| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * openssl-core@openssl.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). |
| * |
| */ |
| /* ==================================================================== |
| * Copyright 2005 Nokia. All rights reserved. |
| * |
| * The portions of the attached software ("Contribution") is developed by |
| * Nokia Corporation and is licensed pursuant to the OpenSSL open source |
| * license. |
| * |
| * The Contribution, originally written by Mika Kousa and Pasi Eronen of |
| * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites |
| * support (see RFC 4279) to OpenSSL. |
| * |
| * No patent licenses or other rights except those expressly stated in |
| * the OpenSSL open source license shall be deemed granted or received |
| * expressly, by implication, estoppel, or otherwise. |
| * |
| * No assurances are provided by Nokia that the Contribution does not |
| * infringe the patent or other intellectual property rights of any third |
| * party or that the license provides you with all the necessary rights |
| * to make use of the Contribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN |
| * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA |
| * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY |
| * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR |
| * OTHERWISE. */ |
| |
| #include <openssl/ssl.h> |
| |
| #include <assert.h> |
| #include <string.h> |
| |
| #include <utility> |
| |
| #include <openssl/err.h> |
| #include <openssl/evp.h> |
| #include <openssl/hmac.h> |
| #include <openssl/md5.h> |
| #include <openssl/mem.h> |
| #include <openssl/nid.h> |
| #include <openssl/rand.h> |
| |
| #include "../crypto/internal.h" |
| #include "internal.h" |
| |
| |
| namespace bssl { |
| |
| // tls1_P_hash computes the TLS P_<hash> function as described in RFC 5246, |
| // section 5. It XORs |out_len| bytes to |out|, using |md| as the hash and |
| // |secret| as the secret. |seed1| through |seed3| are concatenated to form the |
| // seed parameter. It returns one on success and zero on failure. |
| static int tls1_P_hash(uint8_t *out, size_t out_len, const EVP_MD *md, |
| const uint8_t *secret, size_t secret_len, |
| const uint8_t *seed1, size_t seed1_len, |
| const uint8_t *seed2, size_t seed2_len, |
| const uint8_t *seed3, size_t seed3_len) { |
| ScopedHMAC_CTX ctx, ctx_tmp, ctx_init; |
| uint8_t A1[EVP_MAX_MD_SIZE]; |
| unsigned A1_len; |
| int ret = 0; |
| |
| size_t chunk = EVP_MD_size(md); |
| |
| if (!HMAC_Init_ex(ctx_init.get(), secret, secret_len, md, NULL) || |
| !HMAC_CTX_copy_ex(ctx.get(), ctx_init.get()) || |
| !HMAC_Update(ctx.get(), seed1, seed1_len) || |
| !HMAC_Update(ctx.get(), seed2, seed2_len) || |
| !HMAC_Update(ctx.get(), seed3, seed3_len) || |
| !HMAC_Final(ctx.get(), A1, &A1_len)) { |
| goto err; |
| } |
| |
| for (;;) { |
| unsigned len; |
| uint8_t hmac[EVP_MAX_MD_SIZE]; |
| if (!HMAC_CTX_copy_ex(ctx.get(), ctx_init.get()) || |
| !HMAC_Update(ctx.get(), A1, A1_len) || |
| // Save a copy of |ctx| to compute the next A1 value below. |
| (out_len > chunk && !HMAC_CTX_copy_ex(ctx_tmp.get(), ctx.get())) || |
| !HMAC_Update(ctx.get(), seed1, seed1_len) || |
| !HMAC_Update(ctx.get(), seed2, seed2_len) || |
| !HMAC_Update(ctx.get(), seed3, seed3_len) || |
| !HMAC_Final(ctx.get(), hmac, &len)) { |
| goto err; |
| } |
| assert(len == chunk); |
| |
| // XOR the result into |out|. |
| if (len > out_len) { |
| len = out_len; |
| } |
| unsigned i; |
| for (i = 0; i < len; i++) { |
| out[i] ^= hmac[i]; |
| } |
| out += len; |
| out_len -= len; |
| |
| if (out_len == 0) { |
| break; |
| } |
| |
| // Calculate the next A1 value. |
| if (!HMAC_Final(ctx_tmp.get(), A1, &A1_len)) { |
| goto err; |
| } |
| } |
| |
| ret = 1; |
| |
| err: |
| OPENSSL_cleanse(A1, sizeof(A1)); |
| return ret; |
| } |
| |
| int tls1_prf(const EVP_MD *digest, uint8_t *out, size_t out_len, |
| const uint8_t *secret, size_t secret_len, const char *label, |
| size_t label_len, const uint8_t *seed1, size_t seed1_len, |
| const uint8_t *seed2, size_t seed2_len) { |
| if (out_len == 0) { |
| return 1; |
| } |
| |
| OPENSSL_memset(out, 0, out_len); |
| |
| if (digest == EVP_md5_sha1()) { |
| // If using the MD5/SHA1 PRF, |secret| is partitioned between SHA-1 and |
| // MD5, MD5 first. |
| size_t secret_half = secret_len - (secret_len / 2); |
| if (!tls1_P_hash(out, out_len, EVP_md5(), secret, secret_half, |
| (const uint8_t *)label, label_len, seed1, seed1_len, seed2, |
| seed2_len)) { |
| return 0; |
| } |
| |
| // Note that, if |secret_len| is odd, the two halves share a byte. |
| secret = secret + (secret_len - secret_half); |
| secret_len = secret_half; |
| |
| digest = EVP_sha1(); |
| } |
| |
| if (!tls1_P_hash(out, out_len, digest, secret, secret_len, |
| (const uint8_t *)label, label_len, seed1, seed1_len, seed2, |
| seed2_len)) { |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int ssl3_prf(uint8_t *out, size_t out_len, const uint8_t *secret, |
| size_t secret_len, const char *label, size_t label_len, |
| const uint8_t *seed1, size_t seed1_len, |
| const uint8_t *seed2, size_t seed2_len) { |
| ScopedEVP_MD_CTX md5; |
| ScopedEVP_MD_CTX sha1; |
| uint8_t buf[16], smd[SHA_DIGEST_LENGTH]; |
| uint8_t c = 'A'; |
| size_t i, j, k; |
| |
| k = 0; |
| for (i = 0; i < out_len; i += MD5_DIGEST_LENGTH) { |
| k++; |
| if (k > sizeof(buf)) { |
| // bug: 'buf' is too small for this ciphersuite |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| |
| for (j = 0; j < k; j++) { |
| buf[j] = c; |
| } |
| c++; |
| if (!EVP_DigestInit_ex(sha1.get(), EVP_sha1(), NULL)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_LIB_EVP); |
| return 0; |
| } |
| EVP_DigestUpdate(sha1.get(), buf, k); |
| EVP_DigestUpdate(sha1.get(), secret, secret_len); |
| // |label| is ignored for SSLv3. |
| if (seed1_len) { |
| EVP_DigestUpdate(sha1.get(), seed1, seed1_len); |
| } |
| if (seed2_len) { |
| EVP_DigestUpdate(sha1.get(), seed2, seed2_len); |
| } |
| EVP_DigestFinal_ex(sha1.get(), smd, NULL); |
| |
| if (!EVP_DigestInit_ex(md5.get(), EVP_md5(), NULL)) { |
| OPENSSL_PUT_ERROR(SSL, ERR_LIB_EVP); |
| return 0; |
| } |
| EVP_DigestUpdate(md5.get(), secret, secret_len); |
| EVP_DigestUpdate(md5.get(), smd, SHA_DIGEST_LENGTH); |
| if (i + MD5_DIGEST_LENGTH > out_len) { |
| EVP_DigestFinal_ex(md5.get(), smd, NULL); |
| OPENSSL_memcpy(out, smd, out_len - i); |
| } else { |
| EVP_DigestFinal_ex(md5.get(), out, NULL); |
| } |
| |
| out += MD5_DIGEST_LENGTH; |
| } |
| |
| OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH); |
| return 1; |
| } |
| |
| static int tls1_setup_key_block(SSL_HANDSHAKE *hs) { |
| SSL *const ssl = hs->ssl; |
| if (hs->key_block_len != 0) { |
| return 1; |
| } |
| |
| SSL_SESSION *session = ssl->session; |
| if (hs->new_session) { |
| session = hs->new_session.get(); |
| } |
| |
| const EVP_AEAD *aead = NULL; |
| size_t mac_secret_len, fixed_iv_len; |
| if (session->cipher == NULL || |
| !ssl_cipher_get_evp_aead(&aead, &mac_secret_len, &fixed_iv_len, |
| session->cipher, ssl3_protocol_version(ssl), |
| SSL_is_dtls(ssl))) { |
| OPENSSL_PUT_ERROR(SSL, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); |
| return 0; |
| } |
| size_t key_len = EVP_AEAD_key_length(aead); |
| if (mac_secret_len > 0) { |
| // For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the |
| // key length reported by |EVP_AEAD_key_length| will include the MAC key |
| // bytes and initial implicit IV. |
| if (key_len < mac_secret_len + fixed_iv_len) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| return 0; |
| } |
| key_len -= mac_secret_len + fixed_iv_len; |
| } |
| |
| assert(mac_secret_len < 256); |
| assert(key_len < 256); |
| assert(fixed_iv_len < 256); |
| |
| ssl->s3->tmp.new_mac_secret_len = (uint8_t)mac_secret_len; |
| ssl->s3->tmp.new_key_len = (uint8_t)key_len; |
| ssl->s3->tmp.new_fixed_iv_len = (uint8_t)fixed_iv_len; |
| |
| size_t key_block_len = SSL_get_key_block_len(ssl); |
| |
| uint8_t *keyblock = (uint8_t *)OPENSSL_malloc(key_block_len); |
| if (keyblock == NULL) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| |
| if (!SSL_generate_key_block(ssl, keyblock, key_block_len)) { |
| OPENSSL_free(keyblock); |
| return 0; |
| } |
| |
| assert(key_block_len < 256); |
| hs->key_block_len = (uint8_t)key_block_len; |
| hs->key_block = keyblock; |
| return 1; |
| } |
| |
| int tls1_change_cipher_state(SSL_HANDSHAKE *hs, int which) { |
| SSL *const ssl = hs->ssl; |
| // Ensure the key block is set up. |
| if (!tls1_setup_key_block(hs)) { |
| return 0; |
| } |
| |
| // is_read is true if we have just read a ChangeCipherSpec message - i.e. we |
| // need to update the read cipherspec. Otherwise we have just written one. |
| const char is_read = (which & SSL3_CC_READ) != 0; |
| // use_client_keys is true if we wish to use the keys for the "client write" |
| // direction. This is the case if we're a client sending a ChangeCipherSpec, |
| // or a server reading a client's ChangeCipherSpec. |
| const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE || |
| which == SSL3_CHANGE_CIPHER_SERVER_READ; |
| |
| size_t mac_secret_len = ssl->s3->tmp.new_mac_secret_len; |
| size_t key_len = ssl->s3->tmp.new_key_len; |
| size_t iv_len = ssl->s3->tmp.new_fixed_iv_len; |
| assert((mac_secret_len + key_len + iv_len) * 2 == hs->key_block_len); |
| |
| const uint8_t *key_data = hs->key_block; |
| const uint8_t *client_write_mac_secret = key_data; |
| key_data += mac_secret_len; |
| const uint8_t *server_write_mac_secret = key_data; |
| key_data += mac_secret_len; |
| const uint8_t *client_write_key = key_data; |
| key_data += key_len; |
| const uint8_t *server_write_key = key_data; |
| key_data += key_len; |
| const uint8_t *client_write_iv = key_data; |
| key_data += iv_len; |
| const uint8_t *server_write_iv = key_data; |
| key_data += iv_len; |
| |
| const uint8_t *mac_secret, *key, *iv; |
| if (use_client_keys) { |
| mac_secret = client_write_mac_secret; |
| key = client_write_key; |
| iv = client_write_iv; |
| } else { |
| mac_secret = server_write_mac_secret; |
| key = server_write_key; |
| iv = server_write_iv; |
| } |
| |
| UniquePtr<SSLAEADContext> aead_ctx = SSLAEADContext::Create( |
| is_read ? evp_aead_open : evp_aead_seal, ssl3_protocol_version(ssl), |
| SSL_is_dtls(ssl), hs->new_cipher, key, key_len, mac_secret, |
| mac_secret_len, iv, iv_len); |
| if (!aead_ctx) { |
| return 0; |
| } |
| |
| if (is_read) { |
| return ssl->method->set_read_state(ssl, std::move(aead_ctx)); |
| } |
| |
| return ssl->method->set_write_state(ssl, std::move(aead_ctx)); |
| } |
| |
| int tls1_generate_master_secret(SSL_HANDSHAKE *hs, uint8_t *out, |
| const uint8_t *premaster, |
| size_t premaster_len) { |
| const SSL *ssl = hs->ssl; |
| if (hs->extended_master_secret) { |
| uint8_t digests[EVP_MAX_MD_SIZE]; |
| size_t digests_len; |
| if (!hs->transcript.GetHash(digests, &digests_len) || |
| !tls1_prf(hs->transcript.Digest(), out, SSL3_MASTER_SECRET_SIZE, |
| premaster, premaster_len, TLS_MD_EXTENDED_MASTER_SECRET_CONST, |
| TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests, |
| digests_len, NULL, 0)) { |
| return 0; |
| } |
| } else { |
| if (ssl3_protocol_version(ssl) == SSL3_VERSION) { |
| if (!ssl3_prf(out, SSL3_MASTER_SECRET_SIZE, premaster, premaster_len, |
| TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, |
| ssl->s3->client_random, SSL3_RANDOM_SIZE, |
| ssl->s3->server_random, SSL3_RANDOM_SIZE)) { |
| return 0; |
| } |
| } else { |
| if (!tls1_prf(hs->transcript.Digest(), out, SSL3_MASTER_SECRET_SIZE, |
| premaster, premaster_len, TLS_MD_MASTER_SECRET_CONST, |
| TLS_MD_MASTER_SECRET_CONST_SIZE, ssl->s3->client_random, |
| SSL3_RANDOM_SIZE, ssl->s3->server_random, |
| SSL3_RANDOM_SIZE)) { |
| return 0; |
| } |
| } |
| } |
| |
| return SSL3_MASTER_SECRET_SIZE; |
| } |
| |
| } // namespace bssl |
| |
| using namespace bssl; |
| |
| size_t SSL_get_key_block_len(const SSL *ssl) { |
| return 2 * ((size_t)ssl->s3->tmp.new_mac_secret_len + |
| (size_t)ssl->s3->tmp.new_key_len + |
| (size_t)ssl->s3->tmp.new_fixed_iv_len); |
| } |
| |
| int SSL_generate_key_block(const SSL *ssl, uint8_t *out, size_t out_len) { |
| const SSL_SESSION *session = SSL_get_session(ssl); |
| if (ssl3_protocol_version(ssl) == SSL3_VERSION) { |
| return ssl3_prf(out, out_len, session->master_key, |
| session->master_key_length, TLS_MD_KEY_EXPANSION_CONST, |
| TLS_MD_KEY_EXPANSION_CONST_SIZE, ssl->s3->server_random, |
| SSL3_RANDOM_SIZE, ssl->s3->client_random, SSL3_RANDOM_SIZE); |
| } |
| |
| const EVP_MD *digest = SSL_SESSION_get_digest(session); |
| return tls1_prf(digest, out, out_len, session->master_key, |
| session->master_key_length, TLS_MD_KEY_EXPANSION_CONST, |
| TLS_MD_KEY_EXPANSION_CONST_SIZE, ssl->s3->server_random, |
| SSL3_RANDOM_SIZE, ssl->s3->client_random, SSL3_RANDOM_SIZE); |
| } |
| |
| int SSL_export_keying_material(SSL *ssl, uint8_t *out, size_t out_len, |
| const char *label, size_t label_len, |
| const uint8_t *context, size_t context_len, |
| int use_context) { |
| if (!ssl->s3->have_version || ssl->version == SSL3_VERSION) { |
| return 0; |
| } |
| |
| // Exporters may not be used in the middle of a renegotiation. |
| if (SSL_in_init(ssl) && !SSL_in_false_start(ssl)) { |
| return 0; |
| } |
| |
| if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) { |
| return tls13_export_keying_material(ssl, out, out_len, label, label_len, |
| context, context_len, use_context); |
| } |
| |
| size_t seed_len = 2 * SSL3_RANDOM_SIZE; |
| if (use_context) { |
| if (context_len >= 1u << 16) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); |
| return 0; |
| } |
| seed_len += 2 + context_len; |
| } |
| uint8_t *seed = (uint8_t *)OPENSSL_malloc(seed_len); |
| if (seed == NULL) { |
| OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| |
| OPENSSL_memcpy(seed, ssl->s3->client_random, SSL3_RANDOM_SIZE); |
| OPENSSL_memcpy(seed + SSL3_RANDOM_SIZE, ssl->s3->server_random, |
| SSL3_RANDOM_SIZE); |
| if (use_context) { |
| seed[2 * SSL3_RANDOM_SIZE] = (uint8_t)(context_len >> 8); |
| seed[2 * SSL3_RANDOM_SIZE + 1] = (uint8_t)context_len; |
| OPENSSL_memcpy(seed + 2 * SSL3_RANDOM_SIZE + 2, context, context_len); |
| } |
| |
| const SSL_SESSION *session = SSL_get_session(ssl); |
| const EVP_MD *digest = SSL_SESSION_get_digest(session); |
| int ret = tls1_prf(digest, out, out_len, session->master_key, |
| session->master_key_length, label, label_len, seed, |
| seed_len, NULL, 0); |
| OPENSSL_free(seed); |
| return ret; |
| } |