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|
/*
* ngtcp2
*
* Copyright (c) 2020 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <assert.h>
#include <ngtcp2/ngtcp2_crypto.h>
#include <ngtcp2/ngtcp2_crypto_gnutls.h>
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <string.h>
#include "shared.h"
ngtcp2_crypto_aead *ngtcp2_crypto_aead_aes_128_gcm(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)GNUTLS_CIPHER_AES_128_GCM);
}
ngtcp2_crypto_md *ngtcp2_crypto_md_sha256(ngtcp2_crypto_md *md) {
md->native_handle = (void *)GNUTLS_DIG_SHA256;
return md;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_initial(ngtcp2_crypto_ctx *ctx) {
ngtcp2_crypto_aead_init(&ctx->aead, (void *)GNUTLS_CIPHER_AES_128_GCM);
ctx->md.native_handle = (void *)GNUTLS_DIG_SHA256;
ctx->hp.native_handle = (void *)GNUTLS_CIPHER_AES_128_CBC;
ctx->max_encryption = 0;
ctx->max_decryption_failure = 0;
return ctx;
}
ngtcp2_crypto_aead *ngtcp2_crypto_aead_init(ngtcp2_crypto_aead *aead,
void *aead_native_handle) {
aead->native_handle = aead_native_handle;
aead->max_overhead = gnutls_cipher_get_tag_size(
(gnutls_cipher_algorithm_t)(intptr_t)aead_native_handle);
return aead;
}
ngtcp2_crypto_aead *ngtcp2_crypto_aead_retry(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)GNUTLS_CIPHER_AES_128_GCM);
}
static gnutls_cipher_algorithm_t
crypto_get_hp(gnutls_cipher_algorithm_t cipher) {
switch (cipher) {
case GNUTLS_CIPHER_AES_128_GCM:
case GNUTLS_CIPHER_AES_128_CCM:
return GNUTLS_CIPHER_AES_128_CBC;
case GNUTLS_CIPHER_AES_256_GCM:
case GNUTLS_CIPHER_AES_256_CCM:
return GNUTLS_CIPHER_AES_256_CBC;
case GNUTLS_CIPHER_CHACHA20_POLY1305:
return GNUTLS_CIPHER_CHACHA20_32;
default:
return GNUTLS_CIPHER_UNKNOWN;
}
}
static uint64_t
crypto_get_aead_max_encryption(gnutls_cipher_algorithm_t cipher) {
switch (cipher) {
case GNUTLS_CIPHER_AES_128_GCM:
case GNUTLS_CIPHER_AES_256_GCM:
return NGTCP2_CRYPTO_MAX_ENCRYPTION_AES_GCM;
case GNUTLS_CIPHER_CHACHA20_POLY1305:
return NGTCP2_CRYPTO_MAX_ENCRYPTION_CHACHA20_POLY1305;
case GNUTLS_CIPHER_AES_128_CCM:
case GNUTLS_CIPHER_AES_256_CCM:
return NGTCP2_CRYPTO_MAX_ENCRYPTION_AES_CCM;
default:
return 0;
}
}
static uint64_t
crypto_get_aead_max_decryption_failure(gnutls_cipher_algorithm_t cipher) {
switch (cipher) {
case GNUTLS_CIPHER_AES_128_GCM:
case GNUTLS_CIPHER_AES_256_GCM:
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_AES_GCM;
case GNUTLS_CIPHER_CHACHA20_POLY1305:
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_CHACHA20_POLY1305;
case GNUTLS_CIPHER_AES_128_CCM:
case GNUTLS_CIPHER_AES_256_CCM:
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_AES_CCM;
default:
return 0;
}
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle) {
gnutls_session_t session = tls_native_handle;
gnutls_cipher_algorithm_t cipher;
gnutls_digest_algorithm_t hash;
gnutls_cipher_algorithm_t hp_cipher;
cipher = gnutls_cipher_get(session);
if (cipher != GNUTLS_CIPHER_UNKNOWN && cipher != GNUTLS_CIPHER_NULL) {
ngtcp2_crypto_aead_init(&ctx->aead, (void *)cipher);
}
hash = gnutls_prf_hash_get(session);
if (hash != GNUTLS_DIG_UNKNOWN && hash != GNUTLS_DIG_NULL) {
ctx->md.native_handle = (void *)hash;
}
hp_cipher = crypto_get_hp(cipher);
if (hp_cipher != GNUTLS_CIPHER_UNKNOWN) {
ctx->hp.native_handle = (void *)hp_cipher;
}
ctx->max_encryption = crypto_get_aead_max_encryption(cipher);
ctx->max_decryption_failure = crypto_get_aead_max_decryption_failure(cipher);
return ctx;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls_early(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle) {
gnutls_session_t session = tls_native_handle;
gnutls_cipher_algorithm_t cipher;
gnutls_digest_algorithm_t hash;
gnutls_cipher_algorithm_t hp_cipher;
cipher = gnutls_early_cipher_get(session);
if (cipher != GNUTLS_CIPHER_UNKNOWN && cipher != GNUTLS_CIPHER_NULL) {
ngtcp2_crypto_aead_init(&ctx->aead, (void *)cipher);
}
hash = gnutls_early_prf_hash_get(session);
if (hash != GNUTLS_DIG_UNKNOWN && hash != GNUTLS_DIG_NULL) {
ctx->md.native_handle = (void *)hash;
}
hp_cipher = crypto_get_hp(cipher);
if (hp_cipher != GNUTLS_CIPHER_UNKNOWN) {
ctx->hp.native_handle = (void *)hp_cipher;
}
ctx->max_encryption = crypto_get_aead_max_encryption(cipher);
ctx->max_decryption_failure = crypto_get_aead_max_decryption_failure(cipher);
return ctx;
}
size_t ngtcp2_crypto_md_hashlen(const ngtcp2_crypto_md *md) {
return gnutls_hash_get_len(
(gnutls_digest_algorithm_t)(intptr_t)md->native_handle);
}
size_t ngtcp2_crypto_aead_keylen(const ngtcp2_crypto_aead *aead) {
return gnutls_cipher_get_key_size(
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle);
}
size_t ngtcp2_crypto_aead_noncelen(const ngtcp2_crypto_aead *aead) {
return gnutls_cipher_get_iv_size(
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle);
}
int ngtcp2_crypto_aead_ctx_encrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen) {
gnutls_cipher_algorithm_t cipher =
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle;
gnutls_aead_cipher_hd_t hd;
gnutls_datum_t _key;
(void)noncelen;
_key.data = (void *)key;
_key.size = (unsigned int)ngtcp2_crypto_aead_keylen(aead);
if (gnutls_aead_cipher_init(&hd, cipher, &_key) != 0) {
return -1;
}
aead_ctx->native_handle = hd;
return 0;
}
int ngtcp2_crypto_aead_ctx_decrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen) {
gnutls_cipher_algorithm_t cipher =
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle;
gnutls_aead_cipher_hd_t hd;
gnutls_datum_t _key;
(void)noncelen;
_key.data = (void *)key;
_key.size = (unsigned int)ngtcp2_crypto_aead_keylen(aead);
if (gnutls_aead_cipher_init(&hd, cipher, &_key) != 0) {
return -1;
}
aead_ctx->native_handle = hd;
return 0;
}
void ngtcp2_crypto_aead_ctx_free(ngtcp2_crypto_aead_ctx *aead_ctx) {
if (aead_ctx->native_handle) {
gnutls_aead_cipher_deinit(aead_ctx->native_handle);
}
}
int ngtcp2_crypto_cipher_ctx_encrypt_init(ngtcp2_crypto_cipher_ctx *cipher_ctx,
const ngtcp2_crypto_cipher *cipher,
const uint8_t *key) {
gnutls_cipher_algorithm_t _cipher =
(gnutls_cipher_algorithm_t)(intptr_t)cipher->native_handle;
gnutls_cipher_hd_t hd;
gnutls_datum_t _key;
_key.data = (void *)key;
_key.size = (unsigned int)gnutls_cipher_get_key_size(_cipher);
if (gnutls_cipher_init(&hd, _cipher, &_key, NULL) != 0) {
return -1;
}
cipher_ctx->native_handle = hd;
return 0;
}
void ngtcp2_crypto_cipher_ctx_free(ngtcp2_crypto_cipher_ctx *cipher_ctx) {
if (cipher_ctx->native_handle) {
gnutls_cipher_deinit(cipher_ctx->native_handle);
}
}
int ngtcp2_crypto_hkdf_extract(uint8_t *dest, const ngtcp2_crypto_md *md,
const uint8_t *secret, size_t secretlen,
const uint8_t *salt, size_t saltlen) {
gnutls_mac_algorithm_t prf =
(gnutls_mac_algorithm_t)(intptr_t)md->native_handle;
gnutls_datum_t _secret = {(void *)secret, (unsigned int)secretlen};
gnutls_datum_t _salt = {(void *)salt, (unsigned int)saltlen};
if (gnutls_hkdf_extract(prf, &_secret, &_salt, dest) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_hkdf_expand(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md, const uint8_t *secret,
size_t secretlen, const uint8_t *info,
size_t infolen) {
gnutls_mac_algorithm_t prf =
(gnutls_mac_algorithm_t)(intptr_t)md->native_handle;
gnutls_datum_t _secret = {(void *)secret, (unsigned int)secretlen};
gnutls_datum_t _info = {(void *)info, (unsigned int)infolen};
if (gnutls_hkdf_expand(prf, &_secret, &_info, dest, destlen) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_hkdf(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md, const uint8_t *secret,
size_t secretlen, const uint8_t *salt, size_t saltlen,
const uint8_t *info, size_t infolen) {
gnutls_mac_algorithm_t prf =
(gnutls_mac_algorithm_t)(intptr_t)md->native_handle;
size_t keylen = ngtcp2_crypto_md_hashlen(md);
uint8_t key[64];
gnutls_datum_t _secret = {(void *)secret, (unsigned int)secretlen};
gnutls_datum_t _key = {(void *)key, (unsigned int)keylen};
gnutls_datum_t _salt = {(void *)salt, (unsigned int)saltlen};
gnutls_datum_t _info = {(void *)info, (unsigned int)infolen};
assert(keylen <= sizeof(key));
if (gnutls_hkdf_extract(prf, &_secret, &_salt, key) != 0) {
return -1;
}
if (gnutls_hkdf_expand(prf, &_key, &_info, dest, destlen) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_encrypt(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *plaintext, size_t plaintextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *aad, size_t aadlen) {
gnutls_cipher_algorithm_t cipher =
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle;
gnutls_aead_cipher_hd_t hd = aead_ctx->native_handle;
size_t taglen = gnutls_cipher_get_tag_size(cipher);
size_t ciphertextlen = plaintextlen + taglen;
if (gnutls_aead_cipher_encrypt(hd, nonce, noncelen, aad, aadlen, taglen,
plaintext, plaintextlen, dest,
&ciphertextlen) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_decrypt(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *ciphertext, size_t ciphertextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *aad, size_t aadlen) {
gnutls_cipher_algorithm_t cipher =
(gnutls_cipher_algorithm_t)(intptr_t)aead->native_handle;
gnutls_aead_cipher_hd_t hd = aead_ctx->native_handle;
size_t taglen = gnutls_cipher_get_tag_size(cipher);
size_t plaintextlen;
if (taglen > ciphertextlen) {
return -1;
}
plaintextlen = ciphertextlen - taglen;
if (gnutls_aead_cipher_decrypt(hd, nonce, noncelen, aad, aadlen, taglen,
ciphertext, ciphertextlen, dest,
&plaintextlen) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_hp_mask(uint8_t *dest, const ngtcp2_crypto_cipher *hp,
const ngtcp2_crypto_cipher_ctx *hp_ctx,
const uint8_t *sample) {
gnutls_cipher_algorithm_t cipher =
(gnutls_cipher_algorithm_t)(intptr_t)hp->native_handle;
gnutls_cipher_hd_t hd = hp_ctx->native_handle;
switch (cipher) {
case GNUTLS_CIPHER_AES_128_CBC:
case GNUTLS_CIPHER_AES_256_CBC: {
uint8_t iv[16];
uint8_t buf[16];
/* Emulate one block AES-ECB by invalidating the effect of IV */
memset(iv, 0, sizeof(iv));
gnutls_cipher_set_iv(hd, iv, sizeof(iv));
if (gnutls_cipher_encrypt2(hd, sample, 16, buf, sizeof(buf)) != 0) {
return -1;
}
memcpy(dest, buf, 5);
} break;
case GNUTLS_CIPHER_CHACHA20_32: {
static const uint8_t PLAINTEXT[] = "\x00\x00\x00\x00\x00";
uint8_t buf[5 + 16];
size_t buflen = sizeof(buf);
gnutls_cipher_set_iv(hd, (void *)sample, 16);
if (gnutls_cipher_encrypt2(hd, PLAINTEXT, sizeof(PLAINTEXT) - 1, buf,
buflen) != 0) {
return -1;
}
memcpy(dest, buf, 5);
} break;
default:
assert(0);
}
return 0;
}
ngtcp2_crypto_level ngtcp2_crypto_gnutls_from_gnutls_record_encryption_level(
gnutls_record_encryption_level_t gtls_level) {
switch (gtls_level) {
case GNUTLS_ENCRYPTION_LEVEL_INITIAL:
return NGTCP2_CRYPTO_LEVEL_INITIAL;
case GNUTLS_ENCRYPTION_LEVEL_HANDSHAKE:
return NGTCP2_CRYPTO_LEVEL_HANDSHAKE;
case GNUTLS_ENCRYPTION_LEVEL_APPLICATION:
return NGTCP2_CRYPTO_LEVEL_APPLICATION;
case GNUTLS_ENCRYPTION_LEVEL_EARLY:
return NGTCP2_CRYPTO_LEVEL_EARLY;
default:
assert(0);
abort();
}
}
gnutls_record_encryption_level_t
ngtcp2_crypto_gnutls_from_ngtcp2_level(ngtcp2_crypto_level crypto_level) {
switch (crypto_level) {
case NGTCP2_CRYPTO_LEVEL_INITIAL:
return GNUTLS_ENCRYPTION_LEVEL_INITIAL;
case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
return GNUTLS_ENCRYPTION_LEVEL_HANDSHAKE;
case NGTCP2_CRYPTO_LEVEL_APPLICATION:
return GNUTLS_ENCRYPTION_LEVEL_APPLICATION;
case NGTCP2_CRYPTO_LEVEL_EARLY:
return GNUTLS_ENCRYPTION_LEVEL_EARLY;
default:
assert(0);
abort();
}
}
int ngtcp2_crypto_read_write_crypto_data(ngtcp2_conn *conn,
ngtcp2_crypto_level crypto_level,
const uint8_t *data, size_t datalen) {
gnutls_session_t session = ngtcp2_conn_get_tls_native_handle(conn);
int rv;
if (datalen > 0) {
rv = gnutls_handshake_write(
session, ngtcp2_crypto_gnutls_from_ngtcp2_level(crypto_level), data,
datalen);
if (rv != 0) {
if (!gnutls_error_is_fatal(rv)) {
return 0;
}
gnutls_alert_send_appropriate(session, rv);
return -1;
}
}
if (!ngtcp2_conn_get_handshake_completed(conn)) {
rv = gnutls_handshake(session);
if (rv < 0) {
if (!gnutls_error_is_fatal(rv)) {
return 0;
}
gnutls_alert_send_appropriate(session, rv);
return -1;
}
ngtcp2_conn_handshake_completed(conn);
}
return 0;
}
int ngtcp2_crypto_set_remote_transport_params(ngtcp2_conn *conn, void *tls) {
(void)conn;
(void)tls;
/* Nothing to do; GnuTLS applications are supposed to register the
quic_transport_parameters extension with
gnutls_session_ext_register. */
return 0;
}
int ngtcp2_crypto_set_local_transport_params(void *tls, const uint8_t *buf,
size_t len) {
(void)tls;
(void)buf;
(void)len;
/* Nothing to do; GnuTLS applications are supposed to register the
quic_transport_parameters extension with
gnutls_session_ext_register. */
return 0;
}
int ngtcp2_crypto_get_path_challenge_data_cb(ngtcp2_conn *conn, uint8_t *data,
void *user_data) {
(void)conn;
(void)user_data;
if (gnutls_rnd(GNUTLS_RND_RANDOM, data, NGTCP2_PATH_CHALLENGE_DATALEN) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_random(uint8_t *data, size_t datalen) {
if (gnutls_rnd(GNUTLS_RND_RANDOM, data, datalen) != 0) {
return -1;
}
return 0;
}
static int secret_func(gnutls_session_t session,
gnutls_record_encryption_level_t gtls_level,
const void *rx_secret, const void *tx_secret,
size_t secretlen) {
ngtcp2_crypto_conn_ref *conn_ref = gnutls_session_get_ptr(session);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
ngtcp2_crypto_level level =
ngtcp2_crypto_gnutls_from_gnutls_record_encryption_level(gtls_level);
if (rx_secret &&
ngtcp2_crypto_derive_and_install_rx_key(conn, NULL, NULL, NULL, level,
rx_secret, secretlen) != 0) {
return -1;
}
if (tx_secret &&
ngtcp2_crypto_derive_and_install_tx_key(conn, NULL, NULL, NULL, level,
tx_secret, secretlen) != 0) {
return -1;
}
return 0;
}
static int read_func(gnutls_session_t session,
gnutls_record_encryption_level_t gtls_level,
gnutls_handshake_description_t htype, const void *data,
size_t datalen) {
ngtcp2_crypto_conn_ref *conn_ref = gnutls_session_get_ptr(session);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
ngtcp2_crypto_level level =
ngtcp2_crypto_gnutls_from_gnutls_record_encryption_level(gtls_level);
int rv;
if (htype == GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC) {
return 0;
}
rv = ngtcp2_conn_submit_crypto_data(conn, level, data, datalen);
if (rv != 0) {
ngtcp2_conn_set_tls_error(conn, rv);
return -1;
}
return 0;
}
static int alert_read_func(gnutls_session_t session,
gnutls_record_encryption_level_t gtls_level,
gnutls_alert_level_t alert_level,
gnutls_alert_description_t alert_desc) {
ngtcp2_crypto_conn_ref *conn_ref = gnutls_session_get_ptr(session);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
(void)gtls_level;
(void)alert_level;
ngtcp2_conn_set_tls_alert(conn, (uint8_t)alert_desc);
return 0;
}
static int tp_recv_func(gnutls_session_t session, const uint8_t *data,
size_t datalen) {
ngtcp2_crypto_conn_ref *conn_ref = gnutls_session_get_ptr(session);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
int rv;
rv = ngtcp2_conn_decode_remote_transport_params(conn, data, datalen);
if (rv != 0) {
ngtcp2_conn_set_tls_error(conn, rv);
return -1;
}
return 0;
}
static int tp_send_func(gnutls_session_t session, gnutls_buffer_t extdata) {
ngtcp2_crypto_conn_ref *conn_ref = gnutls_session_get_ptr(session);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
uint8_t buf[256];
ngtcp2_ssize nwrite;
int rv;
nwrite = ngtcp2_conn_encode_local_transport_params(conn, buf, sizeof(buf));
if (nwrite < 0) {
return -1;
}
rv = gnutls_buffer_append_data(extdata, buf, (size_t)nwrite);
if (rv != 0) {
return -1;
}
return 0;
}
static int crypto_gnutls_configure_session(gnutls_session_t session) {
int rv;
gnutls_handshake_set_secret_function(session, secret_func);
gnutls_handshake_set_read_function(session, read_func);
gnutls_alert_set_read_function(session, alert_read_func);
rv = gnutls_session_ext_register(
session, "QUIC Transport Parameters",
NGTCP2_TLSEXT_QUIC_TRANSPORT_PARAMETERS_V1, GNUTLS_EXT_TLS, tp_recv_func,
tp_send_func, NULL, NULL, NULL,
GNUTLS_EXT_FLAG_TLS | GNUTLS_EXT_FLAG_CLIENT_HELLO | GNUTLS_EXT_FLAG_EE);
if (rv != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_gnutls_configure_server_session(gnutls_session_t session) {
return crypto_gnutls_configure_session(session);
}
int ngtcp2_crypto_gnutls_configure_client_session(gnutls_session_t session) {
return crypto_gnutls_configure_session(session);
}
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