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/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(SSL *s, unsigned char *km, int num)
  87         {
  88         MD5_CTX m5;
  89         SHA_CTX s1;
  90         unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
  91         unsigned char c='A';
  92         int i,j,k;
  93
  94         k=0;
  95         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  96                 {
  97                 k++;
  98                 for (j=0; j<k; j++)
  99                         buf[j]=c;
 100                 c++;
 101                 SHA1_Init(  &s1);
 102                 SHA1_Update(&s1,buf,k);
 103                 SHA1_Update(&s1,s->session->master_key,
 104                         s->session->master_key_length);
 105                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 106                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 107                 SHA1_Final( smd,&s1);
 108
 109                 MD5_Init(  &m5);
 110                 MD5_Update(&m5,s->session->master_key,
 111                         s->session->master_key_length);
 112                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
 113                 if ((i+MD5_DIGEST_LENGTH) > num)
 114                         {
 115                         MD5_Final(smd,&m5);
 116                         memcpy(km,smd,(num-i));
 117                         }
 118                 else
 119                         MD5_Final(km,&m5);
 120
 121                 km+=MD5_DIGEST_LENGTH;
 122                 }
 123         memset(smd,0,SHA_DIGEST_LENGTH);
 124         }
 125
 126 int ssl3_change_cipher_state(SSL *s, int which)
 127         {
 128         unsigned char *p,*key_block,*mac_secret;
 129         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 130         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 131         unsigned char *ms,*key,*iv,*er1,*er2;
 132         EVP_CIPHER_CTX *dd;
 133         const EVP_CIPHER *c;
 134         COMP_METHOD *comp;
 135         const EVP_MD *m;
 136         MD5_CTX md;
 137         int exp,n,i,j,k,cl;
 138
 139         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 140         c=s->s3->tmp.new_sym_enc;
 141         m=s->s3->tmp.new_hash;
 142         if (s->s3->tmp.new_compression == NULL)
 143                 comp=NULL;
 144         else
 145                 comp=s->s3->tmp.new_compression->method;
 146         key_block=s->s3->tmp.key_block;
 147
 148         if (which & SSL3_CC_READ)
 149                 {
 150                 if ((s->enc_read_ctx == NULL) &&
 151                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 152                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 153                         goto err;
 154                 dd= s->enc_read_ctx;
 155                 s->read_hash=m;
 156                 /* COMPRESS */
 157                 if (s->expand != NULL)
 158                         {
 159                         COMP_CTX_free(s->expand);
 160                         s->expand=NULL;
 161                         }
 162                 if (comp != NULL)
 163                         {
 164                         s->expand=COMP_CTX_new(comp);
 165                         if (s->expand == NULL)
 166                                 {
 167                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 168                                 goto err2;
 169                                 }
 170                         if (s->s3->rrec.comp == NULL)
 171                                 s->s3->rrec.comp=(unsigned char *)
 172                                         Malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 173                         if (s->s3->rrec.comp == NULL)
 174                                 goto err;
 175                         }
 176                 memset(&(s->s3->read_sequence[0]),0,8);
 177                 mac_secret= &(s->s3->read_mac_secret[0]);
 178                 }
 179         else
 180                 {
 181                 if ((s->enc_write_ctx == NULL) &&
 182                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 183                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 184                         goto err;
 185                 dd= s->enc_write_ctx;
 186                 s->write_hash=m;
 187                 /* COMPRESS */
 188                 if (s->compress != NULL)
 189                         {
 190                         COMP_CTX_free(s->compress);
 191                         s->compress=NULL;
 192                         }
 193                 if (comp != NULL)
 194                         {
 195                         s->compress=COMP_CTX_new(comp);
 196                         if (s->compress == NULL)
 197                                 {
 198                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 199                                 goto err2;
 200                                 }
 201                         }
 202                 memset(&(s->s3->write_sequence[0]),0,8);
 203                 mac_secret= &(s->s3->write_mac_secret[0]);
 204                 }
 205
 206         EVP_CIPHER_CTX_init(dd);
 207
 208         p=s->s3->tmp.key_block;
 209         i=EVP_MD_size(m);
 210         cl=EVP_CIPHER_key_length(c);
 211         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 212                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 213         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 214         k=EVP_CIPHER_iv_length(c);
 215         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 216                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 217                 {
 218                 ms=  &(p[ 0]); n=i+i;
 219                 key= &(p[ n]); n+=j+j;
 220                 iv=  &(p[ n]); n+=k+k;
 221                 er1= &(s->s3->client_random[0]);
 222                 er2= &(s->s3->server_random[0]);
 223                 }
 224         else
 225                 {
 226                 n=i;
 227                 ms=  &(p[ n]); n+=i+j;
 228                 key= &(p[ n]); n+=j+k;
 229                 iv=  &(p[ n]); n+=k;
 230                 er1= &(s->s3->server_random[0]);
 231                 er2= &(s->s3->client_random[0]);
 232                 }
 233
 234         if (n > s->s3->tmp.key_block_length)
 235                 {
 236                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 237                 goto err2;
 238                 }
 239
 240         memcpy(mac_secret,ms,i);
 241         if (exp)
 242                 {
 243                 /* In here I set both the read and write key/iv to the
 244                  * same value since only the correct one will be used :-).
 245                  */
 246                 MD5_Init(&md);
 247                 MD5_Update(&md,key,j);
 248                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 249                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 250                 MD5_Final(&(exp_key[0]),&md);
 251                 key= &(exp_key[0]);
 252
 253                 if (k > 0)
 254                         {
 255                         MD5_Init(&md);
 256                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 257                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 258                         MD5_Final(&(exp_iv[0]),&md);
 259                         iv= &(exp_iv[0]);
 260                         }
 261                 }
 262
 263         s->session->key_arg_length=0;
 264
 265         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 266
 267         memset(&(exp_key[0]),0,sizeof(exp_key));
 268         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 269         return(1);
 270 err:
 271         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 272 err2:
 273         return(0);
 274         }
 275
 276 int ssl3_setup_key_block(SSL *s)
 277         {
 278         unsigned char *p;
 279         const EVP_CIPHER *c;
 280         const EVP_MD *hash;
 281         int num;
 282         SSL_COMP *comp;
 283
 284         if (s->s3->tmp.key_block_length != 0)
 285                 return(1);
 286
 287         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 288                 {
 289                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 290                 return(0);
 291                 }
 292
 293         s->s3->tmp.new_sym_enc=c;
 294         s->s3->tmp.new_hash=hash;
 295         s->s3->tmp.new_compression=comp;
 296
 297         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 298         num*=2;
 299
 300         ssl3_cleanup_key_block(s);
 301
 302         if ((p=(unsigned char *)Malloc(num)) == NULL)
 303                 goto err;
 304
 305         s->s3->tmp.key_block_length=num;
 306         s->s3->tmp.key_block=p;
 307
 308         ssl3_generate_key_block(s,p,num);
 309
 310         return(1);
 311 err:
 312         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 313         return(0);
 314         }
 315
 316 void ssl3_cleanup_key_block(SSL *s)
 317         {
 318         if (s->s3->tmp.key_block != NULL)
 319                 {
 320                 memset(s->s3->tmp.key_block,0,
 321                         s->s3->tmp.key_block_length);
 322                 Free(s->s3->tmp.key_block);
 323                 s->s3->tmp.key_block=NULL;
 324                 }
 325         s->s3->tmp.key_block_length=0;
 326         }
 327
 328 int ssl3_enc(SSL *s, int send)
 329         {
 330         SSL3_RECORD *rec;
 331         EVP_CIPHER_CTX *ds;
 332         unsigned long l;
 333         int bs,i;
 334         const EVP_CIPHER *enc;
 335
 336         if (send)
 337                 {
 338                 ds=s->enc_write_ctx;
 339                 rec= &(s->s3->wrec);
 340                 if (s->enc_write_ctx == NULL)
 341                         enc=NULL;
 342                 else
 343                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 344                 }
 345         else
 346                 {
 347                 ds=s->enc_read_ctx;
 348                 rec= &(s->s3->rrec);
 349                 if (s->enc_read_ctx == NULL)
 350                         enc=NULL;
 351                 else
 352                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 353                 }
 354
 355         if ((s->session == NULL) || (ds == NULL) ||
 356                 (enc == NULL))
 357                 {
 358                 memcpy(rec->data,rec->input,rec->length);
 359                 rec->input=rec->data;
 360                 }
 361         else
 362                 {
 363                 l=rec->length;
 364                 bs=EVP_CIPHER_block_size(ds->cipher);
 365
 366                 /* COMPRESS */
 367
 368                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 369                 if ((bs != 1) && send)
 370                         {
 371                         i=bs-((int)l%bs);
 372
 373                         /* we need to add 'i-1' padding bytes */
 374                         l+=i;
 375                         rec->length+=i;
 376                         rec->input[l-1]=(i-1);
 377                         }
 378
 379                 EVP_Cipher(ds,rec->data,rec->input,l);
 380
 381                 if ((bs != 1) && !send)
 382                         {
 383                         i=rec->data[l-1]+1;
 384                         if (i > bs)
 385                                 {
 386                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 387                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 388                                 return(0);
 389                                 }
 390                         rec->length-=i;
 391                         }
 392                 }
 393         return(1);
 394         }
 395
 396 void ssl3_init_finished_mac(SSL *s)
 397         {
 398         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 399         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 400         }
 401
 402 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 403         {
 404         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 405         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 406         }
 407
 408 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 409         {
 410         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 411         }
 412
 413 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 414              unsigned char *sender, int len, unsigned char *p)
 415         {
 416         int ret;
 417
 418         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 419         p+=ret;
 420         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 421         return(ret);
 422         }
 423
 424 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 425              unsigned char *sender, int len, unsigned char *p)
 426         {
 427         unsigned int ret;
 428         int npad,n;
 429         unsigned int i;
 430         unsigned char md_buf[EVP_MAX_MD_SIZE];
 431         EVP_MD_CTX ctx;
 432
 433         EVP_MD_CTX_copy(&ctx,in_ctx);
 434
 435         n=EVP_MD_CTX_size(&ctx);
 436         npad=(48/n)*n;
 437
 438         if (sender != NULL)
 439                 EVP_DigestUpdate(&ctx,sender,len);
 440         EVP_DigestUpdate(&ctx,s->session->master_key,
 441                 s->session->master_key_length);
 442         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 443         EVP_DigestFinal(&ctx,md_buf,&i);
 444
 445         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
 446         EVP_DigestUpdate(&ctx,s->session->master_key,
 447                 s->session->master_key_length);
 448         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 449         EVP_DigestUpdate(&ctx,md_buf,i);
 450         EVP_DigestFinal(&ctx,p,&ret);
 451
 452         memset(&ctx,0,sizeof(EVP_MD_CTX));
 453
 454         return((int)ret);
 455         }
 456
 457 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 458         {
 459         SSL3_RECORD *rec;
 460         unsigned char *mac_sec,*seq;
 461         EVP_MD_CTX md_ctx;
 462         const EVP_MD *hash;
 463         unsigned char *p,rec_char;
 464         unsigned int md_size;
 465         int npad,i;
 466
 467         if (send)
 468                 {
 469                 rec= &(ssl->s3->wrec);
 470                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 471                 seq= &(ssl->s3->write_sequence[0]);
 472                 hash=ssl->write_hash;
 473                 }
 474         else
 475                 {
 476                 rec= &(ssl->s3->rrec);
 477                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 478                 seq= &(ssl->s3->read_sequence[0]);
 479                 hash=ssl->read_hash;
 480                 }
 481
 482         md_size=EVP_MD_size(hash);
 483         npad=(48/md_size)*md_size;
 484
 485         /* Chop the digest off the end :-) */
 486
 487         EVP_DigestInit(  &md_ctx,hash);
 488         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 489         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 490         EVP_DigestUpdate(&md_ctx,seq,8);
 491         rec_char=rec->type;
 492         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 493         p=md;
 494         s2n(rec->length,p);
 495         EVP_DigestUpdate(&md_ctx,md,2);
 496         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 497         EVP_DigestFinal( &md_ctx,md,NULL);
 498
 499         EVP_DigestInit(  &md_ctx,hash);
 500         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 501         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 502         EVP_DigestUpdate(&md_ctx,md,md_size);
 503         EVP_DigestFinal( &md_ctx,md,&md_size);
 504
 505         for (i=7; i>=0; i--)
 506                 if (++seq[i]) break;
 507
 508         return(md_size);
 509         }
 510
 511 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 512              int len)
 513         {
 514         static const unsigned char *salt[3]={
 515                 (const unsigned char *)"A",
 516                 (const unsigned char *)"BB",
 517                 (const unsigned char *)"CCC",
 518                 };
 519         unsigned char buf[EVP_MAX_MD_SIZE];
 520         EVP_MD_CTX ctx;
 521         int i,ret=0;
 522         unsigned int n;
 523
 524         for (i=0; i<3; i++)
 525                 {
 526                 EVP_DigestInit(&ctx,s->ctx->sha1);
 527                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 528                 EVP_DigestUpdate(&ctx,p,len);
 529                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 530                         SSL3_RANDOM_SIZE);
 531                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 532                         SSL3_RANDOM_SIZE);
 533                 EVP_DigestFinal(&ctx,buf,&n);
 534
 535                 EVP_DigestInit(&ctx,s->ctx->md5);
 536                 EVP_DigestUpdate(&ctx,p,len);
 537                 EVP_DigestUpdate(&ctx,buf,n);
 538                 EVP_DigestFinal(&ctx,out,&n);
 539                 out+=n;
 540                 ret+=n;
 541                 }
 542         return(ret);
 543         }
 544
 545 int ssl3_alert_code(int code)
 546         {
 547         switch (code)
 548                 {
 549         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 550         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 551         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 552         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 553         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 554         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 555         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 556         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 557         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 558         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 559         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 560         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 561         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 562         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 563         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 564         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 565         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 566         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 567         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
 568         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 569         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 570         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 571         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
 572         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 573         default:                        return(-1);
 574                 }
 575         }
 576