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  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include <openssl/comp.h>
 115 #include <openssl/evp.h>
 116 #include <openssl/hmac.h>
 117 #include <openssl/md5.h>
 118
 119 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 120                         int sec_len, unsigned char *seed, int seed_len,
 121                         unsigned char *out, int olen)
 122         {
 123         int chunk,n;
 124         unsigned int j;
 125         HMAC_CTX ctx;
 126         HMAC_CTX ctx_tmp;
 127         unsigned char A1[EVP_MAX_MD_SIZE];
 128         unsigned int A1_len;
 129
 130         chunk=EVP_MD_size(md);
 131
 132         HMAC_CTX_init(&ctx);
 133         HMAC_CTX_init(&ctx_tmp);
 134         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 135         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 136         HMAC_Update(&ctx,seed,seed_len);
 137         HMAC_Final(&ctx,A1,&A1_len);
 138
 139         n=0;
 140         for (;;)
 141                 {
 142                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 143                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 144                 HMAC_Update(&ctx,A1,A1_len);
 145                 HMAC_Update(&ctx_tmp,A1,A1_len);
 146                 HMAC_Update(&ctx,seed,seed_len);
 147
 148                 if (olen > chunk)
 149                         {
 150                         HMAC_Final(&ctx,out,&j);
 151                         out+=j;
 152                         olen-=j;
 153                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 154                         }
 155                 else    /* last one */
 156                         {
 157                         HMAC_Final(&ctx,A1,&A1_len);
 158                         memcpy(out,A1,olen);
 159                         break;
 160                         }
 161                 }
 162         HMAC_CTX_cleanup(&ctx);
 163         HMAC_CTX_cleanup(&ctx_tmp);
 164         OPENSSL_cleanse(A1,sizeof(A1));
 165         }
 166
 167 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 168                      unsigned char *label, int label_len,
 169                      const unsigned char *sec, int slen, unsigned char *out1,
 170                      unsigned char *out2, int olen)
 171         {
 172         int len,i;
 173         const unsigned char *S1,*S2;
 174
 175         len=slen/2;
 176         S1=sec;
 177         S2= &(sec[len]);
 178         len+=(slen&1); /* add for odd, make longer */
 179
 180
 181         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 182         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 183
 184         for (i=0; i<olen; i++)
 185                 out1[i]^=out2[i];
 186         }
 187
 188 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 189              unsigned char *tmp, int num)
 190         {
 191         unsigned char *p;
 192         unsigned char buf[SSL3_RANDOM_SIZE*2+
 193                 TLS_MD_MAX_CONST_SIZE];
 194         p=buf;
 195
 196         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 197                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 198         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 199         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 200         p+=SSL3_RANDOM_SIZE;
 201         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 202         p+=SSL3_RANDOM_SIZE;
 203
 204         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 205                  s->session->master_key,s->session->master_key_length,
 206                  km,tmp,num);
 207 #ifdef KSSL_DEBUG
 208         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 209                 s->session->master_key_length);
 210         {
 211         int i;
 212         for (i=0; i < s->session->master_key_length; i++)
 213                 {
 214                 printf("%02X", s->session->master_key[i]);
 215                 }
 216         printf("\n");  }
 217 #endif    /* KSSL_DEBUG */
 218         }
 219
 220 int tls1_change_cipher_state(SSL *s, int which)
 221         {
 222         static const unsigned char empty[]="";
 223         unsigned char *p,*key_block,*mac_secret;
 224         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 225                 SSL3_RANDOM_SIZE*2];
 226         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 227         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 228         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 229         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 230         unsigned char *ms,*key,*iv,*er1,*er2;
 231         int client_write;
 232         EVP_CIPHER_CTX *dd;
 233         const EVP_CIPHER *c;
 234         const SSL_COMP *comp;
 235         const EVP_MD *m;
 236         int is_export,n,i,j,k,exp_label_len,cl;
 237         int reuse_dd = 0;
 238
 239         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 240         c=s->s3->tmp.new_sym_enc;
 241         m=s->s3->tmp.new_hash;
 242         comp=s->s3->tmp.new_compression;
 243         key_block=s->s3->tmp.key_block;
 244
 245 #ifdef KSSL_DEBUG
 246         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 247         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 248                 comp);
 249         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 250         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 251                 c->nid,c->block_size,c->key_len,c->iv_len);
 252         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 253         {
 254         int i;
 255         for (i=0; i<s->s3->tmp.key_block_length; i++)
 256                 printf("%02x", key_block[i]);  printf("\n");
 257         }
 258 #endif  /* KSSL_DEBUG */
 259
 260         if (which & SSL3_CC_READ)
 261                 {
 262                 if (s->enc_read_ctx != NULL)
 263                         reuse_dd = 1;
 264                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 265                         goto err;
 266                 dd= s->enc_read_ctx;
 267                 s->read_hash=m;
 268                 if (s->expand != NULL)
 269                         {
 270                         COMP_CTX_free(s->expand);
 271                         s->expand=NULL;
 272                         }
 273                 if (comp != NULL)
 274                         {
 275                         s->expand=COMP_CTX_new(comp->method);
 276                         if (s->expand == NULL)
 277                                 {
 278                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 279                                 goto err2;
 280                                 }
 281                         if (s->s3->rrec.comp == NULL)
 282                                 s->s3->rrec.comp=(unsigned char *)
 283                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 284                         if (s->s3->rrec.comp == NULL)
 285                                 goto err;
 286                         }
 287                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 288                 if (s->version != DTLS1_VERSION)
 289                         memset(&(s->s3->read_sequence[0]),0,8);
 290                 mac_secret= &(s->s3->read_mac_secret[0]);
 291                 }
 292         else
 293                 {
 294                 if (s->enc_write_ctx != NULL)
 295                         reuse_dd = 1;
 296                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 297                         goto err;
 298                 if ((s->enc_write_ctx == NULL) &&
 299                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 300                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 301                         goto err;
 302                 dd= s->enc_write_ctx;
 303                 s->write_hash=m;
 304                 if (s->compress != NULL)
 305                         {
 306                         COMP_CTX_free(s->compress);
 307                         s->compress=NULL;
 308                         }
 309                 if (comp != NULL)
 310                         {
 311                         s->compress=COMP_CTX_new(comp->method);
 312                         if (s->compress == NULL)
 313                                 {
 314                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 315                                 goto err2;
 316                                 }
 317                         }
 318                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 319                 if (s->version != DTLS1_VERSION)
 320                         memset(&(s->s3->write_sequence[0]),0,8);
 321                 mac_secret= &(s->s3->write_mac_secret[0]);
 322                 }
 323
 324         if (reuse_dd)
 325                 EVP_CIPHER_CTX_cleanup(dd);
 326         EVP_CIPHER_CTX_init(dd);
 327
 328         p=s->s3->tmp.key_block;
 329         i=EVP_MD_size(m);
 330         cl=EVP_CIPHER_key_length(c);
 331         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 332                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 333         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 334         k=EVP_CIPHER_iv_length(c);
 335         er1= &(s->s3->client_random[0]);
 336         er2= &(s->s3->server_random[0]);
 337         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 338                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 339                 {
 340                 ms=  &(p[ 0]); n=i+i;
 341                 key= &(p[ n]); n+=j+j;
 342                 iv=  &(p[ n]); n+=k+k;
 343                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 344                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 345                 client_write=1;
 346                 }
 347         else
 348                 {
 349                 n=i;
 350                 ms=  &(p[ n]); n+=i+j;
 351                 key= &(p[ n]); n+=j+k;
 352                 iv=  &(p[ n]); n+=k;
 353                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 354                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 355                 client_write=0;
 356                 }
 357
 358         if (n > s->s3->tmp.key_block_length)
 359                 {
 360                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 361                 goto err2;
 362                 }
 363
 364         memcpy(mac_secret,ms,i);
 365 #ifdef TLS_DEBUG
 366 printf("which = %04X\nmac key=",which);
 367 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 368 #endif
 369         if (is_export)
 370                 {
 371                 /* In here I set both the read and write key/iv to the
 372                  * same value since only the correct one will be used :-).
 373                  */
 374                 p=buf;
 375                 memcpy(p,exp_label,exp_label_len);
 376                 p+=exp_label_len;
 377                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 378                 p+=SSL3_RANDOM_SIZE;
 379                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 380                 p+=SSL3_RANDOM_SIZE;
 381                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 382                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 383                 key=tmp1;
 384
 385                 if (k > 0)
 386                         {
 387                         p=buf;
 388                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 389                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 390                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 391                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 392                         p+=SSL3_RANDOM_SIZE;
 393                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 394                         p+=SSL3_RANDOM_SIZE;
 395                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 396                                  iv1,iv2,k*2);
 397                         if (client_write)
 398                                 iv=iv1;
 399                         else
 400                                 iv= &(iv1[k]);
 401                         }
 402                 }
 403
 404         s->session->key_arg_length=0;
 405 #ifdef KSSL_DEBUG
 406         {
 407         int i;
 408         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 409         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 410         printf("\n");
 411         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 412         printf("\n");
 413         }
 414 #endif  /* KSSL_DEBUG */
 415
 416         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 417 #ifdef TLS_DEBUG
 418 printf("which = %04X\nkey=",which);
 419 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 420 printf("\niv=");
 421 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 422 printf("\n");
 423 #endif
 424
 425         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 426         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 427         OPENSSL_cleanse(iv1,sizeof(iv1));
 428         OPENSSL_cleanse(iv2,sizeof(iv2));
 429         return(1);
 430 err:
 431         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 432 err2:
 433         return(0);
 434         }
 435
 436 int tls1_setup_key_block(SSL *s)
 437         {
 438         unsigned char *p1,*p2;
 439         const EVP_CIPHER *c;
 440         const EVP_MD *hash;
 441         int num;
 442         SSL_COMP *comp;
 443
 444 #ifdef KSSL_DEBUG
 445         printf ("tls1_setup_key_block()\n");
 446 #endif  /* KSSL_DEBUG */
 447
 448         if (s->s3->tmp.key_block_length != 0)
 449                 return(1);
 450
 451         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 452                 {
 453                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 454                 return(0);
 455                 }
 456
 457         s->s3->tmp.new_sym_enc=c;
 458         s->s3->tmp.new_hash=hash;
 459
 460         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 461         num*=2;
 462
 463         ssl3_cleanup_key_block(s);
 464
 465         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 466                 goto err;
 467         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 468                 goto err;
 469
 470         s->s3->tmp.key_block_length=num;
 471         s->s3->tmp.key_block=p1;
 472
 473
 474 #ifdef TLS_DEBUG
 475 printf("client random\n");
 476 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 477 printf("server random\n");
 478 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 479 printf("pre-master\n");
 480 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 481 #endif
 482         tls1_generate_key_block(s,p1,p2,num);
 483         OPENSSL_cleanse(p2,num);
 484         OPENSSL_free(p2);
 485 #ifdef TLS_DEBUG
 486 printf("\nkey block\n");
 487 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 488 #endif
 489
 490         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 491                 {
 492                 /* enable vulnerability countermeasure for CBC ciphers with
 493                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 494                  */
 495                 s->s3->need_empty_fragments = 1;
 496
 497                 if (s->session->cipher != NULL)
 498                         {
 499                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 500                                 s->s3->need_empty_fragments = 0;
 501
 502 #ifndef OPENSSL_NO_RC4
 503                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 504                                 s->s3->need_empty_fragments = 0;
 505 #endif
 506                         }
 507                 }
 508
 509         return(1);
 510 err:
 511         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 512         return(0);
 513         }
 514
 515 int tls1_enc(SSL *s, int send)
 516         {
 517         SSL3_RECORD *rec;
 518         EVP_CIPHER_CTX *ds;
 519         unsigned long l;
 520         int bs,i,ii,j,k,n=0;
 521         const EVP_CIPHER *enc;
 522
 523         if (send)
 524                 {
 525                 if (s->write_hash != NULL)
 526                         n=EVP_MD_size(s->write_hash);
 527                 ds=s->enc_write_ctx;
 528                 rec= &(s->s3->wrec);
 529                 if (s->enc_write_ctx == NULL)
 530                         enc=NULL;
 531                 else
 532                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 533                 }
 534         else
 535                 {
 536                 if (s->read_hash != NULL)
 537                         n=EVP_MD_size(s->read_hash);
 538                 ds=s->enc_read_ctx;
 539                 rec= &(s->s3->rrec);
 540                 if (s->enc_read_ctx == NULL)
 541                         enc=NULL;
 542                 else
 543                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 544                 }
 545
 546 #ifdef KSSL_DEBUG
 547         printf("tls1_enc(%d)\n", send);
 548 #endif    /* KSSL_DEBUG */
 549
 550         if ((s->session == NULL) || (ds == NULL) ||
 551                 (enc == NULL))
 552                 {
 553                 memmove(rec->data,rec->input,rec->length);
 554                 rec->input=rec->data;
 555                 }
 556         else
 557                 {
 558                 l=rec->length;
 559                 bs=EVP_CIPHER_block_size(ds->cipher);
 560
 561                 if ((bs != 1) && send)
 562                         {
 563                         i=bs-((int)l%bs);
 564
 565                         /* Add weird padding of upto 256 bytes */
 566
 567                         /* we need to add 'i' padding bytes of value j */
 568                         j=i-1;
 569                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 570                                 {
 571                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 572                                         j++;
 573                                 }
 574                         for (k=(int)l; k<(int)(l+i); k++)
 575                                 rec->input[k]=j;
 576                         l+=i;
 577                         rec->length+=i;
 578                         }
 579
 580 #ifdef KSSL_DEBUG
 581                 {
 582                 unsigned long ui;
 583                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 584                         ds,rec->data,rec->input,l);
 585                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 586                         ds->buf_len, ds->cipher->key_len,
 587                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 588                         ds->cipher->iv_len);
 589                 printf("\t\tIV: ");
 590                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 591                 printf("\n");
 592                 printf("\trec->input=");
 593                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 594                 printf("\n");
 595                 }
 596 #endif  /* KSSL_DEBUG */
 597
 598                 if (!send)
 599                         {
 600                         if (l == 0 || l%bs != 0)
 601                                 {
 602                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 603                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 604                                 return 0;
 605                                 }
 606                         }
 607
 608                 EVP_Cipher(ds,rec->data,rec->input,l);
 609
 610 #ifdef KSSL_DEBUG
 611                 {
 612                 unsigned long i;
 613                 printf("\trec->data=");
 614                 for (i=0; i<l; i++)
 615                         printf(" %02x", rec->data[i]);  printf("\n");
 616                 }
 617 #endif  /* KSSL_DEBUG */
 618
 619                 if ((bs != 1) && !send)
 620                         {
 621                         ii=i=rec->data[l-1]; /* padding_length */
 622                         i++;
 623                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 624                                 {
 625                                 /* First packet is even in size, so check */
 626                                 if ((memcmp(s->s3->read_sequence,
 627                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 628                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 629                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 630                                         i--;
 631                                 }
 632                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 633                          * All of them must have value 'padding_length'. */
 634                         if (i > (int)rec->length)
 635                                 {
 636                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 637                                  * by caller: we don't want to reveal whether this is
 638                                  * a decryption error or a MAC verification failure
 639                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 640                                 return -1;
 641                                 }
 642                         for (j=(int)(l-i); j<(int)l; j++)
 643                                 {
 644                                 if (rec->data[j] != ii)
 645                                         {
 646                                         /* Incorrect padding */
 647                                         return -1;
 648                                         }
 649                                 }
 650                         rec->length-=i;
 651                         }
 652                 }
 653         return(1);
 654         }
 655
 656 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 657         {
 658         unsigned int ret;
 659         EVP_MD_CTX ctx;
 660
 661         EVP_MD_CTX_init(&ctx);
 662         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 663         EVP_DigestFinal_ex(&ctx,out,&ret);
 664         EVP_MD_CTX_cleanup(&ctx);
 665         return((int)ret);
 666         }
 667
 668 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 669              const char *str, int slen, unsigned char *out)
 670         {
 671         unsigned int i;
 672         EVP_MD_CTX ctx;
 673         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 674         unsigned char *q,buf2[12];
 675
 676         q=buf;
 677         memcpy(q,str,slen);
 678         q+=slen;
 679
 680         EVP_MD_CTX_init(&ctx);
 681         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 682         EVP_DigestFinal_ex(&ctx,q,&i);
 683         q+=i;
 684         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 685         EVP_DigestFinal_ex(&ctx,q,&i);
 686         q+=i;
 687
 688         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 689                 s->session->master_key,s->session->master_key_length,
 690                 out,buf2,sizeof buf2);
 691         EVP_MD_CTX_cleanup(&ctx);
 692
 693         return sizeof buf2;
 694         }
 695
 696 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 697         {
 698         SSL3_RECORD *rec;
 699         unsigned char *mac_sec,*seq;
 700         const EVP_MD *hash;
 701         unsigned int md_size;
 702         int i;
 703         HMAC_CTX hmac;
 704         unsigned char buf[5];
 705
 706         if (send)
 707                 {
 708                 rec= &(ssl->s3->wrec);
 709                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 710                 seq= &(ssl->s3->write_sequence[0]);
 711                 hash=ssl->write_hash;
 712                 }
 713         else
 714                 {
 715                 rec= &(ssl->s3->rrec);
 716                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 717                 seq= &(ssl->s3->read_sequence[0]);
 718                 hash=ssl->read_hash;
 719                 }
 720
 721         md_size=EVP_MD_size(hash);
 722
 723         buf[0]=rec->type;
 724         buf[1]=TLS1_VERSION_MAJOR;
 725         buf[2]=TLS1_VERSION_MINOR;
 726         buf[3]=rec->length>>8;
 727         buf[4]=rec->length&0xff;
 728
 729         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 730         HMAC_CTX_init(&hmac);
 731         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 732         HMAC_Update(&hmac,seq,8);
 733         HMAC_Update(&hmac,buf,5);
 734         HMAC_Update(&hmac,rec->input,rec->length);
 735         HMAC_Final(&hmac,md,&md_size);
 736         HMAC_CTX_cleanup(&hmac);
 737
 738 #ifdef TLS_DEBUG
 739 printf("sec=");
 740 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 741 printf("seq=");
 742 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 743 printf("buf=");
 744 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 745 printf("rec=");
 746 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 747 #endif
 748
 749     if ( SSL_version(ssl) != DTLS1_VERSION)
 750             {
 751                 for (i=7; i>=0; i--)
 752                         {
 753                         ++seq[i];
 754                         if (seq[i] != 0) break;
 755                         }
 756                 }
 757
 758 #ifdef TLS_DEBUG
 759 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 760 #endif
 761         return(md_size);
 762         }
 763
 764 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 765              int len)
 766         {
 767         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 768         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 769
 770 #ifdef KSSL_DEBUG
 771         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 772 #endif  /* KSSL_DEBUG */
 773
 774         /* Setup the stuff to munge */
 775         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 776                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 777         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 778                 s->s3->client_random,SSL3_RANDOM_SIZE);
 779         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 780                 s->s3->server_random,SSL3_RANDOM_SIZE);
 781         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 782                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 783                 s->session->master_key,buff,sizeof buff);
 784 #ifdef KSSL_DEBUG
 785         printf ("tls1_generate_master_secret() complete\n");
 786 #endif  /* KSSL_DEBUG */
 787         return(SSL3_MASTER_SECRET_SIZE);
 788         }
 789
 790 int tls1_alert_code(int code)
 791         {
 792         switch (code)
 793                 {
 794         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 795         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 796         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 797         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 798         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 799         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 800         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 801         case SSL_AD_NO_CERTIFICATE:     return(-1);
 802         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 803         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 804         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 805         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 806         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 807         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 808         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 809         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 810         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 811         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 812         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 813         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 814         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 815         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 816         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 817         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 818         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 819                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 820         default:                        return(-1);
 821                 }
 822         }
 823