ssl/s3_enc.c - third_party/openssl - Git at Google

 /* ssl/s3_enc.c */
 /* 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 <stdio.h>
 #include "ssl_locl.h"
 #include <openssl/evp.h>
 #include <openssl/md5.h>

 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 {
     EVP_MD_CTX *m5;
     EVP_MD_CTX *s1;
     unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
     unsigned char c = 'A';
     unsigned int i, j, k;
     int ret = 0;

 #ifdef CHARSET_EBCDIC
     c = os_toascii[c];          /* 'A' in ASCII */
 #endif
     k = 0;
     m5 = EVP_MD_CTX_new();
     s1 = EVP_MD_CTX_new();
     if (m5 == NULL || s1 == NULL) {
         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
         goto err;
     }
     EVP_MD_CTX_set_flags(m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
     for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
         k++;
         if (k > sizeof buf) {
             /* bug: 'buf' is too small for this ciphersuite */
             SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
             return 0;
         }

         for (j = 0; j < k; j++)
             buf[j] = c;
         c++;
         EVP_DigestInit_ex(s1, EVP_sha1(), NULL);
         EVP_DigestUpdate(s1, buf, k);
         EVP_DigestUpdate(s1, s->session->master_key,
                          s->session->master_key_length);
         EVP_DigestUpdate(s1, s->s3->server_random, SSL3_RANDOM_SIZE);
         EVP_DigestUpdate(s1, s->s3->client_random, SSL3_RANDOM_SIZE);
         EVP_DigestFinal_ex(s1, smd, NULL);

         EVP_DigestInit_ex(m5, EVP_md5(), NULL);
         EVP_DigestUpdate(m5, s->session->master_key,
                          s->session->master_key_length);
         EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH);
         if ((int)(i + MD5_DIGEST_LENGTH) > num) {
             EVP_DigestFinal_ex(m5, smd, NULL);
             memcpy(km, smd, (num - i));
         } else
             EVP_DigestFinal_ex(m5, km, NULL);

         km += MD5_DIGEST_LENGTH;
     }
     OPENSSL_cleanse(smd, sizeof(smd));
     ret = 1;
  err:
     EVP_MD_CTX_free(m5);
     EVP_MD_CTX_free(s1);
     return ret;
 }

 int ssl3_change_cipher_state(SSL *s, int which)
 {
     unsigned char *p, *mac_secret;
     unsigned char exp_key[EVP_MAX_KEY_LENGTH];
     unsigned char exp_iv[EVP_MAX_IV_LENGTH];
     unsigned char *ms, *key, *iv;
     EVP_CIPHER_CTX *dd;
     const EVP_CIPHER *c;
 #ifndef OPENSSL_NO_COMP
     COMP_METHOD *comp;
 #endif
     const EVP_MD *m;
     int n, i, j, k, cl;
     int reuse_dd = 0;

     c = s->s3->tmp.new_sym_enc;
     m = s->s3->tmp.new_hash;
     /* m == NULL will lead to a crash later */
     OPENSSL_assert(m);
 #ifndef OPENSSL_NO_COMP
     if (s->s3->tmp.new_compression == NULL)
         comp = NULL;
     else
         comp = s->s3->tmp.new_compression->method;
 #endif

     if (which & SSL3_CC_READ) {
         if (s->enc_read_ctx != NULL)
             reuse_dd = 1;
         else if ((s->enc_read_ctx =
                   OPENSSL_malloc(sizeof(*s->enc_read_ctx))) == NULL)
             goto err;
         else
             /*
              * make sure it's intialized in case we exit later with an error
              */
             EVP_CIPHER_CTX_init(s->enc_read_ctx);
         dd = s->enc_read_ctx;

         if (ssl_replace_hash(&s->read_hash, m) == NULL) {
                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
                 goto err2;
         }
 #ifndef OPENSSL_NO_COMP
         /* COMPRESS */
         COMP_CTX_free(s->expand);
         s->expand = NULL;
         if (comp != NULL) {
             s->expand = COMP_CTX_new(comp);
             if (s->expand == NULL) {
                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
                        SSL_R_COMPRESSION_LIBRARY_ERROR);
                 goto err2;
             }
             if (!RECORD_LAYER_setup_comp_buffer(&s->rlayer))
                 goto err;
         }
 #endif
         RECORD_LAYER_reset_read_sequence(&s->rlayer);
         mac_secret = &(s->s3->read_mac_secret[0]);
     } else {
         if (s->enc_write_ctx != NULL)
             reuse_dd = 1;
         else if ((s->enc_write_ctx =
                   OPENSSL_malloc(sizeof(*s->enc_write_ctx))) == NULL)
             goto err;
         else
             /*
              * make sure it's intialized in case we exit later with an error
              */
             EVP_CIPHER_CTX_init(s->enc_write_ctx);
         dd = s->enc_write_ctx;
         if (ssl_replace_hash(&s->write_hash, m) == NULL) {
                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
                 goto err2;
         }
 #ifndef OPENSSL_NO_COMP
         /* COMPRESS */
         COMP_CTX_free(s->compress);
         s->compress = NULL;
         if (comp != NULL) {
             s->compress = COMP_CTX_new(comp);
             if (s->compress == NULL) {
                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
                        SSL_R_COMPRESSION_LIBRARY_ERROR);
                 goto err2;
             }
         }
 #endif
         RECORD_LAYER_reset_write_sequence(&s->rlayer);
         mac_secret = &(s->s3->write_mac_secret[0]);
     }

     if (reuse_dd)
         EVP_CIPHER_CTX_cleanup(dd);

     p = s->s3->tmp.key_block;
     i = EVP_MD_size(m);
     if (i < 0)
         goto err2;
     cl = EVP_CIPHER_key_length(c);
     j = cl;
     k = EVP_CIPHER_iv_length(c);
     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
         ms = &(p[0]);
         n = i + i;
         key = &(p[n]);
         n += j + j;
         iv = &(p[n]);
         n += k + k;
     } else {
         n = i;
         ms = &(p[n]);
         n += i + j;
         key = &(p[n]);
         n += j + k;
         iv = &(p[n]);
         n += k;
     }

     if (n > s->s3->tmp.key_block_length) {
         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
         goto err2;
     }

     memcpy(mac_secret, ms, i);

     EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE));

 #ifdef OPENSSL_SSL_TRACE_CRYPTO
     if (s->msg_callback) {

         int wh = which & SSL3_CC_WRITE ?
             TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
         s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
                         mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);
         if (c->key_len)
             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
                             key, c->key_len, s, s->msg_callback_arg);
         if (k) {
             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
                             iv, k, s, s->msg_callback_arg);
         }
     }
 #endif

     OPENSSL_cleanse(exp_key, sizeof(exp_key));
     OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
     return (1);
  err:
     SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
  err2:
     OPENSSL_cleanse(exp_key, sizeof(exp_key));
     OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
     return (0);
 }

 int ssl3_setup_key_block(SSL *s)
 {
     unsigned char *p;
     const EVP_CIPHER *c;
     const EVP_MD *hash;
     int num;
     int ret = 0;
     SSL_COMP *comp;

     if (s->s3->tmp.key_block_length != 0)
         return (1);

     if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) {
         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
         return (0);
     }

     s->s3->tmp.new_sym_enc = c;
     s->s3->tmp.new_hash = hash;
 #ifdef OPENSSL_NO_COMP
     s->s3->tmp.new_compression = NULL;
 #else
     s->s3->tmp.new_compression = comp;
 #endif

     num = EVP_MD_size(hash);
     if (num < 0)
         return 0;

     num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
     num *= 2;

     ssl3_cleanup_key_block(s);

     if ((p = OPENSSL_malloc(num)) == NULL)
         goto err;

     s->s3->tmp.key_block_length = num;
     s->s3->tmp.key_block = p;

     ret = ssl3_generate_key_block(s, p, num);

     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
         /*
          * enable vulnerability countermeasure for CBC ciphers with known-IV
          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
          */
         s->s3->need_empty_fragments = 1;

         if (s->session->cipher != NULL) {
             if (s->session->cipher->algorithm_enc == SSL_eNULL)
                 s->s3->need_empty_fragments = 0;

 #ifndef OPENSSL_NO_RC4
             if (s->session->cipher->algorithm_enc == SSL_RC4)
                 s->s3->need_empty_fragments = 0;
 #endif
         }
     }

     return ret;

  err:
     SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
     return (0);
 }

 void ssl3_cleanup_key_block(SSL *s)
 {
     OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
     s->s3->tmp.key_block = NULL;
     s->s3->tmp.key_block_length = 0;
 }

 void ssl3_init_finished_mac(SSL *s)
 {
     ssl3_free_digest_list(s);
     s->s3->handshake_buffer = BIO_new(BIO_s_mem());
     (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
 }

 /*
  * Free digest list. Also frees handshake buffer since they are always freed
  * together.
  */

 void ssl3_free_digest_list(SSL *s)
 {
     BIO_free(s->s3->handshake_buffer);
     s->s3->handshake_buffer = NULL;
     EVP_MD_CTX_free(s->s3->handshake_dgst);
     s->s3->handshake_dgst = NULL;
 }

 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 {
     if (s->s3->handshake_dgst == NULL)
         BIO_write(s->s3->handshake_buffer, (void *)buf, len);
     else
         EVP_DigestUpdate(s->s3->handshake_dgst, buf, len);
 }

 int ssl3_digest_cached_records(SSL *s, int keep)
 {
     const EVP_MD *md;
     long hdatalen;
     void *hdata;

     if (s->s3->handshake_dgst == NULL) {
         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
         if (hdatalen <= 0) {
             SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
             return 0;
         }

         s->s3->handshake_dgst = EVP_MD_CTX_new();
         if (s->s3->handshake_dgst == NULL) {
             SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
             return 0;
         }

         md = ssl_handshake_md(s);
         if (md == NULL) {
             SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);
             return 0;
         }

         EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL);
         EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen);

     }
     if (keep == 0) {
         BIO_free(s->s3->handshake_buffer);
         s->s3->handshake_buffer = NULL;
     }

     return 1;
 }

 int ssl3_final_finish_mac(SSL *s, const char *sender, int len, unsigned char *p)
 {
     int ret;
     EVP_MD_CTX *ctx = NULL;

     if (!ssl3_digest_cached_records(s, 0))
         return 0;

     if (EVP_MD_CTX_type(s->s3->handshake_dgst) != NID_md5_sha1) {
         SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, SSL_R_NO_REQUIRED_DIGEST);
         return 0;
     }

     ctx = EVP_MD_CTX_new();
     if (ctx == NULL) {
         SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     EVP_MD_CTX_copy_ex(ctx, s->s3->handshake_dgst);

     ret = EVP_MD_CTX_size(ctx);
     if (ret < 0) {
         EVP_MD_CTX_reset(ctx);
         return 0;
     }

     if ((sender != NULL && EVP_DigestUpdate(ctx, sender, len) <= 0)
             || EVP_MD_CTX_ctrl(ctx, EVP_CTRL_SSL3_MASTER_SECRET,
                                s->session->master_key_length,
                                s->session->master_key) <= 0
             || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
         SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
         ret = 0;
     }

     EVP_MD_CTX_free(ctx);

     return ret;
 }

 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
                                 int len)
 {
     static const unsigned char *salt[3] = {
 #ifndef CHARSET_EBCDIC
         (const unsigned char *)"A",
         (const unsigned char *)"BB",
         (const unsigned char *)"CCC",
 #else
         (const unsigned char *)"\x41",
         (const unsigned char *)"\x42\x42",
         (const unsigned char *)"\x43\x43\x43",
 #endif
     };
     unsigned char buf[EVP_MAX_MD_SIZE];
     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
     int i, ret = 0;
     unsigned int n;
 #ifdef OPENSSL_SSL_TRACE_CRYPTO
     unsigned char *tmpout = out;
 #endif

     if (ctx == NULL) {
         SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     for (i = 0; i < 3; i++) {
         if (EVP_DigestInit_ex(ctx, s->ctx->sha1, NULL) <= 0
                 || EVP_DigestUpdate(ctx, salt[i],
                                     strlen((const char *)salt[i])) <= 0
                 || EVP_DigestUpdate(ctx, p, len) <= 0
                 || EVP_DigestUpdate(ctx, &(s->s3->client_random[0]),
                                     SSL3_RANDOM_SIZE) <= 0
                 || EVP_DigestUpdate(ctx, &(s->s3->server_random[0]),
                                     SSL3_RANDOM_SIZE) <= 0
                 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0

                 || EVP_DigestInit_ex(ctx, s->ctx->md5, NULL) <= 0
                 || EVP_DigestUpdate(ctx, p, len) <= 0
                 || EVP_DigestUpdate(ctx, buf, n) <= 0
                 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
             SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
             ret = 0;
             break;
         }
         out += n;
         ret += n;
     }
     EVP_MD_CTX_free(ctx);

 #ifdef OPENSSL_SSL_TRACE_CRYPTO
     if (ret > 0 && s->msg_callback) {
         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
                         p, len, s, s->msg_callback_arg);
         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
                         s->s3->client_random, SSL3_RANDOM_SIZE,
                         s, s->msg_callback_arg);
         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
                         s->s3->server_random, SSL3_RANDOM_SIZE,
                         s, s->msg_callback_arg);
         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
                         tmpout, SSL3_MASTER_SECRET_SIZE,
                         s, s->msg_callback_arg);
     }
 #endif
     OPENSSL_cleanse(buf, sizeof(buf));
     return (ret);
 }

 int ssl3_alert_code(int code)
 {
     switch (code) {
     case SSL_AD_CLOSE_NOTIFY:
         return (SSL3_AD_CLOSE_NOTIFY);
     case SSL_AD_UNEXPECTED_MESSAGE:
         return (SSL3_AD_UNEXPECTED_MESSAGE);
     case SSL_AD_BAD_RECORD_MAC:
         return (SSL3_AD_BAD_RECORD_MAC);
     case SSL_AD_DECRYPTION_FAILED:
         return (SSL3_AD_BAD_RECORD_MAC);
     case SSL_AD_RECORD_OVERFLOW:
         return (SSL3_AD_BAD_RECORD_MAC);
     case SSL_AD_DECOMPRESSION_FAILURE:
         return (SSL3_AD_DECOMPRESSION_FAILURE);
     case SSL_AD_HANDSHAKE_FAILURE:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_NO_CERTIFICATE:
         return (SSL3_AD_NO_CERTIFICATE);
     case SSL_AD_BAD_CERTIFICATE:
         return (SSL3_AD_BAD_CERTIFICATE);
     case SSL_AD_UNSUPPORTED_CERTIFICATE:
         return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
     case SSL_AD_CERTIFICATE_REVOKED:
         return (SSL3_AD_CERTIFICATE_REVOKED);
     case SSL_AD_CERTIFICATE_EXPIRED:
         return (SSL3_AD_CERTIFICATE_EXPIRED);
     case SSL_AD_CERTIFICATE_UNKNOWN:
         return (SSL3_AD_CERTIFICATE_UNKNOWN);
     case SSL_AD_ILLEGAL_PARAMETER:
         return (SSL3_AD_ILLEGAL_PARAMETER);
     case SSL_AD_UNKNOWN_CA:
         return (SSL3_AD_BAD_CERTIFICATE);
     case SSL_AD_ACCESS_DENIED:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_DECODE_ERROR:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_DECRYPT_ERROR:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_EXPORT_RESTRICTION:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_PROTOCOL_VERSION:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_INSUFFICIENT_SECURITY:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_INTERNAL_ERROR:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_USER_CANCELLED:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_NO_RENEGOTIATION:
         return (-1);            /* Don't send it :-) */
     case SSL_AD_UNSUPPORTED_EXTENSION:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_UNRECOGNIZED_NAME:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
         return (SSL3_AD_HANDSHAKE_FAILURE);
     case SSL_AD_UNKNOWN_PSK_IDENTITY:
         return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
     case SSL_AD_INAPPROPRIATE_FALLBACK:
         return (TLS1_AD_INAPPROPRIATE_FALLBACK);
     default:
         return (-1);
     }
 }
	/* ssl/s3_enc.c */
	/* 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 <stdio.h>
	#include "ssl_locl.h"
	#include <openssl/evp.h>
	#include <openssl/md5.h>

	static int ssl3_generate_key_block(SSL s, unsigned char km, int num)
	{
	EVP_MD_CTX *m5;
	EVP_MD_CTX *s1;
	unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
	unsigned char c = 'A';
	unsigned int i, j, k;
	int ret = 0;

	#ifdef CHARSET_EBCDIC
	c = os_toascii[c]; /* 'A' in ASCII */
	#endif
	k = 0;
	m5 = EVP_MD_CTX_new();
	s1 = EVP_MD_CTX_new();
	if (m5 == NULL \|\| s1 == NULL) {
	SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	EVP_MD_CTX_set_flags(m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
	for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
	k++;
	if (k > sizeof buf) {
	/* bug: 'buf' is too small for this ciphersuite */
	SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
	return 0;
	}

	for (j = 0; j < k; j++)
	buf[j] = c;
	c++;
	EVP_DigestInit_ex(s1, EVP_sha1(), NULL);
	EVP_DigestUpdate(s1, buf, k);
	EVP_DigestUpdate(s1, s->session->master_key,
	s->session->master_key_length);
	EVP_DigestUpdate(s1, s->s3->server_random, SSL3_RANDOM_SIZE);
	EVP_DigestUpdate(s1, s->s3->client_random, SSL3_RANDOM_SIZE);
	EVP_DigestFinal_ex(s1, smd, NULL);

	EVP_DigestInit_ex(m5, EVP_md5(), NULL);
	EVP_DigestUpdate(m5, s->session->master_key,
	s->session->master_key_length);
	EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH);
	if ((int)(i + MD5_DIGEST_LENGTH) > num) {
	EVP_DigestFinal_ex(m5, smd, NULL);
	memcpy(km, smd, (num - i));
	} else
	EVP_DigestFinal_ex(m5, km, NULL);

	km += MD5_DIGEST_LENGTH;
	}
	OPENSSL_cleanse(smd, sizeof(smd));
	ret = 1;
	err:
	EVP_MD_CTX_free(m5);
	EVP_MD_CTX_free(s1);
	return ret;
	}

	int ssl3_change_cipher_state(SSL *s, int which)
	{
	unsigned char p, mac_secret;
	unsigned char exp_key[EVP_MAX_KEY_LENGTH];
	unsigned char exp_iv[EVP_MAX_IV_LENGTH];
	unsigned char ms, key, *iv;
	EVP_CIPHER_CTX *dd;
	const EVP_CIPHER *c;
	#ifndef OPENSSL_NO_COMP
	COMP_METHOD *comp;
	#endif
	const EVP_MD *m;
	int n, i, j, k, cl;
	int reuse_dd = 0;

	c = s->s3->tmp.new_sym_enc;
	m = s->s3->tmp.new_hash;
	/* m == NULL will lead to a crash later */
	OPENSSL_assert(m);
	#ifndef OPENSSL_NO_COMP
	if (s->s3->tmp.new_compression == NULL)
	comp = NULL;
	else
	comp = s->s3->tmp.new_compression->method;
	#endif

	if (which & SSL3_CC_READ) {
	if (s->enc_read_ctx != NULL)
	reuse_dd = 1;
	else if ((s->enc_read_ctx =
	OPENSSL_malloc(sizeof(*s->enc_read_ctx))) == NULL)
	goto err;
	else
	/*
	* make sure it's intialized in case we exit later with an error
	*/
	EVP_CIPHER_CTX_init(s->enc_read_ctx);
	dd = s->enc_read_ctx;

	if (ssl_replace_hash(&s->read_hash, m) == NULL) {
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
	goto err2;
	}
	#ifndef OPENSSL_NO_COMP
	/* COMPRESS */
	COMP_CTX_free(s->expand);
	s->expand = NULL;
	if (comp != NULL) {
	s->expand = COMP_CTX_new(comp);
	if (s->expand == NULL) {
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
	SSL_R_COMPRESSION_LIBRARY_ERROR);
	goto err2;
	}
	if (!RECORD_LAYER_setup_comp_buffer(&s->rlayer))
	goto err;
	}
	#endif
	RECORD_LAYER_reset_read_sequence(&s->rlayer);
	mac_secret = &(s->s3->read_mac_secret[0]);
	} else {
	if (s->enc_write_ctx != NULL)
	reuse_dd = 1;
	else if ((s->enc_write_ctx =
	OPENSSL_malloc(sizeof(*s->enc_write_ctx))) == NULL)
	goto err;
	else
	/*
	* make sure it's intialized in case we exit later with an error
	*/
	EVP_CIPHER_CTX_init(s->enc_write_ctx);
	dd = s->enc_write_ctx;
	if (ssl_replace_hash(&s->write_hash, m) == NULL) {
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
	goto err2;
	}
	#ifndef OPENSSL_NO_COMP
	/* COMPRESS */
	COMP_CTX_free(s->compress);
	s->compress = NULL;
	if (comp != NULL) {
	s->compress = COMP_CTX_new(comp);
	if (s->compress == NULL) {
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
	SSL_R_COMPRESSION_LIBRARY_ERROR);
	goto err2;
	}
	}
	#endif
	RECORD_LAYER_reset_write_sequence(&s->rlayer);
	mac_secret = &(s->s3->write_mac_secret[0]);
	}

	if (reuse_dd)
	EVP_CIPHER_CTX_cleanup(dd);

	p = s->s3->tmp.key_block;
	i = EVP_MD_size(m);
	if (i < 0)
	goto err2;
	cl = EVP_CIPHER_key_length(c);
	j = cl;
	k = EVP_CIPHER_iv_length(c);
	if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) \|\|
	(which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
	ms = &(p[0]);
	n = i + i;
	key = &(p[n]);
	n += j + j;
	iv = &(p[n]);
	n += k + k;
	} else {
	n = i;
	ms = &(p[n]);
	n += i + j;
	key = &(p[n]);
	n += j + k;
	iv = &(p[n]);
	n += k;
	}

	if (n > s->s3->tmp.key_block_length) {
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
	goto err2;
	}

	memcpy(mac_secret, ms, i);

	EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE));

	#ifdef OPENSSL_SSL_TRACE_CRYPTO
	if (s->msg_callback) {

	int wh = which & SSL3_CC_WRITE ?
	TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
	s->msg_callback(2, s->version, wh \| TLS1_RT_CRYPTO_MAC,
	mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);
	if (c->key_len)
	s->msg_callback(2, s->version, wh \| TLS1_RT_CRYPTO_KEY,
	key, c->key_len, s, s->msg_callback_arg);
	if (k) {
	s->msg_callback(2, s->version, wh \| TLS1_RT_CRYPTO_IV,
	iv, k, s, s->msg_callback_arg);
	}
	}
	#endif

	OPENSSL_cleanse(exp_key, sizeof(exp_key));
	OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
	return (1);
	err:
	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
	err2:
	OPENSSL_cleanse(exp_key, sizeof(exp_key));
	OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
	return (0);
	}

	int ssl3_setup_key_block(SSL *s)
	{
	unsigned char *p;
	const EVP_CIPHER *c;
	const EVP_MD *hash;
	int num;
	int ret = 0;
	SSL_COMP *comp;

	if (s->s3->tmp.key_block_length != 0)
	return (1);

	if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) {
	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
	return (0);
	}

	s->s3->tmp.new_sym_enc = c;
	s->s3->tmp.new_hash = hash;
	#ifdef OPENSSL_NO_COMP
	s->s3->tmp.new_compression = NULL;
	#else
	s->s3->tmp.new_compression = comp;
	#endif

	num = EVP_MD_size(hash);
	if (num < 0)
	return 0;

	num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
	num *= 2;

	ssl3_cleanup_key_block(s);

	if ((p = OPENSSL_malloc(num)) == NULL)
	goto err;

	s->s3->tmp.key_block_length = num;
	s->s3->tmp.key_block = p;

	ret = ssl3_generate_key_block(s, p, num);

	if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
	/*
	* enable vulnerability countermeasure for CBC ciphers with known-IV
	* problem (http://www.openssl.org/~bodo/tls-cbc.txt)
	*/
	s->s3->need_empty_fragments = 1;

	if (s->session->cipher != NULL) {
	if (s->session->cipher->algorithm_enc == SSL_eNULL)
	s->s3->need_empty_fragments = 0;

	#ifndef OPENSSL_NO_RC4
	if (s->session->cipher->algorithm_enc == SSL_RC4)
	s->s3->need_empty_fragments = 0;
	#endif
	}
	}

	return ret;

	err:
	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
	return (0);
	}

	void ssl3_cleanup_key_block(SSL *s)
	{
	OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
	s->s3->tmp.key_block = NULL;
	s->s3->tmp.key_block_length = 0;
	}

	void ssl3_init_finished_mac(SSL *s)
	{
	ssl3_free_digest_list(s);
	s->s3->handshake_buffer = BIO_new(BIO_s_mem());
	(void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
	}

	/*
	* Free digest list. Also frees handshake buffer since they are always freed
	* together.
	*/

	void ssl3_free_digest_list(SSL *s)
	{
	BIO_free(s->s3->handshake_buffer);
	s->s3->handshake_buffer = NULL;
	EVP_MD_CTX_free(s->s3->handshake_dgst);
	s->s3->handshake_dgst = NULL;
	}

	void ssl3_finish_mac(SSL s, const unsigned char buf, int len)
	{
	if (s->s3->handshake_dgst == NULL)
	BIO_write(s->s3->handshake_buffer, (void *)buf, len);
	else
	EVP_DigestUpdate(s->s3->handshake_dgst, buf, len);
	}

	int ssl3_digest_cached_records(SSL *s, int keep)
	{
	const EVP_MD *md;
	long hdatalen;
	void *hdata;

	if (s->s3->handshake_dgst == NULL) {
	hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
	if (hdatalen <= 0) {
	SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
	return 0;
	}

	s->s3->handshake_dgst = EVP_MD_CTX_new();
	if (s->s3->handshake_dgst == NULL) {
	SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
	return 0;
	}

	md = ssl_handshake_md(s);
	if (md == NULL) {
	SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);
	return 0;
	}

	EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL);
	EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen);

	}
	if (keep == 0) {
	BIO_free(s->s3->handshake_buffer);
	s->s3->handshake_buffer = NULL;
	}

	return 1;
	}

	int ssl3_final_finish_mac(SSL s, const char sender, int len, unsigned char *p)
	{
	int ret;
	EVP_MD_CTX *ctx = NULL;

	if (!ssl3_digest_cached_records(s, 0))
	return 0;

	if (EVP_MD_CTX_type(s->s3->handshake_dgst) != NID_md5_sha1) {
	SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, SSL_R_NO_REQUIRED_DIGEST);
	return 0;
	}

	ctx = EVP_MD_CTX_new();
	if (ctx == NULL) {
	SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	EVP_MD_CTX_copy_ex(ctx, s->s3->handshake_dgst);

	ret = EVP_MD_CTX_size(ctx);
	if (ret < 0) {
	EVP_MD_CTX_reset(ctx);
	return 0;
	}

	if ((sender != NULL && EVP_DigestUpdate(ctx, sender, len) <= 0)
	\|\| EVP_MD_CTX_ctrl(ctx, EVP_CTRL_SSL3_MASTER_SECRET,
	s->session->master_key_length,
	s->session->master_key) <= 0
	\|\| EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
	SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
	ret = 0;
	}

	EVP_MD_CTX_free(ctx);

	return ret;
	}

	int ssl3_generate_master_secret(SSL s, unsigned char out, unsigned char *p,
	int len)
	{
	static const unsigned char *salt[3] = {
	#ifndef CHARSET_EBCDIC
	(const unsigned char *)"A",
	(const unsigned char *)"BB",
	(const unsigned char *)"CCC",
	#else
	(const unsigned char *)"\x41",
	(const unsigned char *)"\x42\x42",
	(const unsigned char *)"\x43\x43\x43",
	#endif
	};
	unsigned char buf[EVP_MAX_MD_SIZE];
	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
	int i, ret = 0;
	unsigned int n;
	#ifdef OPENSSL_SSL_TRACE_CRYPTO
	unsigned char *tmpout = out;
	#endif

	if (ctx == NULL) {
	SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	for (i = 0; i < 3; i++) {
	if (EVP_DigestInit_ex(ctx, s->ctx->sha1, NULL) <= 0
	\|\| EVP_DigestUpdate(ctx, salt[i],
	strlen((const char *)salt[i])) <= 0
	\|\| EVP_DigestUpdate(ctx, p, len) <= 0
	\|\| EVP_DigestUpdate(ctx, &(s->s3->client_random[0]),
	SSL3_RANDOM_SIZE) <= 0
	\|\| EVP_DigestUpdate(ctx, &(s->s3->server_random[0]),
	SSL3_RANDOM_SIZE) <= 0
	\|\| EVP_DigestFinal_ex(ctx, buf, &n) <= 0

	\|\| EVP_DigestInit_ex(ctx, s->ctx->md5, NULL) <= 0
	\|\| EVP_DigestUpdate(ctx, p, len) <= 0
	\|\| EVP_DigestUpdate(ctx, buf, n) <= 0
	\|\| EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
	SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
	ret = 0;
	break;
	}
	out += n;
	ret += n;
	}
	EVP_MD_CTX_free(ctx);

	#ifdef OPENSSL_SSL_TRACE_CRYPTO
	if (ret > 0 && s->msg_callback) {
	s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
	p, len, s, s->msg_callback_arg);
	s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
	s->s3->client_random, SSL3_RANDOM_SIZE,
	s, s->msg_callback_arg);
	s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
	s->s3->server_random, SSL3_RANDOM_SIZE,
	s, s->msg_callback_arg);
	s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
	tmpout, SSL3_MASTER_SECRET_SIZE,
	s, s->msg_callback_arg);
	}
	#endif
	OPENSSL_cleanse(buf, sizeof(buf));
	return (ret);
	}

	int ssl3_alert_code(int code)
	{
	switch (code) {
	case SSL_AD_CLOSE_NOTIFY:
	return (SSL3_AD_CLOSE_NOTIFY);
	case SSL_AD_UNEXPECTED_MESSAGE:
	return (SSL3_AD_UNEXPECTED_MESSAGE);
	case SSL_AD_BAD_RECORD_MAC:
	return (SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_DECRYPTION_FAILED:
	return (SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_RECORD_OVERFLOW:
	return (SSL3_AD_BAD_RECORD_MAC);
	case SSL_AD_DECOMPRESSION_FAILURE:
	return (SSL3_AD_DECOMPRESSION_FAILURE);
	case SSL_AD_HANDSHAKE_FAILURE:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_NO_CERTIFICATE:
	return (SSL3_AD_NO_CERTIFICATE);
	case SSL_AD_BAD_CERTIFICATE:
	return (SSL3_AD_BAD_CERTIFICATE);
	case SSL_AD_UNSUPPORTED_CERTIFICATE:
	return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
	case SSL_AD_CERTIFICATE_REVOKED:
	return (SSL3_AD_CERTIFICATE_REVOKED);
	case SSL_AD_CERTIFICATE_EXPIRED:
	return (SSL3_AD_CERTIFICATE_EXPIRED);
	case SSL_AD_CERTIFICATE_UNKNOWN:
	return (SSL3_AD_CERTIFICATE_UNKNOWN);
	case SSL_AD_ILLEGAL_PARAMETER:
	return (SSL3_AD_ILLEGAL_PARAMETER);
	case SSL_AD_UNKNOWN_CA:
	return (SSL3_AD_BAD_CERTIFICATE);
	case SSL_AD_ACCESS_DENIED:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_DECODE_ERROR:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_DECRYPT_ERROR:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_EXPORT_RESTRICTION:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_PROTOCOL_VERSION:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_INSUFFICIENT_SECURITY:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_INTERNAL_ERROR:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_USER_CANCELLED:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_NO_RENEGOTIATION:
	return (-1); /* Don't send it :-) */
	case SSL_AD_UNSUPPORTED_EXTENSION:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_CERTIFICATE_UNOBTAINABLE:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_UNRECOGNIZED_NAME:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
	return (SSL3_AD_HANDSHAKE_FAILURE);
	case SSL_AD_UNKNOWN_PSK_IDENTITY:
	return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
	case SSL_AD_INAPPROPRIATE_FALLBACK:
	return (TLS1_AD_INAPPROPRIATE_FALLBACK);
	default:
	return (-1);
	}
	}