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 #ifndef OPENSSL_NO_COMP
 235         const SSL_COMP *comp;
 236 #endif
 237         const EVP_MD *m;
 238         int is_export,n,i,j,k,exp_label_len,cl;
 239         int reuse_dd = 0;
 240
 241         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 242         c=s->s3->tmp.new_sym_enc;
 243         m=s->s3->tmp.new_hash;
 244 #ifndef OPENSSL_NO_COMP
 245         comp=s->s3->tmp.new_compression;
 246 #endif
 247         key_block=s->s3->tmp.key_block;
 248
 249 #ifdef KSSL_DEBUG
 250         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 251         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 252                 comp);
 253         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 254         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 255                 c->nid,c->block_size,c->key_len,c->iv_len);
 256         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 257         {
 258         int i;
 259         for (i=0; i<s->s3->tmp.key_block_length; i++)
 260                 printf("%02x", key_block[i]);  printf("\n");
 261         }
 262 #endif  /* KSSL_DEBUG */
 263
 264         if (which & SSL3_CC_READ)
 265                 {
 266                 if (s->enc_read_ctx != NULL)
 267                         reuse_dd = 1;
 268                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 269                         goto err;
 270                 dd= s->enc_read_ctx;
 271                 s->read_hash=m;
 272 #ifndef OPENSSL_NO_COMP
 273                 if (s->expand != NULL)
 274                         {
 275                         COMP_CTX_free(s->expand);
 276                         s->expand=NULL;
 277                         }
 278                 if (comp != NULL)
 279                         {
 280                         s->expand=COMP_CTX_new(comp->method);
 281                         if (s->expand == NULL)
 282                                 {
 283                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 284                                 goto err2;
 285                                 }
 286                         if (s->s3->rrec.comp == NULL)
 287                                 s->s3->rrec.comp=(unsigned char *)
 288                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 289                         if (s->s3->rrec.comp == NULL)
 290                                 goto err;
 291                         }
 292 #endif
 293                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 294                 if (s->version != DTLS1_VERSION)
 295                         memset(&(s->s3->read_sequence[0]),0,8);
 296                 mac_secret= &(s->s3->read_mac_secret[0]);
 297                 }
 298         else
 299                 {
 300                 if (s->enc_write_ctx != NULL)
 301                         reuse_dd = 1;
 302                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 303                         goto err;
 304                 if ((s->enc_write_ctx == NULL) &&
 305                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 306                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 307                         goto err;
 308                 dd= s->enc_write_ctx;
 309                 s->write_hash=m;
 310 #ifndef OPENSSL_NO_COMP
 311                 if (s->compress != NULL)
 312                         {
 313                         COMP_CTX_free(s->compress);
 314                         s->compress=NULL;
 315                         }
 316                 if (comp != NULL)
 317                         {
 318                         s->compress=COMP_CTX_new(comp->method);
 319                         if (s->compress == NULL)
 320                                 {
 321                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 322                                 goto err2;
 323                                 }
 324                         }
 325 #endif
 326                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 327                 if (s->version != DTLS1_VERSION)
 328                         memset(&(s->s3->write_sequence[0]),0,8);
 329                 mac_secret= &(s->s3->write_mac_secret[0]);
 330                 }
 331
 332         if (reuse_dd)
 333                 EVP_CIPHER_CTX_cleanup(dd);
 334         EVP_CIPHER_CTX_init(dd);
 335
 336         p=s->s3->tmp.key_block;
 337         i=EVP_MD_size(m);
 338         cl=EVP_CIPHER_key_length(c);
 339         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 340                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 341         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 342         k=EVP_CIPHER_iv_length(c);
 343         er1= &(s->s3->client_random[0]);
 344         er2= &(s->s3->server_random[0]);
 345         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 346                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 347                 {
 348                 ms=  &(p[ 0]); n=i+i;
 349                 key= &(p[ n]); n+=j+j;
 350                 iv=  &(p[ n]); n+=k+k;
 351                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 352                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 353                 client_write=1;
 354                 }
 355         else
 356                 {
 357                 n=i;
 358                 ms=  &(p[ n]); n+=i+j;
 359                 key= &(p[ n]); n+=j+k;
 360                 iv=  &(p[ n]); n+=k;
 361                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 362                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 363                 client_write=0;
 364                 }
 365
 366         if (n > s->s3->tmp.key_block_length)
 367                 {
 368                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 369                 goto err2;
 370                 }
 371
 372         memcpy(mac_secret,ms,i);
 373 #ifdef TLS_DEBUG
 374 printf("which = %04X\nmac key=",which);
 375 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 376 #endif
 377         if (is_export)
 378                 {
 379                 /* In here I set both the read and write key/iv to the
 380                  * same value since only the correct one will be used :-).
 381                  */
 382                 p=buf;
 383                 memcpy(p,exp_label,exp_label_len);
 384                 p+=exp_label_len;
 385                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 386                 p+=SSL3_RANDOM_SIZE;
 387                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 388                 p+=SSL3_RANDOM_SIZE;
 389                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 390                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 391                 key=tmp1;
 392
 393                 if (k > 0)
 394                         {
 395                         p=buf;
 396                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 397                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 398                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 399                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 400                         p+=SSL3_RANDOM_SIZE;
 401                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 402                         p+=SSL3_RANDOM_SIZE;
 403                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 404                                  iv1,iv2,k*2);
 405                         if (client_write)
 406                                 iv=iv1;
 407                         else
 408                                 iv= &(iv1[k]);
 409                         }
 410                 }
 411
 412         s->session->key_arg_length=0;
 413 #ifdef KSSL_DEBUG
 414         {
 415         int i;
 416         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 417         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 418         printf("\n");
 419         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 420         printf("\n");
 421         }
 422 #endif  /* KSSL_DEBUG */
 423
 424         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 425 #ifdef TLS_DEBUG
 426 printf("which = %04X\nkey=",which);
 427 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 428 printf("\niv=");
 429 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 430 printf("\n");
 431 #endif
 432
 433         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 434         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 435         OPENSSL_cleanse(iv1,sizeof(iv1));
 436         OPENSSL_cleanse(iv2,sizeof(iv2));
 437         return(1);
 438 err:
 439         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 440 err2:
 441         return(0);
 442         }
 443
 444 int tls1_setup_key_block(SSL *s)
 445         {
 446         unsigned char *p1,*p2;
 447         const EVP_CIPHER *c;
 448         const EVP_MD *hash;
 449         int num;
 450         SSL_COMP *comp;
 451
 452 #ifdef KSSL_DEBUG
 453         printf ("tls1_setup_key_block()\n");
 454 #endif  /* KSSL_DEBUG */
 455
 456         if (s->s3->tmp.key_block_length != 0)
 457                 return(1);
 458
 459         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 460                 {
 461                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 462                 return(0);
 463                 }
 464
 465         s->s3->tmp.new_sym_enc=c;
 466         s->s3->tmp.new_hash=hash;
 467
 468         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 469         num*=2;
 470
 471         ssl3_cleanup_key_block(s);
 472
 473         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 474                 goto err;
 475         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 476                 goto err;
 477
 478         s->s3->tmp.key_block_length=num;
 479         s->s3->tmp.key_block=p1;
 480
 481
 482 #ifdef TLS_DEBUG
 483 printf("client random\n");
 484 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 485 printf("server random\n");
 486 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 487 printf("pre-master\n");
 488 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 489 #endif
 490         tls1_generate_key_block(s,p1,p2,num);
 491         OPENSSL_cleanse(p2,num);
 492         OPENSSL_free(p2);
 493 #ifdef TLS_DEBUG
 494 printf("\nkey block\n");
 495 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 496 #endif
 497
 498         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 499                 {
 500                 /* enable vulnerability countermeasure for CBC ciphers with
 501                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 502                  */
 503                 s->s3->need_empty_fragments = 1;
 504
 505                 if (s->session->cipher != NULL)
 506                         {
 507                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 508                                 s->s3->need_empty_fragments = 0;
 509
 510 #ifndef OPENSSL_NO_RC4
 511                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 512                                 s->s3->need_empty_fragments = 0;
 513 #endif
 514                         }
 515                 }
 516
 517         return(1);
 518 err:
 519         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 520         return(0);
 521         }
 522
 523 int tls1_enc(SSL *s, int send)
 524         {
 525         SSL3_RECORD *rec;
 526         EVP_CIPHER_CTX *ds;
 527         unsigned long l;
 528         int bs,i,ii,j,k,n=0;
 529         const EVP_CIPHER *enc;
 530
 531         if (send)
 532                 {
 533                 if (s->write_hash != NULL)
 534                         n=EVP_MD_size(s->write_hash);
 535                 ds=s->enc_write_ctx;
 536                 rec= &(s->s3->wrec);
 537                 if (s->enc_write_ctx == NULL)
 538                         enc=NULL;
 539                 else
 540                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 541                 }
 542         else
 543                 {
 544                 if (s->read_hash != NULL)
 545                         n=EVP_MD_size(s->read_hash);
 546                 ds=s->enc_read_ctx;
 547                 rec= &(s->s3->rrec);
 548                 if (s->enc_read_ctx == NULL)
 549                         enc=NULL;
 550                 else
 551                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 552                 }
 553
 554 #ifdef KSSL_DEBUG
 555         printf("tls1_enc(%d)\n", send);
 556 #endif    /* KSSL_DEBUG */
 557
 558         if ((s->session == NULL) || (ds == NULL) ||
 559                 (enc == NULL))
 560                 {
 561                 memmove(rec->data,rec->input,rec->length);
 562                 rec->input=rec->data;
 563                 }
 564         else
 565                 {
 566                 l=rec->length;
 567                 bs=EVP_CIPHER_block_size(ds->cipher);
 568
 569                 if ((bs != 1) && send)
 570                         {
 571                         i=bs-((int)l%bs);
 572
 573                         /* Add weird padding of upto 256 bytes */
 574
 575                         /* we need to add 'i' padding bytes of value j */
 576                         j=i-1;
 577                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 578                                 {
 579                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 580                                         j++;
 581                                 }
 582                         for (k=(int)l; k<(int)(l+i); k++)
 583                                 rec->input[k]=j;
 584                         l+=i;
 585                         rec->length+=i;
 586                         }
 587
 588 #ifdef KSSL_DEBUG
 589                 {
 590                 unsigned long ui;
 591                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 592                         ds,rec->data,rec->input,l);
 593                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 594                         ds->buf_len, ds->cipher->key_len,
 595                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 596                         ds->cipher->iv_len);
 597                 printf("\t\tIV: ");
 598                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 599                 printf("\n");
 600                 printf("\trec->input=");
 601                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 602                 printf("\n");
 603                 }
 604 #endif  /* KSSL_DEBUG */
 605
 606                 if (!send)
 607                         {
 608                         if (l == 0 || l%bs != 0)
 609                                 {
 610                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 611                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 612                                 return 0;
 613                                 }
 614                         }
 615
 616                 EVP_Cipher(ds,rec->data,rec->input,l);
 617
 618 #ifdef KSSL_DEBUG
 619                 {
 620                 unsigned long i;
 621                 printf("\trec->data=");
 622                 for (i=0; i<l; i++)
 623                         printf(" %02x", rec->data[i]);  printf("\n");
 624                 }
 625 #endif  /* KSSL_DEBUG */
 626
 627                 if ((bs != 1) && !send)
 628                         {
 629                         ii=i=rec->data[l-1]; /* padding_length */
 630                         i++;
 631                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 632                                 {
 633                                 /* First packet is even in size, so check */
 634                                 if ((memcmp(s->s3->read_sequence,
 635                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 636                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 637                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 638                                         i--;
 639                                 }
 640                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 641                          * All of them must have value 'padding_length'. */
 642                         if (i > (int)rec->length)
 643                                 {
 644                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 645                                  * by caller: we don't want to reveal whether this is
 646                                  * a decryption error or a MAC verification failure
 647                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 648                                 return -1;
 649                                 }
 650                         for (j=(int)(l-i); j<(int)l; j++)
 651                                 {
 652                                 if (rec->data[j] != ii)
 653                                         {
 654                                         /* Incorrect padding */
 655                                         return -1;
 656                                         }
 657                                 }
 658                         rec->length-=i;
 659                         }
 660                 }
 661         return(1);
 662         }
 663
 664 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 665         {
 666         unsigned int ret;
 667         EVP_MD_CTX ctx;
 668
 669         EVP_MD_CTX_init(&ctx);
 670         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 671         EVP_DigestFinal_ex(&ctx,out,&ret);
 672         EVP_MD_CTX_cleanup(&ctx);
 673         return((int)ret);
 674         }
 675
 676 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 677              const char *str, int slen, unsigned char *out)
 678         {
 679         unsigned int i;
 680         EVP_MD_CTX ctx;
 681         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 682         unsigned char *q,buf2[12];
 683
 684         q=buf;
 685         memcpy(q,str,slen);
 686         q+=slen;
 687
 688         EVP_MD_CTX_init(&ctx);
 689         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 690         EVP_DigestFinal_ex(&ctx,q,&i);
 691         q+=i;
 692         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 693         EVP_DigestFinal_ex(&ctx,q,&i);
 694         q+=i;
 695
 696         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 697                 s->session->master_key,s->session->master_key_length,
 698                 out,buf2,sizeof buf2);
 699         EVP_MD_CTX_cleanup(&ctx);
 700
 701         return sizeof buf2;
 702         }
 703
 704 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 705         {
 706         SSL3_RECORD *rec;
 707         unsigned char *mac_sec,*seq;
 708         const EVP_MD *hash;
 709         unsigned int md_size;
 710         int i;
 711         HMAC_CTX hmac;
 712         unsigned char buf[5];
 713
 714         if (send)
 715                 {
 716                 rec= &(ssl->s3->wrec);
 717                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 718                 seq= &(ssl->s3->write_sequence[0]);
 719                 hash=ssl->write_hash;
 720                 }
 721         else
 722                 {
 723                 rec= &(ssl->s3->rrec);
 724                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 725                 seq= &(ssl->s3->read_sequence[0]);
 726                 hash=ssl->read_hash;
 727                 }
 728
 729         md_size=EVP_MD_size(hash);
 730
 731         buf[0]=rec->type;
 732         buf[1]=TLS1_VERSION_MAJOR;
 733         buf[2]=TLS1_VERSION_MINOR;
 734         buf[3]=rec->length>>8;
 735         buf[4]=rec->length&0xff;
 736
 737         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 738         HMAC_CTX_init(&hmac);
 739         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 740         HMAC_Update(&hmac,seq,8);
 741         HMAC_Update(&hmac,buf,5);
 742         HMAC_Update(&hmac,rec->input,rec->length);
 743         HMAC_Final(&hmac,md,&md_size);
 744         HMAC_CTX_cleanup(&hmac);
 745
 746 #ifdef TLS_DEBUG
 747 printf("sec=");
 748 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 749 printf("seq=");
 750 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 751 printf("buf=");
 752 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 753 printf("rec=");
 754 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 755 #endif
 756
 757     if ( SSL_version(ssl) != DTLS1_VERSION)
 758             {
 759                 for (i=7; i>=0; i--)
 760                         {
 761                         ++seq[i];
 762                         if (seq[i] != 0) break;
 763                         }
 764                 }
 765
 766 #ifdef TLS_DEBUG
 767 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 768 #endif
 769         return(md_size);
 770         }
 771
 772 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 773              int len)
 774         {
 775         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 776         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 777
 778 #ifdef KSSL_DEBUG
 779         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 780 #endif  /* KSSL_DEBUG */
 781
 782         /* Setup the stuff to munge */
 783         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 784                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 785         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 786                 s->s3->client_random,SSL3_RANDOM_SIZE);
 787         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 788                 s->s3->server_random,SSL3_RANDOM_SIZE);
 789         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 790                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 791                 s->session->master_key,buff,sizeof buff);
 792 #ifdef KSSL_DEBUG
 793         printf ("tls1_generate_master_secret() complete\n");
 794 #endif  /* KSSL_DEBUG */
 795         return(SSL3_MASTER_SECRET_SIZE);
 796         }
 797
 798 int tls1_alert_code(int code)
 799         {
 800         switch (code)
 801                 {
 802         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 803         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 804         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 805         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 806         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 807         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 808         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 809         case SSL_AD_NO_CERTIFICATE:     return(-1);
 810         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 811         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 812         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 813         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 814         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 815         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 816         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 817         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 818         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 819         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 820         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 821         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 822         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 823         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 824         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 825         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 826         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
 827         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 828                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 829         default:                        return(-1);
 830                 }
 831         }
 832