ssl/s3_enc.c

   1 /* ssl/s3_enc.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/evp.h>
  61 #include "ssl_locl.h"
  62
  63 static unsigned char ssl3_pad_1[48]={
  64         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  65         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  66         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  67         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  68         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  69         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
  70
  71 static unsigned char ssl3_pad_2[48]={
  72         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  73         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  74         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  75         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  76         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  77         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
  78
  79 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
  80         const char *sender, int len, unsigned char *p);
  81
  82 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
  83         {
  84         EVP_MD_CTX m5;
  85         EVP_MD_CTX s1;
  86         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
  87         unsigned char c='A';
  88         int i,j,k;
  89
  90 #ifdef CHARSET_EBCDIC
  91         c = os_toascii[c]; /*'A' in ASCII */
  92 #endif
  93         k=0;
  94         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  95                 {
  96                 k++;
  97                 if (k > sizeof buf)
  98                         {
  99                         /* bug: 'buf' is too small for this ciphersuite */
 100                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 101                         return 0;
 102                         }
 103
 104                 for (j=0; j<k; j++)
 105                         buf[j]=c;
 106                 c++;
 107                 EVP_DigestInit(&s1,EVP_sha1());
 108                 EVP_DigestUpdate(&s1,buf,k);
 109                 EVP_DigestUpdate(&s1,s->session->master_key,
 110                         s->session->master_key_length);
 111                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 112                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 113                 EVP_DigestFinal(&s1,smd,NULL);
 114
 115                 EVP_DigestInit(&m5,EVP_md5());
 116                 EVP_DigestUpdate(&m5,s->session->master_key,
 117                         s->session->master_key_length);
 118                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 119                 if ((i+MD5_DIGEST_LENGTH) > num)
 120                         {
 121                         EVP_DigestFinal(&m5,smd,NULL);
 122                         memcpy(km,smd,(num-i));
 123                         }
 124                 else
 125                         EVP_DigestFinal(&m5,km,NULL);
 126
 127                 km+=MD5_DIGEST_LENGTH;
 128                 }
 129         memset(smd,0,SHA_DIGEST_LENGTH);
 130         return 1;
 131         }
 132
 133 int ssl3_change_cipher_state(SSL *s, int which)
 134         {
 135         unsigned char *p,*key_block,*mac_secret;
 136         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 137         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 138         unsigned char *ms,*key,*iv,*er1,*er2;
 139         EVP_CIPHER_CTX *dd;
 140         const EVP_CIPHER *c;
 141         COMP_METHOD *comp;
 142         const EVP_MD *m;
 143         EVP_MD_CTX md;
 144         int exp,n,i,j,k,cl;
 145
 146         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 147         c=s->s3->tmp.new_sym_enc;
 148         m=s->s3->tmp.new_hash;
 149         if (s->s3->tmp.new_compression == NULL)
 150                 comp=NULL;
 151         else
 152                 comp=s->s3->tmp.new_compression->method;
 153         key_block=s->s3->tmp.key_block;
 154
 155         if (which & SSL3_CC_READ)
 156                 {
 157                 if ((s->enc_read_ctx == NULL) &&
 158                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 159                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 160                         goto err;
 161                 dd= s->enc_read_ctx;
 162                 s->read_hash=m;
 163                 /* COMPRESS */
 164                 if (s->expand != NULL)
 165                         {
 166                         COMP_CTX_free(s->expand);
 167                         s->expand=NULL;
 168                         }
 169                 if (comp != NULL)
 170                         {
 171                         s->expand=COMP_CTX_new(comp);
 172                         if (s->expand == NULL)
 173                                 {
 174                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 175                                 goto err2;
 176                                 }
 177                         if (s->s3->rrec.comp == NULL)
 178                                 s->s3->rrec.comp=(unsigned char *)
 179                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 180                         if (s->s3->rrec.comp == NULL)
 181                                 goto err;
 182                         }
 183                 memset(&(s->s3->read_sequence[0]),0,8);
 184                 mac_secret= &(s->s3->read_mac_secret[0]);
 185                 }
 186         else
 187                 {
 188                 if ((s->enc_write_ctx == NULL) &&
 189                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 190                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 191                         goto err;
 192                 dd= s->enc_write_ctx;
 193                 s->write_hash=m;
 194                 /* COMPRESS */
 195                 if (s->compress != NULL)
 196                         {
 197                         COMP_CTX_free(s->compress);
 198                         s->compress=NULL;
 199                         }
 200                 if (comp != NULL)
 201                         {
 202                         s->compress=COMP_CTX_new(comp);
 203                         if (s->compress == NULL)
 204                                 {
 205                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 206                                 goto err2;
 207                                 }
 208                         }
 209                 memset(&(s->s3->write_sequence[0]),0,8);
 210                 mac_secret= &(s->s3->write_mac_secret[0]);
 211                 }
 212
 213         EVP_CIPHER_CTX_init(dd);
 214
 215         p=s->s3->tmp.key_block;
 216         i=EVP_MD_size(m);
 217         cl=EVP_CIPHER_key_length(c);
 218         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 219                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 220         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 221         k=EVP_CIPHER_iv_length(c);
 222         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 223                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 224                 {
 225                 ms=  &(p[ 0]); n=i+i;
 226                 key= &(p[ n]); n+=j+j;
 227                 iv=  &(p[ n]); n+=k+k;
 228                 er1= &(s->s3->client_random[0]);
 229                 er2= &(s->s3->server_random[0]);
 230                 }
 231         else
 232                 {
 233                 n=i;
 234                 ms=  &(p[ n]); n+=i+j;
 235                 key= &(p[ n]); n+=j+k;
 236                 iv=  &(p[ n]); n+=k;
 237                 er1= &(s->s3->server_random[0]);
 238                 er2= &(s->s3->client_random[0]);
 239                 }
 240
 241         if (n > s->s3->tmp.key_block_length)
 242                 {
 243                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 244                 goto err2;
 245                 }
 246
 247         memcpy(mac_secret,ms,i);
 248         if (exp)
 249                 {
 250                 /* In here I set both the read and write key/iv to the
 251                  * same value since only the correct one will be used :-).
 252                  */
 253                 EVP_DigestInit(&md,EVP_md5());
 254                 EVP_DigestUpdate(&md,key,j);
 255                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 256                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 257                 EVP_DigestFinal(&md,&(exp_key[0]),NULL);
 258                 key= &(exp_key[0]);
 259
 260                 if (k > 0)
 261                         {
 262                         EVP_DigestInit(&md,EVP_md5());
 263                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 264                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 265                         EVP_DigestFinal(&md,&(exp_iv[0]),NULL);
 266                         iv= &(exp_iv[0]);
 267                         }
 268                 }
 269
 270         s->session->key_arg_length=0;
 271
 272         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 273
 274         memset(&(exp_key[0]),0,sizeof(exp_key));
 275         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 276         return(1);
 277 err:
 278         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 279 err2:
 280         return(0);
 281         }
 282
 283 int ssl3_setup_key_block(SSL *s)
 284         {
 285         unsigned char *p;
 286         const EVP_CIPHER *c;
 287         const EVP_MD *hash;
 288         int num;
 289         SSL_COMP *comp;
 290
 291         if (s->s3->tmp.key_block_length != 0)
 292                 return(1);
 293
 294         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 295                 {
 296                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 297                 return(0);
 298                 }
 299
 300         s->s3->tmp.new_sym_enc=c;
 301         s->s3->tmp.new_hash=hash;
 302         s->s3->tmp.new_compression=comp;
 303
 304         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 305         num*=2;
 306
 307         ssl3_cleanup_key_block(s);
 308
 309         if ((p=OPENSSL_malloc(num)) == NULL)
 310                 goto err;
 311
 312         s->s3->tmp.key_block_length=num;
 313         s->s3->tmp.key_block=p;
 314
 315         return ssl3_generate_key_block(s,p,num);
 316
 317 err:
 318         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 319         return(0);
 320         }
 321
 322 void ssl3_cleanup_key_block(SSL *s)
 323         {
 324         if (s->s3->tmp.key_block != NULL)
 325                 {
 326                 memset(s->s3->tmp.key_block,0,
 327                         s->s3->tmp.key_block_length);
 328                 OPENSSL_free(s->s3->tmp.key_block);
 329                 s->s3->tmp.key_block=NULL;
 330                 }
 331         s->s3->tmp.key_block_length=0;
 332         }
 333
 334 int ssl3_enc(SSL *s, int send)
 335         {
 336         SSL3_RECORD *rec;
 337         EVP_CIPHER_CTX *ds;
 338         unsigned long l;
 339         int bs,i;
 340         const EVP_CIPHER *enc;
 341
 342         if (send)
 343                 {
 344                 ds=s->enc_write_ctx;
 345                 rec= &(s->s3->wrec);
 346                 if (s->enc_write_ctx == NULL)
 347                         enc=NULL;
 348                 else
 349                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 350                 }
 351         else
 352                 {
 353                 ds=s->enc_read_ctx;
 354                 rec= &(s->s3->rrec);
 355                 if (s->enc_read_ctx == NULL)
 356                         enc=NULL;
 357                 else
 358                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 359                 }
 360
 361         if ((s->session == NULL) || (ds == NULL) ||
 362                 (enc == NULL))
 363                 {
 364                 memmove(rec->data,rec->input,rec->length);
 365                 rec->input=rec->data;
 366                 }
 367         else
 368                 {
 369                 l=rec->length;
 370                 bs=EVP_CIPHER_block_size(ds->cipher);
 371
 372                 /* COMPRESS */
 373
 374                 if ((bs != 1) && send)
 375                         {
 376                         i=bs-((int)l%bs);
 377
 378                         /* we need to add 'i-1' padding bytes */
 379                         l+=i;
 380                         rec->length+=i;
 381                         rec->input[l-1]=(i-1);
 382                         }
 383
 384                 if (!send)
 385                         {
 386                         if (l == 0 || l%bs != 0)
 387                                 {
 388                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 389                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 390                                 return(0);
 391                                 }
 392                         }
 393
 394                 EVP_Cipher(ds,rec->data,rec->input,l);
 395
 396                 if ((bs != 1) && !send)
 397                         {
 398                         i=rec->data[l-1]+1;
 399                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 400                          * padding bytes (except that last) are arbitrary */
 401                         if (i > bs)
 402                                 {
 403                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 404                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 405                                 return(0);
 406                                 }
 407                         rec->length-=i;
 408                         }
 409                 }
 410         return(1);
 411         }
 412
 413 void ssl3_init_finished_mac(SSL *s)
 414         {
 415         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 416         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 417         }
 418
 419 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 420         {
 421         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 422         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 423         }
 424
 425 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 426         {
 427         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 428         }
 429
 430 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 431              const char *sender, int len, unsigned char *p)
 432         {
 433         int ret;
 434
 435         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 436         p+=ret;
 437         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 438         return(ret);
 439         }
 440
 441 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 442              const char *sender, int len, unsigned char *p)
 443         {
 444         unsigned int ret;
 445         int npad,n;
 446         unsigned int i;
 447         unsigned char md_buf[EVP_MAX_MD_SIZE];
 448         EVP_MD_CTX ctx;
 449
 450         EVP_MD_CTX_copy(&ctx,in_ctx);
 451
 452         n=EVP_MD_CTX_size(&ctx);
 453         npad=(48/n)*n;
 454
 455         if (sender != NULL)
 456                 EVP_DigestUpdate(&ctx,sender,len);
 457         EVP_DigestUpdate(&ctx,s->session->master_key,
 458                 s->session->master_key_length);
 459         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 460         EVP_DigestFinal(&ctx,md_buf,&i);
 461
 462         EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
 463         EVP_DigestUpdate(&ctx,s->session->master_key,
 464                 s->session->master_key_length);
 465         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 466         EVP_DigestUpdate(&ctx,md_buf,i);
 467         EVP_DigestFinal(&ctx,p,&ret);
 468
 469         memset(&ctx,0,sizeof(EVP_MD_CTX));
 470
 471         return((int)ret);
 472         }
 473
 474 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 475         {
 476         SSL3_RECORD *rec;
 477         unsigned char *mac_sec,*seq;
 478         EVP_MD_CTX md_ctx;
 479         const EVP_MD *hash;
 480         unsigned char *p,rec_char;
 481         unsigned int md_size;
 482         int npad,i;
 483
 484         if (send)
 485                 {
 486                 rec= &(ssl->s3->wrec);
 487                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 488                 seq= &(ssl->s3->write_sequence[0]);
 489                 hash=ssl->write_hash;
 490                 }
 491         else
 492                 {
 493                 rec= &(ssl->s3->rrec);
 494                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 495                 seq= &(ssl->s3->read_sequence[0]);
 496                 hash=ssl->read_hash;
 497                 }
 498
 499         md_size=EVP_MD_size(hash);
 500         npad=(48/md_size)*md_size;
 501
 502         /* Chop the digest off the end :-) */
 503
 504         EVP_DigestInit(  &md_ctx,hash);
 505         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 506         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 507         EVP_DigestUpdate(&md_ctx,seq,8);
 508         rec_char=rec->type;
 509         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 510         p=md;
 511         s2n(rec->length,p);
 512         EVP_DigestUpdate(&md_ctx,md,2);
 513         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 514         EVP_DigestFinal( &md_ctx,md,NULL);
 515
 516         EVP_DigestInit(  &md_ctx,hash);
 517         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 518         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 519         EVP_DigestUpdate(&md_ctx,md,md_size);
 520         EVP_DigestFinal( &md_ctx,md,&md_size);
 521
 522         for (i=7; i>=0; i--)
 523                 {
 524                 ++seq[i];
 525                 if (seq[i] != 0) break;
 526                 }
 527
 528         return(md_size);
 529         }
 530
 531 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 532              int len)
 533         {
 534         static const unsigned char *salt[3]={
 535 #ifndef CHARSET_EBCDIC
 536                 (const unsigned char *)"A",
 537                 (const unsigned char *)"BB",
 538                 (const unsigned char *)"CCC",
 539 #else
 540                 (const unsigned char *)"\x41",
 541                 (const unsigned char *)"\x42\x42",
 542                 (const unsigned char *)"\x43\x43\x43",
 543 #endif
 544                 };
 545         unsigned char buf[EVP_MAX_MD_SIZE];
 546         EVP_MD_CTX ctx;
 547         int i,ret=0;
 548         unsigned int n;
 549
 550         for (i=0; i<3; i++)
 551                 {
 552                 EVP_DigestInit(&ctx,s->ctx->sha1);
 553                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 554                 EVP_DigestUpdate(&ctx,p,len);
 555                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 556                         SSL3_RANDOM_SIZE);
 557                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 558                         SSL3_RANDOM_SIZE);
 559                 EVP_DigestFinal(&ctx,buf,&n);
 560
 561                 EVP_DigestInit(&ctx,s->ctx->md5);
 562                 EVP_DigestUpdate(&ctx,p,len);
 563                 EVP_DigestUpdate(&ctx,buf,n);
 564                 EVP_DigestFinal(&ctx,out,&n);
 565                 out+=n;
 566                 ret+=n;
 567                 }
 568         return(ret);
 569         }
 570
 571 int ssl3_alert_code(int code)
 572         {
 573         switch (code)
 574                 {
 575         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 576         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 577         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 578         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 579         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 580         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 581         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 582         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 583         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 584         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 585         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 586         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 587         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 588         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 589         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 590         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 591         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 592         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 593         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 594         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 595         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 596         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 597         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 598         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 599         default:                        return(-1);
 600                 }
 601         }
 602