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 #ifdef CHARSET_EBCDIC
  97         c = os_toascii[c]; /*'A' in ASCII */
  98 #endif
  99         k=0;
 100         for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
 101                 {
 102                 k++;
 103                 for (j=0; j<k; j++)
 104                         buf[j]=c;
 105                 c++;
 106                 SHA1_Init(  &s1);
 107                 SHA1_Update(&s1,buf,k);
 108                 SHA1_Update(&s1,s->session->master_key,
 109                         s->session->master_key_length);
 110                 SHA1_Update(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 111                 SHA1_Update(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 112                 SHA1_Final( smd,&s1);
 113
 114                 MD5_Init(  &m5);
 115                 MD5_Update(&m5,s->session->master_key,
 116                         s->session->master_key_length);
 117                 MD5_Update(&m5,smd,SHA_DIGEST_LENGTH);
 118                 if ((i+MD5_DIGEST_LENGTH) > num)
 119                         {
 120                         MD5_Final(smd,&m5);
 121                         memcpy(km,smd,(num-i));
 122                         }
 123                 else
 124                         MD5_Final(km,&m5);
 125
 126                 km+=MD5_DIGEST_LENGTH;
 127                 }
 128         memset(smd,0,SHA_DIGEST_LENGTH);
 129         }
 130
 131 int ssl3_change_cipher_state(SSL *s, 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         const EVP_CIPHER *c;
 139         COMP_METHOD *comp;
 140         const EVP_MD *m;
 141         MD5_CTX md;
 142         int exp,n,i,j,k,cl;
 143
 144         exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 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 < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 217                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 218         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 219         k=EVP_CIPHER_iv_length(c);
 220         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 221                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 222                 {
 223                 ms=  &(p[ 0]); n=i+i;
 224                 key= &(p[ n]); n+=j+j;
 225                 iv=  &(p[ n]); n+=k+k;
 226                 er1= &(s->s3->client_random[0]);
 227                 er2= &(s->s3->server_random[0]);
 228                 }
 229         else
 230                 {
 231                 n=i;
 232                 ms=  &(p[ n]); n+=i+j;
 233                 key= &(p[ n]); n+=j+k;
 234                 iv=  &(p[ n]); n+=k;
 235                 er1= &(s->s3->server_random[0]);
 236                 er2= &(s->s3->client_random[0]);
 237                 }
 238
 239         if (n > s->s3->tmp.key_block_length)
 240                 {
 241                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
 242                 goto err2;
 243                 }
 244
 245         memcpy(mac_secret,ms,i);
 246         if (exp)
 247                 {
 248                 /* In here I set both the read and write key/iv to the
 249                  * same value since only the correct one will be used :-).
 250                  */
 251                 MD5_Init(&md);
 252                 MD5_Update(&md,key,j);
 253                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 254                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 255                 MD5_Final(&(exp_key[0]),&md);
 256                 key= &(exp_key[0]);
 257
 258                 if (k > 0)
 259                         {
 260                         MD5_Init(&md);
 261                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
 262                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
 263                         MD5_Final(&(exp_iv[0]),&md);
 264                         iv= &(exp_iv[0]);
 265                         }
 266                 }
 267
 268         s->session->key_arg_length=0;
 269
 270         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
 271
 272         memset(&(exp_key[0]),0,sizeof(exp_key));
 273         memset(&(exp_iv[0]),0,sizeof(exp_iv));
 274         return(1);
 275 err:
 276         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 277 err2:
 278         return(0);
 279         }
 280
 281 int ssl3_setup_key_block(SSL *s)
 282         {
 283         unsigned char *p;
 284         const EVP_CIPHER *c;
 285         const EVP_MD *hash;
 286         int num;
 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         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 303         num*=2;
 304
 305         ssl3_cleanup_key_block(s);
 306
 307         if ((p=(unsigned char *)Malloc(num)) == NULL)
 308                 goto err;
 309
 310         s->s3->tmp.key_block_length=num;
 311         s->s3->tmp.key_block=p;
 312
 313         ssl3_generate_key_block(s,p,num);
 314
 315         return(1);
 316 err:
 317         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 318         return(0);
 319         }
 320
 321 void ssl3_cleanup_key_block(SSL *s)
 322         {
 323         if (s->s3->tmp.key_block != NULL)
 324                 {
 325                 memset(s->s3->tmp.key_block,0,
 326                         s->s3->tmp.key_block_length);
 327                 Free(s->s3->tmp.key_block);
 328                 s->s3->tmp.key_block=NULL;
 329                 }
 330         s->s3->tmp.key_block_length=0;
 331         }
 332
 333 int ssl3_enc(SSL *s, int send)
 334         {
 335         SSL3_RECORD *rec;
 336         EVP_CIPHER_CTX *ds;
 337         unsigned long l;
 338         int bs,i;
 339         const EVP_CIPHER *enc;
 340
 341         if (send)
 342                 {
 343                 ds=s->enc_write_ctx;
 344                 rec= &(s->s3->wrec);
 345                 if (s->enc_write_ctx == NULL)
 346                         enc=NULL;
 347                 else
 348                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 349                 }
 350         else
 351                 {
 352                 ds=s->enc_read_ctx;
 353                 rec= &(s->s3->rrec);
 354                 if (s->enc_read_ctx == NULL)
 355                         enc=NULL;
 356                 else
 357                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 358                 }
 359
 360         if ((s->session == NULL) || (ds == NULL) ||
 361                 (enc == NULL))
 362                 {
 363                 memcpy(rec->data,rec->input,rec->length);
 364                 rec->input=rec->data;
 365                 }
 366         else
 367                 {
 368                 l=rec->length;
 369                 bs=EVP_CIPHER_block_size(ds->cipher);
 370
 371                 /* COMPRESS */
 372
 373                 /* This should be using (bs-1) and bs instead of 7 and 8 */
 374                 if ((bs != 1) && send)
 375                         {
 376                         i=bs-((int)l%bs);
 377
 378                         /* we need to add 'i-1' padding bytes */
 379                         l+=i;
 380                         rec->length+=i;
 381                         rec->input[l-1]=(i-1);
 382                         }
 383
 384                 EVP_Cipher(ds,rec->data,rec->input,l);
 385
 386                 if ((bs != 1) && !send)
 387                         {
 388                         i=rec->data[l-1]+1;
 389                         if (i > bs)
 390                                 {
 391                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 392                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
 393                                 return(0);
 394                                 }
 395                         rec->length-=i;
 396                         }
 397                 }
 398         return(1);
 399         }
 400
 401 void ssl3_init_finished_mac(SSL *s)
 402         {
 403         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
 404         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
 405         }
 406
 407 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 408         {
 409         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 410         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 411         }
 412
 413 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 414         {
 415         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 416         }
 417
 418 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 419              unsigned char *sender, int len, unsigned char *p)
 420         {
 421         int ret;
 422
 423         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 424         p+=ret;
 425         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 426         return(ret);
 427         }
 428
 429 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 430              unsigned char *sender, int len, unsigned char *p)
 431         {
 432         unsigned int ret;
 433         int npad,n;
 434         unsigned int i;
 435         unsigned char md_buf[EVP_MAX_MD_SIZE];
 436         EVP_MD_CTX ctx;
 437
 438         EVP_MD_CTX_copy(&ctx,in_ctx);
 439
 440         n=EVP_MD_CTX_size(&ctx);
 441         npad=(48/n)*n;
 442
 443         if (sender != NULL)
 444                 EVP_DigestUpdate(&ctx,sender,len);
 445         EVP_DigestUpdate(&ctx,s->session->master_key,
 446                 s->session->master_key_length);
 447         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 448         EVP_DigestFinal(&ctx,md_buf,&i);
 449
 450         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
 451         EVP_DigestUpdate(&ctx,s->session->master_key,
 452                 s->session->master_key_length);
 453         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 454         EVP_DigestUpdate(&ctx,md_buf,i);
 455         EVP_DigestFinal(&ctx,p,&ret);
 456
 457         memset(&ctx,0,sizeof(EVP_MD_CTX));
 458
 459         return((int)ret);
 460         }
 461
 462 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 463         {
 464         SSL3_RECORD *rec;
 465         unsigned char *mac_sec,*seq;
 466         EVP_MD_CTX md_ctx;
 467         const EVP_MD *hash;
 468         unsigned char *p,rec_char;
 469         unsigned int md_size;
 470         int npad,i;
 471
 472         if (send)
 473                 {
 474                 rec= &(ssl->s3->wrec);
 475                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 476                 seq= &(ssl->s3->write_sequence[0]);
 477                 hash=ssl->write_hash;
 478                 }
 479         else
 480                 {
 481                 rec= &(ssl->s3->rrec);
 482                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 483                 seq= &(ssl->s3->read_sequence[0]);
 484                 hash=ssl->read_hash;
 485                 }
 486
 487         md_size=EVP_MD_size(hash);
 488         npad=(48/md_size)*md_size;
 489
 490         /* Chop the digest off the end :-) */
 491
 492         EVP_DigestInit(  &md_ctx,hash);
 493         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 494         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 495         EVP_DigestUpdate(&md_ctx,seq,8);
 496         rec_char=rec->type;
 497         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 498         p=md;
 499         s2n(rec->length,p);
 500         EVP_DigestUpdate(&md_ctx,md,2);
 501         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 502         EVP_DigestFinal( &md_ctx,md,NULL);
 503
 504         EVP_DigestInit(  &md_ctx,hash);
 505         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 506         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 507         EVP_DigestUpdate(&md_ctx,md,md_size);
 508         EVP_DigestFinal( &md_ctx,md,&md_size);
 509
 510         for (i=7; i>=0; i--)
 511                 if (++seq[i]) break;
 512
 513         return(md_size);
 514         }
 515
 516 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 517              int len)
 518         {
 519         static const unsigned char *salt[3]={
 520 #ifndef CHARSET_EBCDIC
 521                 (const unsigned char *)"A",
 522                 (const unsigned char *)"BB",
 523                 (const unsigned char *)"CCC",
 524 #else
 525                 (const unsigned char *)"\x41",
 526                 (const unsigned char *)"\x42\x42",
 527                 (const unsigned char *)"\x43\x43\x43",
 528 #endif
 529                 };
 530         unsigned char buf[EVP_MAX_MD_SIZE];
 531         EVP_MD_CTX ctx;
 532         int i,ret=0;
 533         unsigned int n;
 534
 535         for (i=0; i<3; i++)
 536                 {
 537                 EVP_DigestInit(&ctx,s->ctx->sha1);
 538                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 539                 EVP_DigestUpdate(&ctx,p,len);
 540                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 541                         SSL3_RANDOM_SIZE);
 542                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 543                         SSL3_RANDOM_SIZE);
 544                 EVP_DigestFinal(&ctx,buf,&n);
 545
 546                 EVP_DigestInit(&ctx,s->ctx->md5);
 547                 EVP_DigestUpdate(&ctx,p,len);
 548                 EVP_DigestUpdate(&ctx,buf,n);
 549                 EVP_DigestFinal(&ctx,out,&n);
 550                 out+=n;
 551                 ret+=n;
 552                 }
 553         return(ret);
 554         }
 555
 556 int ssl3_alert_code(int code)
 557         {
 558         switch (code)
 559                 {
 560         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 561         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 562         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 563         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 564         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 565         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 566         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 567         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 568         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 569         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 570         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 571         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 572         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 573         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 574         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 575         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 576         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 577         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 578         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
 579         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 580         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 581         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 582         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
 583         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 584         default:                        return(-1);
 585                 }
 586         }
 587