1ce1c161ec66d1d775e80d3eb7ffa783aa93856b
[openssl.git] / 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         unsigned 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=(unsigned char *)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              unsigned 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_type(&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_RESTRICION:  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_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
579         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
580         default:                        return(-1);
581                 }
582         }
583