ssl/t1_enc.c

   1 /* ssl/t1_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 "evp.h"
  61 #include "hmac.h"
  62 #include "ssl_locl.h"
  63
  64 static void tls1_P_hash(md,sec,sec_len,seed,seed_len,out,olen)
  65 EVP_MD *md;
  66 unsigned char *sec;
  67 int sec_len;
  68 unsigned char *seed;
  69 int seed_len;
  70 unsigned char *out;
  71 int olen;
  72         {
  73         int chunk,n;
  74         unsigned int j;
  75         HMAC_CTX ctx;
  76         HMAC_CTX ctx_tmp;
  77         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  78         unsigned int A1_len;
  79
  80         chunk=EVP_MD_size(md);
  81
  82         HMAC_Init(&ctx,sec,sec_len,md);
  83         HMAC_Update(&ctx,seed,seed_len);
  84         HMAC_Final(&ctx,A1,&A1_len);
  85
  86         n=0;
  87         for (;;)
  88                 {
  89                 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
  90                 HMAC_Update(&ctx,A1,A1_len);
  91                 memcpy(&ctx_tmp,&ctx,sizeof(ctx)); /* Copy for A2 */ /* not needed for last one */
  92                 HMAC_Update(&ctx,seed,seed_len);
  93
  94                 if (olen > chunk)
  95                         {
  96                         HMAC_Final(&ctx,out,&j);
  97                         out+=j;
  98                         olen-=j;
  99                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 100                         }
 101                 else    /* last one */
 102                         {
 103                         HMAC_Final(&ctx,A1,&A1_len);
 104                         memcpy(out,A1,olen);
 105                         break;
 106                         }
 107                 }
 108         HMAC_cleanup(&ctx);
 109         HMAC_cleanup(&ctx_tmp);
 110         memset(A1,0,sizeof(A1));
 111         }
 112
 113 static void tls1_PRF(md5,sha1,label,label_len,sec,slen,out1,out2,olen)
 114 EVP_MD *md5;
 115 EVP_MD *sha1;
 116 unsigned char *label;
 117 int label_len;
 118 unsigned char *sec;
 119 int slen;
 120 unsigned char *out1;
 121 unsigned char *out2;
 122 int olen;
 123         {
 124         int len,i;
 125         unsigned char *S1,*S2;
 126
 127         len=slen/2;
 128         S1=sec;
 129         S2= &(sec[len]);
 130         len+=(slen&1); /* add for odd, make longer */
 131
 132
 133         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 134         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 135
 136         for (i=0; i<olen; i++)
 137                 out1[i]^=out2[i];
 138         }
 139
 140 static void tls1_generate_key_block(s,km,tmp,num)
 141 SSL *s;
 142 unsigned char *km,*tmp;
 143 int num;
 144         {
 145         unsigned char *p;
 146         unsigned char buf[SSL3_RANDOM_SIZE*2+
 147                 TLS_MD_MAX_CONST_SIZE];
 148         p=buf;
 149
 150         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 151                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 152         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 153         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 154         p+=SSL3_RANDOM_SIZE;
 155         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 156         p+=SSL3_RANDOM_SIZE;
 157
 158         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 159                 s->session->master_key,s->session->master_key_length,
 160                 km,tmp,num);
 161         }
 162
 163 int tls1_change_cipher_state(s,which)
 164 SSL *s;
 165 int which;
 166         {
 167         unsigned char *p,*key_block,*mac_secret;
 168         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 169                 SSL3_RANDOM_SIZE*2];
 170         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 171         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 172         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 173         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 174         unsigned char *ms,*key,*iv,*er1,*er2;
 175         int client_write;
 176         EVP_CIPHER_CTX *dd;
 177         EVP_CIPHER *c;
 178         COMP_METHOD *comp;
 179         EVP_MD *m;
 180         int exp,n,i,j,k,exp_label_len,cl;
 181
 182         exp=(s->s3->tmp.new_cipher->algorithms & SSL_EXPORT)?1:0;
 183         c=s->s3->tmp.new_sym_enc;
 184         m=s->s3->tmp.new_hash;
 185         comp=s->s3->tmp.new_compression;
 186         key_block=s->s3->tmp.key_block;
 187
 188         if (which & SSL3_CC_READ)
 189                 {
 190                 if ((s->enc_read_ctx == NULL) &&
 191                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 192                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 193                         goto err;
 194                 dd= s->enc_read_ctx;
 195                 s->read_hash=m;
 196                 if (s->expand != NULL)
 197                         {
 198                         COMP_CTX_free(s->expand);
 199                         s->expand=NULL;
 200                         }
 201                 if (comp != NULL)
 202                         {
 203                         s->expand=COMP_CTX_new(comp);
 204                         if (s->expand == NULL)
 205                                 {
 206                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 207                                 goto err2;
 208                                 }
 209                         s->s3->rrec.comp=(unsigned char *)
 210                                 Malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 211                         if (s->s3->rrec.comp == NULL)
 212                                 goto err;
 213                         }
 214                 memset(&(s->s3->read_sequence[0]),0,8);
 215                 mac_secret= &(s->s3->read_mac_secret[0]);
 216                 }
 217         else
 218                 {
 219                 if ((s->enc_write_ctx == NULL) &&
 220                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 221                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 222                         goto err;
 223                 dd= s->enc_write_ctx;
 224                 s->write_hash=m;
 225                 if (s->compress != NULL)
 226                         {
 227                         COMP_CTX_free(s->compress);
 228                         s->compress=NULL;
 229                         }
 230                 if (comp != NULL)
 231                         {
 232                         s->compress=COMP_CTX_new(comp);
 233                         if (s->compress == NULL)
 234                                 {
 235                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 236                                 goto err2;
 237                                 }
 238                         }
 239                 memset(&(s->s3->write_sequence[0]),0,8);
 240                 mac_secret= &(s->s3->write_mac_secret[0]);
 241                 }
 242
 243         EVP_CIPHER_CTX_init(dd);
 244
 245         p=s->s3->tmp.key_block;
 246         i=EVP_MD_size(m);
 247         cl=EVP_CIPHER_key_length(c);
 248         j=exp ? (cl < 5 ? cl : 5) : cl;
 249         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 250         k=EVP_CIPHER_iv_length(c);
 251         er1= &(s->s3->client_random[0]);
 252         er2= &(s->s3->server_random[0]);
 253         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 254                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 255                 {
 256                 ms=  &(p[ 0]); n=i+i;
 257                 key= &(p[ n]); n+=j+j;
 258                 iv=  &(p[ n]); n+=k+k;
 259                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 260                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 261                 client_write=1;
 262                 }
 263         else
 264                 {
 265                 n=i;
 266                 ms=  &(p[ n]); n+=i+j;
 267                 key= &(p[ n]); n+=j+k;
 268                 iv=  &(p[ n]); n+=k;
 269                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 270                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 271                 client_write=0;
 272                 }
 273
 274         if (n > s->s3->tmp.key_block_length)
 275                 {
 276                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 277                 goto err2;
 278                 }
 279
 280         memcpy(mac_secret,ms,i);
 281 #ifdef TLS_DEBUG
 282 printf("which = %04X\nmac key=",which);
 283 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 284 #endif
 285         if (exp)
 286                 {
 287                 /* In here I set both the read and write key/iv to the
 288                  * same value since only the correct one will be used :-).
 289                  */
 290                 p=buf;
 291                 memcpy(p,exp_label,exp_label_len);
 292                 p+=exp_label_len;
 293                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 294                 p+=SSL3_RANDOM_SIZE;
 295                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 296                 p+=SSL3_RANDOM_SIZE;
 297                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 298                         tmp1,tmp2,EVP_CIPHER_key_length(c));
 299                 key=tmp1;
 300
 301                 if (k > 0)
 302                         {
 303                         p=buf;
 304                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 305                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 306                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 307                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 308                         p+=SSL3_RANDOM_SIZE;
 309                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 310                         p+=SSL3_RANDOM_SIZE;
 311                         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 312                                 buf,(int)(p-buf),"",0,iv1,iv2,k*2);
 313                         if (client_write)
 314                                 iv=iv1;
 315                         else
 316                                 iv= &(iv1[k]);
 317                         }
 318                 }
 319
 320         s->session->key_arg_length=0;
 321
 322         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 323 #ifdef TLS_DEBUG
 324 printf("which = %04X\nkey=",which);
 325 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 326 printf("\niv=");
 327 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 328 printf("\n");
 329 #endif
 330
 331         memset(tmp1,0,sizeof(tmp1));
 332         memset(tmp2,0,sizeof(tmp1));
 333         memset(iv1,0,sizeof(iv1));
 334         memset(iv2,0,sizeof(iv2));
 335         return(1);
 336 err:
 337         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 338 err2:
 339         return(0);
 340         }
 341
 342 int tls1_setup_key_block(s)
 343 SSL *s;
 344         {
 345         unsigned char *p1,*p2;
 346         EVP_CIPHER *c;
 347         EVP_MD *hash;
 348         int num,exp;
 349
 350         if (s->s3->tmp.key_block_length != 0)
 351                 return(1);
 352
 353         if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
 354                 {
 355                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 356                 return(0);
 357                 }
 358
 359         s->s3->tmp.new_sym_enc=c;
 360         s->s3->tmp.new_hash=hash;
 361
 362         exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
 363
 364         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 365         num*=2;
 366
 367         ssl3_cleanup_key_block(s);
 368
 369         if ((p1=(unsigned char *)Malloc(num)) == NULL)
 370                 goto err;
 371         if ((p2=(unsigned char *)Malloc(num)) == NULL)
 372                 goto err;
 373
 374         s->s3->tmp.key_block_length=num;
 375         s->s3->tmp.key_block=p1;
 376
 377
 378 #ifdef TLS_DEBUG
 379 printf("client random\n");
 380 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 381 printf("server random\n");
 382 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 383 printf("pre-master\n");
 384 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 385 #endif
 386         tls1_generate_key_block(s,p1,p2,num);
 387         memset(p2,0,num);
 388         Free(p2);
 389 #ifdef TLS_DEBUG
 390 printf("\nkey block\n");
 391 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 392 #endif
 393
 394         return(1);
 395 err:
 396         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 397         return(0);
 398         }
 399
 400 int tls1_enc(s,send)
 401 SSL *s;
 402 int send;
 403         {
 404         SSL3_RECORD *rec;
 405         EVP_CIPHER_CTX *ds;
 406         unsigned long l;
 407         int bs,i,ii,j,k,n=0;
 408         EVP_CIPHER *enc;
 409
 410         if (send)
 411                 {
 412                 if (s->write_hash != NULL)
 413                         n=EVP_MD_size(s->write_hash);
 414                 ds=s->enc_write_ctx;
 415                 rec= &(s->s3->wrec);
 416                 if (s->enc_write_ctx == NULL)
 417                         enc=NULL;
 418                 else
 419                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 420                 }
 421         else
 422                 {
 423                 if (s->read_hash != NULL)
 424                         n=EVP_MD_size(s->read_hash);
 425                 ds=s->enc_read_ctx;
 426                 rec= &(s->s3->rrec);
 427                 if (s->enc_read_ctx == NULL)
 428                         enc=NULL;
 429                 else
 430                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 431                 }
 432
 433         if ((s->session == NULL) || (ds == NULL) ||
 434                 (enc == NULL))
 435                 {
 436                 memcpy(rec->data,rec->input,rec->length);
 437                 rec->input=rec->data;
 438                 }
 439         else
 440                 {
 441                 l=rec->length;
 442                 bs=EVP_CIPHER_block_size(ds->cipher);
 443
 444                 if ((bs != 1) && send)
 445                         {
 446                         i=bs-((int)l%bs);
 447
 448                         /* Add weird padding of upto 256 bytes */
 449
 450                         /* we need to add 'i' padding bytes of value j */
 451                         j=i-1;
 452                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 453                                 {
 454                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 455                                         j++;
 456                                 }
 457                         for (k=(int)l; k<(int)(l+i); k++)
 458                                 rec->input[k]=j;
 459                         l+=i;
 460                         rec->length+=i;
 461                         }
 462
 463                 EVP_Cipher(ds,rec->data,rec->input,l);
 464
 465                 if ((bs != 1) && !send)
 466                         {
 467                         ii=i=rec->data[l-1];
 468                         i++;
 469                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 470                                 {
 471                                 /* First packet is even in size, so check */
 472                                 if ((memcmp(s->s3->read_sequence,
 473                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 474                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 475                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 476                                         i--;
 477                                 }
 478                         if (i > (int)rec->length)
 479                                 {
 480                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 481                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 482                                 return(0);
 483                                 }
 484                         for (j=(int)(l-i); j<(int)l; j++)
 485                                 {
 486                                 if (rec->data[j] != ii)
 487                                         {
 488                                         SSLerr(SSL_F_TLS1_ENC,SSL_R_DECRYPTION_FAILED);
 489                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 490                                         return(0);
 491                                         }
 492                                 }
 493                         rec->length-=i;
 494                         }
 495                 }
 496         return(1);
 497         }
 498
 499 int tls1_cert_verify_mac(s,in_ctx,out)
 500 SSL *s;
 501 EVP_MD_CTX *in_ctx;
 502 unsigned char *out;
 503         {
 504         unsigned int ret;
 505         EVP_MD_CTX ctx;
 506
 507         memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));
 508         EVP_DigestFinal(&ctx,out,&ret);
 509         return((int)ret);
 510         }
 511
 512 int tls1_final_finish_mac(s,in1_ctx,in2_ctx,str,slen,out)
 513 SSL *s;
 514 EVP_MD_CTX *in1_ctx,*in2_ctx;
 515 unsigned char *str;
 516 int slen;
 517 unsigned char *out;
 518         {
 519         unsigned int i;
 520         EVP_MD_CTX ctx;
 521         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 522         unsigned char *q,buf2[12];
 523
 524         q=buf;
 525         memcpy(q,str,slen);
 526         q+=slen;
 527
 528         memcpy(&ctx,in1_ctx,sizeof(EVP_MD_CTX));
 529         EVP_DigestFinal(&ctx,q,&i);
 530         q+=i;
 531         memcpy(&ctx,in2_ctx,sizeof(EVP_MD_CTX));
 532         EVP_DigestFinal(&ctx,q,&i);
 533         q+=i;
 534
 535         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 536                 s->session->master_key,s->session->master_key_length,
 537                 out,buf2,12);
 538         memset(&ctx,0,sizeof(EVP_MD_CTX));
 539
 540         return((int)12);
 541         }
 542
 543 int tls1_mac(ssl,md,send)
 544 SSL *ssl;
 545 unsigned char *md;
 546 int send;
 547         {
 548         SSL3_RECORD *rec;
 549         unsigned char *mac_sec,*seq;
 550         EVP_MD *hash;
 551         unsigned int md_size;
 552         int i;
 553         HMAC_CTX hmac;
 554         unsigned char buf[5];
 555
 556         if (send)
 557                 {
 558                 rec= &(ssl->s3->wrec);
 559                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 560                 seq= &(ssl->s3->write_sequence[0]);
 561                 hash=ssl->write_hash;
 562                 }
 563         else
 564                 {
 565                 rec= &(ssl->s3->rrec);
 566                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 567                 seq= &(ssl->s3->read_sequence[0]);
 568                 hash=ssl->read_hash;
 569                 }
 570
 571         md_size=EVP_MD_size(hash);
 572
 573         buf[0]=rec->type;
 574         buf[1]=TLS1_VERSION_MAJOR;
 575         buf[2]=TLS1_VERSION_MINOR;
 576         buf[3]=rec->length>>8;
 577         buf[4]=rec->length&0xff;
 578
 579         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 580         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 581         HMAC_Update(&hmac,seq,8);
 582         HMAC_Update(&hmac,buf,5);
 583         HMAC_Update(&hmac,rec->input,rec->length);
 584         HMAC_Final(&hmac,md,&md_size);
 585
 586 #ifdef TLS_DEBUG
 587 printf("sec=");
 588 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 589 printf("seq=");
 590 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 591 printf("buf=");
 592 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 593 printf("rec=");
 594 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 595 #endif
 596
 597         for (i=7; i>=0; i--)
 598                 if (++seq[i]) break;
 599
 600 #ifdef TLS_DEBUG
 601 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 602 #endif
 603         return(md_size);
 604         }
 605
 606 int tls1_generate_master_secret(s,out,p,len)
 607 SSL *s;
 608 unsigned char *out;
 609 unsigned char *p;
 610 int len;
 611         {
 612         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 613         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 614
 615         /* Setup the stuff to munge */
 616         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 617                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 618         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 619                 s->s3->client_random,SSL3_RANDOM_SIZE);
 620         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 621                 s->s3->server_random,SSL3_RANDOM_SIZE);
 622         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 623                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 624                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 625         return(SSL3_MASTER_SECRET_SIZE);
 626         }
 627
 628 int tls1_alert_code(code)
 629 int code;
 630         {
 631         switch (code)
 632                 {
 633         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 634         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 635         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 636         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 637         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 638         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 639         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 640         case SSL_AD_NO_CERTIFICATE:     return(-1);
 641         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 642         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 643         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 644         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 645         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 646         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 647         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 648         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 649         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 650         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 651         case SSL_AD_EXPORT_RESTRICION:  return(TLS1_AD_EXPORT_RESTRICION);
 652         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 653         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 654         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 655         case SSL_AD_USER_CANCLED:       return(TLS1_AD_USER_CANCLED);
 656         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 657         default:                        return(-1);
 658                 }
 659         }
 660