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 #include <openssl/md5.h>
  63
  64 static unsigned char ssl3_pad_1[48]={
  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         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
  71
  72 static unsigned char ssl3_pad_2[48]={
  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         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
  79
  80 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
  81         const char *sender, int len, unsigned char *p);
  82
  83 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
  84         {
  85         EVP_MD_CTX m5;
  86         EVP_MD_CTX s1;
  87         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
  88         unsigned char c='A';
  89         int i,j,k;
  90
  91 #ifdef CHARSET_EBCDIC
  92         c = os_toascii[c]; /*'A' in ASCII */
  93 #endif
  94         k=0;
  95         EVP_MD_CTX_init(&m5);
  96         EVP_MD_CTX_init(&s1);
  97         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  98                 {
  99                 k++;
 100                 if (k > sizeof buf)
 101                         {
 102                         /* bug: 'buf' is too small for this ciphersuite */
 103                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 104                         return 0;
 105                         }
 106
 107                 for (j=0; j<k; j++)
 108                         buf[j]=c;
 109                 c++;
 110                 EVP_DigestInit(&s1,EVP_sha1());
 111                 EVP_DigestUpdate(&s1,buf,k);
 112                 EVP_DigestUpdate(&s1,s->session->master_key,
 113                         s->session->master_key_length);
 114                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 115                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 116                 EVP_DigestFinal(&s1,smd,NULL);
 117
 118                 EVP_DigestInit(&m5,EVP_md5());
 119                 EVP_DigestUpdate(&m5,s->session->master_key,
 120                         s->session->master_key_length);
 121                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 122                 if ((i+MD5_DIGEST_LENGTH) > num)
 123                         {
 124                         EVP_DigestFinal(&m5,smd,NULL);
 125                         memcpy(km,smd,(num-i));
 126                         }
 127                 else
 128                         EVP_DigestFinal(&m5,km,NULL);
 129
 130                 km+=MD5_DIGEST_LENGTH;
 131                 }
 132         memset(smd,0,SHA_DIGEST_LENGTH);
 133         EVP_MD_CTX_cleanup(&m5);
 134         EVP_MD_CTX_cleanup(&s1);
 135         return 1;
 136         }
 137
 138 int ssl3_change_cipher_state(SSL *s, int which)
 139         {
 140         unsigned char *p,*key_block,*mac_secret;
 141         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 142         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 143         unsigned char *ms,*key,*iv,*er1,*er2;
 144         EVP_CIPHER_CTX *dd;
 145         const EVP_CIPHER *c;
 146         COMP_METHOD *comp;
 147         const EVP_MD *m;
 148         EVP_MD_CTX md;
 149         int exp,n,i,j,k,cl;
 150
 151         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 152         c=s->s3->tmp.new_sym_enc;
 153         m=s->s3->tmp.new_hash;
 154         if (s->s3->tmp.new_compression == NULL)
 155                 comp=NULL;
 156         else
 157                 comp=s->s3->tmp.new_compression->method;
 158         key_block=s->s3->tmp.key_block;
 159
 160         if (which & SSL3_CC_READ)
 161                 {
 162                 if ((s->enc_read_ctx == NULL) &&
 163                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 164                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 165                         goto err;
 166                 dd= s->enc_read_ctx;
 167                 s->read_hash=m;
 168                 /* COMPRESS */
 169                 if (s->expand != NULL)
 170                         {
 171                         COMP_CTX_free(s->expand);
 172                         s->expand=NULL;
 173                         }
 174                 if (comp != NULL)
 175                         {
 176                         s->expand=COMP_CTX_new(comp);
 177                         if (s->expand == NULL)
 178                                 {
 179                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 180                                 goto err2;
 181                                 }
 182                         if (s->s3->rrec.comp == NULL)
 183                                 s->s3->rrec.comp=(unsigned char *)
 184                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 185                         if (s->s3->rrec.comp == NULL)
 186                                 goto err;
 187                         }
 188                 memset(&(s->s3->read_sequence[0]),0,8);
 189                 mac_secret= &(s->s3->read_mac_secret[0]);
 190                 }
 191         else
 192                 {
 193                 if ((s->enc_write_ctx == NULL) &&
 194                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 195                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 196                         goto err;
 197                 dd= s->enc_write_ctx;
 198                 s->write_hash=m;
 199                 /* COMPRESS */
 200                 if (s->compress != NULL)
 201                         {
 202                         COMP_CTX_free(s->compress);
 203                         s->compress=NULL;
 204                         }
 205                 if (comp != NULL)
 206                         {
 207                         s->compress=COMP_CTX_new(comp);
 208                         if (s->compress == NULL)
 209                                 {
 210                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 211                                 goto err2;
 212                                 }
 213                         }
 214                 memset(&(s->s3->write_sequence[0]),0,8);
 215                 mac_secret= &(s->s3->write_mac_secret[0]);
 216                 }
 217
 218         EVP_CIPHER_CTX_init(dd);
 219
 220         p=s->s3->tmp.key_block;
 221         i=EVP_MD_size(m);
 222         cl=EVP_CIPHER_key_length(c);
 223         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 224                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 225         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 226         k=EVP_CIPHER_iv_length(c);
 227         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 228                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 229                 {
 230                 ms=  &(p[ 0]); n=i+i;
 231                 key= &(p[ n]); n+=j+j;
 232                 iv=  &(p[ n]); n+=k+k;
 233                 er1= &(s->s3->client_random[0]);
 234                 er2= &(s->s3->server_random[0]);
 235                 }
 236         else
 237                 {
 238                 n=i;
 239                 ms=  &(p[ n]); n+=i+j;
 240                 key= &(p[ n]); n+=j+k;
 241                 iv=  &(p[ n]); n+=k;
 242                 er1= &(s->s3->server_random[0]);
 243                 er2= &(s->s3->client_random[0]);
 244                 }
 245
 246         if (n > s->s3->tmp.key_block_length)
 247                 {
 248                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 249                 goto err2;
 250                 }
 251
 252         EVP_MD_CTX_init(&md);
 253         memcpy(mac_secret,ms,i);
 254         if (exp)
 255                 {
 256                 /* In here I set both the read and write key/iv to the
 257                  * same value since only the correct one will be used :-).
 258                  */
 259                 EVP_DigestInit(&md,EVP_md5());
 260                 EVP_DigestUpdate(&md,key,j);
 261                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 262                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 263                 EVP_DigestFinal(&md,&(exp_key[0]),NULL);
 264                 key= &(exp_key[0]);
 265
 266                 if (k > 0)
 267                         {
 268                         EVP_DigestInit(&md,EVP_md5());
 269                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 270                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 271                         EVP_DigestFinal(&md,&(exp_iv[0]),NULL);
 272                         iv= &(exp_iv[0]);
 273                         }
 274                 }
 275
 276         s->session->key_arg_length=0;
 277
 278         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 279
 280         memset(&(exp_key[0]),0,sizeof(exp_key));
 281         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 282         EVP_MD_CTX_cleanup(&md);
 283         return(1);
 284 err:
 285         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 286 err2:
 287         return(0);
 288         }
 289
 290 int ssl3_setup_key_block(SSL *s)
 291         {
 292         unsigned char *p;
 293         const EVP_CIPHER *c;
 294         const EVP_MD *hash;
 295         int num;
 296         SSL_COMP *comp;
 297
 298         if (s->s3->tmp.key_block_length != 0)
 299                 return(1);
 300
 301         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 302                 {
 303                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 304                 return(0);
 305                 }
 306
 307         s->s3->tmp.new_sym_enc=c;
 308         s->s3->tmp.new_hash=hash;
 309         s->s3->tmp.new_compression=comp;
 310
 311         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 312         num*=2;
 313
 314         ssl3_cleanup_key_block(s);
 315
 316         if ((p=OPENSSL_malloc(num)) == NULL)
 317                 goto err;
 318
 319         s->s3->tmp.key_block_length=num;
 320         s->s3->tmp.key_block=p;
 321
 322         return ssl3_generate_key_block(s,p,num);
 323
 324 err:
 325         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 326         return(0);
 327         }
 328
 329 void ssl3_cleanup_key_block(SSL *s)
 330         {
 331         if (s->s3->tmp.key_block != NULL)
 332                 {
 333                 memset(s->s3->tmp.key_block,0,
 334                         s->s3->tmp.key_block_length);
 335                 OPENSSL_free(s->s3->tmp.key_block);
 336                 s->s3->tmp.key_block=NULL;
 337                 }
 338         s->s3->tmp.key_block_length=0;
 339         }
 340
 341 int ssl3_enc(SSL *s, int send)
 342         {
 343         SSL3_RECORD *rec;
 344         EVP_CIPHER_CTX *ds;
 345         unsigned long l;
 346         int bs,i;
 347         const EVP_CIPHER *enc;
 348
 349         if (send)
 350                 {
 351                 ds=s->enc_write_ctx;
 352                 rec= &(s->s3->wrec);
 353                 if (s->enc_write_ctx == NULL)
 354                         enc=NULL;
 355                 else
 356                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 357                 }
 358         else
 359                 {
 360                 ds=s->enc_read_ctx;
 361                 rec= &(s->s3->rrec);
 362                 if (s->enc_read_ctx == NULL)
 363                         enc=NULL;
 364                 else
 365                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 366                 }
 367
 368         if ((s->session == NULL) || (ds == NULL) ||
 369                 (enc == NULL))
 370                 {
 371                 memmove(rec->data,rec->input,rec->length);
 372                 rec->input=rec->data;
 373                 }
 374         else
 375                 {
 376                 l=rec->length;
 377                 bs=EVP_CIPHER_block_size(ds->cipher);
 378
 379                 /* COMPRESS */
 380
 381                 if ((bs != 1) && send)
 382                         {
 383                         i=bs-((int)l%bs);
 384
 385                         /* we need to add 'i-1' padding bytes */
 386                         l+=i;
 387                         rec->length+=i;
 388                         rec->input[l-1]=(i-1);
 389                         }
 390
 391                 if (!send)
 392                         {
 393                         if (l == 0 || l%bs != 0)
 394                                 {
 395                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 396                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 397                                 return(0);
 398                                 }
 399                         }
 400
 401                 EVP_Cipher(ds,rec->data,rec->input,l);
 402
 403                 if ((bs != 1) && !send)
 404                         {
 405                         i=rec->data[l-1]+1;
 406                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 407                          * padding bytes (except that last) are arbitrary */
 408                         if (i > bs)
 409                                 {
 410                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 411                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 412                                 return(0);
 413                                 }
 414                         rec->length-=i;
 415                         }
 416                 }
 417         return(1);
 418         }
 419
 420 void ssl3_init_finished_mac(SSL *s)
 421         {
 422         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 423         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 424         }
 425
 426 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 427         {
 428         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 429         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 430         }
 431
 432 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 433         {
 434         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 435         }
 436
 437 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 438              const char *sender, int len, unsigned char *p)
 439         {
 440         int ret;
 441
 442         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 443         p+=ret;
 444         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 445         return(ret);
 446         }
 447
 448 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 449              const char *sender, int len, unsigned char *p)
 450         {
 451         unsigned int ret;
 452         int npad,n;
 453         unsigned int i;
 454         unsigned char md_buf[EVP_MAX_MD_SIZE];
 455         EVP_MD_CTX ctx;
 456
 457         EVP_MD_CTX_init(&ctx);
 458         EVP_MD_CTX_copy(&ctx,in_ctx);
 459
 460         n=EVP_MD_CTX_size(&ctx);
 461         npad=(48/n)*n;
 462
 463         if (sender != NULL)
 464                 EVP_DigestUpdate(&ctx,sender,len);
 465         EVP_DigestUpdate(&ctx,s->session->master_key,
 466                 s->session->master_key_length);
 467         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 468         EVP_DigestFinal(&ctx,md_buf,&i);
 469
 470         EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
 471         EVP_DigestUpdate(&ctx,s->session->master_key,
 472                 s->session->master_key_length);
 473         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 474         EVP_DigestUpdate(&ctx,md_buf,i);
 475         EVP_DigestFinal(&ctx,p,&ret);
 476
 477         EVP_MD_CTX_cleanup(&ctx);
 478
 479         return((int)ret);
 480         }
 481
 482 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 483         {
 484         SSL3_RECORD *rec;
 485         unsigned char *mac_sec,*seq;
 486         EVP_MD_CTX md_ctx;
 487         const EVP_MD *hash;
 488         unsigned char *p,rec_char;
 489         unsigned int md_size;
 490         int npad,i;
 491
 492         if (send)
 493                 {
 494                 rec= &(ssl->s3->wrec);
 495                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 496                 seq= &(ssl->s3->write_sequence[0]);
 497                 hash=ssl->write_hash;
 498                 }
 499         else
 500                 {
 501                 rec= &(ssl->s3->rrec);
 502                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 503                 seq= &(ssl->s3->read_sequence[0]);
 504                 hash=ssl->read_hash;
 505                 }
 506
 507         md_size=EVP_MD_size(hash);
 508         npad=(48/md_size)*md_size;
 509
 510         /* Chop the digest off the end :-) */
 511         EVP_MD_CTX_init(&md_ctx);
 512
 513         EVP_DigestInit(  &md_ctx,hash);
 514         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 515         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 516         EVP_DigestUpdate(&md_ctx,seq,8);
 517         rec_char=rec->type;
 518         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 519         p=md;
 520         s2n(rec->length,p);
 521         EVP_DigestUpdate(&md_ctx,md,2);
 522         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 523         EVP_DigestFinal( &md_ctx,md,NULL);
 524
 525         EVP_DigestInit(  &md_ctx,hash);
 526         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 527         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 528         EVP_DigestUpdate(&md_ctx,md,md_size);
 529         EVP_DigestFinal( &md_ctx,md,&md_size);
 530
 531         EVP_MD_CTX_cleanup(&md_ctx);
 532
 533         for (i=7; i>=0; i--)
 534                 {
 535                 ++seq[i];
 536                 if (seq[i] != 0) break;
 537                 }
 538
 539         return(md_size);
 540         }
 541
 542 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 543              int len)
 544         {
 545         static const unsigned char *salt[3]={
 546 #ifndef CHARSET_EBCDIC
 547                 (const unsigned char *)"A",
 548                 (const unsigned char *)"BB",
 549                 (const unsigned char *)"CCC",
 550 #else
 551                 (const unsigned char *)"\x41",
 552                 (const unsigned char *)"\x42\x42",
 553                 (const unsigned char *)"\x43\x43\x43",
 554 #endif
 555                 };
 556         unsigned char buf[EVP_MAX_MD_SIZE];
 557         EVP_MD_CTX ctx;
 558         int i,ret=0;
 559         unsigned int n;
 560
 561         EVP_MD_CTX_init(&ctx);
 562         for (i=0; i<3; i++)
 563                 {
 564                 EVP_DigestInit(&ctx,s->ctx->sha1);
 565                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 566                 EVP_DigestUpdate(&ctx,p,len);
 567                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 568                         SSL3_RANDOM_SIZE);
 569                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 570                         SSL3_RANDOM_SIZE);
 571                 EVP_DigestFinal(&ctx,buf,&n);
 572
 573                 EVP_DigestInit(&ctx,s->ctx->md5);
 574                 EVP_DigestUpdate(&ctx,p,len);
 575                 EVP_DigestUpdate(&ctx,buf,n);
 576                 EVP_DigestFinal(&ctx,out,&n);
 577                 out+=n;
 578                 ret+=n;
 579                 }
 580         EVP_MD_CTX_cleanup(&ctx);
 581         return(ret);
 582         }
 583
 584 int ssl3_alert_code(int code)
 585         {
 586         switch (code)
 587                 {
 588         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 589         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 590         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 591         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 592         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 593         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 594         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 595         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 596         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 597         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 598         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 599         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 600         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 601         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 602         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 603         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 604         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 605         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 606         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 607         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 608         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 609         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 610         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 611         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 612         default:                        return(-1);
 613                 }
 614         }
 615