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 "evp.h"
  61 #include "ssl_locl.h"
  62
  63 static unsigned char ssl3_pad_1[48]={
  64         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  65         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
  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
  71 static unsigned char ssl3_pad_2[48]={
  72         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  73         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
  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
  79 #ifndef NO_PROTO
  80 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
  81         unsigned char *sender, int len, unsigned char *p);
  82 #else
  83 static int ssl3_handshake_mac();
  84 #endif
  85
  86 static void ssl3_generate_key_block(s,km,num)
  87 SSL *s;
  88 unsigned char *km;
  89 int num;
  90         {
  91         MD5_CTX m5;
  92         SHA_CTX s1;
  93         unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
  94         unsigned char c='A';
  95         int i,j,k;
  96
  97         k=0;
  98         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  99                 {
 100                 k++;
 101                 for (j=0; j<k; j++)
 102                         buf[j]=c;
 103                 c++;
 104                 SHA1_Init(  &s1);
 105                 SHA1_Update(&s1,buf,k);
 106                 SHA1_Update(&s1,s->session->master_key,
 107                         s->session->master_key_length);
 108                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 109                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 110                 SHA1_Final( smd,&s1);
 111
 112                 MD5_Init(  &m5);
 113                 MD5_Update(&m5,s->session->master_key,
 114                         s->session->master_key_length);
 115                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
 116                 if ((i+MD5_DIGEST_LENGTH) > num)
 117                         {
 118                         MD5_Final(smd,&m5);
 119                         memcpy(km,smd,(num-i));
 120                         }
 121                 else
 122                         MD5_Final(km,&m5);
 123
 124                 km+=MD5_DIGEST_LENGTH;
 125                 }
 126         memset(smd,0,SHA_DIGEST_LENGTH);
 127         }
 128
 129 int ssl3_change_cipher_state(s,which)
 130 SSL *s;
 131 int which;
 132         {
 133         unsigned char *p,*key_block,*mac_secret;
 134         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 135         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 136         unsigned char *ms,*key,*iv,*er1,*er2;
 137         EVP_CIPHER_CTX *dd;
 138         EVP_CIPHER *c;
 139         SSL_COMPRESSION *comp;
 140         EVP_MD *m;
 141         MD5_CTX md;
 142         int exp,n,i,j,k;
 143
 144         exp=(s->s3->tmp.new_cipher->algorithms & SSL_EXPORT)?1:0;
 145         c=s->s3->tmp.new_sym_enc;
 146         m=s->s3->tmp.new_hash;
 147         comp=s->s3->tmp.new_compression;
 148         key_block=s->s3->tmp.key_block;
 149
 150         if (which & SSL3_CC_READ)
 151                 {
 152                 if ((s->enc_read_ctx == NULL) &&
 153                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 154                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 155                         goto err;
 156                 dd= s->enc_read_ctx;
 157                 s->read_hash=m;
 158                 s->read_compression=comp;
 159                 memset(&(s->s3->read_sequence[0]),0,8);
 160                 mac_secret= &(s->s3->read_mac_secret[0]);
 161                 }
 162         else
 163                 {
 164                 if ((s->enc_write_ctx == NULL) &&
 165                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 166                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 167                         goto err;
 168                 dd= s->enc_write_ctx;
 169                 s->write_hash=m;
 170                 s->write_compression=comp;
 171                 memset(&(s->s3->write_sequence[0]),0,8);
 172                 mac_secret= &(s->s3->write_mac_secret[0]);
 173                 }
 174
 175         EVP_CIPHER_CTX_init(dd);
 176
 177         p=s->s3->tmp.key_block;
 178         i=EVP_MD_size(m);
 179         j=(exp)?5:EVP_CIPHER_key_length(c);
 180         k=EVP_CIPHER_iv_length(c);
 181         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 182                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 183                 {
 184                 ms=  &(p[ 0]); n=i+i;
 185                 key= &(p[ n]); n+=j+j;
 186                 iv=  &(p[ n]); n+=k+k;
 187                 er1= &(s->s3->client_random[0]);
 188                 er2= &(s->s3->server_random[0]);
 189                 }
 190         else
 191                 {
 192                 n=i;
 193                 ms=  &(p[ n]); n+=i+j;
 194                 key= &(p[ n]); n+=j+k;
 195                 iv=  &(p[ n]); n+=k;
 196                 er1= &(s->s3->server_random[0]);
 197                 er2= &(s->s3->client_random[0]);
 198                 }
 199
 200         if (n > s->s3->tmp.key_block_length)
 201                 {
 202                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 203                 goto err2;
 204                 }
 205
 206         memcpy(mac_secret,ms,i);
 207         if (exp)
 208                 {
 209                 /* In here I set both the read and write key/iv to the
 210                  * same value since only the correct one will be used :-).
 211                  */
 212                 MD5_Init(&md);
 213                 MD5_Update(&md,key,j);
 214                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 215                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 216                 MD5_Final(&(exp_key[0]),&md);
 217                 key= &(exp_key[0]);
 218
 219                 if (k > 0)
 220                         {
 221                         MD5_Init(&md);
 222                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 223                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 224                         MD5_Final(&(exp_iv[0]),&md);
 225                         iv= &(exp_iv[0]);
 226                         }
 227                 }
 228
 229         s->session->key_arg_length=0;
 230
 231         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 232
 233         memset(&(exp_key[0]),0,sizeof(exp_key));
 234         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 235         return(1);
 236 err:
 237         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 238 err2:
 239         return(0);
 240         }
 241
 242 int ssl3_setup_key_block(s)
 243 SSL *s;
 244         {
 245         unsigned char *p;
 246         EVP_CIPHER *c;
 247         EVP_MD *hash;
 248         int num,exp;
 249
 250         if (s->s3->tmp.key_block_length != 0)
 251                 return(1);
 252
 253         if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
 254                 {
 255                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 256                 return(0);
 257                 }
 258
 259         s->s3->tmp.new_sym_enc=c;
 260         s->s3->tmp.new_hash=hash;
 261
 262         exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
 263
 264         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 265         num*=2;
 266
 267         ssl3_cleanup_key_block(s);
 268
 269         if ((p=(unsigned char *)Malloc(num)) == NULL)
 270                 goto err;
 271
 272         s->s3->tmp.key_block_length=num;
 273         s->s3->tmp.key_block=p;
 274
 275         ssl3_generate_key_block(s,p,num);
 276
 277         return(1);
 278 err:
 279         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 280         return(0);
 281         }
 282
 283 void ssl3_cleanup_key_block(s)
 284 SSL *s;
 285         {
 286         if (s->s3->tmp.key_block != NULL)
 287                 {
 288                 memset(s->s3->tmp.key_block,0,
 289                         s->s3->tmp.key_block_length);
 290                 Free(s->s3->tmp.key_block);
 291                 s->s3->tmp.key_block=NULL;
 292                 }
 293         s->s3->tmp.key_block_length=0;
 294         }
 295
 296 int ssl3_enc(s,send)
 297 SSL *s;
 298 int send;
 299         {
 300         SSL3_RECORD *rec;
 301         EVP_CIPHER_CTX *ds;
 302         unsigned long l;
 303         int bs,i;
 304         EVP_CIPHER *enc;
 305         SSL_COMPRESSION *comp;
 306
 307         if (send)
 308                 {
 309                 ds=s->enc_write_ctx;
 310                 rec= &(s->s3->wrec);
 311                 if (s->enc_write_ctx == NULL)
 312                         { enc=NULL; comp=NULL; }
 313                 else
 314                         {
 315                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 316                         comp=s->write_compression;
 317                         }
 318                 }
 319         else
 320                 {
 321                 ds=s->enc_read_ctx;
 322                 rec= &(s->s3->rrec);
 323                 if (s->enc_read_ctx == NULL)
 324                         { enc=NULL; comp=NULL; }
 325                 else
 326                         {
 327                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 328                         comp=s->read_compression;
 329                         }
 330                 }
 331
 332         if ((s->session == NULL) || (ds == NULL) ||
 333                 ((enc == NULL) && (comp == NULL)))
 334                 {
 335                 memcpy(rec->data,rec->input,rec->length);
 336                 rec->input=rec->data;
 337                 }
 338         else
 339                 {
 340                 l=rec->length;
 341                 bs=EVP_CIPHER_block_size(ds->cipher);
 342
 343                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 344                 if ((bs != 1) && send)
 345                         {
 346                         i=bs-((int)l%bs);
 347
 348                         /* we need to add 'i-1' padding bytes */
 349                         l+=i;
 350                         rec->length+=i;
 351                         rec->input[l-1]=(i-1);
 352                         }
 353
 354                 EVP_Cipher(ds,rec->data,rec->input,l);
 355
 356                 if ((bs != 1) && !send)
 357                         {
 358                         i=rec->data[l-1]+1;
 359                         if (i > bs)
 360                                 {
 361                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 362                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 363                                 return(0);
 364                                 }
 365                         rec->length-=i;
 366                         }
 367                 }
 368         return(1);
 369         }
 370
 371 void ssl3_init_finished_mac(s)
 372 SSL *s;
 373         {
 374         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 375         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 376         }
 377
 378 void ssl3_finish_mac(s,buf,len)
 379 SSL *s;
 380 unsigned char *buf;
 381 int len;
 382         {
 383         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 384         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 385         }
 386
 387 int ssl3_cert_verify_mac(s,ctx,p)
 388 SSL *s;
 389 EVP_MD_CTX *ctx;
 390 unsigned char *p;
 391         {
 392         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 393         }
 394
 395 int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
 396 SSL *s;
 397 EVP_MD_CTX *ctx1,*ctx2;
 398 unsigned char *sender;
 399 int len;
 400 unsigned char *p;
 401         {
 402         int ret;
 403
 404         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 405         p+=ret;
 406         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 407         return(ret);
 408         }
 409
 410 static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
 411 SSL *s;
 412 EVP_MD_CTX *in_ctx;
 413 unsigned char *sender;
 414 int len;
 415 unsigned char *p;
 416         {
 417         unsigned int ret;
 418         int npad,n;
 419         unsigned int i;
 420         unsigned char md_buf[EVP_MAX_MD_SIZE];
 421         EVP_MD_CTX ctx;
 422
 423         memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));
 424
 425         n=EVP_MD_CTX_size(&ctx);
 426         npad=(48/n)*n;
 427
 428         if (sender != NULL)
 429                 EVP_DigestUpdate(&ctx,sender,len);
 430         EVP_DigestUpdate(&ctx,s->session->master_key,
 431                 s->session->master_key_length);
 432         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 433         EVP_DigestFinal(&ctx,md_buf,&i);
 434
 435         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
 436         EVP_DigestUpdate(&ctx,s->session->master_key,
 437                 s->session->master_key_length);
 438         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 439         EVP_DigestUpdate(&ctx,md_buf,i);
 440         EVP_DigestFinal(&ctx,p,&ret);
 441
 442         memset(&ctx,0,sizeof(EVP_MD_CTX));
 443
 444         return((int)ret);
 445         }
 446
 447 int ssl3_mac(ssl,md,send)
 448 SSL *ssl;
 449 unsigned char *md;
 450 int send;
 451         {
 452         SSL3_RECORD *rec;
 453         unsigned char *mac_sec,*seq;
 454         EVP_MD_CTX md_ctx;
 455         EVP_MD *hash;
 456         unsigned char *p,rec_char;
 457         unsigned int md_size;
 458         int npad,i;
 459
 460         if (send)
 461                 {
 462                 rec= &(ssl->s3->wrec);
 463                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 464                 seq= &(ssl->s3->write_sequence[0]);
 465                 hash=ssl->write_hash;
 466                 }
 467         else
 468                 {
 469                 rec= &(ssl->s3->rrec);
 470                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 471                 seq= &(ssl->s3->read_sequence[0]);
 472                 hash=ssl->read_hash;
 473                 }
 474
 475         md_size=EVP_MD_size(hash);
 476         npad=(48/md_size)*md_size;
 477
 478         /* Chop the digest off the end :-) */
 479
 480         EVP_DigestInit(  &md_ctx,hash);
 481         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 482         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 483         EVP_DigestUpdate(&md_ctx,seq,8);
 484         rec_char=rec->type;
 485         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 486         p=md;
 487         s2n(rec->length,p);
 488         EVP_DigestUpdate(&md_ctx,md,2);
 489         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 490         EVP_DigestFinal( &md_ctx,md,NULL);
 491
 492         EVP_DigestInit(  &md_ctx,hash);
 493         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 494         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 495         EVP_DigestUpdate(&md_ctx,md,md_size);
 496         EVP_DigestFinal( &md_ctx,md,&md_size);
 497
 498         for (i=7; i>=0; i--)
 499                 if (++seq[i]) break;
 500
 501         return(md_size);
 502         }
 503
 504 int ssl3_generate_master_secret(s,out,p,len)
 505 SSL *s;
 506 unsigned char *out;
 507 unsigned char *p;
 508 int len;
 509         {
 510         static unsigned char *salt[3]={
 511                 (unsigned char *)"A",
 512                 (unsigned char *)"BB",
 513                 (unsigned char *)"CCC",
 514                 };
 515         unsigned char buf[EVP_MAX_MD_SIZE];
 516         EVP_MD_CTX ctx;
 517         int i,ret=0;
 518         unsigned int n;
 519
 520         for (i=0; i<3; i++)
 521                 {
 522                 EVP_DigestInit(&ctx,s->ctx->sha1);
 523                 EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
 524                 EVP_DigestUpdate(&ctx,p,len);
 525                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 526                         SSL3_RANDOM_SIZE);
 527                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 528                         SSL3_RANDOM_SIZE);
 529                 EVP_DigestFinal(&ctx,buf,&n);
 530
 531                 EVP_DigestInit(&ctx,s->ctx->md5);
 532                 EVP_DigestUpdate(&ctx,p,len);
 533                 EVP_DigestUpdate(&ctx,buf,n);
 534                 EVP_DigestFinal(&ctx,out,&n);
 535                 out+=n;
 536                 ret+=n;
 537                 }
 538         return(ret);
 539         }
 540
 541 int ssl3_alert_code(code)
 542 int code;
 543         {
 544         switch (code)
 545                 {
 546         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 547         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 548         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 549         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 550         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 551         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 552         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 553         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 554         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 555         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 556         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 557         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 558         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 559         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 560         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 561         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 562         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 563         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 564         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
 565         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 566         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 567         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 568         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
 569         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 570         default:                        return(-1);
 571                 }
 572         }
 573