, length);
            break;
        case ssl_hs_certificate_request:
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CERT_REQUEST);
                return SECFailure;
            }
            rv = ssl3_HandleCertificateRequest(ss, b, length);
            break;
        case ssl_hs_server_hello_done:
            if (length != 0) {
                (void)ssl3_DecodeError(ss);
                PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_DONE);
                return SECFailure;
            }
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_HELLO_DONE);
                return SECFailure;
            }
            rv = ssl3_HandleServerHelloDone(ss);
            break;
        case ssl_hs_certificate_verify:
            if (!ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CERT_VERIFY);
                return SECFailure;
            }
            rv = ssl3_HandleCertificateVerify(ss, b, length);
            break;
        case ssl_hs_client_key_exchange:
            if (!ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CLIENT_KEY_EXCH);
                return SECFailure;
            }
            rv = ssl3_HandleClientKeyExchange(ss, b, length);
            break;
        case ssl_hs_new_session_ticket:
            if (ss->sec.isServer) {
                (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
                PORT_SetError(SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET);
                return SECFailure;
            }
            rv = ssl3_HandleNewSessionTicket(ss, b, length);
            break;
        case ssl_hs_finished:
            rv = ssl3_HandleFinished(ss, b, length);
            break;
        default:
            (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
            PORT_SetError(SSL_ERROR_RX_UNKNOWN_HANDSHAKE);
            rv = SECFailure;
    }

    return rv;
}

/* Called only from ssl3_HandleRecord, for each (deciphered) ssl3 record.
 * origBuf is the decrypted ssl record content.
 * Caller must hold the handshake and RecvBuf locks.
 */
static SECStatus
ssl3_HandleHandshake(sslSocket *ss, sslBuffer *origBuf)
{
    sslBuffer buf = *origBuf; /* Work from a copy. */
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    while (buf.len > 0) {
        if (ss->ssl3.hs.header_bytes < 4) {
            PRUint8 t;
            t = *(buf.buf++);
            buf.len--;
            if (ss->ssl3.hs.header_bytes++ == 0)
                ss->ssl3.hs.msg_type = (SSLHandshakeType)t;
            else
                ss->ssl3.hs.msg_len = (ss->ssl3.hs.msg_len << 8) + t;
            if (ss->ssl3.hs.header_bytes < 4)
                continue;

#define MAX_HANDSHAKE_MSG_LEN 0x1ffff /* 128k - 1 */
            if (ss->ssl3.hs.msg_len > MAX_HANDSHAKE_MSG_LEN) {
                (void)ssl3_DecodeError(ss);
                PORT_SetError(SSL_ERROR_RX_MALFORMED_HANDSHAKE);
                goto loser;
            }
#undef MAX_HANDSHAKE_MSG_LEN

            /* If msg_len is zero, be sure we fall through,
            ** even if buf.len is zero.
            */
            if (ss->ssl3.hs.msg_len > 0)
                continue;
        }

        /*
         * Header has been gathered and there is at least one byte of new
         * data available for this message. If it can be done right out
         * of the original buffer, then use it from there.
         */
        if (ss->ssl3.hs.msg_body.len == 0 && buf.len >= ss->ssl3.hs.msg_len) {
            /* handle it from input buffer */
            rv = ssl3_HandleHandshakeMessage(ss, buf.buf, ss->ssl3.hs.msg_len,
                                             buf.len == ss->ssl3.hs.msg_len);
            buf.buf += ss->ssl3.hs.msg_len;
            buf.len -= ss->ssl3.hs.msg_len;
            ss->ssl3.hs.msg_len = 0;
            ss->ssl3.hs.header_bytes = 0;
            if (rv != SECSuccess) {
                goto loser;
            }
        } else {
            /* must be copied to msg_body and dealt with from there */
            unsigned int bytes;

            PORT_Assert(ss->ssl3.hs.msg_body.len < ss->ssl3.hs.msg_len);
            bytes = PR_MIN(buf.len, ss->ssl3.hs.msg_len - ss->ssl3.hs.msg_body.len);

            /* Grow the buffer if needed */
            rv = sslBuffer_Grow(&ss->ssl3.hs.msg_body, ss->ssl3.hs.msg_len);
            if (rv != SECSuccess) {
                /* sslBuffer_Grow has set a memory error code. */
                goto loser;
            }

            PORT_Memcpy(ss->ssl3.hs.msg_body.buf + ss->ssl3.hs.msg_body.len,
                        buf.buf, bytes);
            ss->ssl3.hs.msg_body.len += bytes;
            buf.buf += bytes;
            buf.len -= bytes;

            PORT_Assert(ss->ssl3.hs.msg_body.len <= ss->ssl3.hs.msg_len);

            /* if we have a whole message, do it */
            if (ss->ssl3.hs.msg_body.len == ss->ssl3.hs.msg_len) {
                rv = ssl3_HandleHandshakeMessage(
                    ss, ss->ssl3.hs.msg_body.buf, ss->ssl3.hs.msg_len,
                    buf.len == 0);
                ss->ssl3.hs.msg_body.len = 0;
                ss->ssl3.hs.msg_len = 0;
                ss->ssl3.hs.header_bytes = 0;
                if (rv != SECSuccess) {
                    goto loser;
                }
            } else {
                PORT_Assert(buf.len == 0);
                break;
            }
        }
    } /* end loop */

    origBuf->len = 0; /* So ssl3_GatherAppDataRecord will keep looping. */
    return SECSuccess;

loser : {
    /* Make sure to remove any data that was consumed. */
    unsigned int consumed = origBuf->len - buf.len;
    PORT_Assert(consumed == buf.buf - origBuf->buf);
    if (consumed > 0) {
        memmove(origBuf->buf, origBuf->buf + consumed, buf.len);
        origBuf->len = buf.len;
    }
}
    return SECFailure;
}

/* SECStatusToMask returns, in constant time, a mask value of all ones if
 * rv == SECSuccess.  Otherwise it returns zero. */
static unsigned int
SECStatusToMask(SECStatus rv)
{
    return PORT_CT_EQ(rv, SECSuccess);
}

/* ssl_ConstantTimeGE returns 0xffffffff if a>=b and 0x00 otherwise. */
static unsigned char
ssl_ConstantTimeGE(unsigned int a, unsigned int b)
{
    return PORT_CT_GE(a, b);
}

/* ssl_ConstantTimeEQ returns 0xffffffff if a==b and 0x00 otherwise. */
static unsigned char
ssl_ConstantTimeEQ(unsigned char a, unsigned char b)
{
    return PORT_CT_EQ(a, b);
}

/* ssl_constantTimeSelect return a if mask is 0xFF and b if mask is 0x00 */
static unsigned char
ssl_constantTimeSelect(unsigned char mask, unsigned char a, unsigned char b)
{
    return (mask & a) | (~mask & b);
}

static SECStatus
ssl_RemoveSSLv3CBCPadding(sslBuffer *plaintext,
                          unsigned int blockSize,
                          unsigned int macSize)
{
    unsigned int paddingLength, good;
    const unsigned int overhead = 1 /* padding length byte */ + macSize;

    /* These lengths are all public so we can test them in non-constant
     * time. */
    if (overhead > plaintext->len) {
        return SECFailure;
    }

    paddingLength = plaintext->buf[plaintext->len - 1];
    /* SSLv3 padding bytes are random and cannot be checked. */
    good = PORT_CT_GE(plaintext->len, paddingLength + overhead);
    /* SSLv3 requires that the padding is minimal. */
    good &= PORT_CT_GE(blockSize, paddingLength + 1);
    plaintext->len -= good & (paddingLength + 1);
    return (good & SECSuccess) | (~good & SECFailure);
}

SECStatus
ssl_RemoveTLSCBCPadding(sslBuffer *plaintext, unsigned int macSize)
{
    unsigned int paddingLength, good, toCheck, i;
    const unsigned int overhead = 1 /* padding length byte */ + macSize;

    /* These lengths are all public so we can test them in non-constant
     * time. */
    if (overhead > plaintext->len) {
        return SECFailure;
    }

    paddingLength = plaintext->buf[plaintext->len - 1];
    good = PORT_CT_GE(plaintext->len, paddingLength + overhead);

    /* The padding consists of a length byte at the end of the record and then
     * that many bytes of padding, all with the same value as the length byte.
     * Thus, with the length byte included, there are paddingLength+1 bytes of
     * padding.
     *
     * We can't check just |paddingLength+1| bytes because that leaks
     * decrypted information. Therefore we always have to check the maximum
     * amount of padding possible. (Again, the length of the record is
     * public information so we can use it.) */
    toCheck = 256; /* maximum amount of padding + 1. */
    if (toCheck > plaintext->len) {
        toCheck = plaintext->len;
    }

    for (i = 0; i < toCheck; i++) {
        /* If i <= paddingLength then the MSB of t is zero and mask is
         * 0xff.  Otherwise, mask is 0. */
        unsigned char mask = PORT_CT_LE(i, paddingLength);
        unsigned char b = plaintext->buf[plaintext->len - 1 - i];
        /* The final |paddingLength+1| bytes should all have the value
         * |paddingLength|. Therefore the XOR should be zero. */
        good &= ~(mask & (paddingLength ^ b));
    }

    /* If any of the final |paddingLength+1| bytes had the wrong value,
     * one or more of the lower eight bits of |good| will be cleared. We
     * AND the bottom 8 bits together and duplicate the result to all the
     * bits. */
    good &= good >> 4;
    good &= good >> 2;
    good &= good >> 1;
    good <<= sizeof(good) * 8 - 1;
    good = PORT_CT_DUPLICATE_MSB_TO_ALL(good);

    plaintext->len -= good & (paddingLength + 1);
    return (good & SECSuccess) | (~good & SECFailure);
}

/* On entry:
 *   originalLength >= macSize
 *   macSize <= MAX_MAC_LENGTH
 *   plaintext->len >= macSize
 */
static void
ssl_CBCExtractMAC(sslBuffer *plaintext,
                  unsigned int originalLength,
                  PRUint8 *out,
                  unsigned int macSize)
{
    unsigned char rotatedMac[MAX_MAC_LENGTH];
    /* macEnd is the index of |plaintext->buf| just after the end of the
     * MAC. */
    unsigned macEnd = plaintext->len;
    unsigned macStart = macEnd - macSize;
    /* scanStart contains the number of bytes that we can ignore because
     * the MAC's position can only vary by 255 bytes. */
    unsigned scanStart = 0;
    unsigned i, j;
    unsigned char rotateOffset;

    if (originalLength > macSize + 255 + 1) {
        scanStart = originalLength - (macSize + 255 + 1);
    }

    /* We want to compute
     * rotateOffset = (macStart - scanStart) % macSize
     * But the time to compute this varies based on the amount of padding. Thus
     * we explicitely handle all mac sizes with (hopefully) constant time modulo
     * using Barrett reduction:
     *  q := (rotateOffset * m) >> k
     *  rotateOffset -= q * n
     *  if (n <= rotateOffset) rotateOffset -= n
     */
    rotateOffset = macStart - scanStart;
    /* rotateOffset < 255 + 1 + 48 = 304 */
    if (macSize == 16) {
        rotateOffset &= 15;
    } else if (macSize == 20) {
        /*
         * Correctness: rotateOffset * ( 1/20 - 25/2^9 ) < 1
         *              with rotateOffset <= 853
         */
        unsigned q = (rotateOffset * 25) >> 9;
        rotateOffset -= q * 20;
        rotateOffset -= ssl_constantTimeSelect(ssl_ConstantTimeGE(rotateOffset, 20),
                                               20, 0);
    } else if (macSize == 32) {
        rotateOffset &= 31;
    } else if (macSize == 48) {
        /*
         * Correctness: rotateOffset * ( 1/48 - 10/2^9 ) < 1
         *              with rotateOffset < 768
         */
        unsigned q = (rotateOffset * 10) >> 9;
        rotateOffset -= q * 48;
        rotateOffset -= ssl_constantTimeSelect(ssl_ConstantTimeGE(rotateOffset, 48),
                                               48, 0);
    } else {
        /*
         * SHA384 (macSize == 48) is the largest we support. We should never
         * get here.
         */
        PORT_Assert(0);
        rotateOffset = rotateOffset % macSize;
    }

    memset(rotatedMac, 0, macSize);
    for (i = scanStart; i < originalLength;) {
        for (j = 0; j < macSize && i < originalLength; i++, j++) {
            unsigned char macStarted = ssl_ConstantTimeGE(i, macStart);
            unsigned char macEnded = ssl_ConstantTimeGE(i, macEnd);
            unsigned char b = 0;
            b = plaintext->buf[i];
            rotatedMac[j] |= b & macStarted & ~macEnded;
        }
    }

    /* Now rotate the MAC. If we knew that the MAC fit into a CPU cache line
     * we could line-align |rotatedMac| and rotate in place. */
    memset(out, 0, macSize);
    rotateOffset = macSize - rotateOffset;
    rotateOffset = ssl_constantTimeSelect(ssl_ConstantTimeGE(rotateOffset, macSize),
                                          0, rotateOffset);
    for (i = 0; i < macSize; i++) {
        for (j = 0; j < macSize; j++) {
            out[j] |= rotatedMac[i] & ssl_ConstantTimeEQ(j, rotateOffset);
        }
        rotateOffset++;
        rotateOffset = ssl_constantTimeSelect(ssl_ConstantTimeGE(rotateOffset, macSize),
                                              0, rotateOffset);
    }
}

/* MAX_EXPANSION is the amount by which a record might plausibly be expanded
 * when protected.  It's the worst case estimate, so the sum of block cipher
 * padding (up to 256 octets), HMAC (48 octets for SHA-384), and IV (16
 * octets for AES). */
#define MAX_EXPANSION (256 + 48 + 16)

/* Unprotect an SSL3 record and leave the result in plaintext.
 *
 * If SECFailure is returned, we:
 * 1. Set |*alert| to the alert to be sent.
 * 2. Call PORT_SetError() with an appropriate code.
 *
 * Called by ssl3_HandleRecord. Caller must hold the spec read lock.
 * Therefore, we MUST not call SSL3_SendAlert().
 *
 */
static SECStatus
ssl3_UnprotectRecord(sslSocket *ss,
                     ssl3CipherSpec *spec,
                     SSL3Ciphertext *cText, sslBuffer *plaintext,
                     SSL3AlertDescription *alert)
{
    const ssl3BulkCipherDef *cipher_def = spec->cipherDef;
    PRBool isTLS;
    unsigned int good;
    unsigned int ivLen = 0;
    SSLContentType rType;
    SSL3ProtocolVersion rVersion;
    unsigned int minLength;
    unsigned int originalLen = 0;
    PRUint8 headerBuf[13];
    sslBuffer header = SSL_BUFFER(headerBuf);
    PRUint8 hash[MAX_MAC_LENGTH];
    PRUint8 givenHashBuf[MAX_MAC_LENGTH];
    PRUint8 *givenHash;
    unsigned int hashBytes = MAX_MAC_LENGTH + 1;
    SECStatus rv;

    PORT_Assert(spec->direction == ssl_secret_read);

    good = ~0U;
    minLength = spec->macDef->mac_size;
    if (cipher_def->type == type_block) {
        /* CBC records have a padding length byte at the end. */
        minLength++;
        if (spec->version >= SSL_LIBRARY_VERSION_TLS_1_1) {
            /* With >= TLS 1.1, CBC records have an explicit IV. */
            minLength += cipher_def->iv_size;
        }
    } else if (cipher_def->type == type_aead) {
        minLength = cipher_def->explicit_nonce_size + cipher_def->tag_size;
    }

    /* We can perform this test in variable time because the record's total
     * length and the ciphersuite are both public knowledge. */
    if (cText->buf->len < minLength) {
        goto decrypt_loser;
    }

    if (cipher_def->type == type_block &&
        spec->version >= SSL_LIBRARY_VERSION_TLS_1_1) {
        /* Consume the per-record explicit IV. RFC 4346 Section 6.2.3.2 states
         * "The receiver decrypts the entire GenericBlockCipher structure and
         * then discards the first cipher block corresponding to the IV
         * component." Instead, we decrypt the first cipher block and then
         * discard it before decrypting the rest.
         */
        PRUint8 iv[MAX_IV_LENGTH];
        unsigned int decoded;

        ivLen = cipher_def->iv_size;
        if (ivLen < 8 || ivLen > sizeof(iv)) {
            *alert = internal_error;
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            return SECFailure;
        }

        PRINT_BUF(80, (ss, "IV (ciphertext):", cText->buf->buf, ivLen));

        /* The decryption result is garbage, but since we just throw away
         * the block it doesn't matter.  The decryption of the next block
         * depends only on the ciphertext of the IV block.
         */
        rv = spec->cipher(spec->cipherContext, iv, &decoded,
                          sizeof(iv), cText->buf->buf, ivLen);

        good &= SECStatusToMask(rv);
    }

    PRINT_BUF(80, (ss, "ciphertext:", cText->buf->buf + ivLen,
                   cText->buf->len - ivLen));

    /* Check if the ciphertext can be valid if we assume maximum plaintext and
     * add the maximum possible ciphersuite expansion.
     * This way we detect overlong plaintexts/padding before decryption.
     * This check enforces size limitations more strict than the RFC.
     * [RFC5246, Section 6.2.3] */
    if (cText->buf->len > (spec->recordSizeLimit + MAX_EXPANSION)) {
        *alert = record_overflow;
        PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
        return SECFailure;
    }

    isTLS = (PRBool)(spec->version > SSL_LIBRARY_VERSION_3_0);
    rType = (SSLContentType)cText->hdr[0];
    rVersion = ((SSL3ProtocolVersion)cText->hdr[1] << 8) |
               (SSL3ProtocolVersion)cText->hdr[2];
    if (cipher_def->type == type_aead) {
        /* XXX For many AEAD ciphers, the plaintext is shorter than the
         * ciphertext by a fixed byte count, but it is not true in general.
         * Each AEAD cipher should provide a function that returns the
         * plaintext length for a given ciphertext. */
        const unsigned int explicitNonceLen = cipher_def->explicit_nonce_size;
        const unsigned int tagLen = cipher_def->tag_size;
        unsigned int nonceLen = explicitNonceLen;
        unsigned int decryptedLen = cText->buf->len - nonceLen - tagLen;
        /* even though read doesn't return and IV, we still need a space to put
         * the combined iv/nonce n the gcm 1.2 case*/
        unsigned char ivOut[MAX_IV_LENGTH];
        unsigned char *iv = NULL;
        unsigned char *nonce = NULL;

        ivLen = cipher_def->iv_size;

        rv = ssl3_BuildRecordPseudoHeader(
            spec->epoch, cText->seqNum,
            rType, isTLS, rVersion, IS_DTLS(ss), decryptedLen, &header);
        PORT_Assert(rv == SECSuccess);

        /* build the iv */
        if (explicitNonceLen == 0) {
            nonceLen = sizeof(cText->seqNum);
            iv = spec->keyMaterial.iv;
            nonce = SSL_BUFFER_BASE(&header);
        } else {
            PORT_Memcpy(ivOut, spec->keyMaterial.iv, ivLen);
            PORT_Memset(ivOut + ivLen, 0, explicitNonceLen);
            iv = ivOut;
            nonce = cText->buf->buf;
            nonceLen = explicitNonceLen;
        }
        rv = tls13_AEAD(spec->cipherContext, PR_TRUE,
                        CKG_NO_GENERATE, 0,       /* iv generator params
                                                        * (not used in decrypt)*/
                        iv,                       /* iv in */
                        NULL,                     /* iv out */
                        ivLen + explicitNonceLen, /* full iv length */
                        nonce, nonceLen,          /* nonce in */
                        SSL_BUFFER_BASE(&header), /* aad */
                        SSL_BUFFER_LEN(&header),  /* aadlen */
                        plaintext->buf,           /* output  */
                        &plaintext->len,          /* out len */
                        plaintext->space,         /* max out */
                        tagLen,
                        cText->buf->buf + explicitNonceLen,  /* input */
                        cText->buf->len - explicitNonceLen); /* input len */
        if (rv != SECSuccess) {
            good = 0;
        }
    } else {
        if (cipher_def->type == type_block &&
            ((cText->buf->len - ivLen) % cipher_def->block_size) != 0) {
            goto decrypt_loser;
        }

        /* decrypt from cText buf to plaintext. */
        rv = spec->cipher(
            spec->cipherContext, plaintext->buf, &plaintext->len,
            plaintext->space, cText->buf->buf + ivLen, cText->buf->len - ivLen);
        if (rv != SECSuccess) {
            goto decrypt_loser;
        }

        PRINT_BUF(80, (ss, "cleartext:", plaintext->buf, plaintext->len));

        originalLen = plaintext->len;

        /* If it's a block cipher, check and strip the padding. */
        if (cipher_def->type == type_block) {
            const unsigned int blockSize = cipher_def->block_size;
            const unsigned int macSize = spec->macDef->mac_size;

            if (!isTLS) {
                good &= SECStatusToMask(ssl_RemoveSSLv3CBCPadding(
                    plaintext, blockSize, macSize));
            } else {
                good &= SECStatusToMask(ssl_RemoveTLSCBCPadding(
                    plaintext, macSize));
            }
        }

        /* compute the MAC */
        rv = ssl3_BuildRecordPseudoHeader(
            spec->epoch, cText->seqNum,
            rType, isTLS, rVersion, IS_DTLS(ss),
            plaintext->len - spec->macDef->mac_size, &header);
        PORT_Assert(rv == SECSuccess);
        if (cipher_def->type == type_block) {
            rv = ssl3_ComputeRecordMACConstantTime(
                spec, SSL_BUFFER_BASE(&header), SSL_BUFFER_LEN(&header),
                plaintext->buf, plaintext->len, originalLen,
                hash, &hashBytes);

            ssl_CBCExtractMAC(plaintext, originalLen, givenHashBuf,
                              spec->macDef->mac_size);
            givenHash = givenHashBuf;

            /* plaintext->len will always have enough space to remove the MAC
             * because in ssl_Remove{SSLv3|TLS}CBCPadding we only adjust
             * plaintext->len if the result has enough space for the MAC and we
             * tested the unadjusted size against minLength, above. */
            plaintext->len -= spec->macDef->mac_size;
        } else {
            /* This is safe because we checked the minLength above. */
            plaintext->len -= spec->macDef->mac_size;

            rv = ssl3_ComputeRecordMAC(
                spec, SSL_BUFFER_BASE(&header), SSL_BUFFER_LEN(&header),
                plaintext->buf, plaintext->len, hash, &hashBytes);

            /* We can read the MAC directly from the record because its location
             * is public when a stream cipher is used. */
            givenHash = plaintext->buf + plaintext->len;
        }

        good &= SECStatusToMask(rv);

        if (hashBytes != (unsigned)spec->macDef->mac_size ||
            NSS_SecureMemcmp(givenHash, hash, spec->macDef->mac_size) != 0) {
            /* We're allowed to leak whether or not the MAC check was correct */
            good = 0;
        }
    }

    if (good == 0) {
    decrypt_loser:
        /* always log mac error, in case attacker can read server logs. */
        PORT_SetError(SSL_ERROR_BAD_MAC_READ);
        *alert = bad_record_mac;
        return SECFailure;
    }
    return SECSuccess;
}

SECStatus
ssl3_HandleNonApplicationData(sslSocket *ss, SSLContentType rType,
                              DTLSEpoch epoch, sslSequenceNumber seqNum,
                              sslBuffer *databuf)
{
    SECStatus rv;

    /* check for Token Presence */
    if (!ssl3_ClientAuthTokenPresent(ss->sec.ci.sid)) {
        PORT_SetError(SSL_ERROR_TOKEN_INSERTION_REMOVAL);
        return SECFailure;
    }

    ssl_GetSSL3HandshakeLock(ss);

    /* All the functions called in this switch MUST set error code if
    ** they return SECFailure.
    */
    switch (rType) {
        case ssl_ct_change_cipher_spec:
            rv = ssl3_HandleChangeCipherSpecs(ss, databuf);
            break;
        case ssl_ct_alert:
            rv = ssl3_HandleAlert(ss, databuf);
            break;
        case ssl_ct_handshake:
            if (!IS_DTLS(ss)) {
                rv = ssl3_HandleHandshake(ss, databuf);
            } else {
                rv = dtls_HandleHandshake(ss, epoch, seqNum, databuf);
            }
            break;
        case ssl_ct_ack:
            if (IS_DTLS(ss) && tls13_MaybeTls13(ss)) {
                rv = dtls13_HandleAck(ss, databuf);
                break;
            }
        /* Fall through. */
        default:
            /* If a TLS implementation receives an unexpected record type,
             * it MUST terminate the connection with an "unexpected_message"
             * alert [RFC8446, Section 5].
             *
             * For TLS 1.3 the outer content type is checked before in
             * tls13con.c/tls13_UnprotectRecord(),
             * For DTLS 1.3 the outer content type is checked before in
             * ssl3gthr.c/dtls_GatherData.
             * The inner content types will be checked here.
             *
             * In DTLS generally invalid records SHOULD be silently discarded,
             * no alert is sent [RFC6347, Section 4.1.2.7].
             */
            if (!IS_DTLS(ss)) {
                SSL3_SendAlert(ss, alert_fatal, unexpected_message);
            }
            PORT_SetError(SSL_ERROR_RX_UNKNOWN_RECORD_TYPE);
            SSL_DBG(("%d: SSL3[%d]: bogus content type=%d",
                     SSL_GETPID(), ss->fd, rType));
            rv = SECFailure;
            break;
    }

    ssl_ReleaseSSL3HandshakeLock(ss);
    return rv;
}

/* Find the cipher spec to use for a given record. For TLS, this
 * is the current cipherspec. For DTLS, we look up by epoch.
 * In DTLS < 1.3 this just means the current epoch or nothing,
 * but in DTLS >= 1.3, we keep multiple reading cipherspecs.
 * Returns NULL if no appropriate cipher spec is found.
 */
static ssl3CipherSpec *
ssl3_GetCipherSpec(sslSocket *ss, SSL3Ciphertext *cText)
{
    ssl3CipherSpec *crSpec = ss->ssl3.crSpec;
    ssl3CipherSpec *newSpec = NULL;
    DTLSEpoch epoch;

    if (!IS_DTLS(ss)) {
        return crSpec;
    }
    epoch = dtls_ReadEpoch(crSpec, cText->hdr);
    if (crSpec->epoch == epoch) {
        return crSpec;
    }
    if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        /* Try to find the cipher spec. */
        newSpec = ssl_FindCipherSpecByEpoch(ss, ssl_secret_read,
                                            epoch);
        if (newSpec != NULL) {
            return newSpec;
        }
    }
    SSL_TRC(10, ("%d: DTLS[%d]: Couldn't find cipherspec from epoch %d",
                 SSL_GETPID(), ss->fd, epoch));
    return NULL;
}

/* if cText is non-null, then decipher and check the MAC of the
 * SSL record from cText->buf (typically gs->inbuf)
 * into databuf (typically gs->buf), and any previous contents of databuf
 * is lost.  Then handle databuf according to its SSL record type,
 * unless it's an application record.
 *
 * If cText is NULL, then the ciphertext has previously been deciphered and
 * checked, and is already sitting in databuf.  It is processed as an SSL
 * Handshake message.
 *
 * DOES NOT process the decrypted application data.
 * On return, databuf contains the decrypted record.
 *
 * Called from ssl3_GatherCompleteHandshake
 *             ssl3_RestartHandshakeAfterCertReq
 *
 * Caller must hold the RecvBufLock.
 *
 * This function aquires and releases the SSL3Handshake Lock, holding the
 * lock around any calls to functions that handle records other than
 * Application Data records.
 */
SECStatus
ssl3_HandleRecord(sslSocket *ss, SSL3Ciphertext *cText)
{
    SECStatus rv = SECFailure;
    PRBool isTLS, isTLS13;
    DTLSEpoch epoch;
    ssl3CipherSpec *spec = NULL;
    PRUint16 recordSizeLimit, cTextSizeLimit;
    PRBool outOfOrderSpec = PR_FALSE;
    SSLContentType rType;
    sslBuffer *plaintext = &ss->gs.buf;
    SSL3AlertDescription alert = internal_error;
    PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));

    /* check for Token Presence */
    if (!ssl3_ClientAuthTokenPresent(ss->sec.ci.sid)) {
        PORT_SetError(SSL_ERROR_TOKEN_INSERTION_REMOVAL);
        return SECFailure;
    }

    /* Clear out the buffer in case this exits early.  Any data then won't be
     * processed twice. */
    plaintext->len = 0;

    /* We're waiting for another ClientHello, which will appear unencrypted.
     * Use the content type to tell whether this should be discarded. */
    if (ss->ssl3.hs.zeroRttIgnore == ssl_0rtt_ignore_hrr &&
        cText->hdr[0] == ssl_ct_application_data) {
        PORT_Assert(ss->ssl3.hs.ws == wait_client_hello);
        return SECSuccess;
    }

    ssl_GetSpecReadLock(ss); /******************************************/
    spec = ssl3_GetCipherSpec(ss, cText);
    if (!spec) {
        PORT_Assert(IS_DTLS(ss));
        ssl_ReleaseSpecReadLock(ss); /*****************************/
        return SECSuccess;
    }
    if (spec != ss->ssl3.crSpec) {
        PORT_Assert(IS_DTLS(ss));
        SSL_TRC(3, ("%d: DTLS[%d]: Handling out-of-epoch record from epoch=%d",
                    SSL_GETPID(), ss->fd, spec->epoch));
        outOfOrderSpec = PR_TRUE;
    }
    isTLS = (PRBool)(spec->version > SSL_LIBRARY_VERSION_3_0);
    if (IS_DTLS(ss)) {
        if (dtls13_MaskSequenceNumber(ss, spec, cText->hdr,
                                      SSL_BUFFER_BASE(cText->buf), SSL_BUFFER_LEN(cText->buf)) != SECSuccess) {
            ssl_ReleaseSpecReadLock(ss); /*****************************/
            /* code already set. */
            return SECFailure;
        }
        if (!dtls_IsRelevant(ss, spec, cText, &cText->seqNum)) {
            ssl_ReleaseSpecReadLock(ss); /*****************************/
            return SECSuccess;
        }
    } else {
        cText->seqNum = spec->nextSeqNum;
    }
    if (cText->seqNum >= spec->cipherDef->max_records) {
        ssl_ReleaseSpecReadLock(ss); /*****************************/
        SSL_TRC(3, ("%d: SSL[%d]: read sequence number at limit 0x%0llx",
                    SSL_GETPID(), ss->fd, cText->seqNum));
        PORT_SetError(SSL_ERROR_TOO_MANY_RECORDS);
        return SECFailure;
    }

    isTLS13 = (PRBool)(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
    recordSizeLimit = spec->recordSizeLimit;
    cTextSizeLimit = recordSizeLimit;
    cTextSizeLimit += (isTLS13) ? TLS_1_3_MAX_EXPANSION : TLS_1_2_MAX_EXPANSION;

    /* Check if the specified recordSizeLimit and the RFC8446 specified max
     * expansion are respected. recordSizeLimit is probably at the default for
     * the first (hello) handshake message and then set to a smaller size by
     * the Record Size Limit Extension.
     * Stricter expansion size checks dependent on implemented cipher suites
     * are performed in ssl3con.c/ssl3_UnprotectRecord() OR
     * tls13con.c/tls13_UnprotextRecord().
     * After Decryption the plaintext size is checked (l. 13424). This also
     * applies to unencrypted records. */
    if (cText->buf->len > cTextSizeLimit) {
        ssl_ReleaseSpecReadLock(ss); /*****************************/
        /* Drop DTLS Record Errors silently [RFC6347, Section 4.1.2.7] */
        if (IS_DTLS(ss)) {
            return SECSuccess;
        }
        SSL3_SendAlert(ss, alert_fatal, record_overflow);
        PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
        return SECFailure;
    }

#ifdef DEBUG
    /* In debug builds the gather buffers are freed after the handling of each
     * record for advanced ASAN coverage. Allocate the buffer again to the
     * maximum possibly needed size as on gather initialization in
     * ssl3gthr.c/ssl3_InitGather(). */
    PR_ASSERT(sslBuffer_Grow(plaintext, TLS_1_2_MAX_CTEXT_LENGTH) == SECSuccess);
#endif
    /* This replaces a dynamic plaintext buffer size check, since the buffer is
     * allocated to the maximum size in ssl3gthr.c/ssl3_InitGather(). The buffer
     * was always grown to the maximum size at first record gathering before. */
    PR_ASSERT(plaintext->space >= cTextSizeLimit);

    /* Most record types aside from protected TLS 1.3 records carry the content
     * type in the first octet. TLS 1.3 will override this value later. */
    rType = cText->hdr[0];
    /* Encrypted application data records could arrive before the handshake
     * completes in DTLS 1.3. These can look like valid TLS 1.2 application_data
     * records in epoch 0, which is never valid. Pretend they didn't decrypt. */
    if (spec->epoch == 0 && ((IS_DTLS(ss) &&
                              dtls_IsDtls13Ciphertext(0, rType)) ||
                             rType == ssl_ct_application_data)) {
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_APPLICATION_DATA);
        alert = unexpected_message;
        rv = SECFailure;
    } else {
#ifdef UNSAFE_FUZZER_MODE
        rv = Null_Cipher(NULL, plaintext->buf, &plaintext->len,
                         plaintext->space, cText->buf->buf, cText->buf->len);
#else
        /* IMPORTANT:
         * Unprotect functions MUST NOT send alerts
         * because we still hold the spec read lock. Instead, if they
         * return SECFailure, they set *alert to the alert to be sent.
         * Additionaly, this is used to silently drop DTLS encryption/record
         * errors/alerts using the error handling below as suggested in the
         * DTLS specification [RFC6347, Section 4.1.2.7]. */
        if (spec->cipherDef->cipher == cipher_null && cText->buf->len == 0) {
            /* Handle a zero-length unprotected record
             * In this case, we treat it as a no-op and let later functions decide
             * whether to ignore or alert accordingly. */
            PR_ASSERT(plaintext->len == 0);
            rv = SECSuccess;
        } else if (spec->version < SSL_LIBRARY_VERSION_TLS_1_3 || spec->epoch == 0) {
            rv = ssl3_UnprotectRecord(ss, spec, cText, plaintext, &alert);
        } else {
            rv = tls13_UnprotectRecord(ss, spec, cText, plaintext, &rType,
                                       &alert);
        }
#endif
    }

    /* Error/Alert handling for ssl3/tls13_UnprotectRecord */
    if (rv != SECSuccess) {
        ssl_ReleaseSpecReadLock(ss); /***************************/

        SSL_DBG(("%d: SSL3[%d]: decryption failed", SSL_GETPID(), ss->fd));

        /* Ensure that we don't process this data again. */
        plaintext->len = 0;

        /* Ignore a CCS if compatibility mode is negotiated.  Note that this
         * will fail if the server fails to negotiate compatibility mode in a
         * 0-RTT session that is resumed from a session that did negotiate it.
         * We don't care about that corner case right now. */
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
            cText->hdr[0] == ssl_ct_change_cipher_spec &&
            ss->ssl3.hs.ws != idle_handshake &&
            cText->buf->len == 1 &&
            cText->buf->buf[0] == change_cipher_spec_choice) {
            if (!ss->ssl3.hs.rejectCcs) {
                /* Allow only the first CCS. */
                ss->ssl3.hs.rejectCcs = PR_TRUE;
                return SECSuccess;
            } else {
                alert = unexpected_message;
                PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
            }
        }

        /* All errors/alerts that might occur during unprotection are related
         * to invalid records (e.g. invalid formatting, length, MAC, ...).
         * Following the DTLS specification such errors/alerts SHOULD be
         * dropped silently [RFC6347, Section 4.1.2.7].
         * This is done below. */
        if ((IS_DTLS(ss) && !dtls13_AeadLimitReached(spec)) ||
            (!IS_DTLS(ss) && ss->sec.isServer &&
             ss->ssl3.hs.zeroRttIgnore == ssl_0rtt_ignore_trial)) {
            /* Silently drop the packet unless we set ss->ssl3.fatalAlertSent.
             * (Manually or by using functions like
             * SSL3_SendAlert(.., alert_fatal,..))
             * This is not currently used in the unprotection functions since
             * all TLS and DTLS errors are propagated to this handler. */
            if (ss->ssl3.fatalAlertSent) {
                return SECFailure;
            }
            return SECSuccess;
        }

        int errCode = PORT_GetError();
        SSL3_SendAlert(ss, alert_fatal, alert);
        /* Reset the error code in case SSL3_SendAlert called
         * PORT_SetError(). */
        PORT_SetError(errCode);
        return SECFailure;
    }

    /* SECSuccess */
    if (IS_DTLS(ss)) {
        dtls_RecordSetRecvd(&spec->recvdRecords, cText->seqNum);
        spec->nextSeqNum = PR_MAX(spec->nextSeqNum, cText->seqNum + 1);
    } else {
        ++spec->nextSeqNum;
    }
    epoch = spec->epoch;

    ssl_ReleaseSpecReadLock(ss); /*****************************************/

    /*
     * The decrypted data is now in plaintext.
     */

    /* IMPORTANT: We are in DTLS 1.3 mode and we have processed something
     * from the wrong epoch. Divert to a divert processing function to make
     * sure we don't accidentally use the data unsafely. */
    if (outOfOrderSpec) {
        PORT_Assert(IS_DTLS(ss) && ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
        return dtls13_HandleOutOfEpochRecord(ss, spec, rType, plaintext);
    }

    /* Check the length of the plaintext. */
    if (isTLS && plaintext->len > recordSizeLimit) {
        plaintext->len = 0;
        /* Drop DTLS Record Errors silently [RFC6347, Section 4.1.2.7] */
        if (IS_DTLS(ss)) {
            return SECSuccess;
        }
        SSL3_SendAlert(ss, alert_fatal, record_overflow);
        PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
        return SECFailure;
    }

    /* Application data records are processed by the caller of this
    ** function, not by this function.
    */
    if (rType == ssl_ct_application_data) {
        if (ss->firstHsDone)
            return SECSuccess;
        if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3 &&
            ss->sec.isServer &&
            ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted) {
            return tls13_HandleEarlyApplicationData(ss, plaintext);
        }
        plaintext->len = 0;
        (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
        PORT_SetError(SSL_ERROR_RX_UNEXPECTED_APPLICATION_DATA);
        return SECFailure;
    }

    rv = ssl3_HandleNonApplicationData(ss, rType, epoch, cText->seqNum,
                                       plaintext);

#ifdef DEBUG
    /* In Debug builds free and zero gather plaintext buffer after its content
     * has been used/copied for advanced ASAN coverage/utilization.
     * This frees buffer for non application data records, for application data
     * records it is freed in sslsecur.c/DoRecv(). */
    sslBuffer_Clear(&ss->gs.buf);
#endif

    return rv;
}

/*
 * Initialization functions
 */

void
ssl_InitSecState(sslSecurityInfo *sec)
{
    sec->authType = ssl_auth_null;
    sec->authKeyBits = 0;
    sec->signatureScheme = ssl_sig_none;
    sec->keaType = ssl_kea_null;
    sec->keaKeyBits = 0;
    sec->keaGroup = NULL;
}

SECStatus
ssl3_InitState(sslSocket *ss)
{
    SECStatus rv;

    ss->ssl3.policy = SSL_ALLOWED;

    ssl_InitSecState(&ss->sec);

    ssl_GetSpecWriteLock(ss);
    PR_INIT_CLIST(&ss->ssl3.hs.cipherSpecs);
    rv = ssl_SetupNullCipherSpec(ss, ssl_secret_read);
    rv |= ssl_SetupNullCipherSpec(ss, ssl_secret_write);
    ss->ssl3.pwSpec = ss->ssl3.prSpec = NULL;
    ssl_ReleaseSpecWriteLock(ss);
    if (rv != SECSuccess) {
        /* Rely on ssl_CreateNullCipherSpec() to set error code. */
        return SECFailure;
    }

    ss->ssl3.hs.sendingSCSV = PR_FALSE;
    ss->ssl3.hs.preliminaryInfo = 0;
    ss->ssl3.hs.ws = (ss->sec.isServer) ? wait_client_hello : idle_handshake;

    ssl3_ResetExtensionData(&ss->xtnData, ss);
    PR_INIT_CLIST(&ss->ssl3.hs.remoteExtensions);
    PR_INIT_CLIST(&ss->ssl3.hs.echOuterExtensions);
    if (IS_DTLS(ss)) {
        ss->ssl3.hs.sendMessageSeq = 0;
        ss->ssl3.hs.recvMessageSeq = 0;
        ss->ssl3.hs.rtTimer->timeout = DTLS_RETRANSMIT_INITIAL_MS;
        ss->ssl3.hs.rtRetries = 0;
        ss->ssl3.hs.recvdHighWater = -1;
        PR_INIT_CLIST(&ss->ssl3.hs.lastMessageFlight);
        dtls_SetMTU(ss, 0); /* Set the MTU to the highest plateau */
    }

    ss->ssl3.hs.currentSecret = NULL;
    ss->ssl3.hs.resumptionMasterSecret = NULL;
    ss->ssl3.hs.dheSecret = NULL;
    ss->ssl3.hs.clientEarlyTrafficSecret = NULL;
    ss->ssl3.hs.clientHsTrafficSecret = NULL;
    ss->ssl3.hs.serverHsTrafficSecret = NULL;
    ss->ssl3.hs.clientTrafficSecret = NULL;
    ss->ssl3.hs.serverTrafficSecret = NULL;
    ss->ssl3.hs.echHpkeCtx = NULL;
    ss->ssl3.hs.greaseEchSize = 100;
    ss->ssl3.hs.echAccepted = PR_FALSE;
    ss->ssl3.hs.echDecided = PR_FALSE;

    ss->ssl3.hs.clientAuthSignatureSchemes = NULL;
    ss->ssl3.hs.clientAuthSignatureSchemesLen = 0;

    PORT_Assert(!ss->ssl3.hs.messages.buf && !ss->ssl3.hs.messages.space);
    ss->ssl3.hs.messages.buf = NULL;
    ss->ssl3.hs.messages.space = 0;

    ss->ssl3.hs.receivedNewSessionTicket = PR_FALSE;
    PORT_Memset(&ss->ssl3.hs.newSessionTicket, 0,
                sizeof(ss->ssl3.hs.newSessionTicket));

    ss->ssl3.hs.zeroRttState = ssl_0rtt_none;

    return SECSuccess;
}

/* record the export policy for this cipher suite */
SECStatus
ssl3_SetPolicy(ssl3CipherSuite which, int policy)
{
    ssl3CipherSuiteCfg *suite;

    suite = ssl_LookupCipherSuiteCfgMutable(which, cipherSuites);
    if (suite == NULL) {
        return SECFailure; /* err code was set by ssl_LookupCipherSuiteCfg */
    }
    suite->policy = policy;

    return SECSuccess;
}

SECStatus
ssl3_GetPolicy(ssl3CipherSuite which, PRInt32 *oPolicy)
{
    const ssl3CipherSuiteCfg *suite;
    PRInt32 policy;
    SECStatus rv;

    suite = ssl_LookupCipherSuiteCfg(which, cipherSuites);
    if (suite) {
        policy = suite->policy;
        rv = SECSuccess;
    } else {
        policy = SSL_NOT_ALLOWED;
        rv = SECFailure; /* err code was set by Lookup. */
    }
    *oPolicy = policy;
    return rv;
}

/* record the user preference for this suite */
SECStatus
ssl3_CipherPrefSetDefault(ssl3CipherSuite which, PRBool enabled)
{
    ssl3CipherSuiteCfg *suite;

    suite = ssl_LookupCipherSuiteCfgMutable(which, cipherSuites);
    if (suite == NULL) {
        return SECFailure; /* err code was set by ssl_LookupCipherSuiteCfg */
    }
    suite->enabled = enabled;
    return SECSuccess;
}

/* return the user preference for this suite */
SECStatus
ssl3_CipherPrefGetDefault(ssl3CipherSuite which, PRBool *enabled)
{
    const ssl3CipherSuiteCfg *suite;
    PRBool pref;
    SECStatus rv;

    suite = ssl_LookupCipherSuiteCfg(which, cipherSuites);
    if (suite) {
        pref = suite->enabled;
        rv = SECSuccess;
    } else {
        pref = SSL_NOT_ALLOWED;
        rv = SECFailure; /* err code was set by Lookup. */
    }
    *enabled = pref;
    return rv;
}

SECStatus
ssl3_CipherPrefSet(sslSocket *ss, ssl3CipherSuite which, PRBool enabled)
{
    ssl3CipherSuiteCfg *suite;

    suite = ssl_LookupCipherSuiteCfgMutable(which, ss->cipherSuites);
    if (suite == NULL) {
        return SECFailure; /* err code was set by ssl_LookupCipherSuiteCfg */
    }
    suite->enabled = enabled;
    return SECSuccess;
}

SECStatus
ssl3_CipherPrefGet(const sslSocket *ss, ssl3CipherSuite which, PRBool *enabled)
{
    const ssl3CipherSuiteCfg *suite;
    PRBool pref;
    SECStatus rv;

    suite = ssl_LookupCipherSuiteCfg(which, ss->cipherSuites);
    if (suite) {
        pref = suite->enabled;
        rv = SECSuccess;
    } else {
        pref = SSL_NOT_ALLOWED;
        rv = SECFailure; /* err code was set by Lookup. */
    }
    *enabled = pref;
    return rv;
}

SECStatus
SSL_SignatureSchemePrefSet(PRFileDesc *fd, const SSLSignatureScheme *schemes,
                           unsigned int count)
{
    sslSocket *ss;
    unsigned int i;
    unsigned int supported = 0;

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_SignatureSchemePrefSet",
                 SSL_GETPID(), fd));
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    if (!count) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    for (i = 0; i < count; ++i) {
        if (ssl_IsSupportedSignatureScheme(schemes[i])) {
            ++supported;
        }
    }
    /* We don't check for duplicates, so it's possible to get too many. */
    if (supported > MAX_SIGNATURE_SCHEMES) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    ss->ssl3.signatureSchemeCount = 0;
    for (i = 0; i < count; ++i) {
        if (!ssl_IsSupportedSignatureScheme(schemes[i])) {
            SSL_DBG(("%d: SSL[%d]: invalid signature scheme %d ignored",
                     SSL_GETPID(), fd, schemes[i]));
            continue;
        }

        ss->ssl3.signatureSchemes[ss->ssl3.signatureSchemeCount++] = schemes[i];
    }

    if (ss->ssl3.signatureSchemeCount == 0) {
        PORT_SetError(SSL_ERROR_NO_SUPPORTED_SIGNATURE_ALGORITHM);
        return SECFailure;
    }
    return SECSuccess;
}

SECStatus
SSL_SignaturePrefSet(PRFileDesc *fd, const SSLSignatureAndHashAlg *algorithms,
                     unsigned int count)
{
    SSLSignatureScheme schemes[MAX_SIGNATURE_SCHEMES];
    unsigned int i;

    count = PR_MIN(PR_ARRAY_SIZE(schemes), count);
    for (i = 0; i < count; ++i) {
        schemes[i] = (algorithms[i].hashAlg << 8) | algorithms[i].sigAlg;
    }
    return SSL_SignatureSchemePrefSet(fd, schemes, count);
}

SECStatus
SSL_SignatureSchemePrefGet(PRFileDesc *fd, SSLSignatureScheme *schemes,
                           unsigned int *count, unsigned int maxCount)
{
    sslSocket *ss;

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_SignatureSchemePrefGet",
                 SSL_GETPID(), fd));
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    if (!schemes || !count ||
        maxCount < ss->ssl3.signatureSchemeCount) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    PORT_Memcpy(schemes, ss->ssl3.signatureSchemes,
                ss->ssl3.signatureSchemeCount * sizeof(SSLSignatureScheme));
    *count = ss->ssl3.signatureSchemeCount;
    return SECSuccess;
}

SECStatus
SSL_SignaturePrefGet(PRFileDesc *fd, SSLSignatureAndHashAlg *algorithms,
                     unsigned int *count, unsigned int maxCount)
{
    sslSocket *ss;
    unsigned int i;

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_SignaturePrefGet",
                 SSL_GETPID(), fd));
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    if (!algorithms || !count ||
        maxCount < ss->ssl3.signatureSchemeCount) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    for (i = 0; i < ss->ssl3.signatureSchemeCount; ++i) {
        algorithms[i].hashAlg = (ss->ssl3.signatureSchemes[i] >> 8) & 0xff;
        algorithms[i].sigAlg = ss->ssl3.signatureSchemes[i] & 0xff;
    }
    *count = ss->ssl3.signatureSchemeCount;
    return SECSuccess;
}

unsigned int
SSL_SignatureMaxCount(void)
{
    return MAX_SIGNATURE_SCHEMES;
}

/* copy global default policy into socket. */
void
ssl3_InitSocketPolicy(sslSocket *ss)
{
    PORT_Memcpy(ss->cipherSuites, cipherSuites, sizeof(cipherSuites));
    PORT_Memcpy(ss->ssl3.signatureSchemes, defaultSignatureSchemes,
                sizeof(defaultSignatureSchemes));
    ss->ssl3.signatureSchemeCount = PR_ARRAY_SIZE(defaultSignatureSchemes);
}

/*
** If ssl3 socket has completed the first handshake, and is in idle state,
** then start a new handshake.
** If flushCache is true, the SID cache will be flushed first, forcing a
** "Full" handshake (not a session restart handshake), to be done.
**
** called from SSL_RedoHandshake(), which already holds the handshake locks.
*/
SECStatus
ssl3_RedoHandshake(sslSocket *ss, PRBool flushCache)
{
    sslSessionID *sid = ss->sec.ci.sid;
    SECStatus rv;

    PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));

    if (!ss->firstHsDone || (ss->ssl3.hs.ws != idle_handshake)) {
        PORT_SetError(SSL_ERROR_HANDSHAKE_NOT_COMPLETED);
        return SECFailure;
    }

    if (IS_DTLS(ss)) {
        dtls_RehandshakeCleanup(ss);
    }

    if (ss->opt.enableRenegotiation == SSL_RENEGOTIATE_NEVER ||
        ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
        PORT_SetError(SSL_ERROR_RENEGOTIATION_NOT_ALLOWED);
        return SECFailure;
    }
    if (ss->version > ss->vrange.max || ss->version < ss->vrange.min) {
        PORT_SetError(SSL_ERROR_UNSUPPORTED_VERSION);
        return SECFailure;
    }

    if (sid && flushCache) {
        ssl_UncacheSessionID(ss); /* remove it from whichever cache it's in. */
        ssl_FreeSID(sid);         /* dec ref count and free if zero. */
        ss->sec.ci.sid = NULL;
    }

    ssl_GetXmitBufLock(ss); /**************************************/

    /* start off a new handshake. */
    if (ss->sec.isServer) {
        rv = ssl3_SendHelloRequest(ss);
    } else {
        rv = ssl3_SendClientHello(ss, client_hello_renegotiation);
    }

    ssl_ReleaseXmitBufLock(ss); /**************************************/
    return rv;
}

/* Called from ssl_DestroySocketContents() in sslsock.c */
void
ssl3_DestroySSL3Info(sslSocket *ss)
{

    if (ss->ssl3.clientCertificate != NULL)
        CERT_DestroyCertificate(ss->ssl3.clientCertificate);

    if (ss->ssl3.clientPrivateKey != NULL)
        SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey);

    if (ss->ssl3.hs.clientAuthSignatureSchemes != NULL) {
        PORT_Free(ss->ssl3.hs.clientAuthSignatureSchemes);
        ss->ssl3.hs.clientAuthSignatureSchemes = NULL;
        ss->ssl3.hs.clientAuthSignatureSchemesLen = 0;
    }

    if (ss->ssl3.peerCertArena != NULL)
        ssl3_CleanupPeerCerts(ss);

    if (ss->ssl3.clientCertChain != NULL) {
        CERT_DestroyCertificateList(ss->ssl3.clientCertChain);
        ss->ssl3.clientCertChain = NULL;
    }
    if (ss->ssl3.ca_list) {
        CERT_FreeDistNames(ss->ssl3.ca_list);
    }

    /* clean up handshake */
    if (ss->ssl3.hs.md5) {
        PK11_DestroyContext(ss->ssl3.hs.md5, PR_TRUE);
    }
    if (ss->ssl3.hs.sha) {
        PK11_DestroyContext(ss->ssl3.hs.sha, PR_TRUE);
    }
    if (ss->ssl3.hs.shaEchInner) {
        PK11_DestroyContext(ss->ssl3.hs.shaEchInner, PR_TRUE);
    }
    if (ss->ssl3.hs.shaPostHandshake) {
        PK11_DestroyContext(ss->ssl3.hs.shaPostHandshake, PR_TRUE);
    }
    if (ss->ssl3.hs.messages.buf) {
        sslBuffer_Clear(&ss->ssl3.hs.messages);
    }
    if (ss->ssl3.hs.echInnerMessages.buf) {
        sslBuffer_Clear(&ss->ssl3.hs.echInnerMessages);
    }

    /* free the SSL3Buffer (msg_body) */
    PORT_Free(ss->ssl3.hs.msg_body.buf);

    SECITEM_FreeItem(&ss->ssl3.hs.newSessionTicket.ticket, PR_FALSE);
    SECITEM_FreeItem(&ss->ssl3.hs.srvVirtName, PR_FALSE);
    SECITEM_FreeItem(&ss->ssl3.hs.fakeSid, PR_FALSE);

    /* Destroy the DTLS data */
    if (IS_DTLS(ss)) {
        dtls_FreeHandshakeMessages(&ss->ssl3.hs.lastMessageFlight);
        if (ss->ssl3.hs.recvdFragments.buf) {
            PORT_Free(ss->ssl3.hs.recvdFragments.buf);
        }
    }

    /* Destroy remote extensions */
    ssl3_DestroyRemoteExtensions(&ss->ssl3.hs.remoteExtensions);
    ssl3_DestroyRemoteExtensions(&ss->ssl3.hs.echOuterExtensions);
    ssl3_DestroyExtensionData(&ss->xtnData);

    /* Destroy cipher specs */
    ssl_DestroyCipherSpecs(&ss->ssl3.hs.cipherSpecs);

    /* Destroy TLS 1.3 keys */
    if (ss->ssl3.hs.currentSecret)
        PK11_FreeSymKey(ss->ssl3.hs.currentSecret);
    if (ss->ssl3.hs.resumptionMasterSecret)
        PK11_FreeSymKey(ss->ssl3.hs.resumptionMasterSecret);
    if (ss->ssl3.hs.dheSecret)
        PK11_FreeSymKey(ss->ssl3.hs.dheSecret);
    if (ss->ssl3.hs.clientEarlyTrafficSecret)
        PK11_FreeSymKey(ss->ssl3.hs.clientEarlyTrafficSecret);
    if (ss->ssl3.hs.clientHsTrafficSecret)
        PK11_FreeSymKey(ss->ssl3.hs.clientHsTrafficSecret);
    if (ss->ssl3.hs.serverHsTrafficSecret)
        PK11_FreeSymKey(ss->ssl3.hs.serverHsTrafficSecret);
    if (ss->ssl3.hs.clientTrafficSecret)
        PK11_FreeSymKey(ss->ssl3.hs.clientTrafficSecret);
    if (ss->ssl3.hs.serverTrafficSecret)
        PK11_FreeSymKey(ss->ssl3.hs.serverTrafficSecret);
    if (ss->ssl3.hs.earlyExporterSecret)
        PK11_FreeSymKey(ss->ssl3.hs.earlyExporterSecret);
    if (ss->ssl3.hs.exporterSecret)
        PK11_FreeSymKey(ss->ssl3.hs.exporterSecret);

    ss->ssl3.hs.zeroRttState = ssl_0rtt_none;
    /* Destroy TLS 1.3 buffered early data. */
    tls13_DestroyEarlyData(&ss->ssl3.hs.bufferedEarlyData);

    /* Destroy TLS 1.3 PSKs. */
    tls13_DestroyPskList(&ss->ssl3.hs.psks);

    /* TLS 1.3 ECH state. */
    PK11_HPKE_DestroyContext(ss->ssl3.hs.echHpkeCtx, PR_TRUE);
    PORT_Free((void *)ss->ssl3.hs.echPublicName); /* CONST */
    sslBuffer_Clear(&ss->ssl3.hs.greaseEchBuf);

    /* TLS 1.3 GREASE (client) state. */
    tls13_ClientGreaseDestroy(ss);

    /* TLS ClientHello Extension Permutation state. */
    tls_ClientHelloExtensionPermutationDestroy(ss);
}

/* check if the current cipher spec is FIPS. We only need to
 * check the contexts here, if the kea, prf or keys were not FIPS,
 * that status would have been rolled up in the create context
 * call */
static PRBool
ssl_cipherSpecIsFips(ssl3CipherSpec *spec)
{
    if (!spec || !spec->cipherDef) {
        return PR_FALSE;
    }

    if (spec->cipherDef->type != type_aead) {
        if (spec->keyMaterial.macContext == NULL) {
            return PR_FALSE;
        }
        if (!PK11_ContextGetFIPSStatus(spec->keyMaterial.macContext)) {
            return PR_FALSE;
        }
    }
    if (!spec->cipherContext) {
        return PR_FALSE;
    }
    return PK11_ContextGetFIPSStatus(spec->cipherContext);
}

/* return true if the current operation is running in FIPS mode */
PRBool
ssl_isFIPS(sslSocket *ss)
{
    if (!ssl_cipherSpecIsFips(ss->ssl3.crSpec)) {
        return PR_FALSE;
    }
    return ssl_cipherSpecIsFips(ss->ssl3.cwSpec);
}

/*
 * parse the policy value for a single algorithm in a cipher_suite,
 *   return TRUE if we disallow by the cipher suite by policy
 *   (we don't have to parse any more algorithm policies on this cipher suite),
 *  otherwise return FALSE.
 *   1. If we don't have the required policy, disable by default, disallow by
 *      policy and return TRUE (no more processing needed).
 *   2. If we have the required policy, and we are disabled, return FALSE,
 *      (if we are disabled, we only need to parse policy, not default).
 *   3. If we have the required policy, and we aren't adjusting the defaults
 *      return FALSE. (only parsing the policy, not default).
 *   4. We have the required policy and we are adjusting the defaults.
 *      If we are setting default = FALSE, set isDisabled to true so that
 *      we don't try to re-enable the cipher suite based on a different
 *      algorithm.
 */
PRBool
ssl_HandlePolicy(int cipher_suite, SECOidTag policyOid,
                 PRUint32 requiredPolicy, PRBool *isDisabled)
{
    PRUint32 policy;
    SECStatus rv;

    /* first fetch the policy for this algorithm */
    rv = NSS_GetAlgorithmPolicy(policyOid, &policy);
    if (rv != SECSuccess) {
        return PR_FALSE; /* no policy value, continue to the next algorithm */
    }
    /* first, are we allowed by policy, if not turn off allow and disable */
    if (!(policy & requiredPolicy)) {
        ssl_CipherPrefSetDefault(cipher_suite, PR_FALSE);
        ssl_CipherPolicySet(cipher_suite, SSL_NOT_ALLOWED);
        return PR_TRUE;
    }
    /* If we are already disabled, or the policy isn't setting a default
     * we are done processing this algorithm */
    if (*isDisabled || (policy & NSS_USE_DEFAULT_NOT_VALID)) {
        return PR_FALSE;
    }
    /* set the default value for the cipher suite. If we disable the cipher
     * suite, remember that so we don't process the next default. This has
     * the effect of disabling the whole cipher suite if any of the
     * algorithms it uses are disabled by default. We still have to
     * process the upper level because the cipher suite is still allowed
     * by policy, and we may still have to disallow it based on other
     * algorithms in the cipher suite. */
    if (policy & NSS_USE_DEFAULT_SSL_ENABLE) {
        ssl_CipherPrefSetDefault(cipher_suite, PR_TRUE);
    } else {
        *isDisabled = PR_TRUE;
        ssl_CipherPrefSetDefault(cipher_suite, PR_FALSE);
    }
    return PR_FALSE;
}

#define MAP_NULL(x) (((x) != 0) ? (x) : SEC_OID_NULL_CIPHER)

SECStatus
ssl3_ApplyNSSPolicy(void)
{
    unsigned i;
    SECStatus rv;
    PRUint32 policy = 0;

    rv = NSS_GetAlgorithmPolicy(SEC_OID_APPLY_SSL_POLICY, &policy);
    if (rv != SECSuccess || !(policy & NSS_USE_POLICY_IN_SSL)) {
        return SECSuccess; /* do nothing */
    }

    /* disable every ciphersuite */
    for (i = 1; i < PR_ARRAY_SIZE(cipher_suite_defs); ++i) {
        const ssl3CipherSuiteDef *suite = &cipher_suite_defs[i];
        SECOidTag policyOid;
        PRBool isDisabled = PR_FALSE;

        /* if we haven't explicitly disabled it below enable by policy */
        ssl_CipherPolicySet(suite->cipher_suite, SSL_ALLOWED);

        /* now check the various key exchange, ciphers and macs and
         * if we ever disallow by policy, we are done, go to the next cipher
         */
        policyOid = MAP_NULL(kea_defs[suite->key_exchange_alg].oid);
        if (ssl_HandlePolicy(suite->cipher_suite, policyOid,
                             NSS_USE_ALG_IN_SSL_KX, &isDisabled)) {
            continue;
        }

        policyOid = MAP_NULL(ssl_GetBulkCipherDef(suite)->oid);
        if (ssl_HandlePolicy(suite->cipher_suite, policyOid,
                             NSS_USE_ALG_IN_SSL, &isDisabled)) {
            continue;
        }

        if (ssl_GetBulkCipherDef(suite)->type != type_aead) {
            policyOid = MAP_NULL(ssl_GetMacDefByAlg(suite->mac_alg)->oid);
            if (ssl_HandlePolicy(suite->cipher_suite, policyOid,
                                 NSS_USE_ALG_IN_SSL, &isDisabled)) {
                continue;
            }
        }
    }

    rv = ssl3_ConstrainRangeByPolicy();

    return rv;
}

/* End of ssl3con.c */