ssl/s3_enc.c

   1 /* ssl/s3_enc.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/md5.h>
  61 #include <openssl/sha.h>
  62 #include <openssl/evp.h>
  63 #include "ssl_locl.h"
  64
  65 static unsigned char ssl3_pad_1[48]={
  66         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  67         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  68         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  69         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  70         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  71         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
  72
  73 static unsigned char ssl3_pad_2[48]={
  74         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  75         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  76         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  77         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  78         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  79         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
  80
  81 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
  82         const char *sender, int len, unsigned char *p);
  83
  84 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
  85         {
  86         MD5_CTX m5;
  87         SHA_CTX s1;
  88         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
  89         unsigned char c='A';
  90         int i,j,k;
  91
  92 #ifdef CHARSET_EBCDIC
  93         c = os_toascii[c]; /*'A' in ASCII */
  94 #endif
  95         k=0;
  96         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  97                 {
  98                 k++;
  99                 if (k > sizeof buf)
 100                         {
 101                         /* bug: 'buf' is too small for this ciphersuite */
 102                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 103                         return 0;
 104                         }
 105
 106                 for (j=0; j<k; j++)
 107                         buf[j]=c;
 108                 c++;
 109                 SHA1_Init(  &s1);
 110                 SHA1_Update(&s1,buf,k);
 111                 SHA1_Update(&s1,s->session->master_key,
 112                         s->session->master_key_length);
 113                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 114                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 115                 SHA1_Final( smd,&s1);
 116
 117                 MD5_Init(  &m5);
 118                 MD5_Update(&m5,s->session->master_key,
 119                         s->session->master_key_length);
 120                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
 121                 if ((i+MD5_DIGEST_LENGTH) > num)
 122                         {
 123                         MD5_Final(smd,&m5);
 124                         memcpy(km,smd,(num-i));
 125                         }
 126                 else
 127                         MD5_Final(km,&m5);
 128
 129                 km+=MD5_DIGEST_LENGTH;
 130                 }
 131         memset(smd,0,SHA_DIGEST_LENGTH);
 132         return 1;
 133         }
 134
 135 int ssl3_change_cipher_state(SSL *s, int which)
 136         {
 137         unsigned char *p,*key_block,*mac_secret;
 138         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 139         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 140         unsigned char *ms,*key,*iv,*er1,*er2;
 141         EVP_CIPHER_CTX *dd;
 142         const EVP_CIPHER *c;
 143         COMP_METHOD *comp;
 144         const EVP_MD *m;
 145         MD5_CTX md;
 146         int exp,n,i,j,k,cl;
 147
 148         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 149         c=s->s3->tmp.new_sym_enc;
 150         m=s->s3->tmp.new_hash;
 151         if (s->s3->tmp.new_compression == NULL)
 152                 comp=NULL;
 153         else
 154                 comp=s->s3->tmp.new_compression->method;
 155         key_block=s->s3->tmp.key_block;
 156
 157         if (which & SSL3_CC_READ)
 158                 {
 159                 if ((s->enc_read_ctx == NULL) &&
 160                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 161                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 162                         goto err;
 163                 dd= s->enc_read_ctx;
 164                 s->read_hash=m;
 165                 /* COMPRESS */
 166                 if (s->expand != NULL)
 167                         {
 168                         COMP_CTX_free(s->expand);
 169                         s->expand=NULL;
 170                         }
 171                 if (comp != NULL)
 172                         {
 173                         s->expand=COMP_CTX_new(comp);
 174                         if (s->expand == NULL)
 175                                 {
 176                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 177                                 goto err2;
 178                                 }
 179                         if (s->s3->rrec.comp == NULL)
 180                                 s->s3->rrec.comp=(unsigned char *)
 181                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 182                         if (s->s3->rrec.comp == NULL)
 183                                 goto err;
 184                         }
 185                 memset(&(s->s3->read_sequence[0]),0,8);
 186                 mac_secret= &(s->s3->read_mac_secret[0]);
 187                 }
 188         else
 189                 {
 190                 if ((s->enc_write_ctx == NULL) &&
 191                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 192                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 193                         goto err;
 194                 dd= s->enc_write_ctx;
 195                 s->write_hash=m;
 196                 /* COMPRESS */
 197                 if (s->compress != NULL)
 198                         {
 199                         COMP_CTX_free(s->compress);
 200                         s->compress=NULL;
 201                         }
 202                 if (comp != NULL)
 203                         {
 204                         s->compress=COMP_CTX_new(comp);
 205                         if (s->compress == NULL)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 208                                 goto err2;
 209                                 }
 210                         }
 211                 memset(&(s->s3->write_sequence[0]),0,8);
 212                 mac_secret= &(s->s3->write_mac_secret[0]);
 213                 }
 214
 215         EVP_CIPHER_CTX_init(dd);
 216
 217         p=s->s3->tmp.key_block;
 218         i=EVP_MD_size(m);
 219         cl=EVP_CIPHER_key_length(c);
 220         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 221                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 222         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 223         k=EVP_CIPHER_iv_length(c);
 224         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 225                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 226                 {
 227                 ms=  &(p[ 0]); n=i+i;
 228                 key= &(p[ n]); n+=j+j;
 229                 iv=  &(p[ n]); n+=k+k;
 230                 er1= &(s->s3->client_random[0]);
 231                 er2= &(s->s3->server_random[0]);
 232                 }
 233         else
 234                 {
 235                 n=i;
 236                 ms=  &(p[ n]); n+=i+j;
 237                 key= &(p[ n]); n+=j+k;
 238                 iv=  &(p[ n]); n+=k;
 239                 er1= &(s->s3->server_random[0]);
 240                 er2= &(s->s3->client_random[0]);
 241                 }
 242
 243         if (n > s->s3->tmp.key_block_length)
 244                 {
 245                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 246                 goto err2;
 247                 }
 248
 249         memcpy(mac_secret,ms,i);
 250         if (exp)
 251                 {
 252                 /* In here I set both the read and write key/iv to the
 253                  * same value since only the correct one will be used :-).
 254                  */
 255                 MD5_Init(&md);
 256                 MD5_Update(&md,key,j);
 257                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 258                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 259                 MD5_Final(&(exp_key[0]),&md);
 260                 key= &(exp_key[0]);
 261
 262                 if (k > 0)
 263                         {
 264                         MD5_Init(&md);
 265                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 266                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 267                         MD5_Final(&(exp_iv[0]),&md);
 268                         iv= &(exp_iv[0]);
 269                         }
 270                 }
 271
 272         s->session->key_arg_length=0;
 273
 274         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 275
 276         memset(&(exp_key[0]),0,sizeof(exp_key));
 277         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 278         return(1);
 279 err:
 280         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 281 err2:
 282         return(0);
 283         }
 284
 285 int ssl3_setup_key_block(SSL *s)
 286         {
 287         unsigned char *p;
 288         const EVP_CIPHER *c;
 289         const EVP_MD *hash;
 290         int num;
 291         SSL_COMP *comp;
 292
 293         if (s->s3->tmp.key_block_length != 0)
 294                 return(1);
 295
 296         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 297                 {
 298                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 299                 return(0);
 300                 }
 301
 302         s->s3->tmp.new_sym_enc=c;
 303         s->s3->tmp.new_hash=hash;
 304         s->s3->tmp.new_compression=comp;
 305
 306         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 307         num*=2;
 308
 309         ssl3_cleanup_key_block(s);
 310
 311         if ((p=OPENSSL_malloc(num)) == NULL)
 312                 goto err;
 313
 314         s->s3->tmp.key_block_length=num;
 315         s->s3->tmp.key_block=p;
 316
 317         return ssl3_generate_key_block(s,p,num);
 318
 319 err:
 320         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 321         return(0);
 322         }
 323
 324 void ssl3_cleanup_key_block(SSL *s)
 325         {
 326         if (s->s3->tmp.key_block != NULL)
 327                 {
 328                 memset(s->s3->tmp.key_block,0,
 329                         s->s3->tmp.key_block_length);
 330                 OPENSSL_free(s->s3->tmp.key_block);
 331                 s->s3->tmp.key_block=NULL;
 332                 }
 333         s->s3->tmp.key_block_length=0;
 334         }
 335
 336 int ssl3_enc(SSL *s, int send)
 337         {
 338         SSL3_RECORD *rec;
 339         EVP_CIPHER_CTX *ds;
 340         unsigned long l;
 341         int bs,i;
 342         const EVP_CIPHER *enc;
 343
 344         if (send)
 345                 {
 346                 ds=s->enc_write_ctx;
 347                 rec= &(s->s3->wrec);
 348                 if (s->enc_write_ctx == NULL)
 349                         enc=NULL;
 350                 else
 351                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 352                 }
 353         else
 354                 {
 355                 ds=s->enc_read_ctx;
 356                 rec= &(s->s3->rrec);
 357                 if (s->enc_read_ctx == NULL)
 358                         enc=NULL;
 359                 else
 360                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 361                 }
 362
 363         if ((s->session == NULL) || (ds == NULL) ||
 364                 (enc == NULL))
 365                 {
 366                 memcpy(rec->data,rec->input,rec->length);
 367                 rec->input=rec->data;
 368                 }
 369         else
 370                 {
 371                 l=rec->length;
 372                 bs=EVP_CIPHER_block_size(ds->cipher);
 373
 374                 /* COMPRESS */
 375
 376                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 377                 if ((bs != 1) && send)
 378                         {
 379                         i=bs-((int)l%bs);
 380
 381                         /* we need to add 'i-1' padding bytes */
 382                         l+=i;
 383                         rec->length+=i;
 384                         rec->input[l-1]=(i-1);
 385                         }
 386
 387                 EVP_Cipher(ds,rec->data,rec->input,l);
 388
 389                 if ((bs != 1) && !send)
 390                         {
 391                         i=rec->data[l-1]+1;
 392                         if (i > bs)
 393                                 {
 394                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 395                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 396                                 return(0);
 397                                 }
 398                         rec->length-=i;
 399                         }
 400                 }
 401         return(1);
 402         }
 403
 404 void ssl3_init_finished_mac(SSL *s)
 405         {
 406         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 407         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 408         }
 409
 410 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 411         {
 412         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 413         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 414         }
 415
 416 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 417         {
 418         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 419         }
 420
 421 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 422              const char *sender, int len, unsigned char *p)
 423         {
 424         int ret;
 425
 426         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 427         p+=ret;
 428         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 429         return(ret);
 430         }
 431
 432 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 433              const char *sender, int len, unsigned char *p)
 434         {
 435         unsigned int ret;
 436         int npad,n;
 437         unsigned int i;
 438         unsigned char md_buf[EVP_MAX_MD_SIZE];
 439         EVP_MD_CTX ctx;
 440
 441         EVP_MD_CTX_copy(&ctx,in_ctx);
 442
 443         n=EVP_MD_CTX_size(&ctx);
 444         npad=(48/n)*n;
 445
 446         if (sender != NULL)
 447                 EVP_DigestUpdate(&ctx,sender,len);
 448         EVP_DigestUpdate(&ctx,s->session->master_key,
 449                 s->session->master_key_length);
 450         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 451         EVP_DigestFinal(&ctx,md_buf,&i);
 452
 453         EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
 454         EVP_DigestUpdate(&ctx,s->session->master_key,
 455                 s->session->master_key_length);
 456         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 457         EVP_DigestUpdate(&ctx,md_buf,i);
 458         EVP_DigestFinal(&ctx,p,&ret);
 459
 460         memset(&ctx,0,sizeof(EVP_MD_CTX));
 461
 462         return((int)ret);
 463         }
 464
 465 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 466         {
 467         SSL3_RECORD *rec;
 468         unsigned char *mac_sec,*seq;
 469         EVP_MD_CTX md_ctx;
 470         const EVP_MD *hash;
 471         unsigned char *p,rec_char;
 472         unsigned int md_size;
 473         int npad,i;
 474
 475         if (send)
 476                 {
 477                 rec= &(ssl->s3->wrec);
 478                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 479                 seq= &(ssl->s3->write_sequence[0]);
 480                 hash=ssl->write_hash;
 481                 }
 482         else
 483                 {
 484                 rec= &(ssl->s3->rrec);
 485                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 486                 seq= &(ssl->s3->read_sequence[0]);
 487                 hash=ssl->read_hash;
 488                 }
 489
 490         md_size=EVP_MD_size(hash);
 491         npad=(48/md_size)*md_size;
 492
 493         /* Chop the digest off the end :-) */
 494
 495         EVP_DigestInit(  &md_ctx,hash);
 496         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 497         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 498         EVP_DigestUpdate(&md_ctx,seq,8);
 499         rec_char=rec->type;
 500         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 501         p=md;
 502         s2n(rec->length,p);
 503         EVP_DigestUpdate(&md_ctx,md,2);
 504         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 505         EVP_DigestFinal( &md_ctx,md,NULL);
 506
 507         EVP_DigestInit(  &md_ctx,hash);
 508         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 509         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 510         EVP_DigestUpdate(&md_ctx,md,md_size);
 511         EVP_DigestFinal( &md_ctx,md,&md_size);
 512
 513         for (i=7; i>=0; i--)
 514                 {
 515                 ++seq[i];
 516                 if (seq[i] != 0) break;
 517                 }
 518
 519         return(md_size);
 520         }
 521
 522 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 523              int len)
 524         {
 525         static const unsigned char *salt[3]={
 526 #ifndef CHARSET_EBCDIC
 527                 (const unsigned char *)"A",
 528                 (const unsigned char *)"BB",
 529                 (const unsigned char *)"CCC",
 530 #else
 531                 (const unsigned char *)"\x41",
 532                 (const unsigned char *)"\x42\x42",
 533                 (const unsigned char *)"\x43\x43\x43",
 534 #endif
 535                 };
 536         unsigned char buf[EVP_MAX_MD_SIZE];
 537         EVP_MD_CTX ctx;
 538         int i,ret=0;
 539         unsigned int n;
 540
 541         for (i=0; i<3; i++)
 542                 {
 543                 EVP_DigestInit(&ctx,s->ctx->sha1);
 544                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 545                 EVP_DigestUpdate(&ctx,p,len);
 546                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 547                         SSL3_RANDOM_SIZE);
 548                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 549                         SSL3_RANDOM_SIZE);
 550                 EVP_DigestFinal(&ctx,buf,&n);
 551
 552                 EVP_DigestInit(&ctx,s->ctx->md5);
 553                 EVP_DigestUpdate(&ctx,p,len);
 554                 EVP_DigestUpdate(&ctx,buf,n);
 555                 EVP_DigestFinal(&ctx,out,&n);
 556                 out+=n;
 557                 ret+=n;
 558                 }
 559         return(ret);
 560         }
 561
 562 int ssl3_alert_code(int code)
 563         {
 564         switch (code)
 565                 {
 566         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 567         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 568         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 569         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 570         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 571         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 572         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 573         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 574         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 575         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 576         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 577         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 578         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 579         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 580         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 581         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 582         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 583         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 584         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 585         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 586         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 587         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 588         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 589         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 590         default:                        return(-1);
 591                 }
 592         }
 593