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         COMP_METHOD *comp;
 140         EVP_MD *m;
 141         MD5_CTX md;
 142         int exp,n,i,j,k,cl;
 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         if (s->s3->tmp.new_compression == NULL)
 148                 comp=NULL;
 149         else
 150                 comp=s->s3->tmp.new_compression->method;
 151         key_block=s->s3->tmp.key_block;
 152
 153         if (which & SSL3_CC_READ)
 154                 {
 155                 if ((s->enc_read_ctx == NULL) &&
 156                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
 157                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 158                         goto err;
 159                 dd= s->enc_read_ctx;
 160                 s->read_hash=m;
 161                 /* COMPRESS */
 162                 if (s->expand != NULL)
 163                         {
 164                         COMP_CTX_free(s->expand);
 165                         s->expand=NULL;
 166                         }
 167                 if (comp != NULL)
 168                         {
 169                         s->expand=COMP_CTX_new(comp);
 170                         if (s->expand == NULL)
 171                                 {
 172                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 173                                 goto err2;
 174                                 }
 175                         if (s->s3->rrec.comp == NULL)
 176                                 s->s3->rrec.comp=(unsigned char *)
 177                                         Malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 178                         if (s->s3->rrec.comp == NULL)
 179                                 goto err;
 180                         }
 181                 memset(&(s->s3->read_sequence[0]),0,8);
 182                 mac_secret= &(s->s3->read_mac_secret[0]);
 183                 }
 184         else
 185                 {
 186                 if ((s->enc_write_ctx == NULL) &&
 187                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
 188                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
 189                         goto err;
 190                 dd= s->enc_write_ctx;
 191                 s->write_hash=m;
 192                 /* COMPRESS */
 193                 if (s->compress != NULL)
 194                         {
 195                         COMP_CTX_free(s->compress);
 196                         s->compress=NULL;
 197                         }
 198                 if (comp != NULL)
 199                         {
 200                         s->compress=COMP_CTX_new(comp);
 201                         if (s->compress == NULL)
 202                                 {
 203                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 204                                 goto err2;
 205                                 }
 206                         }
 207                 memset(&(s->s3->write_sequence[0]),0,8);
 208                 mac_secret= &(s->s3->write_mac_secret[0]);
 209                 }
 210
 211         EVP_CIPHER_CTX_init(dd);
 212
 213         p=s->s3->tmp.key_block;
 214         i=EVP_MD_size(m);
 215         cl=EVP_CIPHER_key_length(c);
 216         j=exp ? (cl < 5 ? cl : 5) : cl;
 217         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 218         k=EVP_CIPHER_iv_length(c);
 219         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 220                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 221                 {
 222                 ms=  &(p[ 0]); n=i+i;
 223                 key= &(p[ n]); n+=j+j;
 224                 iv=  &(p[ n]); n+=k+k;
 225                 er1= &(s->s3->client_random[0]);
 226                 er2= &(s->s3->server_random[0]);
 227                 }
 228         else
 229                 {
 230                 n=i;
 231                 ms=  &(p[ n]); n+=i+j;
 232                 key= &(p[ n]); n+=j+k;
 233                 iv=  &(p[ n]); n+=k;
 234                 er1= &(s->s3->server_random[0]);
 235                 er2= &(s->s3->client_random[0]);
 236                 }
 237
 238         if (n > s->s3->tmp.key_block_length)
 239                 {
 240                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 241                 goto err2;
 242                 }
 243
 244         memcpy(mac_secret,ms,i);
 245         if (exp)
 246                 {
 247                 /* In here I set both the read and write key/iv to the
 248                  * same value since only the correct one will be used :-).
 249                  */
 250                 MD5_Init(&md);
 251                 MD5_Update(&md,key,j);
 252                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 253                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 254                 MD5_Final(&(exp_key[0]),&md);
 255                 key= &(exp_key[0]);
 256
 257                 if (k > 0)
 258                         {
 259                         MD5_Init(&md);
 260                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 261                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 262                         MD5_Final(&(exp_iv[0]),&md);
 263                         iv= &(exp_iv[0]);
 264                         }
 265                 }
 266
 267         s->session->key_arg_length=0;
 268
 269         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 270
 271         memset(&(exp_key[0]),0,sizeof(exp_key));
 272         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 273         return(1);
 274 err:
 275         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 276 err2:
 277         return(0);
 278         }
 279
 280 int ssl3_setup_key_block(s)
 281 SSL *s;
 282         {
 283         unsigned char *p;
 284         EVP_CIPHER *c;
 285         EVP_MD *hash;
 286         int num,exp;
 287         SSL_COMP *comp;
 288
 289         if (s->s3->tmp.key_block_length != 0)
 290                 return(1);
 291
 292         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 293                 {
 294                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 295                 return(0);
 296                 }
 297
 298         s->s3->tmp.new_sym_enc=c;
 299         s->s3->tmp.new_hash=hash;
 300         s->s3->tmp.new_compression=comp;
 301
 302         exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
 303
 304         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 305         num*=2;
 306
 307         ssl3_cleanup_key_block(s);
 308
 309         if ((p=(unsigned char *)Malloc(num)) == NULL)
 310                 goto err;
 311
 312         s->s3->tmp.key_block_length=num;
 313         s->s3->tmp.key_block=p;
 314
 315         ssl3_generate_key_block(s,p,num);
 316
 317         return(1);
 318 err:
 319         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 320         return(0);
 321         }
 322
 323 void ssl3_cleanup_key_block(s)
 324 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                 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(s,send)
 337 SSL *s;
 338 int send;
 339         {
 340         SSL3_RECORD *rec;
 341         EVP_CIPHER_CTX *ds;
 342         unsigned long l;
 343         int bs,i;
 344         EVP_CIPHER *enc;
 345
 346         if (send)
 347                 {
 348                 ds=s->enc_write_ctx;
 349                 rec= &(s->s3->wrec);
 350                 if (s->enc_write_ctx == NULL)
 351                         enc=NULL;
 352                 else
 353                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 354                 }
 355         else
 356                 {
 357                 ds=s->enc_read_ctx;
 358                 rec= &(s->s3->rrec);
 359                 if (s->enc_read_ctx == NULL)
 360                         enc=NULL;
 361                 else
 362                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 363                 }
 364
 365         if ((s->session == NULL) || (ds == NULL) ||
 366                 (enc == NULL))
 367                 {
 368                 memcpy(rec->data,rec->input,rec->length);
 369                 rec->input=rec->data;
 370                 }
 371         else
 372                 {
 373                 l=rec->length;
 374                 bs=EVP_CIPHER_block_size(ds->cipher);
 375
 376                 /* COMPRESS */
 377
 378                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 379                 if ((bs != 1) && send)
 380                         {
 381                         i=bs-((int)l%bs);
 382
 383                         /* we need to add 'i-1' padding bytes */
 384                         l+=i;
 385                         rec->length+=i;
 386                         rec->input[l-1]=(i-1);
 387                         }
 388
 389                 EVP_Cipher(ds,rec->data,rec->input,l);
 390
 391                 if ((bs != 1) && !send)
 392                         {
 393                         i=rec->data[l-1]+1;
 394                         if (i > bs)
 395                                 {
 396                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 397                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 398                                 return(0);
 399                                 }
 400                         rec->length-=i;
 401                         }
 402                 }
 403         return(1);
 404         }
 405
 406 void ssl3_init_finished_mac(s)
 407 SSL *s;
 408         {
 409         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 410         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 411         }
 412
 413 void ssl3_finish_mac(s,buf,len)
 414 SSL *s;
 415 unsigned char *buf;
 416 int len;
 417         {
 418         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 419         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 420         }
 421
 422 int ssl3_cert_verify_mac(s,ctx,p)
 423 SSL *s;
 424 EVP_MD_CTX *ctx;
 425 unsigned char *p;
 426         {
 427         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 428         }
 429
 430 int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
 431 SSL *s;
 432 EVP_MD_CTX *ctx1,*ctx2;
 433 unsigned char *sender;
 434 int len;
 435 unsigned char *p;
 436         {
 437         int ret;
 438
 439         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 440         p+=ret;
 441         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 442         return(ret);
 443         }
 444
 445 static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
 446 SSL *s;
 447 EVP_MD_CTX *in_ctx;
 448 unsigned char *sender;
 449 int len;
 450 unsigned char *p;
 451         {
 452         unsigned int ret;
 453         int npad,n;
 454         unsigned int i;
 455         unsigned char md_buf[EVP_MAX_MD_SIZE];
 456         EVP_MD_CTX ctx;
 457
 458         EVP_MD_CTX_copy(&ctx,in_ctx);
 459
 460         n=EVP_MD_CTX_size(&ctx);
 461         npad=(48/n)*n;
 462
 463         if (sender != NULL)
 464                 EVP_DigestUpdate(&ctx,sender,len);
 465         EVP_DigestUpdate(&ctx,s->session->master_key,
 466                 s->session->master_key_length);
 467         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 468         EVP_DigestFinal(&ctx,md_buf,&i);
 469
 470         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
 471         EVP_DigestUpdate(&ctx,s->session->master_key,
 472                 s->session->master_key_length);
 473         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 474         EVP_DigestUpdate(&ctx,md_buf,i);
 475         EVP_DigestFinal(&ctx,p,&ret);
 476
 477         memset(&ctx,0,sizeof(EVP_MD_CTX));
 478
 479         return((int)ret);
 480         }
 481
 482 int ssl3_mac(ssl,md,send)
 483 SSL *ssl;
 484 unsigned char *md;
 485 int send;
 486         {
 487         SSL3_RECORD *rec;
 488         unsigned char *mac_sec,*seq;
 489         EVP_MD_CTX md_ctx;
 490         EVP_MD *hash;
 491         unsigned char *p,rec_char;
 492         unsigned int md_size;
 493         int npad,i;
 494
 495         if (send)
 496                 {
 497                 rec= &(ssl->s3->wrec);
 498                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 499                 seq= &(ssl->s3->write_sequence[0]);
 500                 hash=ssl->write_hash;
 501                 }
 502         else
 503                 {
 504                 rec= &(ssl->s3->rrec);
 505                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 506                 seq= &(ssl->s3->read_sequence[0]);
 507                 hash=ssl->read_hash;
 508                 }
 509
 510         md_size=EVP_MD_size(hash);
 511         npad=(48/md_size)*md_size;
 512
 513         /* Chop the digest off the end :-) */
 514
 515         EVP_DigestInit(  &md_ctx,hash);
 516         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 517         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 518         EVP_DigestUpdate(&md_ctx,seq,8);
 519         rec_char=rec->type;
 520         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 521         p=md;
 522         s2n(rec->length,p);
 523         EVP_DigestUpdate(&md_ctx,md,2);
 524         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 525         EVP_DigestFinal( &md_ctx,md,NULL);
 526
 527         EVP_DigestInit(  &md_ctx,hash);
 528         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 529         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 530         EVP_DigestUpdate(&md_ctx,md,md_size);
 531         EVP_DigestFinal( &md_ctx,md,&md_size);
 532
 533         for (i=7; i>=0; i--)
 534                 if (++seq[i]) break;
 535
 536         return(md_size);
 537         }
 538
 539 int ssl3_generate_master_secret(s,out,p,len)
 540 SSL *s;
 541 unsigned char *out;
 542 unsigned char *p;
 543 int len;
 544         {
 545         static unsigned char *salt[3]={
 546                 (unsigned char *)"A",
 547                 (unsigned char *)"BB",
 548                 (unsigned char *)"CCC",
 549                 };
 550         unsigned char buf[EVP_MAX_MD_SIZE];
 551         EVP_MD_CTX ctx;
 552         int i,ret=0;
 553         unsigned int n;
 554
 555         for (i=0; i<3; i++)
 556                 {
 557                 EVP_DigestInit(&ctx,s->ctx->sha1);
 558                 EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
 559                 EVP_DigestUpdate(&ctx,p,len);
 560                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 561                         SSL3_RANDOM_SIZE);
 562                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 563                         SSL3_RANDOM_SIZE);
 564                 EVP_DigestFinal(&ctx,buf,&n);
 565
 566                 EVP_DigestInit(&ctx,s->ctx->md5);
 567                 EVP_DigestUpdate(&ctx,p,len);
 568                 EVP_DigestUpdate(&ctx,buf,n);
 569                 EVP_DigestFinal(&ctx,out,&n);
 570                 out+=n;
 571                 ret+=n;
 572                 }
 573         return(ret);
 574         }
 575
 576 int ssl3_alert_code(code)
 577 int code;
 578         {
 579         switch (code)
 580                 {
 581         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 582         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 583         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 584         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 585         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 586         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 587         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 588         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 589         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 590         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 591         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 592         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 593         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 594         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 595         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 596         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 597         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 598         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 599         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
 600         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 601         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 602         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 603         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
 604         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 605         default:                        return(-1);
 606                 }
 607         }
 608