In the absence of feedback either way, commit the fix that looks right for
[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 "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         comp=s->s3->tmp.new_compression;
148         key_block=s->s3->tmp.key_block;
149
150         if (which & SSL3_CC_READ)
151                 {
152                 if ((s->enc_read_ctx == NULL) &&
153                         ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
154                         Malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
155                         goto err;
156                 dd= s->enc_read_ctx;
157                 s->read_hash=m;
158                 /* COMPRESS */
159                 if (s->expand != NULL)
160                         {
161                         COMP_CTX_free(s->expand);
162                         s->expand=NULL;
163                         }
164                 if (comp != NULL)
165                         {
166                         s->expand=COMP_CTX_new(comp);
167                         if (s->expand == NULL)
168                                 {
169                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
170                                 goto err2;
171                                 }
172                         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 < 5 ? cl : 5) : cl;
213         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
214         k=EVP_CIPHER_iv_length(c);
215         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
216                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
217                 {
218                 ms=  &(p[ 0]); n=i+i;
219                 key= &(p[ n]); n+=j+j;
220                 iv=  &(p[ n]); n+=k+k;
221                 er1= &(s->s3->client_random[0]);
222                 er2= &(s->s3->server_random[0]);
223                 }
224         else
225                 {
226                 n=i;
227                 ms=  &(p[ n]); n+=i+j;
228                 key= &(p[ n]); n+=j+k;
229                 iv=  &(p[ n]); n+=k;
230                 er1= &(s->s3->server_random[0]);
231                 er2= &(s->s3->client_random[0]);
232                 }
233
234         if (n > s->s3->tmp.key_block_length)
235                 {
236                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR);
237                 goto err2;
238                 }
239
240         memcpy(mac_secret,ms,i);
241         if (exp)
242                 {
243                 /* In here I set both the read and write key/iv to the
244                  * same value since only the correct one will be used :-).
245                  */
246                 MD5_Init(&md);
247                 MD5_Update(&md,key,j);
248                 MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
249                 MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
250                 MD5_Final(&(exp_key[0]),&md);
251                 key= &(exp_key[0]);
252
253                 if (k > 0)
254                         {
255                         MD5_Init(&md);
256                         MD5_Update(&md,er1,SSL3_RANDOM_SIZE);
257                         MD5_Update(&md,er2,SSL3_RANDOM_SIZE);
258                         MD5_Final(&(exp_iv[0]),&md);
259                         iv= &(exp_iv[0]);
260                         }
261                 }
262
263         s->session->key_arg_length=0;
264
265         EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
266
267         memset(&(exp_key[0]),0,sizeof(exp_key));
268         memset(&(exp_iv[0]),0,sizeof(exp_iv));
269         return(1);
270 err:
271         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
272 err2:
273         return(0);
274         }
275
276 int ssl3_setup_key_block(s)
277 SSL *s;
278         {
279         unsigned char *p;
280         EVP_CIPHER *c;
281         EVP_MD *hash;
282         int num,exp;
283
284         if (s->s3->tmp.key_block_length != 0)
285                 return(1);
286
287         if (!ssl_cipher_get_evp(s->session->cipher,&c,&hash))
288                 {
289                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
290                 return(0);
291                 }
292
293         s->s3->tmp.new_sym_enc=c;
294         s->s3->tmp.new_hash=hash;
295 #ifdef ZLIB
296         s->s3->tmp.new_compression=COMP_zlib();
297 #endif
298 /*      s->s3->tmp.new_compression=COMP_rle(); */
299 /*      s->session->compress_meth= xxxxx */
300
301         exp=(s->session->cipher->algorithms & SSL_EXPORT)?1:0;
302
303         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
304         num*=2;
305
306         ssl3_cleanup_key_block(s);
307
308         if ((p=(unsigned char *)Malloc(num)) == NULL)
309                 goto err;
310
311         s->s3->tmp.key_block_length=num;
312         s->s3->tmp.key_block=p;
313
314         ssl3_generate_key_block(s,p,num);
315
316         return(1);
317 err:
318         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
319         return(0);
320         }
321
322 void ssl3_cleanup_key_block(s)
323 SSL *s;
324         {
325         if (s->s3->tmp.key_block != NULL)
326                 {
327                 memset(s->s3->tmp.key_block,0,
328                         s->s3->tmp.key_block_length);
329                 Free(s->s3->tmp.key_block);
330                 s->s3->tmp.key_block=NULL;
331                 }
332         s->s3->tmp.key_block_length=0;
333         }
334
335 int ssl3_enc(s,send)
336 SSL *s;
337 int send;
338         {
339         SSL3_RECORD *rec;
340         EVP_CIPHER_CTX *ds;
341         unsigned long l;
342         int bs,i;
343         EVP_CIPHER *enc;
344
345         if (send)
346                 {
347                 ds=s->enc_write_ctx;
348                 rec= &(s->s3->wrec);
349                 if (s->enc_write_ctx == NULL)
350                         enc=NULL;
351                 else
352                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
353                 }
354         else
355                 {
356                 ds=s->enc_read_ctx;
357                 rec= &(s->s3->rrec);
358                 if (s->enc_read_ctx == NULL)
359                         enc=NULL;
360                 else
361                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
362                 }
363
364         if ((s->session == NULL) || (ds == NULL) ||
365                 (enc == NULL))
366                 {
367                 memcpy(rec->data,rec->input,rec->length);
368                 rec->input=rec->data;
369                 }
370         else
371                 {
372                 l=rec->length;
373                 bs=EVP_CIPHER_block_size(ds->cipher);
374
375                 /* COMPRESS */
376
377                 /* This should be using (bs-1) and bs instead of 7 and 8 */
378                 if ((bs != 1) && send)
379                         {
380                         i=bs-((int)l%bs);
381
382                         /* we need to add 'i-1' padding bytes */
383                         l+=i;
384                         rec->length+=i;
385                         rec->input[l-1]=(i-1);
386                         }
387
388                 EVP_Cipher(ds,rec->data,rec->input,l);
389
390                 if ((bs != 1) && !send)
391                         {
392                         i=rec->data[l-1]+1;
393                         if (i > bs)
394                                 {
395                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
396                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
397                                 return(0);
398                                 }
399                         rec->length-=i;
400                         }
401                 }
402         return(1);
403         }
404
405 void ssl3_init_finished_mac(s)
406 SSL *s;
407         {
408         EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
409         EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
410         }
411
412 void ssl3_finish_mac(s,buf,len)
413 SSL *s;
414 unsigned char *buf;
415 int len;
416         {
417         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
418         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
419         }
420
421 int ssl3_cert_verify_mac(s,ctx,p)
422 SSL *s;
423 EVP_MD_CTX *ctx;
424 unsigned char *p;
425         {
426         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
427         }
428
429 int ssl3_final_finish_mac(s,ctx1,ctx2,sender,len,p)
430 SSL *s;
431 EVP_MD_CTX *ctx1,*ctx2;
432 unsigned char *sender;
433 int len;
434 unsigned char *p;
435         {
436         int ret;
437
438         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
439         p+=ret;
440         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
441         return(ret);
442         }
443
444 static int ssl3_handshake_mac(s,in_ctx,sender,len,p)
445 SSL *s;
446 EVP_MD_CTX *in_ctx;
447 unsigned char *sender;
448 int len;
449 unsigned char *p;
450         {
451         unsigned int ret;
452         int npad,n;
453         unsigned int i;
454         unsigned char md_buf[EVP_MAX_MD_SIZE];
455         EVP_MD_CTX ctx;
456
457         memcpy(&ctx,in_ctx,sizeof(EVP_MD_CTX));
458
459         n=EVP_MD_CTX_size(&ctx);
460         npad=(48/n)*n;
461
462         if (sender != NULL)
463                 EVP_DigestUpdate(&ctx,sender,len);
464         EVP_DigestUpdate(&ctx,s->session->master_key,
465                 s->session->master_key_length);
466         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
467         EVP_DigestFinal(&ctx,md_buf,&i);
468
469         EVP_DigestInit(&ctx,EVP_MD_CTX_type(&ctx));
470         EVP_DigestUpdate(&ctx,s->session->master_key,
471                 s->session->master_key_length);
472         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
473         EVP_DigestUpdate(&ctx,md_buf,i);
474         EVP_DigestFinal(&ctx,p,&ret);
475
476         memset(&ctx,0,sizeof(EVP_MD_CTX));
477
478         return((int)ret);
479         }
480
481 int ssl3_mac(ssl,md,send)
482 SSL *ssl;
483 unsigned char *md;
484 int send;
485         {
486         SSL3_RECORD *rec;
487         unsigned char *mac_sec,*seq;
488         EVP_MD_CTX md_ctx;
489         EVP_MD *hash;
490         unsigned char *p,rec_char;
491         unsigned int md_size;
492         int npad,i;
493
494         if (send)
495                 {
496                 rec= &(ssl->s3->wrec);
497                 mac_sec= &(ssl->s3->write_mac_secret[0]);
498                 seq= &(ssl->s3->write_sequence[0]);
499                 hash=ssl->write_hash;
500                 }
501         else
502                 {
503                 rec= &(ssl->s3->rrec);
504                 mac_sec= &(ssl->s3->read_mac_secret[0]);
505                 seq= &(ssl->s3->read_sequence[0]);
506                 hash=ssl->read_hash;
507                 }
508
509         md_size=EVP_MD_size(hash);
510         npad=(48/md_size)*md_size;
511
512         /* Chop the digest off the end :-) */
513
514         EVP_DigestInit(  &md_ctx,hash);
515         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
516         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
517         EVP_DigestUpdate(&md_ctx,seq,8);
518         rec_char=rec->type;
519         EVP_DigestUpdate(&md_ctx,&rec_char,1);
520         p=md;
521         s2n(rec->length,p);
522         EVP_DigestUpdate(&md_ctx,md,2);
523         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
524         EVP_DigestFinal( &md_ctx,md,NULL);
525
526         EVP_DigestInit(  &md_ctx,hash);
527         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
528         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
529         EVP_DigestUpdate(&md_ctx,md,md_size);
530         EVP_DigestFinal( &md_ctx,md,&md_size);
531
532         for (i=7; i>=0; i--)
533                 if (++seq[i]) break; 
534
535         return(md_size);
536         }
537
538 int ssl3_generate_master_secret(s,out,p,len)
539 SSL *s;
540 unsigned char *out;
541 unsigned char *p;
542 int len;
543         {
544         static unsigned char *salt[3]={
545                 (unsigned char *)"A",
546                 (unsigned char *)"BB",
547                 (unsigned char *)"CCC",
548                 };
549         unsigned char buf[EVP_MAX_MD_SIZE];
550         EVP_MD_CTX ctx;
551         int i,ret=0;
552         unsigned int n;
553
554         for (i=0; i<3; i++)
555                 {
556                 EVP_DigestInit(&ctx,s->ctx->sha1);
557                 EVP_DigestUpdate(&ctx,salt[i],strlen((char *)salt[i]));
558                 EVP_DigestUpdate(&ctx,p,len);
559                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
560                         SSL3_RANDOM_SIZE);
561                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
562                         SSL3_RANDOM_SIZE);
563                 EVP_DigestFinal(&ctx,buf,&n);
564
565                 EVP_DigestInit(&ctx,s->ctx->md5);
566                 EVP_DigestUpdate(&ctx,p,len);
567                 EVP_DigestUpdate(&ctx,buf,n);
568                 EVP_DigestFinal(&ctx,out,&n);
569                 out+=n;
570                 ret+=n;
571                 }
572         return(ret);
573         }
574
575 int ssl3_alert_code(code)
576 int code;
577         {
578         switch (code)
579                 {
580         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
581         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
582         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
583         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
584         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
585         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
586         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
587         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
588         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
589         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
590         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
591         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
592         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
593         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
594         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
595         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
596         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
597         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
598         case SSL_AD_EXPORT_RESTRICION:  return(SSL3_AD_HANDSHAKE_FAILURE);
599         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
600         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
601         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
602         case SSL_AD_USER_CANCLED:       return(SSL3_AD_HANDSHAKE_FAILURE);
603         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
604         default:                        return(-1);
605                 }
606         }
607