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 #ifndef NO_PROTO
  82 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
  83         unsigned char *sender, int len, unsigned char *p);
  84 #else
  85 static int ssl3_handshake_mac();
  86 #endif
  87
  88 static void ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
  89         {
  90         MD5_CTX m5;
  91         SHA_CTX s1;
  92         unsigned char buf[8],smd[SHA_DIGEST_LENGTH];
  93         unsigned char c='A';
  94         int i,j,k;
  95
  96         k=0;
  97         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
  98                 {
  99                 k++;
 100                 for (j=0; j<k; j++)
 101                         buf[j]=c;
 102                 c++;
 103                 SHA1_Init(  &s1);
 104                 SHA1_Update(&s1,buf,k);
 105                 SHA1_Update(&s1,s->session->master_key,
 106                         s->session->master_key_length);
 107                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 108                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 109                 SHA1_Final( smd,&s1);
 110
 111                 MD5_Init(  &m5);
 112                 MD5_Update(&m5,s->session->master_key,
 113                         s->session->master_key_length);
 114                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
 115                 if ((i+MD5_DIGEST_LENGTH) > num)
 116                         {
 117                         MD5_Final(smd,&m5);
 118                         memcpy(km,smd,(num-i));
 119                         }
 120                 else
 121                         MD5_Final(km,&m5);
 122
 123                 km+=MD5_DIGEST_LENGTH;
 124                 }
 125         memset(smd,0,SHA_DIGEST_LENGTH);
 126         }
 127
 128 int ssl3_change_cipher_state(SSL *s, int which)
 129         {
 130         unsigned char *p,*key_block,*mac_secret;
 131         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 132         unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
 133         unsigned char *ms,*key,*iv,*er1,*er2;
 134         EVP_CIPHER_CTX *dd;
 135         const EVP_CIPHER *c;
 136         COMP_METHOD *comp;
 137         const EVP_MD *m;
 138         MD5_CTX md;
 139         int exp,n,i,j,k,cl;
 140
 141         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 142         c=s->s3->tmp.new_sym_enc;
 143         m=s->s3->tmp.new_hash;
 144         if (s->s3->tmp.new_compression == NULL)
 145                 comp=NULL;
 146         else
 147                 comp=s->s3->tmp.new_compression->method;
 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                 /* COMPRESS */
 159                 if (s->expand != NULL)
 160                         {
 161                         COMP_CTX_free(s->expand);
 162                         s->expand=NULL;
 163                         }
 164                 if (comp != NULL)
 165                         {
 166                         s->expand=COMP_CTX_new(comp);
 167                         if (s->expand == NULL)
 168                                 {
 169                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 170                                 goto err2;
 171                                 }
 172                         if (s->s3->rrec.comp == NULL)
 173                                 s->s3->rrec.comp=(unsigned char *)
 174                                         Malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 175                         if (s->s3->rrec.comp == NULL)
 176                                 goto err;
 177                         }
 178                 memset(&(s->s3->read_sequence[0]),0,8);
 179                 mac_secret= &(s->s3->read_mac_secret[0]);
 180                 }
 181         else
 182                 {
 183                 if ((s->enc_write_ctx == NULL) &&
 184                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 185                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 186                         goto err;
 187                 dd= s->enc_write_ctx;
 188                 s->write_hash=m;
 189                 /* COMPRESS */
 190                 if (s->compress != NULL)
 191                         {
 192                         COMP_CTX_free(s->compress);
 193                         s->compress=NULL;
 194                         }
 195                 if (comp != NULL)
 196                         {
 197                         s->compress=COMP_CTX_new(comp);
 198                         if (s->compress == NULL)
 199                                 {
 200                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 201                                 goto err2;
 202                                 }
 203                         }
 204                 memset(&(s->s3->write_sequence[0]),0,8);
 205                 mac_secret= &(s->s3->write_mac_secret[0]);
 206                 }
 207
 208         EVP_CIPHER_CTX_init(dd);
 209
 210         p=s->s3->tmp.key_block;
 211         i=EVP_MD_size(m);
 212         cl=EVP_CIPHER_key_length(c);
 213         j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 214                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 215         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 216         k=EVP_CIPHER_iv_length(c);
 217         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 218                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 219                 {
 220                 ms=  &(p[ 0]); n=i+i;
 221                 key= &(p[ n]); n+=j+j;
 222                 iv=  &(p[ n]); n+=k+k;
 223                 er1= &(s->s3->client_random[0]);
 224                 er2= &(s->s3->server_random[0]);
 225                 }
 226         else
 227                 {
 228                 n=i;
 229                 ms=  &(p[ n]); n+=i+j;
 230                 key= &(p[ n]); n+=j+k;
 231                 iv=  &(p[ n]); n+=k;
 232                 er1= &(s->s3->server_random[0]);
 233                 er2= &(s->s3->client_random[0]);
 234                 }
 235
 236         if (n > s->s3->tmp.key_block_length)
 237                 {
 238                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 239                 goto err2;
 240                 }
 241
 242         memcpy(mac_secret,ms,i);
 243         if (exp)
 244                 {
 245                 /* In here I set both the read and write key/iv to the
 246                  * same value since only the correct one will be used :-).
 247                  */
 248                 MD5_Init(&md);
 249                 MD5_Update(&md,key,j);
 250                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 251                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 252                 MD5_Final(&(exp_key[0]),&md);
 253                 key= &(exp_key[0]);
 254
 255                 if (k > 0)
 256                         {
 257                         MD5_Init(&md);
 258                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 259                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 260                         MD5_Final(&(exp_iv[0]),&md);
 261                         iv= &(exp_iv[0]);
 262                         }
 263                 }
 264
 265         s->session->key_arg_length=0;
 266
 267         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 268
 269         memset(&(exp_key[0]),0,sizeof(exp_key));
 270         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 271         return(1);
 272 err:
 273         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 274 err2:
 275         return(0);
 276         }
 277
 278 int ssl3_setup_key_block(SSL *s)
 279         {
 280         unsigned char *p;
 281         const EVP_CIPHER *c;
 282         const EVP_MD *hash;
 283         int num;
 284         SSL_COMP *comp;
 285
 286         if (s->s3->tmp.key_block_length != 0)
 287                 return(1);
 288
 289         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 290                 {
 291                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 292                 return(0);
 293                 }
 294
 295         s->s3->tmp.new_sym_enc=c;
 296         s->s3->tmp.new_hash=hash;
 297         s->s3->tmp.new_compression=comp;
 298
 299         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 300         num*=2;
 301
 302         ssl3_cleanup_key_block(s);
 303
 304         if ((p=(unsigned char *)Malloc(num)) == NULL)
 305                 goto err;
 306
 307         s->s3->tmp.key_block_length=num;
 308         s->s3->tmp.key_block=p;
 309
 310         ssl3_generate_key_block(s,p,num);
 311
 312         return(1);
 313 err:
 314         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 315         return(0);
 316         }
 317
 318 void ssl3_cleanup_key_block(SSL *s)
 319         {
 320         if (s->s3->tmp.key_block != NULL)
 321                 {
 322                 memset(s->s3->tmp.key_block,0,
 323                         s->s3->tmp.key_block_length);
 324                 Free(s->s3->tmp.key_block);
 325                 s->s3->tmp.key_block=NULL;
 326                 }
 327         s->s3->tmp.key_block_length=0;
 328         }
 329
 330 int ssl3_enc(SSL *s, int send)
 331         {
 332         SSL3_RECORD *rec;
 333         EVP_CIPHER_CTX *ds;
 334         unsigned long l;
 335         int bs,i;
 336         const EVP_CIPHER *enc;
 337
 338         if (send)
 339                 {
 340                 ds=s->enc_write_ctx;
 341                 rec= &(s->s3->wrec);
 342                 if (s->enc_write_ctx == NULL)
 343                         enc=NULL;
 344                 else
 345                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 346                 }
 347         else
 348                 {
 349                 ds=s->enc_read_ctx;
 350                 rec= &(s->s3->rrec);
 351                 if (s->enc_read_ctx == NULL)
 352                         enc=NULL;
 353                 else
 354                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 355                 }
 356
 357         if ((s->session == NULL) || (ds == NULL) ||
 358                 (enc == NULL))
 359                 {
 360                 memcpy(rec->data,rec->input,rec->length);
 361                 rec->input=rec->data;
 362                 }
 363         else
 364                 {
 365                 l=rec->length;
 366                 bs=EVP_CIPHER_block_size(ds->cipher);
 367
 368                 /* COMPRESS */
 369
 370                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 371                 if ((bs != 1) && send)
 372                         {
 373                         i=bs-((int)l%bs);
 374
 375                         /* we need to add 'i-1' padding bytes */
 376                         l+=i;
 377                         rec->length+=i;
 378                         rec->input[l-1]=(i-1);
 379                         }
 380
 381                 EVP_Cipher(ds,rec->data,rec->input,l);
 382
 383                 if ((bs != 1) && !send)
 384                         {
 385                         i=rec->data[l-1]+1;
 386                         if (i > bs)
 387                                 {
 388                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 389                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 390                                 return(0);
 391                                 }
 392                         rec->length-=i;
 393                         }
 394                 }
 395         return(1);
 396         }
 397
 398 void ssl3_init_finished_mac(SSL *s)
 399         {
 400         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 401         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 402         }
 403
 404 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 405         {
 406         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 407         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 408         }
 409
 410 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 411         {
 412         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 413         }
 414
 415 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 416              unsigned char *sender, int len, unsigned char *p)
 417         {
 418         int ret;
 419
 420         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 421         p+=ret;
 422         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 423         return(ret);
 424         }
 425
 426 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 427              unsigned char *sender, int len, unsigned char *p)
 428         {
 429         unsigned int ret;
 430         int npad,n;
 431         unsigned int i;
 432         unsigned char md_buf[EVP_MAX_MD_SIZE];
 433         EVP_MD_CTX ctx;
 434
 435         EVP_MD_CTX_copy(&ctx,in_ctx);
 436
 437         n=EVP_MD_CTX_size(&ctx);
 438         npad=(48/n)*n;
 439
 440         if (sender != NULL)
 441                 EVP_DigestUpdate(&ctx,sender,len);
 442         EVP_DigestUpdate(&ctx,s->session->master_key,
 443                 s->session->master_key_length);
 444         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 445         EVP_DigestFinal(&ctx,md_buf,&i);
 446
 447         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
 448         EVP_DigestUpdate(&ctx,s->session->master_key,
 449                 s->session->master_key_length);
 450         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 451         EVP_DigestUpdate(&ctx,md_buf,i);
 452         EVP_DigestFinal(&ctx,p,&ret);
 453
 454         memset(&ctx,0,sizeof(EVP_MD_CTX));
 455
 456         return((int)ret);
 457         }
 458
 459 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 460         {
 461         SSL3_RECORD *rec;
 462         unsigned char *mac_sec,*seq;
 463         EVP_MD_CTX md_ctx;
 464         const EVP_MD *hash;
 465         unsigned char *p,rec_char;
 466         unsigned int md_size;
 467         int npad,i;
 468
 469         if (send)
 470                 {
 471                 rec= &(ssl->s3->wrec);
 472                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 473                 seq= &(ssl->s3->write_sequence[0]);
 474                 hash=ssl->write_hash;
 475                 }
 476         else
 477                 {
 478                 rec= &(ssl->s3->rrec);
 479                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 480                 seq= &(ssl->s3->read_sequence[0]);
 481                 hash=ssl->read_hash;
 482                 }
 483
 484         md_size=EVP_MD_size(hash);
 485         npad=(48/md_size)*md_size;
 486
 487         /* Chop the digest off the end :-) */
 488
 489         EVP_DigestInit(  &md_ctx,hash);
 490         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 491         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 492         EVP_DigestUpdate(&md_ctx,seq,8);
 493         rec_char=rec->type;
 494         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 495         p=md;
 496         s2n(rec->length,p);
 497         EVP_DigestUpdate(&md_ctx,md,2);
 498         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 499         EVP_DigestFinal( &md_ctx,md,NULL);
 500
 501         EVP_DigestInit(  &md_ctx,hash);
 502         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 503         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 504         EVP_DigestUpdate(&md_ctx,md,md_size);
 505         EVP_DigestFinal( &md_ctx,md,&md_size);
 506
 507         for (i=7; i>=0; i--)
 508                 if (++seq[i]) break;
 509
 510         return(md_size);
 511         }
 512
 513 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 514              int len)
 515         {
 516         static const unsigned char *salt[3]={
 517                 (const unsigned char *)"A",
 518                 (const unsigned char *)"BB",
 519                 (const unsigned char *)"CCC",
 520                 };
 521         unsigned char buf[EVP_MAX_MD_SIZE];
 522         EVP_MD_CTX ctx;
 523         int i,ret=0;
 524         unsigned int n;
 525
 526         for (i=0; i<3; i++)
 527                 {
 528                 EVP_DigestInit(&ctx,s->ctx->sha1);
 529                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 530                 EVP_DigestUpdate(&ctx,p,len);
 531                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 532                         SSL3_RANDOM_SIZE);
 533                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 534                         SSL3_RANDOM_SIZE);
 535                 EVP_DigestFinal(&ctx,buf,&n);
 536
 537                 EVP_DigestInit(&ctx,s->ctx->md5);
 538                 EVP_DigestUpdate(&ctx,p,len);
 539                 EVP_DigestUpdate(&ctx,buf,n);
 540                 EVP_DigestFinal(&ctx,out,&n);
 541                 out+=n;
 542                 ret+=n;
 543                 }
 544         return(ret);
 545         }
 546
 547 int ssl3_alert_code(int code)
 548         {
 549         switch (code)
 550                 {
 551         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 552         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 553         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 554         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 555         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 556         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 557         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 558         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 559         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 560         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 561         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 562         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 563         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 564         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 565         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 566         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 567         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 568         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 569         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
 570         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 571         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 572         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 573         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
 574         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 575         default:                        return(-1);
 576                 }
 577         }
 578