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t1_enc.c

/* ssl/t1_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/comp.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/fips.h>

static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
                  int sec_len, unsigned char *seed, int seed_len,
                  unsigned char *out, int olen)
      {
      int chunk,n;
      unsigned int j;
      HMAC_CTX ctx;
      HMAC_CTX ctx_tmp;
      unsigned char A1[EVP_MAX_MD_SIZE];
      unsigned int A1_len;
      
      chunk=EVP_MD_size(md);

      HMAC_CTX_init(&ctx);
      HMAC_CTX_init(&ctx_tmp);
      HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
      HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
      HMAC_Update(&ctx,seed,seed_len);
      HMAC_Final(&ctx,A1,&A1_len);

      n=0;
      for (;;)
            {
            HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
            HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
            HMAC_Update(&ctx,A1,A1_len);
            HMAC_Update(&ctx_tmp,A1,A1_len);
            HMAC_Update(&ctx,seed,seed_len);

            if (olen > chunk)
                  {
                  HMAC_Final(&ctx,out,&j);
                  out+=j;
                  olen-=j;
                  HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
                  }
            else  /* last one */
                  {
                  HMAC_Final(&ctx,A1,&A1_len);
                  memcpy(out,A1,olen);
                  break;
                  }
            }
      HMAC_CTX_cleanup(&ctx);
      HMAC_CTX_cleanup(&ctx_tmp);
      OPENSSL_cleanse(A1,sizeof(A1));
      }

static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
                 unsigned char *label, int label_len,
                 const unsigned char *sec, int slen, unsigned char *out1,
                 unsigned char *out2, int olen)
      {
      int len,i;
      const unsigned char *S1,*S2;

      len=slen/2;
      S1=sec;
      S2= &(sec[len]);
      len+=(slen&1); /* add for odd, make longer */

#ifdef OPENSSL_FIPS
      FIPS_allow_md5(1);
#endif
      tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
#ifdef OPENSSL_FIPS
      FIPS_allow_md5(0);
#endif
      tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);

      for (i=0; i<olen; i++)
            out1[i]^=out2[i];
      }

static void tls1_generate_key_block(SSL *s, unsigned char *km,
           unsigned char *tmp, int num)
      {
      unsigned char *p;
      unsigned char buf[SSL3_RANDOM_SIZE*2+
            TLS_MD_MAX_CONST_SIZE];
      p=buf;

      memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
            TLS_MD_KEY_EXPANSION_CONST_SIZE);
      p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
      memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
      p+=SSL3_RANDOM_SIZE;
      memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
      p+=SSL3_RANDOM_SIZE;

      tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
             s->session->master_key,s->session->master_key_length,
             km,tmp,num);
#ifdef KSSL_DEBUG
      printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
                s->session->master_key_length);
      {
        int i;
        for (i=0; i < s->session->master_key_length; i++)
                {
                printf("%02X", s->session->master_key[i]);
                }
        printf("\n");  }
#endif    /* KSSL_DEBUG */
      }

int tls1_change_cipher_state(SSL *s, int which)
      {
      static const unsigned char empty[]="";
      unsigned char *p,*key_block,*mac_secret;
      unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
            SSL3_RANDOM_SIZE*2];
      unsigned char tmp1[EVP_MAX_KEY_LENGTH];
      unsigned char tmp2[EVP_MAX_KEY_LENGTH];
      unsigned char iv1[EVP_MAX_IV_LENGTH*2];
      unsigned char iv2[EVP_MAX_IV_LENGTH*2];
      unsigned char *ms,*key,*iv,*er1,*er2;
      int client_write;
      EVP_CIPHER_CTX *dd;
      const EVP_CIPHER *c;
      const SSL_COMP *comp;
      const EVP_MD *m;
      int is_export,n,i,j,k,exp_label_len,cl;
      int reuse_dd = 0;

      is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
      c=s->s3->tmp.new_sym_enc;
      m=s->s3->tmp.new_hash;
      comp=s->s3->tmp.new_compression;
      key_block=s->s3->tmp.key_block;

#ifdef KSSL_DEBUG
      printf("tls1_change_cipher_state(which= %d) w/\n", which);
      printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
                comp);
      printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
      printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
                c->nid,c->block_size,c->key_len,c->iv_len);
      printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
      {
        int i;
        for (i=0; i<s->s3->tmp.key_block_length; i++)
            printf("%02x", key_block[i]);  printf("\n");
        }
#endif      /* KSSL_DEBUG */

      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;
            dd= s->enc_read_ctx;
            s->read_hash=m;
            if (s->expand != NULL)
                  {
                  COMP_CTX_free(s->expand);
                  s->expand=NULL;
                  }
            if (comp != NULL)
                  {
                  s->expand=COMP_CTX_new(comp->method);
                  if (s->expand == NULL)
                        {
                        SSLerr(SSL_F_TLS1_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_ENCRYPTED_LENGTH);
                  if (s->s3->rrec.comp == NULL)
                        goto err;
                  }
            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;
            if ((s->enc_write_ctx == NULL) &&
                  ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
                  OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
                  goto err;
            dd= s->enc_write_ctx;
            s->write_hash=m;
            if (s->compress != NULL)
                  {
                  COMP_CTX_free(s->compress);
                  s->compress=NULL;
                  }
            if (comp != NULL)
                  {
                  s->compress=COMP_CTX_new(comp->method);
                  if (s->compress == NULL)
                        {
                        SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
                        goto err2;
                        }
                  }
            memset(&(s->s3->write_sequence[0]),0,8);
            mac_secret= &(s->s3->write_mac_secret[0]);
            }

      if (reuse_dd)
            EVP_CIPHER_CTX_cleanup(dd);
      EVP_CIPHER_CTX_init(dd);

      p=s->s3->tmp.key_block;
      i=EVP_MD_size(m);
      cl=EVP_CIPHER_key_length(c);
      j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
                     cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
      /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
      k=EVP_CIPHER_iv_length(c);
      er1= &(s->s3->client_random[0]);
      er2= &(s->s3->server_random[0]);
      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;
            exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
            exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
            client_write=1;
            }
      else
            {
            n=i;
            ms=  &(p[ n]); n+=i+j;
            key= &(p[ n]); n+=j+k;
            iv=  &(p[ n]); n+=k;
            exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
            exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
            client_write=0;
            }

      if (n > s->s3->tmp.key_block_length)
            {
            SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
            goto err2;
            }

      memcpy(mac_secret,ms,i);
#ifdef TLS_DEBUG
printf("which = %04X\nmac key=",which);
{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
#endif
      if (is_export)
            {
            /* In here I set both the read and write key/iv to the
             * same value since only the correct one will be used :-).
             */
            p=buf;
            memcpy(p,exp_label,exp_label_len);
            p+=exp_label_len;
            memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
            p+=SSL3_RANDOM_SIZE;
            memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
            p+=SSL3_RANDOM_SIZE;
            tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
                   tmp1,tmp2,EVP_CIPHER_key_length(c));
            key=tmp1;

            if (k > 0)
                  {
                  p=buf;
                  memcpy(p,TLS_MD_IV_BLOCK_CONST,
                        TLS_MD_IV_BLOCK_CONST_SIZE);
                  p+=TLS_MD_IV_BLOCK_CONST_SIZE;
                  memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
                  p+=SSL3_RANDOM_SIZE;
                  memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
                  p+=SSL3_RANDOM_SIZE;
                  tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
                         iv1,iv2,k*2);
                  if (client_write)
                        iv=iv1;
                  else
                        iv= &(iv1[k]);
                  }
            }

      s->session->key_arg_length=0;
#ifdef KSSL_DEBUG
      {
        int i;
      printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
      printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
      printf("\n");
      printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
      printf("\n");
      }
#endif      /* KSSL_DEBUG */

      EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
#ifdef TLS_DEBUG
printf("which = %04X\nkey=",which);
{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
printf("\niv=");
{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
printf("\n");
#endif

      OPENSSL_cleanse(tmp1,sizeof(tmp1));
      OPENSSL_cleanse(tmp2,sizeof(tmp1));
      OPENSSL_cleanse(iv1,sizeof(iv1));
      OPENSSL_cleanse(iv2,sizeof(iv2));
      return(1);
err:
      SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
err2:
      return(0);
      }

int tls1_setup_key_block(SSL *s)
      {
      unsigned char *p1,*p2;
      const EVP_CIPHER *c;
      const EVP_MD *hash;
      int num;
      SSL_COMP *comp;

#ifdef KSSL_DEBUG
      printf ("tls1_setup_key_block()\n");
#endif      /* KSSL_DEBUG */

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

      if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
            {
            SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
            return(0);
            }

      s->s3->tmp.new_sym_enc=c;
      s->s3->tmp.new_hash=hash;

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

      ssl3_cleanup_key_block(s);

      if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
            goto err;
      if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
            goto err;

      s->s3->tmp.key_block_length=num;
      s->s3->tmp.key_block=p1;


#ifdef TLS_DEBUG
printf("client random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
printf("server random\n");
{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
printf("pre-master\n");
{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
#endif
      tls1_generate_key_block(s,p1,p2,num);
      OPENSSL_cleanse(p2,num);
      OPENSSL_free(p2);
#ifdef TLS_DEBUG
printf("\nkey block\n");
{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
#endif

      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(1);
err:
      SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
      return(0);
      }

int tls1_enc(SSL *s, int send)
      {
      SSL3_RECORD *rec;
      EVP_CIPHER_CTX *ds;
      unsigned long l;
      int bs,i,ii,j,k,n=0;
      const EVP_CIPHER *enc;

      if (send)
            {
            if (s->write_hash != NULL)
                  n=EVP_MD_size(s->write_hash);
            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
            {
            if (s->read_hash != NULL)
                  n=EVP_MD_size(s->read_hash);
            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);
            }

#ifdef KSSL_DEBUG
      printf("tls1_enc(%d)\n", send);
#endif    /* KSSL_DEBUG */

      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);

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

                  /* Add weird padding of upto 256 bytes */

                  /* we need to add 'i' padding bytes of value j */
                  j=i-1;
                  if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
                        {
                        if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
                              j++;
                        }
                  for (k=(int)l; k<(int)(l+i); k++)
                        rec->input[k]=j;
                  l+=i;
                  rec->length+=i;
                  }

#ifdef KSSL_DEBUG
            {
                unsigned long ui;
            printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
                        ds,rec->data,rec->input,l);
            printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
                        ds->buf_len, ds->cipher->key_len,
                        DES_KEY_SZ, DES_SCHEDULE_SZ,
                        ds->cipher->iv_len);
            printf("\t\tIV: ");
            for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
            printf("\n");
            printf("\trec->input=");
            for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
            printf("\n");
            }
#endif      /* KSSL_DEBUG */

            if (!send)
                  {
                  if (l == 0 || l%bs != 0)
                        {
                        SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
                        return 0;
                        }
                  }
            
            EVP_Cipher(ds,rec->data,rec->input,l);

#ifdef KSSL_DEBUG
            {
                unsigned long i;
                printf("\trec->data=");
            for (i=0; i<l; i++)
                        printf(" %02x", rec->data[i]);  printf("\n");
                }
#endif      /* KSSL_DEBUG */

            if ((bs != 1) && !send)
                  {
                  ii=i=rec->data[l-1]; /* padding_length */
                  i++;
                  if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
                        {
                        /* First packet is even in size, so check */
                        if ((memcmp(s->s3->read_sequence,
                              "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
                              s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
                        if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
                              i--;
                        }
                  /* TLS 1.0 does not bound the number of padding bytes by the block size.
                   * All of them must have value 'padding_length'. */
                  if (i > (int)rec->length)
                        {
                        /* 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;
                        }
                  for (j=(int)(l-i); j<(int)l; j++)
                        {
                        if (rec->data[j] != ii)
                              {
                              /* Incorrect padding */
                              return -1;
                              }
                        }
                  rec->length-=i;
                  }
            }
      return(1);
      }

int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
      {
      unsigned int ret;
      EVP_MD_CTX ctx;

      EVP_MD_CTX_init(&ctx);
      EVP_MD_CTX_copy_ex(&ctx,in_ctx);
#ifdef OPENSSL_FIPS
      FIPS_allow_md5(1);
#endif
      EVP_DigestFinal_ex(&ctx,out,&ret);
#ifdef OPENSSL_FIPS
      FIPS_allow_md5(0);
#endif
      EVP_MD_CTX_cleanup(&ctx);
      return((int)ret);
      }

int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
           const char *str, int slen, unsigned char *out)
      {
      unsigned int i;
      EVP_MD_CTX ctx;
      unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
      unsigned char *q,buf2[12];

      q=buf;
      memcpy(q,str,slen);
      q+=slen;

      EVP_MD_CTX_init(&ctx);
      EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
#ifdef OPENSSL_FIPS
      FIPS_allow_md5(1);
#endif
      EVP_DigestFinal_ex(&ctx,q,&i);
#ifdef OPENSSL_FIPS
      FIPS_allow_md5(0);
#endif
      q+=i;
      EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
      EVP_DigestFinal_ex(&ctx,q,&i);
      q+=i;

      tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
            s->session->master_key,s->session->master_key_length,
            out,buf2,sizeof buf2);
      EVP_MD_CTX_cleanup(&ctx);

      return sizeof buf2;
      }

int tls1_mac(SSL *ssl, unsigned char *md, int send)
      {
      SSL3_RECORD *rec;
      unsigned char *mac_sec,*seq;
      const EVP_MD *hash;
      unsigned int md_size;
      int i;
      HMAC_CTX hmac;
      unsigned char buf[5]; 

      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);

      buf[0]=rec->type;
      buf[1]=TLS1_VERSION_MAJOR;
      buf[2]=TLS1_VERSION_MINOR;
      buf[3]=rec->length>>8;
      buf[4]=rec->length&0xff;

      /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
      HMAC_CTX_init(&hmac);
      HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
      HMAC_Update(&hmac,seq,8);
      HMAC_Update(&hmac,buf,5);
      HMAC_Update(&hmac,rec->input,rec->length);
      HMAC_Final(&hmac,md,&md_size);
      HMAC_CTX_cleanup(&hmac);

#ifdef TLS_DEBUG
printf("sec=");
{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
printf("seq=");
{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
printf("buf=");
{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
printf("rec=");
{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
#endif

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

#ifdef TLS_DEBUG
{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
#endif
      return(md_size);
      }

int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
           int len)
      {
      unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
      unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];

#ifdef KSSL_DEBUG
      printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
#endif      /* KSSL_DEBUG */

      /* Setup the stuff to munge */
      memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
            TLS_MD_MASTER_SECRET_CONST_SIZE);
      memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
            s->s3->client_random,SSL3_RANDOM_SIZE);
      memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
            s->s3->server_random,SSL3_RANDOM_SIZE);
      tls1_PRF(s->ctx->md5,s->ctx->sha1,
            buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
            s->session->master_key,buff,sizeof buff);
#ifdef KSSL_DEBUG
      printf ("tls1_generate_master_secret() complete\n");
#endif      /* KSSL_DEBUG */
      return(SSL3_MASTER_SECRET_SIZE);
      }

int tls1_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(TLS1_AD_DECRYPTION_FAILED);
      case SSL_AD_RECORD_OVERFLOW:  return(TLS1_AD_RECORD_OVERFLOW);
      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(-1);
      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(TLS1_AD_UNKNOWN_CA);
      case SSL_AD_ACCESS_DENIED:    return(TLS1_AD_ACCESS_DENIED);
      case SSL_AD_DECODE_ERROR:     return(TLS1_AD_DECODE_ERROR);
      case SSL_AD_DECRYPT_ERROR:    return(TLS1_AD_DECRYPT_ERROR);
      case SSL_AD_EXPORT_RESTRICTION:     return(TLS1_AD_EXPORT_RESTRICTION);
      case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION);
      case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
      case SSL_AD_INTERNAL_ERROR:   return(TLS1_AD_INTERNAL_ERROR);
      case SSL_AD_USER_CANCELLED:   return(TLS1_AD_USER_CANCELLED);
      case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION);
      default:                return(-1);
            }
      }


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