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/md5.h>
  62 #include <openssl/sha.h>
  63 #include <openssl/evp.h>
  64 #include <openssl/hmac.h>
  65 #include "ssl_locl.h"
  66
  67 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
  68                         int sec_len, unsigned char *seed, int seed_len,
  69                         unsigned char *out, int olen)
  70         {
  71         int chunk,n;
  72         unsigned int j;
  73         HMAC_CTX ctx;
  74         HMAC_CTX ctx_tmp;
  75         unsigned char A1[HMAC_MAX_MD_CBLOCK];
  76         unsigned int A1_len;
  77
  78         chunk=EVP_MD_size(md);
  79
  80         HMAC_Init(&ctx,sec,sec_len,md);
  81         HMAC_Update(&ctx,seed,seed_len);
  82         HMAC_Final(&ctx,A1,&A1_len);
  83
  84         n=0;
  85         for (;;)
  86                 {
  87                 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */
  88                 HMAC_Update(&ctx,A1,A1_len);
  89                 memcpy(&ctx_tmp,&ctx,sizeof(ctx)); /* Copy for A2 */ /* not needed for last one */
  90                 HMAC_Update(&ctx,seed,seed_len);
  91
  92                 if (olen > chunk)
  93                         {
  94                         HMAC_Final(&ctx,out,&j);
  95                         out+=j;
  96                         olen-=j;
  97                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
  98                         }
  99                 else    /* last one */
 100                         {
 101                         HMAC_Final(&ctx,A1,&A1_len);
 102                         memcpy(out,A1,olen);
 103                         break;
 104                         }
 105                 }
 106         HMAC_cleanup(&ctx);
 107         HMAC_cleanup(&ctx_tmp);
 108         memset(A1,0,sizeof(A1));
 109         }
 110
 111 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 112                      unsigned char *label, int label_len,
 113                      const unsigned char *sec, int slen, unsigned char *out1,
 114                      unsigned char *out2, int olen)
 115         {
 116         int len,i;
 117         const unsigned char *S1,*S2;
 118
 119         len=slen/2;
 120         S1=sec;
 121         S2= &(sec[len]);
 122         len+=(slen&1); /* add for odd, make longer */
 123
 124
 125         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 126         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 127
 128         for (i=0; i<olen; i++)
 129                 out1[i]^=out2[i];
 130         }
 131
 132 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 133              unsigned char *tmp, int num)
 134         {
 135         unsigned char *p;
 136         unsigned char buf[SSL3_RANDOM_SIZE*2+
 137                 TLS_MD_MAX_CONST_SIZE];
 138         p=buf;
 139
 140         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 141                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 142         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 143         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 144         p+=SSL3_RANDOM_SIZE;
 145         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 146         p+=SSL3_RANDOM_SIZE;
 147
 148         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 149                  s->session->master_key,s->session->master_key_length,
 150                  km,tmp,num);
 151 #ifdef KSSL_DEBUG
 152         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 153                 s->session->master_key_length);
 154         {
 155         int i;
 156         for (i=0; i < s->session->master_key_length; i++)
 157                 {
 158                 printf("%02X", s->session->master_key[i]);
 159                 }
 160         printf("\n");  }
 161 #endif    /* KSSL_DEBUG */
 162         }
 163
 164 int tls1_change_cipher_state(SSL *s, int which)
 165         {
 166         static const unsigned char empty[]="";
 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         const EVP_CIPHER *c;
 178         const SSL_COMP *comp;
 179         const EVP_MD *m;
 180         int _exp,n,i,j,k,exp_label_len,cl;
 181
 182         _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 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 #ifdef KSSL_DEBUG
 189         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 190         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 191                 comp);
 192         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 193         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 194                 c->nid,c->block_size,c->key_len,c->iv_len);
 195         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 196         {
 197         int i;
 198         for (i=0; i<s->s3->tmp.key_block_length; i++)
 199                 printf("%02x", key_block[i]);  printf("\n");
 200         }
 201 #endif  /* KSSL_DEBUG */
 202
 203         if (which & SSL3_CC_READ)
 204                 {
 205                 if ((s->enc_read_ctx == NULL) &&
 206                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 207                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 208                         goto err;
 209                 dd= s->enc_read_ctx;
 210                 s->read_hash=m;
 211                 if (s->expand != NULL)
 212                         {
 213                         COMP_CTX_free(s->expand);
 214                         s->expand=NULL;
 215                         }
 216                 if (comp != NULL)
 217                         {
 218                         s->expand=COMP_CTX_new(comp->method);
 219                         if (s->expand == NULL)
 220                                 {
 221                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 222                                 goto err2;
 223                                 }
 224                         if (s->s3->rrec.comp == NULL)
 225                                 s->s3->rrec.comp=(unsigned char *)
 226                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 227                         if (s->s3->rrec.comp == NULL)
 228                                 goto err;
 229                         }
 230                 memset(&(s->s3->read_sequence[0]),0,8);
 231                 mac_secret= &(s->s3->read_mac_secret[0]);
 232                 }
 233         else
 234                 {
 235                 if ((s->enc_write_ctx == NULL) &&
 236                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 237                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 238                         goto err;
 239                 dd= s->enc_write_ctx;
 240                 s->write_hash=m;
 241                 if (s->compress != NULL)
 242                         {
 243                         COMP_CTX_free(s->compress);
 244                         s->compress=NULL;
 245                         }
 246                 if (comp != NULL)
 247                         {
 248                         s->compress=COMP_CTX_new(comp->method);
 249                         if (s->compress == NULL)
 250                                 {
 251                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 252                                 goto err2;
 253                                 }
 254                         }
 255                 memset(&(s->s3->write_sequence[0]),0,8);
 256                 mac_secret= &(s->s3->write_mac_secret[0]);
 257                 }
 258
 259         EVP_CIPHER_CTX_init(dd);
 260
 261         p=s->s3->tmp.key_block;
 262         i=EVP_MD_size(m);
 263         cl=EVP_CIPHER_key_length(c);
 264         j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 265                   cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 266         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 267         k=EVP_CIPHER_iv_length(c);
 268         er1= &(s->s3->client_random[0]);
 269         er2= &(s->s3->server_random[0]);
 270         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 271                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 272                 {
 273                 ms=  &(p[ 0]); n=i+i;
 274                 key= &(p[ n]); n+=j+j;
 275                 iv=  &(p[ n]); n+=k+k;
 276                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 277                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 278                 client_write=1;
 279                 }
 280         else
 281                 {
 282                 n=i;
 283                 ms=  &(p[ n]); n+=i+j;
 284                 key= &(p[ n]); n+=j+k;
 285                 iv=  &(p[ n]); n+=k;
 286                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 287                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 288                 client_write=0;
 289                 }
 290
 291         if (n > s->s3->tmp.key_block_length)
 292                 {
 293                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 294                 goto err2;
 295                 }
 296
 297         memcpy(mac_secret,ms,i);
 298 #ifdef TLS_DEBUG
 299 printf("which = %04X\nmac key=",which);
 300 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 301 #endif
 302         if (_exp)
 303                 {
 304                 /* In here I set both the read and write key/iv to the
 305                  * same value since only the correct one will be used :-).
 306                  */
 307                 p=buf;
 308                 memcpy(p,exp_label,exp_label_len);
 309                 p+=exp_label_len;
 310                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 311                 p+=SSL3_RANDOM_SIZE;
 312                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 313                 p+=SSL3_RANDOM_SIZE;
 314                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 315                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 316                 key=tmp1;
 317
 318                 if (k > 0)
 319                         {
 320                         p=buf;
 321                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 322                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 323                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 324                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 325                         p+=SSL3_RANDOM_SIZE;
 326                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 327                         p+=SSL3_RANDOM_SIZE;
 328                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 329                                  iv1,iv2,k*2);
 330                         if (client_write)
 331                                 iv=iv1;
 332                         else
 333                                 iv= &(iv1[k]);
 334                         }
 335                 }
 336
 337         s->session->key_arg_length=0;
 338 #ifdef KSSL_DEBUG
 339         {
 340         int i;
 341         printf("EVP_CipherInit(dd,c,key=,iv=,which)\n");
 342         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 343         printf("\n");
 344         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 345         printf("\n");
 346         }
 347 #endif  /* KSSL_DEBUG */
 348
 349         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 350 #ifdef TLS_DEBUG
 351 printf("which = %04X\nkey=",which);
 352 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 353 printf("\niv=");
 354 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 355 printf("\n");
 356 #endif
 357
 358         memset(tmp1,0,sizeof(tmp1));
 359         memset(tmp2,0,sizeof(tmp1));
 360         memset(iv1,0,sizeof(iv1));
 361         memset(iv2,0,sizeof(iv2));
 362         return(1);
 363 err:
 364         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 365 err2:
 366         return(0);
 367         }
 368
 369 int tls1_setup_key_block(SSL *s)
 370         {
 371         unsigned char *p1,*p2;
 372         const EVP_CIPHER *c;
 373         const EVP_MD *hash;
 374         int num;
 375         SSL_COMP *comp;
 376
 377 #ifdef KSSL_DEBUG
 378         printf ("tls1_setup_key_block()\n");
 379 #endif  /* KSSL_DEBUG */
 380
 381         if (s->s3->tmp.key_block_length != 0)
 382                 return(1);
 383
 384         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 385                 {
 386                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 387                 return(0);
 388                 }
 389
 390         s->s3->tmp.new_sym_enc=c;
 391         s->s3->tmp.new_hash=hash;
 392
 393         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 394         num*=2;
 395
 396         ssl3_cleanup_key_block(s);
 397
 398         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 399                 goto err;
 400         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 401                 goto err;
 402
 403         s->s3->tmp.key_block_length=num;
 404         s->s3->tmp.key_block=p1;
 405
 406
 407 #ifdef TLS_DEBUG
 408 printf("client random\n");
 409 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 410 printf("server random\n");
 411 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 412 printf("pre-master\n");
 413 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 414 #endif
 415         tls1_generate_key_block(s,p1,p2,num);
 416         memset(p2,0,num);
 417         OPENSSL_free(p2);
 418 #ifdef TLS_DEBUG
 419 printf("\nkey block\n");
 420 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 421 #endif
 422
 423         return(1);
 424 err:
 425         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 426         return(0);
 427         }
 428
 429 int tls1_enc(SSL *s, int send)
 430         {
 431         SSL3_RECORD *rec;
 432         EVP_CIPHER_CTX *ds;
 433         unsigned long l;
 434         int bs,i,ii,j,k,n=0;
 435         const EVP_CIPHER *enc;
 436
 437         if (send)
 438                 {
 439                 if (s->write_hash != NULL)
 440                         n=EVP_MD_size(s->write_hash);
 441                 ds=s->enc_write_ctx;
 442                 rec= &(s->s3->wrec);
 443                 if (s->enc_write_ctx == NULL)
 444                         enc=NULL;
 445                 else
 446                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 447                 }
 448         else
 449                 {
 450                 if (s->read_hash != NULL)
 451                         n=EVP_MD_size(s->read_hash);
 452                 ds=s->enc_read_ctx;
 453                 rec= &(s->s3->rrec);
 454                 if (s->enc_read_ctx == NULL)
 455                         enc=NULL;
 456                 else
 457                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 458                 }
 459
 460 #ifdef KSSL_DEBUG
 461         printf("tls1_enc(%d)\n", send);
 462 #endif    /* KSSL_DEBUG */
 463
 464         if ((s->session == NULL) || (ds == NULL) ||
 465                 (enc == NULL))
 466                 {
 467                 memcpy(rec->data,rec->input,rec->length);
 468                 rec->input=rec->data;
 469                 }
 470         else
 471                 {
 472                 l=rec->length;
 473                 bs=EVP_CIPHER_block_size(ds->cipher);
 474
 475                 if ((bs != 1) && send)
 476                         {
 477                         i=bs-((int)l%bs);
 478
 479                         /* Add weird padding of upto 256 bytes */
 480
 481                         /* we need to add 'i' padding bytes of value j */
 482                         j=i-1;
 483                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 484                                 {
 485                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 486                                         j++;
 487                                 }
 488                         for (k=(int)l; k<(int)(l+i); k++)
 489                                 rec->input[k]=j;
 490                         l+=i;
 491                         rec->length+=i;
 492                         }
 493
 494 #ifdef KSSL_DEBUG
 495                 {
 496                 unsigned long i;
 497                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 498                         ds,rec->data,rec->input,l);
 499                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 500                         ds->buf_len, ds->cipher->key_len,
 501                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 502                         ds->cipher->iv_len);
 503                 printf("\t\tIV: ");
 504                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 505                 printf("\n");
 506                 printf("\trec->input=");
 507                 for (i=0; i<l; i++) printf(" %02x", rec->input[i]);
 508                 printf("\n");
 509                 }
 510 #endif  /* KSSL_DEBUG */
 511
 512                 EVP_Cipher(ds,rec->data,rec->input,l);
 513
 514 #ifdef KSSL_DEBUG
 515                 {
 516                 unsigned long i;
 517                 printf("\trec->data=");
 518                 for (i=0; i<l; i++)
 519                         printf(" %02x", rec->data[i]);  printf("\n");
 520                 }
 521 #endif  /* KSSL_DEBUG */
 522
 523                 if ((bs != 1) && !send)
 524                         {
 525                         ii=i=rec->data[l-1];
 526                         i++;
 527                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 528                                 {
 529                                 /* First packet is even in size, so check */
 530                                 if ((memcmp(s->s3->read_sequence,
 531                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 532                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 533                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 534                                         i--;
 535                                 }
 536                         if (i > (int)rec->length)
 537                                 {
 538                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 539                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 540                                 return(0);
 541                                 }
 542                         for (j=(int)(l-i); j<(int)l; j++)
 543                                 {
 544                                 if (rec->data[j] != ii)
 545                                         {
 546                                         SSLerr(SSL_F_TLS1_ENC,SSL_R_DECRYPTION_FAILED);
 547                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 548                                         return(0);
 549                                         }
 550                                 }
 551                         rec->length-=i;
 552                         }
 553                 }
 554         return(1);
 555         }
 556
 557 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 558         {
 559         unsigned int ret;
 560         EVP_MD_CTX ctx;
 561
 562         EVP_MD_CTX_copy(&ctx,in_ctx);
 563         EVP_DigestFinal(&ctx,out,&ret);
 564         return((int)ret);
 565         }
 566
 567 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 568              const char *str, int slen, unsigned char *out)
 569         {
 570         unsigned int i;
 571         EVP_MD_CTX ctx;
 572         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 573         unsigned char *q,buf2[12];
 574
 575         q=buf;
 576         memcpy(q,str,slen);
 577         q+=slen;
 578
 579         EVP_MD_CTX_copy(&ctx,in1_ctx);
 580         EVP_DigestFinal(&ctx,q,&i);
 581         q+=i;
 582         EVP_MD_CTX_copy(&ctx,in2_ctx);
 583         EVP_DigestFinal(&ctx,q,&i);
 584         q+=i;
 585
 586         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 587                 s->session->master_key,s->session->master_key_length,
 588                 out,buf2,12);
 589         memset(&ctx,0,sizeof(EVP_MD_CTX));
 590
 591         return((int)12);
 592         }
 593
 594 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 595         {
 596         SSL3_RECORD *rec;
 597         unsigned char *mac_sec,*seq;
 598         const EVP_MD *hash;
 599         unsigned int md_size;
 600         int i;
 601         HMAC_CTX hmac;
 602         unsigned char buf[5];
 603
 604         if (send)
 605                 {
 606                 rec= &(ssl->s3->wrec);
 607                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 608                 seq= &(ssl->s3->write_sequence[0]);
 609                 hash=ssl->write_hash;
 610                 }
 611         else
 612                 {
 613                 rec= &(ssl->s3->rrec);
 614                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 615                 seq= &(ssl->s3->read_sequence[0]);
 616                 hash=ssl->read_hash;
 617                 }
 618
 619         md_size=EVP_MD_size(hash);
 620
 621         buf[0]=rec->type;
 622         buf[1]=TLS1_VERSION_MAJOR;
 623         buf[2]=TLS1_VERSION_MINOR;
 624         buf[3]=rec->length>>8;
 625         buf[4]=rec->length&0xff;
 626
 627         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 628         HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash);
 629         HMAC_Update(&hmac,seq,8);
 630         HMAC_Update(&hmac,buf,5);
 631         HMAC_Update(&hmac,rec->input,rec->length);
 632         HMAC_Final(&hmac,md,&md_size);
 633
 634 #ifdef TLS_DEBUG
 635 printf("sec=");
 636 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 637 printf("seq=");
 638 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 639 printf("buf=");
 640 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 641 printf("rec=");
 642 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 643 #endif
 644
 645         for (i=7; i>=0; i--)
 646                 if (++seq[i]) break;
 647
 648 #ifdef TLS_DEBUG
 649 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 650 #endif
 651         return(md_size);
 652         }
 653
 654 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 655              int len)
 656         {
 657         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 658         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 659
 660 #ifdef KSSL_DEBUG
 661         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 662 #endif  /* KSSL_DEBUG */
 663
 664         /* Setup the stuff to munge */
 665         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 666                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 667         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 668                 s->s3->client_random,SSL3_RANDOM_SIZE);
 669         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 670                 s->s3->server_random,SSL3_RANDOM_SIZE);
 671         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 672                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 673                 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE);
 674 #ifdef KSSL_DEBUG
 675         printf ("tls1_generate_master_secret() complete\n");
 676 #endif  /* KSSL_DEBUG */
 677         return(SSL3_MASTER_SECRET_SIZE);
 678         }
 679
 680 int tls1_alert_code(int code)
 681         {
 682         switch (code)
 683                 {
 684         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 685         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 686         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 687         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 688         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 689         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 690         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 691         case SSL_AD_NO_CERTIFICATE:     return(-1);
 692         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 693         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 694         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 695         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 696         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 697         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 698         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 699         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 700         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 701         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 702         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 703         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 704         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 705         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 706         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 707         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 708         default:                        return(-1);
 709                 }
 710         }
 711