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