ssl/s3_enc.c

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