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s3_enc.c

/* 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) 1998-2002 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).
 *
 */

#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/evp.h>
#include <openssl/md5.h>

static unsigned char ssl3_pad_1[48]={
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
      0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };

static unsigned char ssl3_pad_2[48]={
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
      0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };

static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
      const char *sender, int len, unsigned char *p);

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;

#ifdef CHARSET_EBCDIC
      c = os_toascii[c]; /*'A' in ASCII */
#endif
      k=0;
      EVP_MD_CTX_init(&m5);
      EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
      EVP_MD_CTX_init(&s1);
      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,SHA_DIGEST_LENGTH);
      EVP_MD_CTX_cleanup(&m5);
      EVP_MD_CTX_cleanup(&s1);
      return 1;
      }

int ssl3_change_cipher_state(SSL *s, int which)
      {
      unsigned char *p,*key_block,*mac_secret;
      unsigned char exp_key[EVP_MAX_KEY_LENGTH];
      unsigned char exp_iv[EVP_MAX_IV_LENGTH];
      unsigned char *ms,*key,*iv,*er1,*er2;
      EVP_CIPHER_CTX *dd;
      const EVP_CIPHER *c;
#ifndef OPENSSL_NO_COMP
      COMP_METHOD *comp;
#endif
      const EVP_MD *m;
      EVP_MD_CTX md;
      int is_exp,n,i,j,k,cl;
      int reuse_dd = 0;

      is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
      c=s->s3->tmp.new_sym_enc;
      m=s->s3->tmp.new_hash;
#ifndef OPENSSL_NO_COMP
      if (s->s3->tmp.new_compression == NULL)
            comp=NULL;
      else
            comp=s->s3->tmp.new_compression->method;
#endif
      key_block=s->s3->tmp.key_block;

      if (which & SSL3_CC_READ)
            {
            if (s->enc_read_ctx != NULL)
                  reuse_dd = 1;
            else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_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;
            s->read_hash=m;
#ifndef OPENSSL_NO_COMP
            /* COMPRESS */
            if (s->expand != NULL)
                  {
                  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 (s->s3->rrec.comp == NULL)
                        s->s3->rrec.comp=(unsigned char *)
                              OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
                  if (s->s3->rrec.comp == NULL)
                        goto err;
                  }
#endif
            memset(&(s->s3->read_sequence[0]),0,8);
            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(EVP_CIPHER_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;
            s->write_hash=m;
#ifndef OPENSSL_NO_COMP
            /* COMPRESS */
            if (s->compress != NULL)
                  {
                  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
            memset(&(s->s3->write_sequence[0]),0,8);
            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);
      cl=EVP_CIPHER_key_length(c);
      j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
             cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
      /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
      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;
            er1= &(s->s3->client_random[0]);
            er2= &(s->s3->server_random[0]);
            }
      else
            {
            n=i;
            ms=  &(p[ n]); n+=i+j;
            key= &(p[ n]); n+=j+k;
            iv=  &(p[ n]); n+=k;
            er1= &(s->s3->server_random[0]);
            er2= &(s->s3->client_random[0]);
            }

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

      EVP_MD_CTX_init(&md);
      memcpy(mac_secret,ms,i);
      if (is_exp)
            {
            /* In here I set both the read and write key/iv to the
             * same value since only the correct one will be used :-).
             */
            EVP_DigestInit_ex(&md,EVP_md5(), NULL);
            EVP_DigestUpdate(&md,key,j);
            EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
            EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
            EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
            key= &(exp_key[0]);

            if (k > 0)
                  {
                  EVP_DigestInit_ex(&md,EVP_md5(), NULL);
                  EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
                  EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
                  EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
                  iv= &(exp_iv[0]);
                  }
            }

      s->session->key_arg_length=0;

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

      OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
      OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
      EVP_MD_CTX_cleanup(&md);
      return(1);
err:
      SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
err2:
      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,&comp))
            {
            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_CIPHER_key_length(c)+EVP_MD_size(hash)+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->algorithms & SSL_ENC_MASK) == SSL_eNULL)
                        s->s3->need_empty_fragments = 0;
                  
#ifndef OPENSSL_NO_RC4
                  if ((s->session->cipher->algorithms & SSL_ENC_MASK) == 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)
      {
      if (s->s3->tmp.key_block != NULL)
            {
            OPENSSL_cleanse(s->s3->tmp.key_block,
                  s->s3->tmp.key_block_length);
            OPENSSL_free(s->s3->tmp.key_block);
            s->s3->tmp.key_block=NULL;
            }
      s->s3->tmp.key_block_length=0;
      }

int ssl3_enc(SSL *s, int send)
      {
      SSL3_RECORD *rec;
      EVP_CIPHER_CTX *ds;
      unsigned long l;
      int bs,i;
      const EVP_CIPHER *enc;

      if (send)
            {
            ds=s->enc_write_ctx;
            rec= &(s->s3->wrec);
            if (s->enc_write_ctx == NULL)
                  enc=NULL;
            else
                  enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
            }
      else
            {
            ds=s->enc_read_ctx;
            rec= &(s->s3->rrec);
            if (s->enc_read_ctx == NULL)
                  enc=NULL;
            else
                  enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
            }

      if ((s->session == NULL) || (ds == NULL) ||
            (enc == NULL))
            {
            memmove(rec->data,rec->input,rec->length);
            rec->input=rec->data;
            }
      else
            {
            l=rec->length;
            bs=EVP_CIPHER_block_size(ds->cipher);

            /* COMPRESS */

            if ((bs != 1) && send)
                  {
                  i=bs-((int)l%bs);

                  /* we need to add 'i-1' padding bytes */
                  l+=i;
                  rec->length+=i;
                  rec->input[l-1]=(i-1);
                  }
            
            if (!send)
                  {
                  if (l == 0 || l%bs != 0)
                        {
                        SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
                        return 0;
                        }
                  /* otherwise, rec->length >= bs */
                  }
            
            EVP_Cipher(ds,rec->data,rec->input,l);

            if ((bs != 1) && !send)
                  {
                  i=rec->data[l-1]+1;
                  /* SSL 3.0 bounds the number of padding bytes by the block size;
                   * padding bytes (except the last one) are arbitrary */
                  if (i > bs)
                        {
                        /* Incorrect padding. SSLerr() and ssl3_alert are done
                         * by caller: we don't want to reveal whether this is
                         * a decryption error or a MAC verification failure
                         * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
                        return -1;
                        }
                  /* now i <= bs <= rec->length */
                  rec->length-=i;
                  }
            }
      return(1);
      }

void ssl3_init_finished_mac(SSL *s)
      {
      EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1),
            EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
      EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
      EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
      }

void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
      {
      EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
      EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
      }

int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
      {
      return(ssl3_handshake_mac(s,ctx,NULL,0,p));
      }

int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
           const char *sender, int len, unsigned char *p)
      {
      int ret;

      ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
      p+=ret;
      ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
      return(ret);
      }

static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
           const char *sender, int len, unsigned char *p)
      {
      unsigned int ret;
      int npad,n;
      unsigned int i;
      unsigned char md_buf[EVP_MAX_MD_SIZE];
      EVP_MD_CTX ctx;

      EVP_MD_CTX_init(&ctx);
      EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
      EVP_MD_CTX_copy_ex(&ctx,in_ctx);

      n=EVP_MD_CTX_size(&ctx);
      npad=(48/n)*n;

      if (sender != NULL)
            EVP_DigestUpdate(&ctx,sender,len);
      EVP_DigestUpdate(&ctx,s->session->master_key,
            s->session->master_key_length);
      EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
      EVP_DigestFinal_ex(&ctx,md_buf,&i);

      EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
      EVP_DigestUpdate(&ctx,s->session->master_key,
            s->session->master_key_length);
      EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
      EVP_DigestUpdate(&ctx,md_buf,i);
      EVP_DigestFinal_ex(&ctx,p,&ret);

      EVP_MD_CTX_cleanup(&ctx);

      return((int)ret);
      }

int ssl3_mac(SSL *ssl, unsigned char *md, int send)
      {
      SSL3_RECORD *rec;
      unsigned char *mac_sec,*seq;
      EVP_MD_CTX md_ctx;
      const EVP_MD *hash;
      unsigned char *p,rec_char;
      unsigned int md_size;
      int npad;

      if (send)
            {
            rec= &(ssl->s3->wrec);
            mac_sec= &(ssl->s3->write_mac_secret[0]);
            seq= &(ssl->s3->write_sequence[0]);
            hash=ssl->write_hash;
            }
      else
            {
            rec= &(ssl->s3->rrec);
            mac_sec= &(ssl->s3->read_mac_secret[0]);
            seq= &(ssl->s3->read_sequence[0]);
            hash=ssl->read_hash;
            }

      md_size=EVP_MD_size(hash);
      npad=(48/md_size)*md_size;

      /* Chop the digest off the end :-) */
      EVP_MD_CTX_init(&md_ctx);

      EVP_DigestInit_ex(  &md_ctx,hash, NULL);
      EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
      EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
      EVP_DigestUpdate(&md_ctx,seq,8);
      rec_char=rec->type;
      EVP_DigestUpdate(&md_ctx,&rec_char,1);
      p=md;
      s2n(rec->length,p);
      EVP_DigestUpdate(&md_ctx,md,2);
      EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
      EVP_DigestFinal_ex( &md_ctx,md,NULL);

      EVP_DigestInit_ex(  &md_ctx,hash, NULL);
      EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
      EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
      EVP_DigestUpdate(&md_ctx,md,md_size);
      EVP_DigestFinal_ex( &md_ctx,md,&md_size);

      EVP_MD_CTX_cleanup(&md_ctx);

      ssl3_record_sequence_update(seq);
      return(md_size);
      }

void ssl3_record_sequence_update(unsigned char *seq)
      {
      int i;

      for (i=7; i>=0; i--)
            {
            ++seq[i];
            if (seq[i] != 0) break; 
            }
      }

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;
      int i,ret=0;
      unsigned int n;

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

            EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
            EVP_DigestUpdate(&ctx,p,len);
            EVP_DigestUpdate(&ctx,buf,n);
            EVP_DigestFinal_ex(&ctx,out,&n);
            out+=n;
            ret+=n;
            }
      EVP_MD_CTX_cleanup(&ctx);
      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 :-) */
      default:                return(-1);
            }
      }


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