diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/x509/pkcs7-crypt.c | 1793 |
1 files changed, 1793 insertions, 0 deletions
diff --git a/lib/x509/pkcs7-crypt.c b/lib/x509/pkcs7-crypt.c new file mode 100644 index 0000000..59eddcd --- /dev/null +++ b/lib/x509/pkcs7-crypt.c @@ -0,0 +1,1793 @@ +/* + * Copyright (C) 2003-2016 Free Software Foundation, Inc. + * Copyright (C) 2014-2016 Red Hat + * Copyright (C) 2014-2016 Nikos Mavrogiannopoulos + * + * Author: Nikos Mavrogiannopoulos + * + * This file is part of GnuTLS. + * + * The GnuTLS is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/> + * + */ + +#include "gnutls_int.h" + +#include <datum.h> +#include <global.h> +#include "errors.h" +#include <common.h> +#include <x509.h> +#include <x509_b64.h> +#include "x509_int.h" +#include "pkcs7_int.h" +#include <algorithms.h> +#include <num.h> +#include <random.h> +#include <pk.h> + +#define PBES1_DES_MD5_OID "1.2.840.113549.1.5.3" + +#define PBES2_OID "1.2.840.113549.1.5.13" +#define PBKDF2_OID "1.2.840.113549.1.5.12" +#define DES_EDE3_CBC_OID "1.2.840.113549.3.7" +#define AES_128_CBC_OID "2.16.840.1.101.3.4.1.2" +#define AES_192_CBC_OID "2.16.840.1.101.3.4.1.22" +#define AES_256_CBC_OID "2.16.840.1.101.3.4.1.42" +#define DES_CBC_OID "1.3.14.3.2.7" + +/* oid_pbeWithSHAAnd3_KeyTripleDES_CBC */ +#define PKCS12_PBE_3DES_SHA1_OID "1.2.840.113549.1.12.1.3" +#define PKCS12_PBE_ARCFOUR_SHA1_OID "1.2.840.113549.1.12.1.1" +#define PKCS12_PBE_RC2_40_SHA1_OID "1.2.840.113549.1.12.1.6" + +static const struct pkcs_cipher_schema_st avail_pkcs_cipher_schemas[] = { + { + .schema = PBES1_DES_MD5, + .name = "PBES1-DES-CBC-MD5", + .flag = GNUTLS_PKCS_PBES1_DES_MD5, + .cipher = GNUTLS_CIPHER_DES_CBC, + .pbes2 = 0, + .cipher_oid = PBES1_DES_MD5_OID, + .write_oid = PBES1_DES_MD5_OID, + .desc = NULL, + .iv_name = NULL, + .decrypt_only = 1}, + { + .schema = PBES2_3DES, + .name = "PBES2-3DES-CBC", + .flag = GNUTLS_PKCS_PBES2_3DES, + .cipher = GNUTLS_CIPHER_3DES_CBC, + .pbes2 = 1, + .cipher_oid = DES_EDE3_CBC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.pkcs-5-des-EDE3-CBC-params", + .iv_name = "", + .decrypt_only = 0}, + { + .schema = PBES2_DES, + .name = "PBES2-DES-CBC", + .flag = GNUTLS_PKCS_PBES2_DES, + .cipher = GNUTLS_CIPHER_DES_CBC, + .pbes2 = 1, + .cipher_oid = DES_CBC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.pkcs-5-des-CBC-params", + .iv_name = "", + .decrypt_only = 0}, + { + .schema = PBES2_AES_128, + .name = "PBES2-AES128-CBC", + .flag = GNUTLS_PKCS_PBES2_AES_128, + .cipher = GNUTLS_CIPHER_AES_128_CBC, + .pbes2 = 1, + .cipher_oid = AES_128_CBC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.pkcs-5-aes128-CBC-params", + .iv_name = "", + .decrypt_only = 0}, + { + .schema = PBES2_AES_192, + .name = "PBES2-AES192-CBC", + .flag = GNUTLS_PKCS_PBES2_AES_192, + .cipher = GNUTLS_CIPHER_AES_192_CBC, + .pbes2 = 1, + .cipher_oid = AES_192_CBC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.pkcs-5-aes192-CBC-params", + .iv_name = "", + .decrypt_only = 0}, + { + .schema = PBES2_AES_256, + .name = "PBES2-AES256-CBC", + .flag = GNUTLS_PKCS_PBES2_AES_256, + .cipher = GNUTLS_CIPHER_AES_256_CBC, + .pbes2 = 1, + .cipher_oid = AES_256_CBC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.pkcs-5-aes256-CBC-params", + .iv_name = "", + .decrypt_only = 0}, + { + .schema = PBES2_GOST28147_89_TC26Z, + .name = "PBES2-GOST28147-89-TC26Z", + .flag = GNUTLS_PKCS_PBES2_GOST_TC26Z, + .cipher = GNUTLS_CIPHER_GOST28147_TC26Z_CFB, + .pbes2 = 1, + .cipher_oid = GOST28147_89_TC26Z_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.Gost28147-89-Parameters", + .iv_name = "iv", + .decrypt_only = 0}, + { + .schema = PBES2_GOST28147_89_CPA, + .name = "PBES2-GOST28147-89-CPA", + .flag = GNUTLS_PKCS_PBES2_GOST_CPA, + .cipher = GNUTLS_CIPHER_GOST28147_CPA_CFB, + .pbes2 = 1, + .cipher_oid = GOST28147_89_CPA_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.Gost28147-89-Parameters", + .iv_name = "iv", + .decrypt_only = 0}, + { + .schema = PBES2_GOST28147_89_CPB, + .name = "PBES2-GOST28147-89-CPB", + .flag = GNUTLS_PKCS_PBES2_GOST_CPB, + .cipher = GNUTLS_CIPHER_GOST28147_CPB_CFB, + .pbes2 = 1, + .cipher_oid = GOST28147_89_CPB_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.Gost28147-89-Parameters", + .iv_name = "iv", + .decrypt_only = 0}, + { + .schema = PBES2_GOST28147_89_CPC, + .name = "PBES2-GOST28147-89-CPC", + .flag = GNUTLS_PKCS_PBES2_GOST_CPC, + .cipher = GNUTLS_CIPHER_GOST28147_CPC_CFB, + .pbes2 = 1, + .cipher_oid = GOST28147_89_CPC_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.Gost28147-89-Parameters", + .iv_name = "iv", + .decrypt_only = 0}, + { + .schema = PBES2_GOST28147_89_CPD, + .name = "PBES2-GOST28147-89-CPD", + .flag = GNUTLS_PKCS_PBES2_GOST_CPD, + .cipher = GNUTLS_CIPHER_GOST28147_CPD_CFB, + .pbes2 = 1, + .cipher_oid = GOST28147_89_CPD_OID, + .write_oid = PBES2_OID, + .desc = "PKIX1.Gost28147-89-Parameters", + .iv_name = "iv", + .decrypt_only = 0}, + { + .schema = PKCS12_ARCFOUR_SHA1, + .name = "PKCS12-ARCFOUR-SHA1", + .flag = GNUTLS_PKCS_PKCS12_ARCFOUR, + .cipher = GNUTLS_CIPHER_ARCFOUR, + .pbes2 = 0, + .cipher_oid = PKCS12_PBE_ARCFOUR_SHA1_OID, + .write_oid = PKCS12_PBE_ARCFOUR_SHA1_OID, + .desc = NULL, + .iv_name = NULL, + .decrypt_only = 0}, + { + .schema = PKCS12_RC2_40_SHA1, + .name = "PKCS12-RC2-40-SHA1", + .flag = GNUTLS_PKCS_PKCS12_RC2_40, + .cipher = GNUTLS_CIPHER_RC2_40_CBC, + .pbes2 = 0, + .cipher_oid = PKCS12_PBE_RC2_40_SHA1_OID, + .write_oid = PKCS12_PBE_RC2_40_SHA1_OID, + .desc = NULL, + .iv_name = NULL, + .decrypt_only = 0}, + { + .schema = PKCS12_3DES_SHA1, + .name = "PKCS12-3DES-SHA1", + .flag = GNUTLS_PKCS_PKCS12_3DES, + .cipher = GNUTLS_CIPHER_3DES_CBC, + .pbes2 = 0, + .cipher_oid = PKCS12_PBE_3DES_SHA1_OID, + .write_oid = PKCS12_PBE_3DES_SHA1_OID, + .desc = NULL, + .iv_name = NULL, + .decrypt_only = 0}, + {0, 0, 0, 0, 0} +}; + +#define PBES2_SCHEMA_LOOP(b) { \ + const struct pkcs_cipher_schema_st * _p; \ + for (_p=avail_pkcs_cipher_schemas;_p->schema != 0;_p++) { b; } \ + } + +#define PBES2_SCHEMA_FIND_FROM_FLAGS(fl, what) \ + PBES2_SCHEMA_LOOP( if (_p->flag == GNUTLS_PKCS_CIPHER_MASK(fl)) { what; } ) + +int _gnutls_pkcs_flags_to_schema(unsigned int flags) +{ + PBES2_SCHEMA_FIND_FROM_FLAGS(flags, return _p->schema; + ); + + gnutls_assert(); + _gnutls_debug_log + ("Selecting default encryption PBES2_AES_256 (flags: %u).\n", + flags); + return PBES2_AES_256; +} + +/** + * gnutls_pkcs_schema_get_name: + * @schema: Holds the PKCS #12 or PBES2 schema (%gnutls_pkcs_encrypt_flags_t) + * + * This function will return a human readable description of the + * PKCS12 or PBES2 schema. + * + * Returns: a constraint string or %NULL on error. + * + * Since: 3.4.0 + */ +const char *gnutls_pkcs_schema_get_name(unsigned int schema) +{ + PBES2_SCHEMA_FIND_FROM_FLAGS(schema, return _p->name; + ); + return NULL; +} + +/** + * gnutls_pkcs_schema_get_oid: + * @schema: Holds the PKCS #12 or PBES2 schema (%gnutls_pkcs_encrypt_flags_t) + * + * This function will return the object identifier of the + * PKCS12 or PBES2 schema. + * + * Returns: a constraint string or %NULL on error. + * + * Since: 3.4.0 + */ +const char *gnutls_pkcs_schema_get_oid(unsigned int schema) +{ + PBES2_SCHEMA_FIND_FROM_FLAGS(schema, return _p->cipher_oid; + ); + return NULL; +} + +static const struct pkcs_cipher_schema_st *algo_to_pbes2_cipher_schema(unsigned + cipher) +{ + PBES2_SCHEMA_LOOP(if (_p->cipher == cipher && _p->pbes2 != 0) { + return _p;} + ) ; + + gnutls_assert(); + return NULL; +} + +/* Converts a PKCS#7 encryption schema OID to an internal + * schema_id or returns a negative value */ +int _gnutls_check_pkcs_cipher_schema(const char *oid) +{ + if (strcmp(oid, PBES2_OID) == 0) + return PBES2_GENERIC; /* PBES2 ciphers are under an umbrella OID */ + + PBES2_SCHEMA_LOOP(if (_p->pbes2 == 0 && strcmp(oid, _p->write_oid) == 0) { + return _p->schema;} + ) ; + _gnutls_debug_log + ("PKCS #12 encryption schema OID '%s' is unsupported.\n", oid); + + return GNUTLS_E_UNKNOWN_CIPHER_TYPE; +} + +const struct pkcs_cipher_schema_st *_gnutls_pkcs_schema_get(schema_id schema) +{ + PBES2_SCHEMA_LOOP(if (schema == _p->schema) return _p;) ; + + gnutls_assert(); + return NULL; +} + +/* Converts an OID to a gnutls cipher type. + */ +static int +pbes2_cipher_oid_to_algo(const char *oid, gnutls_cipher_algorithm_t * algo) +{ + + *algo = 0; + PBES2_SCHEMA_LOOP(if + (_p->pbes2 != 0 && strcmp(_p->cipher_oid, oid) == 0) { + *algo = _p->cipher; return 0;} + ) ; + + _gnutls_debug_log("PKCS #8 encryption OID '%s' is unsupported.\n", oid); + return GNUTLS_E_UNKNOWN_CIPHER_TYPE; +} + +/* Decrypts a PKCS #7 encryptedData. The output is allocated + * and stored in dec. + */ +int +_gnutls_pkcs7_decrypt_data(const gnutls_datum_t * data, + const char *password, gnutls_datum_t * dec) +{ + int result, len; + char enc_oid[MAX_OID_SIZE]; + gnutls_datum_t tmp; + asn1_node pasn = NULL, pkcs7_asn = NULL; + int params_start, params_end, params_len; + struct pbkdf2_params kdf_params; + struct pbe_enc_params enc_params; + schema_id schema; + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-7-EncryptedData", + &pkcs7_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = asn1_der_decoding(&pkcs7_asn, data->data, data->size, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Check the encryption schema OID + */ + len = sizeof(enc_oid); + result = + asn1_read_value(pkcs7_asn, + "encryptedContentInfo.contentEncryptionAlgorithm.algorithm", + enc_oid, &len); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + if ((result = _gnutls_check_pkcs_cipher_schema(enc_oid)) < 0) { + gnutls_assert(); + goto error; + } + schema = result; + + /* Get the DER encoding of the parameters. + */ + result = + asn1_der_decoding_startEnd(pkcs7_asn, data->data, data->size, + "encryptedContentInfo.contentEncryptionAlgorithm.parameters", + ¶ms_start, ¶ms_end); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + params_len = params_end - params_start + 1; + + result = + _gnutls_read_pkcs_schema_params(&schema, password, + &data->data[params_start], + params_len, &kdf_params, + &enc_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + /* Parameters have been decoded. Now + * decrypt the EncryptedData. + */ + + result = + _gnutls_pkcs_raw_decrypt_data(schema, pkcs7_asn, + "encryptedContentInfo.encryptedContent", + password, &kdf_params, &enc_params, + &tmp); + if (result < 0) { + gnutls_assert(); + goto error; + } + + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + + *dec = tmp; + + return 0; + + error: + asn1_delete_structure(&pasn); + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + return result; +} + +int +_gnutls_pkcs7_data_enc_info(const gnutls_datum_t * data, + const struct pkcs_cipher_schema_st **p, + struct pbkdf2_params *kdf_params, char **oid) +{ + int result, len; + char enc_oid[MAX_OID_SIZE]; + asn1_node pasn = NULL, pkcs7_asn = NULL; + int params_start, params_end, params_len; + struct pbe_enc_params enc_params; + schema_id schema; + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-7-EncryptedData", + &pkcs7_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = asn1_der_decoding(&pkcs7_asn, data->data, data->size, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Check the encryption schema OID + */ + len = sizeof(enc_oid); + result = + asn1_read_value(pkcs7_asn, + "encryptedContentInfo.contentEncryptionAlgorithm.algorithm", + enc_oid, &len); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + if (oid) { + *oid = gnutls_strdup(enc_oid); + } + + if ((result = _gnutls_check_pkcs_cipher_schema(enc_oid)) < 0) { + gnutls_assert(); + goto error; + } + schema = result; + + /* Get the DER encoding of the parameters. + */ + result = + asn1_der_decoding_startEnd(pkcs7_asn, data->data, data->size, + "encryptedContentInfo.contentEncryptionAlgorithm.parameters", + ¶ms_start, ¶ms_end); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + params_len = params_end - params_start + 1; + + result = + _gnutls_read_pkcs_schema_params(&schema, NULL, + &data->data[params_start], + params_len, kdf_params, + &enc_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + *p = _gnutls_pkcs_schema_get(schema); + if (*p == NULL) { + gnutls_assert(); + result = GNUTLS_E_UNKNOWN_CIPHER_TYPE; + goto error; + } + + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + + return 0; + + error: + asn1_delete_structure(&pasn); + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + return result; +} + +/* Encrypts to a PKCS #7 encryptedData. The output is allocated + * and stored in enc. + */ +int +_gnutls_pkcs7_encrypt_data(schema_id schema, + const gnutls_datum_t * data, + const char *password, gnutls_datum_t * enc) +{ + int result; + gnutls_datum_t key = { NULL, 0 }; + gnutls_datum_t tmp = { NULL, 0 }; + asn1_node pkcs7_asn = NULL; + struct pbkdf2_params kdf_params; + struct pbe_enc_params enc_params; + const struct pkcs_cipher_schema_st *s; + + s = _gnutls_pkcs_schema_get(schema); + if (s == NULL || s->decrypt_only) { + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + } + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-7-EncryptedData", + &pkcs7_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = + asn1_write_value(pkcs7_asn, + "encryptedContentInfo.contentEncryptionAlgorithm.algorithm", + s->write_oid, 1); + + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Generate a symmetric key. + */ + + result = + _gnutls_pkcs_generate_key(schema, password, &kdf_params, + &enc_params, &key); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = _gnutls_pkcs_write_schema_params(schema, pkcs7_asn, + "encryptedContentInfo.contentEncryptionAlgorithm.parameters", + &kdf_params, &enc_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + /* Parameters have been encoded. Now + * encrypt the Data. + */ + result = _gnutls_pkcs_raw_encrypt_data(data, &enc_params, &key, &tmp); + if (result < 0) { + gnutls_assert(); + goto error; + } + + /* write the encrypted data. + */ + result = + asn1_write_value(pkcs7_asn, + "encryptedContentInfo.encryptedContent", + tmp.data, tmp.size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + _gnutls_free_datum(&tmp); + _gnutls_free_key_datum(&key); + + /* Now write the rest of the pkcs-7 stuff. + */ + + result = _gnutls_x509_write_uint32(pkcs7_asn, "version", 0); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = + asn1_write_value(pkcs7_asn, "encryptedContentInfo.contentType", + DATA_OID, 1); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = asn1_write_value(pkcs7_asn, "unprotectedAttrs", NULL, 0); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Now encode and copy the DER stuff. + */ + result = _gnutls_x509_der_encode(pkcs7_asn, "", enc, 0); + + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + + if (result < 0) { + gnutls_assert(); + goto error; + } + + error: + _gnutls_free_key_datum(&key); + _gnutls_free_datum(&tmp); + asn1_delete_structure2(&pkcs7_asn, ASN1_DELETE_FLAG_ZEROIZE); + return result; +} + +/* Reads the PBKDF2 parameters. + */ +static int +read_pbkdf2_params(asn1_node pasn, + const gnutls_datum_t * der, struct pbkdf2_params *params) +{ + int params_start, params_end; + int params_len, len, result; + asn1_node pbkdf2_asn = NULL; + char oid[MAX_OID_SIZE]; + + memset(params, 0, sizeof(*params)); + + params->mac = GNUTLS_MAC_SHA1; + + /* Check the key derivation algorithm + */ + len = sizeof(oid); + result = + asn1_read_value(pasn, "keyDerivationFunc.algorithm", oid, &len); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + _gnutls_hard_log("keyDerivationFunc.algorithm: %s\n", oid); + + if (strcmp(oid, PBKDF2_OID) != 0) { + gnutls_assert(); + _gnutls_debug_log + ("PKCS #8 key derivation OID '%s' is unsupported.\n", oid); + return _gnutls_asn2err(result); + } + + result = + asn1_der_decoding_startEnd(pasn, der->data, der->size, + "keyDerivationFunc.parameters", + ¶ms_start, ¶ms_end); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + params_len = params_end - params_start + 1; + + /* Now check the key derivation and the encryption + * functions. + */ + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-5-PBKDF2-params", + &pbkdf2_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + result = + _asn1_strict_der_decode(&pbkdf2_asn, &der->data[params_start], + params_len, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* read the salt */ + params->salt_size = sizeof(params->salt); + result = + asn1_read_value(pbkdf2_asn, "salt.specified", params->salt, + ¶ms->salt_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("salt.specified.size: %d\n", params->salt_size); + + if (params->salt_size < 0) { + result = gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER); + goto error; + } + + /* read the iteration count + */ + result = + _gnutls_x509_read_uint(pbkdf2_asn, "iterationCount", + ¶ms->iter_count); + if (result < 0) { + gnutls_assert(); + goto error; + } + + if (params->iter_count >= MAX_ITER_COUNT || params->iter_count == 0) { + result = gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER); + goto error; + } + + _gnutls_hard_log("iterationCount: %d\n", params->iter_count); + + /* read the keylength, if it is set. + */ + result = + _gnutls_x509_read_uint(pbkdf2_asn, "keyLength", ¶ms->key_size); + if (result < 0) { + params->key_size = 0; + } + + if (params->key_size > MAX_CIPHER_KEY_SIZE) { + result = gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER); + goto error; + } + + _gnutls_hard_log("keyLength: %d\n", params->key_size); + + len = sizeof(oid); + result = asn1_read_value(pbkdf2_asn, "prf.algorithm", oid, &len); + if (result != ASN1_SUCCESS) { + /* use the default MAC */ + result = 0; + goto error; + } + + params->mac = gnutls_oid_to_mac(oid); + if (params->mac == GNUTLS_MAC_UNKNOWN) { + gnutls_assert(); + _gnutls_debug_log("Unsupported hash algorithm: %s\n", oid); + result = GNUTLS_E_UNKNOWN_HASH_ALGORITHM; + goto error; + } + + result = 0; + + error: + asn1_delete_structure(&pbkdf2_asn); + return result; + +} + +/* Reads the PBE parameters from PKCS-12 schemas (*&#%*&#% RSA). + */ +static int read_pkcs12_kdf_params(asn1_node pasn, struct pbkdf2_params *params) +{ + int result; + + memset(params, 0, sizeof(*params)); + + /* read the salt */ + params->salt_size = sizeof(params->salt); + result = + asn1_read_value(pasn, "salt", params->salt, ¶ms->salt_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + if (params->salt_size < 0) + return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER); + + _gnutls_hard_log("salt.size: %d\n", params->salt_size); + + /* read the iteration count + */ + result = + _gnutls_x509_read_uint(pasn, "iterations", ¶ms->iter_count); + if (result < 0) + return gnutls_assert_val(result); + + if (params->iter_count >= MAX_ITER_COUNT || params->iter_count == 0) + return gnutls_assert_val(GNUTLS_E_ILLEGAL_PARAMETER); + + _gnutls_hard_log("iterationCount: %d\n", params->iter_count); + + params->key_size = 0; + + return 0; +} + +/* Writes the PBE parameters for PKCS-12 schemas. + */ +static int +write_pkcs12_kdf_params(asn1_node pasn, const struct pbkdf2_params *kdf_params) +{ + int result; + + /* write the salt + */ + result = + asn1_write_value(pasn, "salt", + kdf_params->salt, kdf_params->salt_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("salt.size: %d\n", kdf_params->salt_size); + + /* write the iteration count + */ + result = + _gnutls_x509_write_uint32(pasn, "iterations", + kdf_params->iter_count); + if (result < 0) { + gnutls_assert(); + goto error; + } + _gnutls_hard_log("iterationCount: %d\n", kdf_params->iter_count); + + return 0; + + error: + return result; + +} + +static int +read_pbes2_gost_oid(uint8_t *der, size_t len, char *oid, int oid_size) +{ + int result; + asn1_node pbe_asn = NULL; + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.Gost28147-89-Parameters", &pbe_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + result = + _asn1_strict_der_decode(&pbe_asn, der, len, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = asn1_read_value(pbe_asn, "encryptionParamSet", + oid, &oid_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = 0; + + error: + asn1_delete_structure(&pbe_asn); + return result; +} + +static int +read_pbes2_enc_params(asn1_node pasn, + const gnutls_datum_t * der, struct pbe_enc_params *params) +{ + int params_start, params_end; + int params_len, len, result; + asn1_node pbe_asn = NULL; + const struct pkcs_cipher_schema_st *p; + + memset(params, 0, sizeof(*params)); + + /* Check the encryption algorithm + */ + len = sizeof(params->pbes2_oid); + result = asn1_read_value(pasn, "encryptionScheme.algorithm", params->pbes2_oid, &len); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + _gnutls_hard_log("encryptionScheme.algorithm: %s\n", params->pbes2_oid); + + result = + asn1_der_decoding_startEnd(pasn, der->data, der->size, + "encryptionScheme.parameters", + ¶ms_start, ¶ms_end); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + params_len = params_end - params_start + 1; + + /* For GOST we have to read params to determine actual cipher */ + if (!strcmp(params->pbes2_oid, GOST28147_89_OID)) { + len = sizeof(params->pbes2_oid); + result = read_pbes2_gost_oid(&der->data[params_start], + params_len, params->pbes2_oid, len); + if (result < 0) { + gnutls_assert(); + return result; + } + } + + if ((result = pbes2_cipher_oid_to_algo(params->pbes2_oid, ¶ms->cipher)) < 0) { + gnutls_assert(); + return result; + } + + /* Now check the encryption parameters. + */ + p = algo_to_pbes2_cipher_schema(params->cipher); + if (p == NULL) { + gnutls_assert(); + return GNUTLS_E_INVALID_REQUEST; + } + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + p->desc, &pbe_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + result = + _asn1_strict_der_decode(&pbe_asn, &der->data[params_start], + params_len, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* read the IV */ + params->iv_size = sizeof(params->iv); + result = asn1_read_value(pbe_asn, + p->iv_name, + params->iv, ¶ms->iv_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("IV.size: %d\n", params->iv_size); + + result = 0; + + error: + asn1_delete_structure(&pbe_asn); + return result; +} + +/* Read the parameters cipher, IV, salt etc using the given + * schema ID. Initially the schema ID should have PBES2_GENERIC, for + * PBES2 schemas, and will be updated by this function for details. + */ +int +_gnutls_read_pkcs_schema_params(schema_id * schema, const char *password, + const uint8_t * data, int data_size, + struct pbkdf2_params *kdf_params, + struct pbe_enc_params *enc_params) +{ + asn1_node pasn = NULL; + int result; + gnutls_datum_t tmp; + const struct pkcs_cipher_schema_st *p; + + if (*schema == PBES2_GENERIC) { + /* Now check the key derivation and the encryption + * functions. + */ + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-5-PBES2-params", + &pasn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Decode the parameters. + */ + result = _asn1_strict_der_decode(&pasn, data, data_size, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + tmp.data = (uint8_t *) data; + tmp.size = data_size; + + result = read_pbkdf2_params(pasn, &tmp, kdf_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = read_pbes2_enc_params(pasn, &tmp, enc_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + asn1_delete_structure2(&pasn, ASN1_DELETE_FLAG_ZEROIZE); + + p = algo_to_pbes2_cipher_schema(enc_params->cipher); + if (p == NULL) { + result = GNUTLS_E_INVALID_REQUEST; + gnutls_assert(); + goto error; + } + + *schema = p->schema; + return 0; + } else if (*schema == PBES1_DES_MD5) { + return _gnutls_read_pbkdf1_params(data, data_size, kdf_params, + enc_params); + } else { /* PKCS #12 schema */ + memset(enc_params, 0, sizeof(*enc_params)); + + p = _gnutls_pkcs_schema_get(*schema); + if (p == NULL) { + gnutls_assert(); + result = GNUTLS_E_UNKNOWN_CIPHER_TYPE; + goto error; + } + enc_params->cipher = p->cipher; + enc_params->iv_size = gnutls_cipher_get_iv_size(p->cipher); + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-12-PbeParams", + &pasn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* Decode the parameters. + */ + result = _asn1_strict_der_decode(&pasn, data, data_size, NULL); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = read_pkcs12_kdf_params(pasn, kdf_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + if (enc_params->iv_size) { + result = + _gnutls_pkcs12_string_to_key(mac_to_entry + (GNUTLS_MAC_SHA1), + 2 /*IV*/, + kdf_params->salt, + kdf_params->salt_size, + kdf_params->iter_count, + password, + enc_params->iv_size, + enc_params->iv); + if (result < 0) { + gnutls_assert(); + goto error; + } + + } + + asn1_delete_structure(&pasn); + + return 0; + } /* switch */ + + error: + asn1_delete_structure(&pasn); + return result; +} + +static int +_gnutls_pbes2_string_to_key(unsigned int pass_len, const char *password, + const struct pbkdf2_params *kdf_params, + int key_size, uint8_t *key) +{ + gnutls_datum_t _key; + gnutls_datum_t salt; + + _key.data = (void *)password; + _key.size = pass_len; + salt.data = (void *)kdf_params->salt; + salt.size = kdf_params->salt_size; + + return gnutls_pbkdf2(kdf_params->mac, &_key, &salt, + kdf_params->iter_count, key, key_size); +} + +int +_gnutls_pkcs_raw_decrypt_data(schema_id schema, asn1_node pkcs8_asn, + const char *root, const char *_password, + const struct pbkdf2_params *kdf_params, + const struct pbe_enc_params *enc_params, + gnutls_datum_t * decrypted_data) +{ + gnutls_datum_t enc = { NULL, 0 }; + uint8_t *key = NULL; + gnutls_datum_t dkey, d_iv; + gnutls_cipher_hd_t ch = NULL; + int key_size, ret; + unsigned int pass_len = 0; + const struct pkcs_cipher_schema_st *p; + unsigned block_size; + const cipher_entry_st *ce; + char *password; + + if (_password) { + gnutls_datum_t pout; + ret = _gnutls_utf8_password_normalize(_password, strlen(_password), &pout, 1); + if (ret < 0) + return gnutls_assert_val(ret); + + password = (char*)pout.data; + pass_len = pout.size; + } else { + password = NULL; + pass_len = 0; + } + + ret = _gnutls_x509_read_value(pkcs8_asn, root, &enc); + if (ret < 0) { + gnutls_assert(); + enc.data = NULL; + goto cleanup; + } + + if (schema == PBES1_DES_MD5) { + ret = _gnutls_decrypt_pbes1_des_md5_data(password, pass_len, + kdf_params, + enc_params, &enc, + decrypted_data); + if (ret < 0) + goto error; + goto cleanup; + } + + if (kdf_params->key_size == 0) { + key_size = gnutls_cipher_get_key_size(enc_params->cipher); + } else + key_size = kdf_params->key_size; + + key = gnutls_malloc(key_size); + if (key == NULL) { + gnutls_assert(); + ret = GNUTLS_E_MEMORY_ERROR; + goto error; + } + + /* generate the key + */ + p = _gnutls_pkcs_schema_get(schema); + if (p != NULL && p->pbes2 != 0) { /* PBES2 */ + ret = _gnutls_pbes2_string_to_key(pass_len, password, + kdf_params, + key_size, key); + if (ret < 0) { + gnutls_assert(); + goto error; + } + } else if (p != NULL) { /* PKCS 12 schema */ + ret = + _gnutls_pkcs12_string_to_key(mac_to_entry(GNUTLS_MAC_SHA1), + 1 /*KEY*/, + kdf_params->salt, + kdf_params->salt_size, + kdf_params->iter_count, + password, key_size, key); + + if (ret < 0) { + gnutls_assert(); + goto error; + } + } else { + gnutls_assert(); + ret = GNUTLS_E_UNKNOWN_CIPHER_TYPE; + goto error; + } + + ce = cipher_to_entry(enc_params->cipher); + block_size = _gnutls_cipher_get_block_size(ce); + + if (ce->type == CIPHER_BLOCK) { + if (enc.size % block_size != 0 || (unsigned)enc_params->iv_size != block_size) { + gnutls_assert(); + ret = GNUTLS_E_DECRYPTION_FAILED; + goto error; + } + } else { + unsigned iv_size = _gnutls_cipher_get_iv_size(ce); + if (iv_size > (unsigned)enc_params->iv_size) { + gnutls_assert(); + ret = GNUTLS_E_DECRYPTION_FAILED; + goto error; + } + } + + /* do the decryption. + */ + dkey.data = key; + dkey.size = key_size; + + d_iv.data = (uint8_t *) enc_params->iv; + d_iv.size = enc_params->iv_size; + + ret = gnutls_cipher_init(&ch, ce->id, &dkey, &d_iv); + + zeroize_temp_key(key, key_size); + gnutls_free(key); + + if (ret < 0) { + gnutls_assert(); + goto error; + } + + ret = gnutls_cipher_decrypt(ch, enc.data, enc.size); + if (ret < 0) { + gnutls_assert(); + ret = GNUTLS_E_DECRYPTION_FAILED; + goto error; + } + + decrypted_data->data = enc.data; + + if (ce->type == CIPHER_BLOCK && block_size != 1) { + unsigned pslen = (uint8_t)enc.data[enc.size - 1]; + unsigned i; + + if (pslen > block_size || pslen >= enc.size || pslen == 0) { + gnutls_assert(); + ret = GNUTLS_E_DECRYPTION_FAILED; + goto error; + } + + /* verify padding according to rfc2898 */ + decrypted_data->size = enc.size - pslen; + for (i=0;i<pslen;i++) { + if (enc.data[enc.size-1-i] != pslen) { + gnutls_assert(); + ret = GNUTLS_E_DECRYPTION_FAILED; + goto error; + } + } + } else { + decrypted_data->size = enc.size; + } + + gnutls_cipher_deinit(ch); + + ret = 0; + + cleanup: + if (password) { + zeroize_temp_key(password, pass_len); + gnutls_free(password); + } + + return ret; + + error: + if (password) { + zeroize_temp_key(password, pass_len); + gnutls_free(password); + } + if (enc.data) { + zeroize_temp_key(enc.data, enc.size); + gnutls_free(enc.data); + } + if (key) { + zeroize_temp_key(key, key_size); + gnutls_free(key); + } + if (ch) { + gnutls_cipher_deinit(ch); + } + return ret; +} + +/* Writes the PBKDF2 parameters. + */ +static int +write_pbkdf2_params(asn1_node pasn, const struct pbkdf2_params *kdf_params) +{ + int result; + asn1_node pbkdf2_asn = NULL; + uint8_t tmp[MAX_OID_SIZE]; + const mac_entry_st *me; + + /* Write the key derivation algorithm + */ + result = + asn1_write_value(pasn, "keyDerivationFunc.algorithm", + PBKDF2_OID, 1); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + /* Now write the key derivation and the encryption + * functions. + */ + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-5-PBKDF2-params", + &pbkdf2_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + result = asn1_write_value(pbkdf2_asn, "salt", "specified", 1); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* write the salt + */ + result = + asn1_write_value(pbkdf2_asn, "salt.specified", + kdf_params->salt, kdf_params->salt_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("salt.specified.size: %d\n", kdf_params->salt_size); + + /* write the iteration count + */ + _gnutls_write_uint32(kdf_params->iter_count, tmp); + + result = asn1_write_value(pbkdf2_asn, "iterationCount", tmp, 4); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("iterationCount: %d\n", kdf_params->iter_count); + + /* write the keylength, if it is set. + */ + result = asn1_write_value(pbkdf2_asn, "keyLength", NULL, 0); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + me = _gnutls_mac_to_entry(kdf_params->mac); + if (!me || !me->mac_oid) { + gnutls_assert(); + result = GNUTLS_E_INTERNAL_ERROR; + goto error; + } + + result = asn1_write_value(pbkdf2_asn, "prf.algorithm", + me->mac_oid, strlen(me->mac_oid)); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = asn1_write_value(pbkdf2_asn, "prf.parameters", NULL, 0); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + /* now encode them an put the DER output + * in the keyDerivationFunc.parameters + */ + result = _gnutls_x509_der_encode_and_copy(pbkdf2_asn, "", + pasn, + "keyDerivationFunc.parameters", + 0); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = 0; + + error: + asn1_delete_structure(&pbkdf2_asn); + return result; + +} + +static int +write_pbes2_enc_params(asn1_node pasn, const struct pbe_enc_params *params) +{ + int result; + asn1_node pbe_asn = NULL; + const struct pkcs_cipher_schema_st *p; + const char *cipher_oid; + + /* Write the encryption algorithm + */ + p = algo_to_pbes2_cipher_schema(params->cipher); + if (p == NULL || p->pbes2 == 0) { + gnutls_assert(); + return GNUTLS_E_INVALID_REQUEST; + } + + /* Now check the encryption parameters. + */ + if ((result = + asn1_create_element(_gnutls_get_pkix(), + p->desc, &pbe_asn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + if (p->schema == PBES2_GOST28147_89_TC26Z || + p->schema == PBES2_GOST28147_89_CPA || + p->schema == PBES2_GOST28147_89_CPB || + p->schema == PBES2_GOST28147_89_CPC || + p->schema == PBES2_GOST28147_89_CPD) { + cipher_oid = GOST28147_89_OID; + result = asn1_write_value(pbe_asn, "encryptionParamSet", + p->cipher_oid, 1); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + } else { + cipher_oid = p->cipher_oid; + } + + result = + asn1_write_value(pasn, "encryptionScheme.algorithm", + cipher_oid, + 1); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + goto error; + } + _gnutls_hard_log("encryptionScheme.algorithm: %s\n", cipher_oid); + + /* read the salt */ + result = asn1_write_value(pbe_asn, p->iv_name, + params->iv, params->iv_size); + if (result != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + _gnutls_hard_log("IV.size: %d\n", params->iv_size); + + /* now encode them an put the DER output + * in the encryptionScheme.parameters + */ + result = _gnutls_x509_der_encode_and_copy(pbe_asn, "", + pasn, + "encryptionScheme.parameters", + 0); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = 0; + + error: + asn1_delete_structure(&pbe_asn); + return result; + +} + +/* Generates a key and also stores the key parameters. + */ +int +_gnutls_pkcs_generate_key(schema_id schema, + const char *_password, + struct pbkdf2_params *kdf_params, + struct pbe_enc_params *enc_params, + gnutls_datum_t * key) +{ + unsigned char rnd[2]; + unsigned int pass_len = 0; + int ret; + const struct pkcs_cipher_schema_st *p; + char *password = NULL; + + if (_password) { + gnutls_datum_t pout; + ret = _gnutls_utf8_password_normalize(_password, strlen(_password), &pout, 0); + if (ret < 0) + return gnutls_assert_val(ret); + + password = (char*)pout.data; + pass_len = pout.size; + } else { + password = NULL; + pass_len = 0; + } + + ret = gnutls_rnd(GNUTLS_RND_RANDOM, rnd, 2); + if (ret < 0) { + gnutls_assert(); + goto cleanup; + } + + /* generate salt */ + kdf_params->salt_size = + MIN(sizeof(kdf_params->salt), (unsigned)(12 + (rnd[1] % 10))); + + p = _gnutls_pkcs_schema_get(schema); + if (p != NULL && p->pbes2 != 0) { /* PBES2 */ + enc_params->cipher = p->cipher; + } else if (p != NULL) { + /* non PBES2 algorithms */ + enc_params->cipher = p->cipher; + kdf_params->salt_size = 8; + } else { + gnutls_assert(); + ret = GNUTLS_E_INVALID_REQUEST; + goto cleanup; + } + + ret = gnutls_rnd(GNUTLS_RND_RANDOM, kdf_params->salt, + kdf_params->salt_size); + if (ret < 0) { + gnutls_assert(); + goto cleanup; + } + + kdf_params->iter_count = PKCS12_ITER_COUNT; + key->size = kdf_params->key_size = + gnutls_cipher_get_key_size(enc_params->cipher); + + enc_params->iv_size = gnutls_cipher_get_iv_size(enc_params->cipher); + key->data = gnutls_malloc(key->size); + if (key->data == NULL) { + gnutls_assert(); + ret = GNUTLS_E_MEMORY_ERROR; + goto cleanup; + } + + /* now generate the key. + */ + + if (p->pbes2 != 0) { + if (p->schema == PBES2_GOST28147_89_TC26Z) + kdf_params->mac = GNUTLS_MAC_STREEBOG_512; + else if (p->schema == PBES2_GOST28147_89_CPA || + p->schema == PBES2_GOST28147_89_CPB || + p->schema == PBES2_GOST28147_89_CPC || + p->schema == PBES2_GOST28147_89_CPD) + kdf_params->mac = GNUTLS_MAC_GOSTR_94; + else + kdf_params->mac = GNUTLS_MAC_SHA256; + ret = _gnutls_pbes2_string_to_key(pass_len, password, + kdf_params, + kdf_params->key_size, + key->data); + if (ret < 0) { + gnutls_assert(); + return ret; + } + + if (enc_params->iv_size) { + ret = gnutls_rnd(GNUTLS_RND_NONCE, + enc_params->iv, enc_params->iv_size); + if (ret < 0) { + gnutls_assert(); + goto cleanup; + } + } + } else { /* PKCS 12 schema */ + ret = + _gnutls_pkcs12_string_to_key(mac_to_entry(GNUTLS_MAC_SHA1), + 1 /*KEY*/, + kdf_params->salt, + kdf_params->salt_size, + kdf_params->iter_count, + password, + kdf_params->key_size, + key->data); + if (ret < 0) { + gnutls_assert(); + goto cleanup; + } + + /* Now generate the IV + */ + if (enc_params->iv_size) { + ret = + _gnutls_pkcs12_string_to_key(mac_to_entry + (GNUTLS_MAC_SHA1), + 2 /*IV*/, + kdf_params->salt, + kdf_params->salt_size, + kdf_params->iter_count, + password, + enc_params->iv_size, + enc_params->iv); + if (ret < 0) { + gnutls_assert(); + goto cleanup; + } + } + } + + ret = 0; + + cleanup: + gnutls_free(password); + return ret; +} + +/* Encodes the parameters to be written in the encryptionAlgorithm.parameters + * part. + */ +int +_gnutls_pkcs_write_schema_params(schema_id schema, asn1_node pkcs8_asn, + const char *where, + const struct pbkdf2_params *kdf_params, + const struct pbe_enc_params *enc_params) +{ + int result; + asn1_node pasn = NULL; + const struct pkcs_cipher_schema_st *p; + + p = _gnutls_pkcs_schema_get(schema); + + if (p != NULL && p->pbes2 != 0) { /* PBES2 */ + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-5-PBES2-params", + &pasn)) != ASN1_SUCCESS) { + gnutls_assert(); + return _gnutls_asn2err(result); + } + + result = write_pbkdf2_params(pasn, kdf_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = write_pbes2_enc_params(pasn, enc_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = _gnutls_x509_der_encode_and_copy(pasn, "", + pkcs8_asn, where, 0); + if (result < 0) { + gnutls_assert(); + goto error; + } + + asn1_delete_structure(&pasn); + + } else if (p != NULL) { /* PKCS #12 */ + + if ((result = + asn1_create_element(_gnutls_get_pkix(), + "PKIX1.pkcs-12-PbeParams", + &pasn)) != ASN1_SUCCESS) { + gnutls_assert(); + result = _gnutls_asn2err(result); + goto error; + } + + result = write_pkcs12_kdf_params(pasn, kdf_params); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = _gnutls_x509_der_encode_and_copy(pasn, "", + pkcs8_asn, where, 0); + if (result < 0) { + gnutls_assert(); + goto error; + } + + asn1_delete_structure(&pasn); + } + + return 0; + + error: + asn1_delete_structure(&pasn); + return result; + +} + +int +_gnutls_pkcs_raw_encrypt_data(const gnutls_datum_t * plain, + const struct pbe_enc_params *enc_params, + const gnutls_datum_t * key, gnutls_datum_t * encrypted) +{ + int result; + int data_size; + uint8_t *data = NULL; + gnutls_datum_t d_iv; + gnutls_cipher_hd_t ch = NULL; + uint8_t pad, pad_size; + const cipher_entry_st *ce; + + ce = cipher_to_entry(enc_params->cipher); + pad_size = _gnutls_cipher_get_block_size(ce); + + if (pad_size == 1 || ce->type == CIPHER_STREAM) /* stream */ + pad_size = 0; + + data = gnutls_malloc(plain->size + pad_size); + if (data == NULL) { + gnutls_assert(); + return GNUTLS_E_MEMORY_ERROR; + } + + memcpy(data, plain->data, plain->size); + + if (pad_size > 0) { + pad = pad_size - (plain->size % pad_size); + if (pad == 0) + pad = pad_size; + memset(&data[plain->size], pad, pad); + } else + pad = 0; + + data_size = plain->size + pad; + + d_iv.data = (uint8_t *) enc_params->iv; + d_iv.size = enc_params->iv_size; + result = gnutls_cipher_init(&ch, enc_params->cipher, key, &d_iv); + if (result < 0) { + gnutls_assert(); + goto error; + } + + result = gnutls_cipher_encrypt(ch, data, data_size); + if (result < 0) { + gnutls_assert(); + goto error; + } + + encrypted->data = data; + encrypted->size = data_size; + + gnutls_cipher_deinit(ch); + + return 0; + + error: + gnutls_free(data); + if (ch) { + gnutls_cipher_deinit(ch); + } + return result; +} |