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 #ifndef OPENSSL_NO_COMP
 115 #include <openssl/comp.h>
 116 #endif
 117 #include <openssl/evp.h>
 118 #include <openssl/hmac.h>
 119 #include <openssl/md5.h>
 120 #ifdef KSSL_DEBUG
 121 #include <openssl/des.h>
 122 #endif
 123
 124 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 125                         int sec_len, unsigned char *seed, int seed_len,
 126                         unsigned char *out, int olen)
 127         {
 128         int chunk;
 129         unsigned int j;
 130         HMAC_CTX ctx;
 131         HMAC_CTX ctx_tmp;
 132         unsigned char A1[EVP_MAX_MD_SIZE];
 133         unsigned int A1_len;
 134
 135         chunk=EVP_MD_size(md);
 136
 137         HMAC_CTX_init(&ctx);
 138         HMAC_CTX_init(&ctx_tmp);
 139         HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 140         HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 141         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 142         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 143         HMAC_Update(&ctx,seed,seed_len);
 144         HMAC_Final(&ctx,A1,&A1_len);
 145
 146         for (;;)
 147                 {
 148                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 149                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 150                 HMAC_Update(&ctx,A1,A1_len);
 151                 HMAC_Update(&ctx_tmp,A1,A1_len);
 152                 HMAC_Update(&ctx,seed,seed_len);
 153
 154                 if (olen > chunk)
 155                         {
 156                         HMAC_Final(&ctx,out,&j);
 157                         out+=j;
 158                         olen-=j;
 159                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 160                         }
 161                 else    /* last one */
 162                         {
 163                         HMAC_Final(&ctx,A1,&A1_len);
 164                         memcpy(out,A1,olen);
 165                         break;
 166                         }
 167                 }
 168         HMAC_CTX_cleanup(&ctx);
 169         HMAC_CTX_cleanup(&ctx_tmp);
 170         OPENSSL_cleanse(A1,sizeof(A1));
 171         }
 172
 173 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 174                      unsigned char *label, int label_len,
 175                      const unsigned char *sec, int slen, unsigned char *out1,
 176                      unsigned char *out2, int olen)
 177         {
 178         int len,i;
 179         const unsigned char *S1,*S2;
 180
 181         len=slen/2;
 182         S1=sec;
 183         S2= &(sec[len]);
 184         len+=(slen&1); /* add for odd, make longer */
 185
 186
 187         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 188         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 189
 190         for (i=0; i<olen; i++)
 191                 out1[i]^=out2[i];
 192         }
 193
 194 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 195              unsigned char *tmp, int num)
 196         {
 197         unsigned char *p;
 198         unsigned char buf[SSL3_RANDOM_SIZE*2+
 199                 TLS_MD_MAX_CONST_SIZE];
 200         p=buf;
 201
 202         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 203                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 204         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 205         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 206         p+=SSL3_RANDOM_SIZE;
 207         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 208         p+=SSL3_RANDOM_SIZE;
 209
 210         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 211                  s->session->master_key,s->session->master_key_length,
 212                  km,tmp,num);
 213 #ifdef KSSL_DEBUG
 214         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 215                 s->session->master_key_length);
 216         {
 217         int i;
 218         for (i=0; i < s->session->master_key_length; i++)
 219                 {
 220                 printf("%02X", s->session->master_key[i]);
 221                 }
 222         printf("\n");  }
 223 #endif    /* KSSL_DEBUG */
 224         }
 225
 226 int tls1_change_cipher_state(SSL *s, int which)
 227         {
 228         static const unsigned char empty[]="";
 229         unsigned char *p,*mac_secret;
 230         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 231                 SSL3_RANDOM_SIZE*2];
 232         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 233         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 234         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 235         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 236         unsigned char *ms,*key,*iv;
 237         int client_write;
 238         EVP_CIPHER_CTX *dd;
 239         const EVP_CIPHER *c;
 240 #ifndef OPENSSL_NO_COMP
 241         const SSL_COMP *comp;
 242 #endif
 243         const EVP_MD *m;
 244         int is_export,n,i,j,k,exp_label_len,cl;
 245         int reuse_dd = 0;
 246
 247         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 248         c=s->s3->tmp.new_sym_enc;
 249         m=s->s3->tmp.new_hash;
 250 #ifndef OPENSSL_NO_COMP
 251         comp=s->s3->tmp.new_compression;
 252 #endif
 253
 254 #ifdef KSSL_DEBUG
 255         key_block=s->s3->tmp.key_block;
 256
 257         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 258         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
 259                 (void *)comp);
 260         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c);
 261         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 262                 c->nid,c->block_size,c->key_len,c->iv_len);
 263         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 264         {
 265         int ki;
 266         for (ki=0; ki<s->s3->tmp.key_block_length; ki++)
 267                 printf("%02x", s->s3->tmp.key_block[ki]);  printf("\n");
 268         }
 269 #endif  /* KSSL_DEBUG */
 270
 271         if (which & SSL3_CC_READ)
 272                 {
 273                 if (s->enc_read_ctx != NULL)
 274                         reuse_dd = 1;
 275                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 276                         goto err;
 277                 else
 278                         /* make sure it's intialized in case we exit later with an error */
 279                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 280                 dd= s->enc_read_ctx;
 281                 s->read_hash=m;
 282 #ifndef OPENSSL_NO_COMP
 283                 if (s->expand != NULL)
 284                         {
 285                         COMP_CTX_free(s->expand);
 286                         s->expand=NULL;
 287                         }
 288                 if (comp != NULL)
 289                         {
 290                         s->expand=COMP_CTX_new(comp->method);
 291                         if (s->expand == NULL)
 292                                 {
 293                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 294                                 goto err2;
 295                                 }
 296                         if (s->s3->rrec.comp == NULL)
 297                                 s->s3->rrec.comp=(unsigned char *)
 298                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 299                         if (s->s3->rrec.comp == NULL)
 300                                 goto err;
 301                         }
 302 #endif
 303                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 304                 if (s->version != DTLS1_VERSION)
 305                         memset(&(s->s3->read_sequence[0]),0,8);
 306                 mac_secret= &(s->s3->read_mac_secret[0]);
 307                 }
 308         else
 309                 {
 310                 if (s->enc_write_ctx != NULL)
 311                         reuse_dd = 1;
 312                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 313                         goto err;
 314                 else
 315                         /* make sure it's intialized in case we exit later with an error */
 316                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 317                 dd= s->enc_write_ctx;
 318                 s->write_hash=m;
 319 #ifndef OPENSSL_NO_COMP
 320                 if (s->compress != NULL)
 321                         {
 322                         COMP_CTX_free(s->compress);
 323                         s->compress=NULL;
 324                         }
 325                 if (comp != NULL)
 326                         {
 327                         s->compress=COMP_CTX_new(comp->method);
 328                         if (s->compress == NULL)
 329                                 {
 330                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 331                                 goto err2;
 332                                 }
 333                         }
 334 #endif
 335                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 336                 if (s->version != DTLS1_VERSION)
 337                         memset(&(s->s3->write_sequence[0]),0,8);
 338                 mac_secret= &(s->s3->write_mac_secret[0]);
 339                 }
 340
 341         if (reuse_dd)
 342                 EVP_CIPHER_CTX_cleanup(dd);
 343
 344         p=s->s3->tmp.key_block;
 345         i=EVP_MD_size(m);
 346         cl=EVP_CIPHER_key_length(c);
 347         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 348                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 349         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 350         k=EVP_CIPHER_iv_length(c);
 351         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 352                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 353                 {
 354                 ms=  &(p[ 0]); n=i+i;
 355                 key= &(p[ n]); n+=j+j;
 356                 iv=  &(p[ n]); n+=k+k;
 357                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 358                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 359                 client_write=1;
 360                 }
 361         else
 362                 {
 363                 n=i;
 364                 ms=  &(p[ n]); n+=i+j;
 365                 key= &(p[ n]); n+=j+k;
 366                 iv=  &(p[ n]); n+=k;
 367                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 368                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 369                 client_write=0;
 370                 }
 371
 372         if (n > s->s3->tmp.key_block_length)
 373                 {
 374                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 375                 goto err2;
 376                 }
 377
 378         memcpy(mac_secret,ms,i);
 379 #ifdef TLS_DEBUG
 380 printf("which = %04X\nmac key=",which);
 381 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 382 #endif
 383         if (is_export)
 384                 {
 385                 /* In here I set both the read and write key/iv to the
 386                  * same value since only the correct one will be used :-).
 387                  */
 388                 p=buf;
 389                 memcpy(p,exp_label,exp_label_len);
 390                 p+=exp_label_len;
 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,(int)(p-buf),key,j,
 396                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 397                 key=tmp1;
 398
 399                 if (k > 0)
 400                         {
 401                         p=buf;
 402                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 403                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 404                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 405                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 406                         p+=SSL3_RANDOM_SIZE;
 407                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 408                         p+=SSL3_RANDOM_SIZE;
 409                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 410                                  iv1,iv2,k*2);
 411                         if (client_write)
 412                                 iv=iv1;
 413                         else
 414                                 iv= &(iv1[k]);
 415                         }
 416                 }
 417
 418         s->session->key_arg_length=0;
 419 #ifdef KSSL_DEBUG
 420         {
 421         int ki;
 422         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 423         printf("\tkey= ");
 424         for (ki=0; ki<c->key_len; ki++) printf("%02x", key[ki]);
 425         printf("\n");
 426         printf("\t iv= ");
 427         for (ki=0; ki<c->iv_len; ki++) printf("%02x", iv[ki]);
 428         printf("\n");
 429         }
 430 #endif  /* KSSL_DEBUG */
 431
 432         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 433 #ifdef TLS_DEBUG
 434 printf("which = %04X\nkey=",which);
 435 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 436 printf("\niv=");
 437 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 438 printf("\n");
 439 #endif
 440
 441         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 442         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 443         OPENSSL_cleanse(iv1,sizeof(iv1));
 444         OPENSSL_cleanse(iv2,sizeof(iv2));
 445         return(1);
 446 err:
 447         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 448 err2:
 449         return(0);
 450         }
 451
 452 int tls1_setup_key_block(SSL *s)
 453         {
 454         unsigned char *p1,*p2;
 455         const EVP_CIPHER *c;
 456         const EVP_MD *hash;
 457         int num;
 458         SSL_COMP *comp;
 459
 460 #ifdef KSSL_DEBUG
 461         printf ("tls1_setup_key_block()\n");
 462 #endif  /* KSSL_DEBUG */
 463
 464         if (s->s3->tmp.key_block_length != 0)
 465                 return(1);
 466
 467         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 468                 {
 469                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 470                 return(0);
 471                 }
 472
 473         s->s3->tmp.new_sym_enc=c;
 474         s->s3->tmp.new_hash=hash;
 475
 476         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 477         num*=2;
 478
 479         ssl3_cleanup_key_block(s);
 480
 481         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 482                 goto err;
 483         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 484                 goto err;
 485
 486         s->s3->tmp.key_block_length=num;
 487         s->s3->tmp.key_block=p1;
 488
 489
 490 #ifdef TLS_DEBUG
 491 printf("client random\n");
 492 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 493 printf("server random\n");
 494 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 495 printf("pre-master\n");
 496 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 497 #endif
 498         tls1_generate_key_block(s,p1,p2,num);
 499         OPENSSL_cleanse(p2,num);
 500         OPENSSL_free(p2);
 501 #ifdef TLS_DEBUG
 502 printf("\nkey block\n");
 503 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 504 #endif
 505
 506         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 507                 {
 508                 /* enable vulnerability countermeasure for CBC ciphers with
 509                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 510                  */
 511                 s->s3->need_empty_fragments = 1;
 512
 513                 if (s->session->cipher != NULL)
 514                         {
 515                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 516                                 s->s3->need_empty_fragments = 0;
 517
 518 #ifndef OPENSSL_NO_RC4
 519                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 520                                 s->s3->need_empty_fragments = 0;
 521 #endif
 522                         }
 523                 }
 524
 525         return(1);
 526 err:
 527         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 528         return(0);
 529         }
 530
 531 int tls1_enc(SSL *s, int send)
 532         {
 533         SSL3_RECORD *rec;
 534         EVP_CIPHER_CTX *ds;
 535         unsigned long l;
 536         int bs,i,ii,j,k;
 537         const EVP_CIPHER *enc;
 538
 539         if (send)
 540                 {
 541                 ds=s->enc_write_ctx;
 542                 rec= &(s->s3->wrec);
 543                 if (s->enc_write_ctx == NULL)
 544                         enc=NULL;
 545                 else
 546                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 547                 }
 548         else
 549                 {
 550                 ds=s->enc_read_ctx;
 551                 rec= &(s->s3->rrec);
 552                 if (s->enc_read_ctx == NULL)
 553                         enc=NULL;
 554                 else
 555                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 556                 }
 557
 558 #ifdef KSSL_DEBUG
 559         printf("tls1_enc(%d)\n", send);
 560 #endif    /* KSSL_DEBUG */
 561
 562         if ((s->session == NULL) || (ds == NULL) ||
 563                 (enc == NULL))
 564                 {
 565                 memmove(rec->data,rec->input,rec->length);
 566                 rec->input=rec->data;
 567                 }
 568         else
 569                 {
 570                 l=rec->length;
 571                 bs=EVP_CIPHER_block_size(ds->cipher);
 572
 573                 if ((bs != 1) && send)
 574                         {
 575                         i=bs-((int)l%bs);
 576
 577                         /* Add weird padding of upto 256 bytes */
 578
 579                         /* we need to add 'i' padding bytes of value j */
 580                         j=i-1;
 581                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 582                                 {
 583                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 584                                         j++;
 585                                 }
 586                         for (k=(int)l; k<(int)(l+i); k++)
 587                                 rec->input[k]=j;
 588                         l+=i;
 589                         rec->length+=i;
 590                         }
 591
 592 #ifdef KSSL_DEBUG
 593                 {
 594                 unsigned long ui;
 595                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 596                         (void *)ds,rec->data,rec->input,l);
 597                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%ld %ld], %d iv_len\n",
 598                         ds->buf_len, ds->cipher->key_len,
 599                         (unsigned long)DES_KEY_SZ,
 600                         (unsigned long)DES_SCHEDULE_SZ,
 601                         ds->cipher->iv_len);
 602                 printf("\t\tIV: ");
 603                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 604                 printf("\n");
 605                 printf("\trec->input=");
 606                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 607                 printf("\n");
 608                 }
 609 #endif  /* KSSL_DEBUG */
 610
 611                 if (!send)
 612                         {
 613                         if (l == 0 || l%bs != 0)
 614                                 {
 615                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 616                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 617                                 return 0;
 618                                 }
 619                         }
 620
 621                 EVP_Cipher(ds,rec->data,rec->input,l);
 622
 623 #ifdef KSSL_DEBUG
 624                 {
 625                 unsigned long ki;
 626                 printf("\trec->data=");
 627                 for (ki=0; ki<l; i++)
 628                         printf(" %02x", rec->data[ki]);  printf("\n");
 629                 }
 630 #endif  /* KSSL_DEBUG */
 631
 632                 if ((bs != 1) && !send)
 633                         {
 634                         ii=i=rec->data[l-1]; /* padding_length */
 635                         i++;
 636                         /* NB: if compression is in operation the first packet
 637                          * may not be of even length so the padding bug check
 638                          * cannot be performed. This bug workaround has been
 639                          * around since SSLeay so hopefully it is either fixed
 640                          * now or no buggy implementation supports compression
 641                          * [steve]
 642                          */
 643                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 644                                 && !s->expand)
 645                                 {
 646                                 /* First packet is even in size, so check */
 647                                 if ((memcmp(s->s3->read_sequence,
 648                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 649                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 650                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 651                                         i--;
 652                                 }
 653                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 654                          * All of them must have value 'padding_length'. */
 655                         if (i > (int)rec->length)
 656                                 {
 657                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 658                                  * by caller: we don't want to reveal whether this is
 659                                  * a decryption error or a MAC verification failure
 660                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 661                                 return -1;
 662                                 }
 663                         for (j=(int)(l-i); j<(int)l; j++)
 664                                 {
 665                                 if (rec->data[j] != ii)
 666                                         {
 667                                         /* Incorrect padding */
 668                                         return -1;
 669                                         }
 670                                 }
 671                         rec->length-=i;
 672                         }
 673                 }
 674         return(1);
 675         }
 676
 677 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 678         {
 679         unsigned int ret;
 680         EVP_MD_CTX ctx;
 681
 682         EVP_MD_CTX_init(&ctx);
 683         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 684         EVP_DigestFinal_ex(&ctx,out,&ret);
 685         EVP_MD_CTX_cleanup(&ctx);
 686         return((int)ret);
 687         }
 688
 689 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 690              const char *str, int slen, unsigned char *out)
 691         {
 692         unsigned int i;
 693         EVP_MD_CTX ctx;
 694         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 695         unsigned char *q,buf2[12];
 696
 697         q=buf;
 698         memcpy(q,str,slen);
 699         q+=slen;
 700
 701         EVP_MD_CTX_init(&ctx);
 702         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 703         EVP_DigestFinal_ex(&ctx,q,&i);
 704         q+=i;
 705         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 706         EVP_DigestFinal_ex(&ctx,q,&i);
 707         q+=i;
 708
 709         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 710                 s->session->master_key,s->session->master_key_length,
 711                 out,buf2,sizeof buf2);
 712         EVP_MD_CTX_cleanup(&ctx);
 713
 714         return sizeof buf2;
 715         }
 716
 717 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 718         {
 719         SSL3_RECORD *rec;
 720         unsigned char *mac_sec,*seq;
 721         const EVP_MD *hash;
 722         unsigned int md_size;
 723         int i;
 724         HMAC_CTX hmac;
 725         unsigned char buf[5];
 726
 727         if (send)
 728                 {
 729                 rec= &(ssl->s3->wrec);
 730                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 731                 seq= &(ssl->s3->write_sequence[0]);
 732                 hash=ssl->write_hash;
 733                 }
 734         else
 735                 {
 736                 rec= &(ssl->s3->rrec);
 737                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 738                 seq= &(ssl->s3->read_sequence[0]);
 739                 hash=ssl->read_hash;
 740                 }
 741
 742         md_size=EVP_MD_size(hash);
 743
 744         buf[0]=rec->type;
 745         if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER)
 746                 {
 747                 buf[1]=TLS1_VERSION_MAJOR;
 748                 buf[2]=TLS1_VERSION_MINOR;
 749                 }
 750         else    {
 751                 buf[1]=(unsigned char)(ssl->version>>8);
 752                 buf[2]=(unsigned char)(ssl->version);
 753                 }
 754
 755         buf[3]=rec->length>>8;
 756         buf[4]=rec->length&0xff;
 757
 758         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 759         HMAC_CTX_init(&hmac);
 760         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
 761
 762         if (ssl->version == DTLS1_BAD_VER ||
 763             (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER))
 764                 {
 765                 unsigned char dtlsseq[8],*p=dtlsseq;
 766                 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
 767                 memcpy (p,&seq[2],6);
 768
 769                 HMAC_Update(&hmac,dtlsseq,8);
 770                 }
 771         else
 772                 HMAC_Update(&hmac,seq,8);
 773
 774         HMAC_Update(&hmac,buf,5);
 775         HMAC_Update(&hmac,rec->input,rec->length);
 776         HMAC_Final(&hmac,md,&md_size);
 777         HMAC_CTX_cleanup(&hmac);
 778
 779 #ifdef TLS_DEBUG
 780 printf("sec=");
 781 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 782 printf("seq=");
 783 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 784 printf("buf=");
 785 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 786 printf("rec=");
 787 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 788 #endif
 789
 790         if ( SSL_version(ssl) != DTLS1_VERSION && SSL_version(ssl) != DTLS1_BAD_VER)
 791                 {
 792                 for (i=7; i>=0; i--)
 793                         {
 794                         ++seq[i];
 795                         if (seq[i] != 0) break;
 796                         }
 797                 }
 798
 799 #ifdef TLS_DEBUG
 800 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 801 #endif
 802         return(md_size);
 803         }
 804
 805 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 806              int len)
 807         {
 808         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 809         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 810
 811 #ifdef KSSL_DEBUG
 812         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s,out, p,len);
 813 #endif  /* KSSL_DEBUG */
 814
 815         /* Setup the stuff to munge */
 816         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 817                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 818         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 819                 s->s3->client_random,SSL3_RANDOM_SIZE);
 820         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 821                 s->s3->server_random,SSL3_RANDOM_SIZE);
 822         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 823                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 824                 s->session->master_key,buff,sizeof buff);
 825 #ifdef KSSL_DEBUG
 826         printf ("tls1_generate_master_secret() complete\n");
 827 #endif  /* KSSL_DEBUG */
 828         return(SSL3_MASTER_SECRET_SIZE);
 829         }
 830
 831 int tls1_alert_code(int code)
 832         {
 833         switch (code)
 834                 {
 835         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 836         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 837         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 838         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 839         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 840         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 841         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 842         case SSL_AD_NO_CERTIFICATE:     return(-1);
 843         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 844         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 845         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 846         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 847         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 848         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 849         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 850         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 851         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 852         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 853         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 854         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 855         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 856         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 857         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 858         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 859 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 860         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 861                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 862 #endif
 863         default:                        return(-1);
 864                 }
 865         }
 866