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 <openssl/comp.h>
  61 #include <openssl/evp.h>
  62 #include <openssl/hmac.h>
  63 #include "ssl_locl.h"
  64 #include <openssl/md5.h>
  65
  66 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
  67                         int sec_len, unsigned char *seed, int seed_len,
  68                         unsigned char *out, int olen)
  69         {
  70         int chunk,n;
  71         unsigned int j;
  72         HMAC_CTX ctx;
  73         HMAC_CTX ctx_tmp;
  74         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  75         unsigned int A1_len;
  76
  77         chunk=EVP_MD_size(md);
  78
  79         HMAC_CTX_init(&ctx);
  80         HMAC_CTX_init(&ctx_tmp);
  81         HMAC_Init(&ctx,sec,sec_len,md);
  82         HMAC_Init(&ctx_tmp,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_Init(&ctx_tmp,NULL,0,NULL); /* re-init */
  91                 HMAC_Update(&ctx,A1,A1_len);
  92                 HMAC_Update(&ctx_tmp,A1,A1_len);
  93                 HMAC_Update(&ctx,seed,seed_len);
  94
  95                 if (olen > chunk)
  96                         {
  97                         HMAC_Final(&ctx,out,&j);
  98                         out+=j;
  99                         olen-=j;
 100                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 101                         }
 102                 else    /* last one */
 103                         {
 104                         HMAC_Final(&ctx,A1,&A1_len);
 105                         memcpy(out,A1,olen);
 106                         break;
 107                         }
 108                 }
 109         HMAC_CTX_cleanup(&ctx);
 110         HMAC_CTX_cleanup(&ctx_tmp);
 111         memset(A1,0,sizeof(A1));
 112         }
 113
 114 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 115                      unsigned char *label, int label_len,
 116                      const unsigned char *sec, int slen, unsigned char *out1,
 117                      unsigned char *out2, int olen)
 118         {
 119         int len,i;
 120         const unsigned char *S1,*S2;
 121
 122         len=slen/2;
 123         S1=sec;
 124         S2= &(sec[len]);
 125         len+=(slen&1); /* add for odd, make longer */
 126
 127
 128         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 129         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 130
 131         for (i=0; i<olen; i++)
 132                 out1[i]^=out2[i];
 133         }
 134
 135 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 136              unsigned char *tmp, int num)
 137         {
 138         unsigned char *p;
 139         unsigned char buf[SSL3_RANDOM_SIZE*2+
 140                 TLS_MD_MAX_CONST_SIZE];
 141         p=buf;
 142
 143         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 144                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 145         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 146         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 147         p+=SSL3_RANDOM_SIZE;
 148         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 149         p+=SSL3_RANDOM_SIZE;
 150
 151         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 152                  s->session->master_key,s->session->master_key_length,
 153                  km,tmp,num);
 154 #ifdef KSSL_DEBUG
 155         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 156                 s->session->master_key_length);
 157         {
 158         int i;
 159         for (i=0; i < s->session->master_key_length; i++)
 160                 {
 161                 printf("%02X", s->session->master_key[i]);
 162                 }
 163         printf("\n");  }
 164 #endif    /* KSSL_DEBUG */
 165         }
 166
 167 int tls1_change_cipher_state(SSL *s, int which)
 168         {
 169         static const unsigned char empty[]="";
 170         unsigned char *p,*key_block,*mac_secret;
 171         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 172                 SSL3_RANDOM_SIZE*2];
 173         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 174         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 175         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 176         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 177         unsigned char *ms,*key,*iv,*er1,*er2;
 178         int client_write;
 179         EVP_CIPHER_CTX *dd;
 180         const EVP_CIPHER *c;
 181         const SSL_COMP *comp;
 182         const EVP_MD *m;
 183         int _exp,n,i,j,k,exp_label_len,cl;
 184
 185         _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 186         c=s->s3->tmp.new_sym_enc;
 187         m=s->s3->tmp.new_hash;
 188         comp=s->s3->tmp.new_compression;
 189         key_block=s->s3->tmp.key_block;
 190
 191 #ifdef KSSL_DEBUG
 192         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 193         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 194                 comp);
 195         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 196         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 197                 c->nid,c->block_size,c->key_len,c->iv_len);
 198         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 199         {
 200         int i;
 201         for (i=0; i<s->s3->tmp.key_block_length; i++)
 202                 printf("%02x", key_block[i]);  printf("\n");
 203         }
 204 #endif  /* KSSL_DEBUG */
 205
 206         if (which & SSL3_CC_READ)
 207                 {
 208                 if ((s->enc_read_ctx == NULL) &&
 209                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 210                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 211                         goto err;
 212                 dd= s->enc_read_ctx;
 213                 s->read_hash=m;
 214                 if (s->expand != NULL)
 215                         {
 216                         COMP_CTX_free(s->expand);
 217                         s->expand=NULL;
 218                         }
 219                 if (comp != NULL)
 220                         {
 221                         s->expand=COMP_CTX_new(comp->method);
 222                         if (s->expand == NULL)
 223                                 {
 224                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 225                                 goto err2;
 226                                 }
 227                         if (s->s3->rrec.comp == NULL)
 228                                 s->s3->rrec.comp=(unsigned char *)
 229                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 230                         if (s->s3->rrec.comp == NULL)
 231                                 goto err;
 232                         }
 233                 memset(&(s->s3->read_sequence[0]),0,8);
 234                 mac_secret= &(s->s3->read_mac_secret[0]);
 235                 }
 236         else
 237                 {
 238                 if ((s->enc_write_ctx == NULL) &&
 239                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 240                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 241                         goto err;
 242                 dd= s->enc_write_ctx;
 243                 s->write_hash=m;
 244                 if (s->compress != NULL)
 245                         {
 246                         COMP_CTX_free(s->compress);
 247                         s->compress=NULL;
 248                         }
 249                 if (comp != NULL)
 250                         {
 251                         s->compress=COMP_CTX_new(comp->method);
 252                         if (s->compress == NULL)
 253                                 {
 254                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 255                                 goto err2;
 256                                 }
 257                         }
 258                 memset(&(s->s3->write_sequence[0]),0,8);
 259                 mac_secret= &(s->s3->write_mac_secret[0]);
 260                 }
 261
 262         EVP_CIPHER_CTX_init(dd);
 263
 264         p=s->s3->tmp.key_block;
 265         i=EVP_MD_size(m);
 266         cl=EVP_CIPHER_key_length(c);
 267         j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 268                   cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 269         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 270         k=EVP_CIPHER_iv_length(c);
 271         er1= &(s->s3->client_random[0]);
 272         er2= &(s->s3->server_random[0]);
 273         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 274                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 275                 {
 276                 ms=  &(p[ 0]); n=i+i;
 277                 key= &(p[ n]); n+=j+j;
 278                 iv=  &(p[ n]); n+=k+k;
 279                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 280                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 281                 client_write=1;
 282                 }
 283         else
 284                 {
 285                 n=i;
 286                 ms=  &(p[ n]); n+=i+j;
 287                 key= &(p[ n]); n+=j+k;
 288                 iv=  &(p[ n]); n+=k;
 289                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 290                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 291                 client_write=0;
 292                 }
 293
 294         if (n > s->s3->tmp.key_block_length)
 295                 {
 296                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 297                 goto err2;
 298                 }
 299
 300         memcpy(mac_secret,ms,i);
 301 #ifdef TLS_DEBUG
 302 printf("which = %04X\nmac key=",which);
 303 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 304 #endif
 305         if (_exp)
 306                 {
 307                 /* In here I set both the read and write key/iv to the
 308                  * same value since only the correct one will be used :-).
 309                  */
 310                 p=buf;
 311                 memcpy(p,exp_label,exp_label_len);
 312                 p+=exp_label_len;
 313                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 314                 p+=SSL3_RANDOM_SIZE;
 315                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 316                 p+=SSL3_RANDOM_SIZE;
 317                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 318                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 319                 key=tmp1;
 320
 321                 if (k > 0)
 322                         {
 323                         p=buf;
 324                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 325                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 326                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 327                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 328                         p+=SSL3_RANDOM_SIZE;
 329                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 330                         p+=SSL3_RANDOM_SIZE;
 331                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 332                                  iv1,iv2,k*2);
 333                         if (client_write)
 334                                 iv=iv1;
 335                         else
 336                                 iv= &(iv1[k]);
 337                         }
 338                 }
 339
 340         s->session->key_arg_length=0;
 341 #ifdef KSSL_DEBUG
 342         {
 343         int i;
 344         printf("EVP_CipherInit(dd,c,key=,iv=,which)\n");
 345         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 346         printf("\n");
 347         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 348         printf("\n");
 349         }
 350 #endif  /* KSSL_DEBUG */
 351
 352         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 353 #ifdef TLS_DEBUG
 354 printf("which = %04X\nkey=",which);
 355 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 356 printf("\niv=");
 357 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 358 printf("\n");
 359 #endif
 360
 361         memset(tmp1,0,sizeof(tmp1));
 362         memset(tmp2,0,sizeof(tmp1));
 363         memset(iv1,0,sizeof(iv1));
 364         memset(iv2,0,sizeof(iv2));
 365         return(1);
 366 err:
 367         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 368 err2:
 369         return(0);
 370         }
 371
 372 int tls1_setup_key_block(SSL *s)
 373         {
 374         unsigned char *p1,*p2;
 375         const EVP_CIPHER *c;
 376         const EVP_MD *hash;
 377         int num;
 378         SSL_COMP *comp;
 379
 380 #ifdef KSSL_DEBUG
 381         printf ("tls1_setup_key_block()\n");
 382 #endif  /* KSSL_DEBUG */
 383
 384         if (s->s3->tmp.key_block_length != 0)
 385                 return(1);
 386
 387         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 388                 {
 389                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 390                 return(0);
 391                 }
 392
 393         s->s3->tmp.new_sym_enc=c;
 394         s->s3->tmp.new_hash=hash;
 395
 396         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 397         num*=2;
 398
 399         ssl3_cleanup_key_block(s);
 400
 401         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 402                 goto err;
 403         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 404                 goto err;
 405
 406         s->s3->tmp.key_block_length=num;
 407         s->s3->tmp.key_block=p1;
 408
 409
 410 #ifdef TLS_DEBUG
 411 printf("client random\n");
 412 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 413 printf("server random\n");
 414 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 415 printf("pre-master\n");
 416 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 417 #endif
 418         tls1_generate_key_block(s,p1,p2,num);
 419         memset(p2,0,num);
 420         OPENSSL_free(p2);
 421 #ifdef TLS_DEBUG
 422 printf("\nkey block\n");
 423 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 424 #endif
 425
 426         return(1);
 427 err:
 428         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 429         return(0);
 430         }
 431
 432 int tls1_enc(SSL *s, int send)
 433         {
 434         SSL3_RECORD *rec;
 435         EVP_CIPHER_CTX *ds;
 436         unsigned long l;
 437         int bs,i,ii,j,k,n=0;
 438         const EVP_CIPHER *enc;
 439
 440         if (send)
 441                 {
 442                 if (s->write_hash != NULL)
 443                         n=EVP_MD_size(s->write_hash);
 444                 ds=s->enc_write_ctx;
 445                 rec= &(s->s3->wrec);
 446                 if (s->enc_write_ctx == NULL)
 447                         enc=NULL;
 448                 else
 449                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 450                 }
 451         else
 452                 {
 453                 if (s->read_hash != NULL)
 454                         n=EVP_MD_size(s->read_hash);
 455                 ds=s->enc_read_ctx;
 456                 rec= &(s->s3->rrec);
 457                 if (s->enc_read_ctx == NULL)
 458                         enc=NULL;
 459                 else
 460                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 461                 }
 462
 463 #ifdef KSSL_DEBUG
 464         printf("tls1_enc(%d)\n", send);
 465 #endif    /* KSSL_DEBUG */
 466
 467         if ((s->session == NULL) || (ds == NULL) ||
 468                 (enc == NULL))
 469                 {
 470                 memmove(rec->data,rec->input,rec->length);
 471                 rec->input=rec->data;
 472                 }
 473         else
 474                 {
 475                 l=rec->length;
 476                 bs=EVP_CIPHER_block_size(ds->cipher);
 477
 478                 if ((bs != 1) && send)
 479                         {
 480                         i=bs-((int)l%bs);
 481
 482                         /* Add weird padding of upto 256 bytes */
 483
 484                         /* we need to add 'i' padding bytes of value j */
 485                         j=i-1;
 486                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 487                                 {
 488                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 489                                         j++;
 490                                 }
 491                         for (k=(int)l; k<(int)(l+i); k++)
 492                                 rec->input[k]=j;
 493                         l+=i;
 494                         rec->length+=i;
 495                         }
 496
 497 #ifdef KSSL_DEBUG
 498                 {
 499                 unsigned long ui;
 500                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 501                         ds,rec->data,rec->input,l);
 502                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 503                         ds->buf_len, ds->cipher->key_len,
 504                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 505                         ds->cipher->iv_len);
 506                 printf("\t\tIV: ");
 507                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 508                 printf("\n");
 509                 printf("\trec->input=");
 510                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 511                 printf("\n");
 512                 }
 513 #endif  /* KSSL_DEBUG */
 514
 515                 if (!send)
 516                         {
 517                         if (l == 0 || l%bs != 0)
 518                                 {
 519                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 520                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 521                                 return 0;
 522                                 }
 523                         }
 524
 525                 EVP_Cipher(ds,rec->data,rec->input,l);
 526
 527 #ifdef KSSL_DEBUG
 528                 {
 529                 unsigned long i;
 530                 printf("\trec->data=");
 531                 for (i=0; i<l; i++)
 532                         printf(" %02x", rec->data[i]);  printf("\n");
 533                 }
 534 #endif  /* KSSL_DEBUG */
 535
 536                 if ((bs != 1) && !send)
 537                         {
 538                         ii=i=rec->data[l-1]; /* padding_length */
 539                         i++;
 540                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 541                                 {
 542                                 /* First packet is even in size, so check */
 543                                 if ((memcmp(s->s3->read_sequence,
 544                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 545                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 546                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 547                                         i--;
 548                                 }
 549                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 550                          * All of them must have value 'padding_length'. */
 551                         if (i > (int)rec->length)
 552                                 {
 553                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 554                                  * by caller: we don't want to reveal whether this is
 555                                  * a decryption error or a MAC verification failure
 556                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 557                                 return -1;
 558                                 }
 559                         for (j=(int)(l-i); j<(int)l; j++)
 560                                 {
 561                                 if (rec->data[j] != ii)
 562                                         {
 563                                         /* Incorrect padding */
 564                                         return -1;
 565                                         }
 566                                 }
 567                         rec->length-=i;
 568                         }
 569                 }
 570         return(1);
 571         }
 572
 573 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 574         {
 575         unsigned int ret;
 576         EVP_MD_CTX ctx;
 577
 578         EVP_MD_CTX_init(&ctx);
 579         EVP_MD_CTX_copy(&ctx,in_ctx);
 580         EVP_DigestFinal(&ctx,out,&ret);
 581         EVP_MD_CTX_cleanup(&ctx);
 582         return((int)ret);
 583         }
 584
 585 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 586              const char *str, int slen, unsigned char *out)
 587         {
 588         unsigned int i;
 589         EVP_MD_CTX ctx;
 590         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 591         unsigned char *q,buf2[12];
 592
 593         q=buf;
 594         memcpy(q,str,slen);
 595         q+=slen;
 596
 597         EVP_MD_CTX_init(&ctx);
 598         EVP_MD_CTX_copy(&ctx,in1_ctx);
 599         EVP_DigestFinal(&ctx,q,&i);
 600         q+=i;
 601         EVP_MD_CTX_copy(&ctx,in2_ctx);
 602         EVP_DigestFinal(&ctx,q,&i);
 603         q+=i;
 604
 605         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 606                 s->session->master_key,s->session->master_key_length,
 607                 out,buf2,12);
 608         EVP_MD_CTX_cleanup(&ctx);
 609
 610         return((int)12);
 611         }
 612
 613 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 614         {
 615         SSL3_RECORD *rec;
 616         unsigned char *mac_sec,*seq;
 617         const EVP_MD *hash;
 618         unsigned int md_size;
 619         int i;
 620         HMAC_CTX hmac;
 621         unsigned char buf[5];
 622
 623         if (send)
 624                 {
 625                 rec= &(ssl->s3->wrec);
 626                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 627                 seq= &(ssl->s3->write_sequence[0]);
 628                 hash=ssl->write_hash;
 629                 }
 630         else
 631                 {
 632                 rec= &(ssl->s3->rrec);
 633                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 634                 seq= &(ssl->s3->read_sequence[0]);
 635                 hash=ssl->read_hash;
 636                 }
 637
 638         md_size=EVP_MD_size(hash);
 639
 640         buf[0]=rec->type;
 641         buf[1]=TLS1_VERSION_MAJOR;
 642         buf[2]=TLS1_VERSION_MINOR;
 643         buf[3]=rec->length>>8;
 644         buf[4]=rec->length&0xff;
 645
 646         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 647         HMAC_CTX_init(&hmac);
 648         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 649         HMAC_Update(&hmac,seq,8);
 650         HMAC_Update(&hmac,buf,5);
 651         HMAC_Update(&hmac,rec->input,rec->length);
 652         HMAC_Final(&hmac,md,&md_size);
 653         HMAC_CTX_cleanup(&hmac);
 654
 655 #ifdef TLS_DEBUG
 656 printf("sec=");
 657 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 658 printf("seq=");
 659 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 660 printf("buf=");
 661 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 662 printf("rec=");
 663 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 664 #endif
 665
 666         for (i=7; i>=0; i--)
 667                 {
 668                 ++seq[i];
 669                 if (seq[i] != 0) break;
 670                 }
 671
 672 #ifdef TLS_DEBUG
 673 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 674 #endif
 675         return(md_size);
 676         }
 677
 678 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 679              int len)
 680         {
 681         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 682         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 683
 684 #ifdef KSSL_DEBUG
 685         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 686 #endif  /* KSSL_DEBUG */
 687
 688         /* Setup the stuff to munge */
 689         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 690                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 691         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 692                 s->s3->client_random,SSL3_RANDOM_SIZE);
 693         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 694                 s->s3->server_random,SSL3_RANDOM_SIZE);
 695         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 696                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 697                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 698 #ifdef KSSL_DEBUG
 699         printf ("tls1_generate_master_secret() complete\n");
 700 #endif  /* KSSL_DEBUG */
 701         return(SSL3_MASTER_SECRET_SIZE);
 702         }
 703
 704 int tls1_alert_code(int code)
 705         {
 706         switch (code)
 707                 {
 708         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 709         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 710         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 711         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 712         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 713         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 714         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 715         case SSL_AD_NO_CERTIFICATE:     return(-1);
 716         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 717         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 718         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 719         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 720         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 721         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 722         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 723         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 724         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 725         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 726         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 727         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 728         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 729         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 730         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 731         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 732         default:                        return(-1);
 733                 }
 734         }
 735