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_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 135         HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 136         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 137         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 138         HMAC_Update(&ctx,seed,seed_len);
 139         HMAC_Final(&ctx,A1,&A1_len);
 140
 141         n=0;
 142         for (;;)
 143                 {
 144                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 145                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 146                 HMAC_Update(&ctx,A1,A1_len);
 147                 HMAC_Update(&ctx_tmp,A1,A1_len);
 148                 HMAC_Update(&ctx,seed,seed_len);
 149
 150                 if (olen > chunk)
 151                         {
 152                         HMAC_Final(&ctx,out,&j);
 153                         out+=j;
 154                         olen-=j;
 155                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 156                         }
 157                 else    /* last one */
 158                         {
 159                         HMAC_Final(&ctx,A1,&A1_len);
 160                         memcpy(out,A1,olen);
 161                         break;
 162                         }
 163                 }
 164         HMAC_CTX_cleanup(&ctx);
 165         HMAC_CTX_cleanup(&ctx_tmp);
 166         OPENSSL_cleanse(A1,sizeof(A1));
 167         }
 168
 169 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 170                      unsigned char *label, int label_len,
 171                      const unsigned char *sec, int slen, unsigned char *out1,
 172                      unsigned char *out2, int olen)
 173         {
 174         int len,i;
 175         const unsigned char *S1,*S2;
 176
 177         len=slen/2;
 178         S1=sec;
 179         S2= &(sec[len]);
 180         len+=(slen&1); /* add for odd, make longer */
 181
 182
 183         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 184         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 185
 186         for (i=0; i<olen; i++)
 187                 out1[i]^=out2[i];
 188         }
 189
 190 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 191              unsigned char *tmp, int num)
 192         {
 193         unsigned char *p;
 194         unsigned char buf[SSL3_RANDOM_SIZE*2+
 195                 TLS_MD_MAX_CONST_SIZE];
 196         p=buf;
 197
 198         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 199                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 200         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 201         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 202         p+=SSL3_RANDOM_SIZE;
 203         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 204         p+=SSL3_RANDOM_SIZE;
 205
 206         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 207                  s->session->master_key,s->session->master_key_length,
 208                  km,tmp,num);
 209 #ifdef KSSL_DEBUG
 210         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 211                 s->session->master_key_length);
 212         {
 213         int i;
 214         for (i=0; i < s->session->master_key_length; i++)
 215                 {
 216                 printf("%02X", s->session->master_key[i]);
 217                 }
 218         printf("\n");  }
 219 #endif    /* KSSL_DEBUG */
 220         }
 221
 222 int tls1_change_cipher_state(SSL *s, int which)
 223         {
 224         static const unsigned char empty[]="";
 225         unsigned char *p,*key_block,*mac_secret;
 226         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 227                 SSL3_RANDOM_SIZE*2];
 228         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 229         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 230         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 231         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 232         unsigned char *ms,*key,*iv,*er1,*er2;
 233         int client_write;
 234         EVP_CIPHER_CTX *dd;
 235         const EVP_CIPHER *c;
 236 #ifndef OPENSSL_NO_COMP
 237         const SSL_COMP *comp;
 238 #endif
 239         const EVP_MD *m;
 240         int is_export,n,i,j,k,exp_label_len,cl;
 241         int reuse_dd = 0;
 242
 243         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 244         c=s->s3->tmp.new_sym_enc;
 245         m=s->s3->tmp.new_hash;
 246 #ifndef OPENSSL_NO_COMP
 247         comp=s->s3->tmp.new_compression;
 248 #endif
 249         key_block=s->s3->tmp.key_block;
 250
 251 #ifdef KSSL_DEBUG
 252         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 253         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 254                 comp);
 255         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 256         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 257                 c->nid,c->block_size,c->key_len,c->iv_len);
 258         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 259         {
 260         int i;
 261         for (i=0; i<s->s3->tmp.key_block_length; i++)
 262                 printf("%02x", key_block[i]);  printf("\n");
 263         }
 264 #endif  /* KSSL_DEBUG */
 265
 266         if (which & SSL3_CC_READ)
 267                 {
 268                 if (s->enc_read_ctx != NULL)
 269                         reuse_dd = 1;
 270                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 271                         goto err;
 272                 else
 273                         /* make sure it's intialized in case we exit later with an error */
 274                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 275                 dd= s->enc_read_ctx;
 276                 s->read_hash=m;
 277 #ifndef OPENSSL_NO_COMP
 278                 if (s->expand != NULL)
 279                         {
 280                         COMP_CTX_free(s->expand);
 281                         s->expand=NULL;
 282                         }
 283                 if (comp != NULL)
 284                         {
 285                         s->expand=COMP_CTX_new(comp->method);
 286                         if (s->expand == NULL)
 287                                 {
 288                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 289                                 goto err2;
 290                                 }
 291                         if (s->s3->rrec.comp == NULL)
 292                                 s->s3->rrec.comp=(unsigned char *)
 293                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 294                         if (s->s3->rrec.comp == NULL)
 295                                 goto err;
 296                         }
 297 #endif
 298                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 299                 if (s->version != DTLS1_VERSION)
 300                         memset(&(s->s3->read_sequence[0]),0,8);
 301                 mac_secret= &(s->s3->read_mac_secret[0]);
 302                 }
 303         else
 304                 {
 305                 if (s->enc_write_ctx != NULL)
 306                         reuse_dd = 1;
 307                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 308                         goto err;
 309                 else
 310                         /* make sure it's intialized in case we exit later with an error */
 311                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 312                 dd= s->enc_write_ctx;
 313                 s->write_hash=m;
 314 #ifndef OPENSSL_NO_COMP
 315                 if (s->compress != NULL)
 316                         {
 317                         COMP_CTX_free(s->compress);
 318                         s->compress=NULL;
 319                         }
 320                 if (comp != NULL)
 321                         {
 322                         s->compress=COMP_CTX_new(comp->method);
 323                         if (s->compress == NULL)
 324                                 {
 325                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 326                                 goto err2;
 327                                 }
 328                         }
 329 #endif
 330                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 331                 if (s->version != DTLS1_VERSION)
 332                         memset(&(s->s3->write_sequence[0]),0,8);
 333                 mac_secret= &(s->s3->write_mac_secret[0]);
 334                 }
 335
 336         if (reuse_dd)
 337                 EVP_CIPHER_CTX_cleanup(dd);
 338
 339         p=s->s3->tmp.key_block;
 340         i=EVP_MD_size(m);
 341         cl=EVP_CIPHER_key_length(c);
 342         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 343                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 344         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 345         k=EVP_CIPHER_iv_length(c);
 346         er1= &(s->s3->client_random[0]);
 347         er2= &(s->s3->server_random[0]);
 348         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 349                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 350                 {
 351                 ms=  &(p[ 0]); n=i+i;
 352                 key= &(p[ n]); n+=j+j;
 353                 iv=  &(p[ n]); n+=k+k;
 354                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 355                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 356                 client_write=1;
 357                 }
 358         else
 359                 {
 360                 n=i;
 361                 ms=  &(p[ n]); n+=i+j;
 362                 key= &(p[ n]); n+=j+k;
 363                 iv=  &(p[ n]); n+=k;
 364                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 365                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 366                 client_write=0;
 367                 }
 368
 369         if (n > s->s3->tmp.key_block_length)
 370                 {
 371                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 372                 goto err2;
 373                 }
 374
 375         memcpy(mac_secret,ms,i);
 376 #ifdef TLS_DEBUG
 377 printf("which = %04X\nmac key=",which);
 378 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 379 #endif
 380         if (is_export)
 381                 {
 382                 /* In here I set both the read and write key/iv to the
 383                  * same value since only the correct one will be used :-).
 384                  */
 385                 p=buf;
 386                 memcpy(p,exp_label,exp_label_len);
 387                 p+=exp_label_len;
 388                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 389                 p+=SSL3_RANDOM_SIZE;
 390                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 391                 p+=SSL3_RANDOM_SIZE;
 392                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 393                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 394                 key=tmp1;
 395
 396                 if (k > 0)
 397                         {
 398                         p=buf;
 399                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 400                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 401                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 402                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 403                         p+=SSL3_RANDOM_SIZE;
 404                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 405                         p+=SSL3_RANDOM_SIZE;
 406                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 407                                  iv1,iv2,k*2);
 408                         if (client_write)
 409                                 iv=iv1;
 410                         else
 411                                 iv= &(iv1[k]);
 412                         }
 413                 }
 414
 415         s->session->key_arg_length=0;
 416 #ifdef KSSL_DEBUG
 417         {
 418         int i;
 419         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 420         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 421         printf("\n");
 422         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 423         printf("\n");
 424         }
 425 #endif  /* KSSL_DEBUG */
 426
 427         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 428 #ifdef TLS_DEBUG
 429 printf("which = %04X\nkey=",which);
 430 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 431 printf("\niv=");
 432 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 433 printf("\n");
 434 #endif
 435
 436         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 437         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 438         OPENSSL_cleanse(iv1,sizeof(iv1));
 439         OPENSSL_cleanse(iv2,sizeof(iv2));
 440         return(1);
 441 err:
 442         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 443 err2:
 444         return(0);
 445         }
 446
 447 int tls1_setup_key_block(SSL *s)
 448         {
 449         unsigned char *p1,*p2;
 450         const EVP_CIPHER *c;
 451         const EVP_MD *hash;
 452         int num;
 453         SSL_COMP *comp;
 454
 455 #ifdef KSSL_DEBUG
 456         printf ("tls1_setup_key_block()\n");
 457 #endif  /* KSSL_DEBUG */
 458
 459         if (s->s3->tmp.key_block_length != 0)
 460                 return(1);
 461
 462         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 463                 {
 464                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 465                 return(0);
 466                 }
 467
 468         s->s3->tmp.new_sym_enc=c;
 469         s->s3->tmp.new_hash=hash;
 470
 471         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 472         num*=2;
 473
 474         ssl3_cleanup_key_block(s);
 475
 476         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 477                 goto err;
 478         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 479                 goto err;
 480
 481         s->s3->tmp.key_block_length=num;
 482         s->s3->tmp.key_block=p1;
 483
 484
 485 #ifdef TLS_DEBUG
 486 printf("client random\n");
 487 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 488 printf("server random\n");
 489 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 490 printf("pre-master\n");
 491 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 492 #endif
 493         tls1_generate_key_block(s,p1,p2,num);
 494         OPENSSL_cleanse(p2,num);
 495         OPENSSL_free(p2);
 496 #ifdef TLS_DEBUG
 497 printf("\nkey block\n");
 498 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 499 #endif
 500
 501         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 502                 {
 503                 /* enable vulnerability countermeasure for CBC ciphers with
 504                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 505                  */
 506                 s->s3->need_empty_fragments = 1;
 507
 508                 if (s->session->cipher != NULL)
 509                         {
 510                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 511                                 s->s3->need_empty_fragments = 0;
 512
 513 #ifndef OPENSSL_NO_RC4
 514                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 515                                 s->s3->need_empty_fragments = 0;
 516 #endif
 517                         }
 518                 }
 519
 520         return(1);
 521 err:
 522         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 523         return(0);
 524         }
 525
 526 int tls1_enc(SSL *s, int send)
 527         {
 528         SSL3_RECORD *rec;
 529         EVP_CIPHER_CTX *ds;
 530         unsigned long l;
 531         int bs,i,ii,j,k,n=0;
 532         const EVP_CIPHER *enc;
 533
 534         if (send)
 535                 {
 536                 if (s->write_hash != NULL)
 537                         n=EVP_MD_size(s->write_hash);
 538                 ds=s->enc_write_ctx;
 539                 rec= &(s->s3->wrec);
 540                 if (s->enc_write_ctx == NULL)
 541                         enc=NULL;
 542                 else
 543                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 544                 }
 545         else
 546                 {
 547                 if (s->read_hash != NULL)
 548                         n=EVP_MD_size(s->read_hash);
 549                 ds=s->enc_read_ctx;
 550                 rec= &(s->s3->rrec);
 551                 if (s->enc_read_ctx == NULL)
 552                         enc=NULL;
 553                 else
 554                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 555                 }
 556
 557 #ifdef KSSL_DEBUG
 558         printf("tls1_enc(%d)\n", send);
 559 #endif    /* KSSL_DEBUG */
 560
 561         if ((s->session == NULL) || (ds == NULL) ||
 562                 (enc == NULL))
 563                 {
 564                 memmove(rec->data,rec->input,rec->length);
 565                 rec->input=rec->data;
 566                 }
 567         else
 568                 {
 569                 l=rec->length;
 570                 bs=EVP_CIPHER_block_size(ds->cipher);
 571
 572                 if ((bs != 1) && send)
 573                         {
 574                         i=bs-((int)l%bs);
 575
 576                         /* Add weird padding of upto 256 bytes */
 577
 578                         /* we need to add 'i' padding bytes of value j */
 579                         j=i-1;
 580                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 581                                 {
 582                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 583                                         j++;
 584                                 }
 585                         for (k=(int)l; k<(int)(l+i); k++)
 586                                 rec->input[k]=j;
 587                         l+=i;
 588                         rec->length+=i;
 589                         }
 590
 591 #ifdef KSSL_DEBUG
 592                 {
 593                 unsigned long ui;
 594                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 595                         ds,rec->data,rec->input,l);
 596                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 597                         ds->buf_len, ds->cipher->key_len,
 598                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 599                         ds->cipher->iv_len);
 600                 printf("\t\tIV: ");
 601                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 602                 printf("\n");
 603                 printf("\trec->input=");
 604                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 605                 printf("\n");
 606                 }
 607 #endif  /* KSSL_DEBUG */
 608
 609                 if (!send)
 610                         {
 611                         if (l == 0 || l%bs != 0)
 612                                 {
 613                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 614                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 615                                 return 0;
 616                                 }
 617                         }
 618
 619                 EVP_Cipher(ds,rec->data,rec->input,l);
 620
 621 #ifdef KSSL_DEBUG
 622                 {
 623                 unsigned long i;
 624                 printf("\trec->data=");
 625                 for (i=0; i<l; i++)
 626                         printf(" %02x", rec->data[i]);  printf("\n");
 627                 }
 628 #endif  /* KSSL_DEBUG */
 629
 630                 if ((bs != 1) && !send)
 631                         {
 632                         ii=i=rec->data[l-1]; /* padding_length */
 633                         i++;
 634                         /* NB: if compression is in operation the first packet
 635                          * may not be of even length so the padding bug check
 636                          * cannot be performed. This bug workaround has been
 637                          * around since SSLeay so hopefully it is either fixed
 638                          * now or no buggy implementation supports compression
 639                          * [steve]
 640                          */
 641                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 642                                 && !s->expand)
 643                                 {
 644                                 /* First packet is even in size, so check */
 645                                 if ((memcmp(s->s3->read_sequence,
 646                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 647                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 648                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 649                                         i--;
 650                                 }
 651                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 652                          * All of them must have value 'padding_length'. */
 653                         if (i > (int)rec->length)
 654                                 {
 655                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 656                                  * by caller: we don't want to reveal whether this is
 657                                  * a decryption error or a MAC verification failure
 658                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 659                                 return -1;
 660                                 }
 661                         for (j=(int)(l-i); j<(int)l; j++)
 662                                 {
 663                                 if (rec->data[j] != ii)
 664                                         {
 665                                         /* Incorrect padding */
 666                                         return -1;
 667                                         }
 668                                 }
 669                         rec->length-=i;
 670                         }
 671                 }
 672         return(1);
 673         }
 674
 675 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 676         {
 677         unsigned int ret;
 678         EVP_MD_CTX ctx;
 679
 680         EVP_MD_CTX_init(&ctx);
 681         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 682         EVP_DigestFinal_ex(&ctx,out,&ret);
 683         EVP_MD_CTX_cleanup(&ctx);
 684         return((int)ret);
 685         }
 686
 687 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 688              const char *str, int slen, unsigned char *out)
 689         {
 690         unsigned int i;
 691         EVP_MD_CTX ctx;
 692         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 693         unsigned char *q,buf2[12];
 694
 695         q=buf;
 696         memcpy(q,str,slen);
 697         q+=slen;
 698
 699         EVP_MD_CTX_init(&ctx);
 700         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 701         EVP_DigestFinal_ex(&ctx,q,&i);
 702         q+=i;
 703         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 704         EVP_DigestFinal_ex(&ctx,q,&i);
 705         q+=i;
 706
 707         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 708                 s->session->master_key,s->session->master_key_length,
 709                 out,buf2,sizeof buf2);
 710         EVP_MD_CTX_cleanup(&ctx);
 711
 712         return sizeof buf2;
 713         }
 714
 715 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 716         {
 717         SSL3_RECORD *rec;
 718         unsigned char *mac_sec,*seq;
 719         const EVP_MD *hash;
 720         unsigned int md_size;
 721         int i;
 722         HMAC_CTX hmac;
 723         unsigned char buf[5];
 724
 725         if (send)
 726                 {
 727                 rec= &(ssl->s3->wrec);
 728                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 729                 seq= &(ssl->s3->write_sequence[0]);
 730                 hash=ssl->write_hash;
 731                 }
 732         else
 733                 {
 734                 rec= &(ssl->s3->rrec);
 735                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 736                 seq= &(ssl->s3->read_sequence[0]);
 737                 hash=ssl->read_hash;
 738                 }
 739
 740         md_size=EVP_MD_size(hash);
 741
 742         buf[0]=rec->type;
 743         if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER)
 744                 {
 745                 buf[1]=TLS1_VERSION_MAJOR;
 746                 buf[2]=TLS1_VERSION_MINOR;
 747                 }
 748         else    {
 749                 buf[1]=(unsigned char)(ssl->version>>8);
 750                 buf[2]=(unsigned char)(ssl->version);
 751                 }
 752
 753         buf[3]=rec->length>>8;
 754         buf[4]=rec->length&0xff;
 755
 756         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 757         HMAC_CTX_init(&hmac);
 758         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 759
 760         if (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER)
 761                 {
 762                 unsigned char dtlsseq[8],*p=dtlsseq;
 763
 764                 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
 765                 memcpy (p,&seq[2],6);
 766
 767                 HMAC_Update(&hmac,dtlsseq,8);
 768                 }
 769         else
 770                 HMAC_Update(&hmac,seq,8);
 771
 772         HMAC_Update(&hmac,buf,5);
 773         HMAC_Update(&hmac,rec->input,rec->length);
 774         HMAC_Final(&hmac,md,&md_size);
 775         HMAC_CTX_cleanup(&hmac);
 776
 777 #ifdef TLS_DEBUG
 778 printf("sec=");
 779 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 780 printf("seq=");
 781 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 782 printf("buf=");
 783 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 784 printf("rec=");
 785 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 786 #endif
 787
 788         if ( SSL_version(ssl) != DTLS1_VERSION)
 789                 {
 790                 for (i=7; i>=0; i--)
 791                         {
 792                         ++seq[i];
 793                         if (seq[i] != 0) break;
 794                         }
 795                 }
 796
 797 #ifdef TLS_DEBUG
 798 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 799 #endif
 800         return(md_size);
 801         }
 802
 803 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 804              int len)
 805         {
 806         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 807         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 808
 809 #ifdef KSSL_DEBUG
 810         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 811 #endif  /* KSSL_DEBUG */
 812
 813         /* Setup the stuff to munge */
 814         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 815                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 816         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 817                 s->s3->client_random,SSL3_RANDOM_SIZE);
 818         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 819                 s->s3->server_random,SSL3_RANDOM_SIZE);
 820         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 821                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 822                 s->session->master_key,buff,sizeof buff);
 823 #ifdef KSSL_DEBUG
 824         printf ("tls1_generate_master_secret() complete\n");
 825 #endif  /* KSSL_DEBUG */
 826         return(SSL3_MASTER_SECRET_SIZE);
 827         }
 828
 829 int tls1_alert_code(int code)
 830         {
 831         switch (code)
 832                 {
 833         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 834         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 835         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 836         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 837         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 838         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 839         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 840         case SSL_AD_NO_CERTIFICATE:     return(-1);
 841         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 842         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 843         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 844         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 845         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 846         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 847         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 848         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 849         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 850         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 851         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 852         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 853         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 854         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 855         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 856         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 857         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 858                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 859         default:                        return(-1);
 860                 }
 861         }
 862