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