prepare for additional RFC3546 alerts
[openssl.git] / ssl / t1_enc.c
1 /* ssl/t1_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  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111
112 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/comp.h>
115 #include <openssl/evp.h>
116 #include <openssl/hmac.h>
117 #include <openssl/md5.h>
118
119 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
120                         int sec_len, unsigned char *seed, int seed_len,
121                         unsigned char *out, int olen)
122         {
123         int chunk,n;
124         unsigned int j;
125         HMAC_CTX ctx;
126         HMAC_CTX ctx_tmp;
127         unsigned char A1[EVP_MAX_MD_SIZE];
128         unsigned int A1_len;
129         
130         chunk=EVP_MD_size(md);
131
132         HMAC_CTX_init(&ctx);
133         HMAC_CTX_init(&ctx_tmp);
134         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
135         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
136         HMAC_Update(&ctx,seed,seed_len);
137         HMAC_Final(&ctx,A1,&A1_len);
138
139         n=0;
140         for (;;)
141                 {
142                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
143                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
144                 HMAC_Update(&ctx,A1,A1_len);
145                 HMAC_Update(&ctx_tmp,A1,A1_len);
146                 HMAC_Update(&ctx,seed,seed_len);
147
148                 if (olen > chunk)
149                         {
150                         HMAC_Final(&ctx,out,&j);
151                         out+=j;
152                         olen-=j;
153                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
154                         }
155                 else    /* last one */
156                         {
157                         HMAC_Final(&ctx,A1,&A1_len);
158                         memcpy(out,A1,olen);
159                         break;
160                         }
161                 }
162         HMAC_CTX_cleanup(&ctx);
163         HMAC_CTX_cleanup(&ctx_tmp);
164         OPENSSL_cleanse(A1,sizeof(A1));
165         }
166
167 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
168                      unsigned char *label, int label_len,
169                      const unsigned char *sec, int slen, unsigned char *out1,
170                      unsigned char *out2, int olen)
171         {
172         int len,i;
173         const unsigned char *S1,*S2;
174
175         len=slen/2;
176         S1=sec;
177         S2= &(sec[len]);
178         len+=(slen&1); /* add for odd, make longer */
179
180         
181         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
182         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
183
184         for (i=0; i<olen; i++)
185                 out1[i]^=out2[i];
186         }
187
188 static void tls1_generate_key_block(SSL *s, unsigned char *km,
189              unsigned char *tmp, int num)
190         {
191         unsigned char *p;
192         unsigned char buf[SSL3_RANDOM_SIZE*2+
193                 TLS_MD_MAX_CONST_SIZE];
194         p=buf;
195
196         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
197                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
198         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
199         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
200         p+=SSL3_RANDOM_SIZE;
201         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
202         p+=SSL3_RANDOM_SIZE;
203
204         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
205                  s->session->master_key,s->session->master_key_length,
206                  km,tmp,num);
207 #ifdef KSSL_DEBUG
208         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
209                 s->session->master_key_length);
210         {
211         int i;
212         for (i=0; i < s->session->master_key_length; i++)
213                 {
214                 printf("%02X", s->session->master_key[i]);
215                 }
216         printf("\n");  }
217 #endif    /* KSSL_DEBUG */
218         }
219
220 int tls1_change_cipher_state(SSL *s, int which)
221         {
222         static const unsigned char empty[]="";
223         unsigned char *p,*key_block,*mac_secret;
224         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
225                 SSL3_RANDOM_SIZE*2];
226         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
227         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
228         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
229         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
230         unsigned char *ms,*key,*iv,*er1,*er2;
231         int client_write;
232         EVP_CIPHER_CTX *dd;
233         const EVP_CIPHER *c;
234 #ifndef OPENSSL_NO_COMP
235         const SSL_COMP *comp;
236 #endif
237         const EVP_MD *m;
238         int is_export,n,i,j,k,exp_label_len,cl;
239         int reuse_dd = 0;
240
241         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
242         c=s->s3->tmp.new_sym_enc;
243         m=s->s3->tmp.new_hash;
244 #ifndef OPENSSL_NO_COMP
245         comp=s->s3->tmp.new_compression;
246 #endif
247         key_block=s->s3->tmp.key_block;
248
249 #ifdef KSSL_DEBUG
250         printf("tls1_change_cipher_state(which= %d) w/\n", which);
251         printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms,
252                 comp);
253         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
254         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
255                 c->nid,c->block_size,c->key_len,c->iv_len);
256         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
257         {
258         int i;
259         for (i=0; i<s->s3->tmp.key_block_length; i++)
260                 printf("%02x", key_block[i]);  printf("\n");
261         }
262 #endif  /* KSSL_DEBUG */
263
264         if (which & SSL3_CC_READ)
265                 {
266                 if (s->enc_read_ctx != NULL)
267                         reuse_dd = 1;
268                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
269                         goto err;
270                 dd= s->enc_read_ctx;
271                 s->read_hash=m;
272 #ifndef OPENSSL_NO_COMP
273                 if (s->expand != NULL)
274                         {
275                         COMP_CTX_free(s->expand);
276                         s->expand=NULL;
277                         }
278                 if (comp != NULL)
279                         {
280                         s->expand=COMP_CTX_new(comp->method);
281                         if (s->expand == NULL)
282                                 {
283                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
284                                 goto err2;
285                                 }
286                         if (s->s3->rrec.comp == NULL)
287                                 s->s3->rrec.comp=(unsigned char *)
288                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
289                         if (s->s3->rrec.comp == NULL)
290                                 goto err;
291                         }
292 #endif
293                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
294                 if (s->version != DTLS1_VERSION)
295                         memset(&(s->s3->read_sequence[0]),0,8);
296                 mac_secret= &(s->s3->read_mac_secret[0]);
297                 }
298         else
299                 {
300                 if (s->enc_write_ctx != NULL)
301                         reuse_dd = 1;
302                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
303                         goto err;
304                 if ((s->enc_write_ctx == NULL) &&
305                         ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
306                         OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
307                         goto err;
308                 dd= s->enc_write_ctx;
309                 s->write_hash=m;
310 #ifndef OPENSSL_NO_COMP
311                 if (s->compress != NULL)
312                         {
313                         COMP_CTX_free(s->compress);
314                         s->compress=NULL;
315                         }
316                 if (comp != NULL)
317                         {
318                         s->compress=COMP_CTX_new(comp->method);
319                         if (s->compress == NULL)
320                                 {
321                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
322                                 goto err2;
323                                 }
324                         }
325 #endif
326                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
327                 if (s->version != DTLS1_VERSION)
328                         memset(&(s->s3->write_sequence[0]),0,8);
329                 mac_secret= &(s->s3->write_mac_secret[0]);
330                 }
331
332         if (reuse_dd)
333                 EVP_CIPHER_CTX_cleanup(dd);
334         EVP_CIPHER_CTX_init(dd);
335
336         p=s->s3->tmp.key_block;
337         i=EVP_MD_size(m);
338         cl=EVP_CIPHER_key_length(c);
339         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
340                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
341         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
342         k=EVP_CIPHER_iv_length(c);
343         er1= &(s->s3->client_random[0]);
344         er2= &(s->s3->server_random[0]);
345         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
346                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
347                 {
348                 ms=  &(p[ 0]); n=i+i;
349                 key= &(p[ n]); n+=j+j;
350                 iv=  &(p[ n]); n+=k+k;
351                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
352                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
353                 client_write=1;
354                 }
355         else
356                 {
357                 n=i;
358                 ms=  &(p[ n]); n+=i+j;
359                 key= &(p[ n]); n+=j+k;
360                 iv=  &(p[ n]); n+=k;
361                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
362                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
363                 client_write=0;
364                 }
365
366         if (n > s->s3->tmp.key_block_length)
367                 {
368                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
369                 goto err2;
370                 }
371
372         memcpy(mac_secret,ms,i);
373 #ifdef TLS_DEBUG
374 printf("which = %04X\nmac key=",which);
375 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
376 #endif
377         if (is_export)
378                 {
379                 /* In here I set both the read and write key/iv to the
380                  * same value since only the correct one will be used :-).
381                  */
382                 p=buf;
383                 memcpy(p,exp_label,exp_label_len);
384                 p+=exp_label_len;
385                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
386                 p+=SSL3_RANDOM_SIZE;
387                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
388                 p+=SSL3_RANDOM_SIZE;
389                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
390                          tmp1,tmp2,EVP_CIPHER_key_length(c));
391                 key=tmp1;
392
393                 if (k > 0)
394                         {
395                         p=buf;
396                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
397                                 TLS_MD_IV_BLOCK_CONST_SIZE);
398                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
399                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
400                         p+=SSL3_RANDOM_SIZE;
401                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
402                         p+=SSL3_RANDOM_SIZE;
403                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
404                                  iv1,iv2,k*2);
405                         if (client_write)
406                                 iv=iv1;
407                         else
408                                 iv= &(iv1[k]);
409                         }
410                 }
411
412         s->session->key_arg_length=0;
413 #ifdef KSSL_DEBUG
414         {
415         int i;
416         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
417         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
418         printf("\n");
419         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
420         printf("\n");
421         }
422 #endif  /* KSSL_DEBUG */
423
424         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
425 #ifdef TLS_DEBUG
426 printf("which = %04X\nkey=",which);
427 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
428 printf("\niv=");
429 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
430 printf("\n");
431 #endif
432
433         OPENSSL_cleanse(tmp1,sizeof(tmp1));
434         OPENSSL_cleanse(tmp2,sizeof(tmp1));
435         OPENSSL_cleanse(iv1,sizeof(iv1));
436         OPENSSL_cleanse(iv2,sizeof(iv2));
437         return(1);
438 err:
439         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
440 err2:
441         return(0);
442         }
443
444 int tls1_setup_key_block(SSL *s)
445         {
446         unsigned char *p1,*p2;
447         const EVP_CIPHER *c;
448         const EVP_MD *hash;
449         int num;
450         SSL_COMP *comp;
451
452 #ifdef KSSL_DEBUG
453         printf ("tls1_setup_key_block()\n");
454 #endif  /* KSSL_DEBUG */
455
456         if (s->s3->tmp.key_block_length != 0)
457                 return(1);
458
459         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
460                 {
461                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
462                 return(0);
463                 }
464
465         s->s3->tmp.new_sym_enc=c;
466         s->s3->tmp.new_hash=hash;
467
468         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
469         num*=2;
470
471         ssl3_cleanup_key_block(s);
472
473         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
474                 goto err;
475         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
476                 goto err;
477
478         s->s3->tmp.key_block_length=num;
479         s->s3->tmp.key_block=p1;
480
481
482 #ifdef TLS_DEBUG
483 printf("client random\n");
484 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
485 printf("server random\n");
486 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
487 printf("pre-master\n");
488 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
489 #endif
490         tls1_generate_key_block(s,p1,p2,num);
491         OPENSSL_cleanse(p2,num);
492         OPENSSL_free(p2);
493 #ifdef TLS_DEBUG
494 printf("\nkey block\n");
495 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
496 #endif
497
498         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
499                 {
500                 /* enable vulnerability countermeasure for CBC ciphers with
501                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
502                  */
503                 s->s3->need_empty_fragments = 1;
504
505                 if (s->session->cipher != NULL)
506                         {
507                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
508                                 s->s3->need_empty_fragments = 0;
509                         
510 #ifndef OPENSSL_NO_RC4
511                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
512                                 s->s3->need_empty_fragments = 0;
513 #endif
514                         }
515                 }
516                 
517         return(1);
518 err:
519         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
520         return(0);
521         }
522
523 int tls1_enc(SSL *s, int send)
524         {
525         SSL3_RECORD *rec;
526         EVP_CIPHER_CTX *ds;
527         unsigned long l;
528         int bs,i,ii,j,k,n=0;
529         const EVP_CIPHER *enc;
530
531         if (send)
532                 {
533                 if (s->write_hash != NULL)
534                         n=EVP_MD_size(s->write_hash);
535                 ds=s->enc_write_ctx;
536                 rec= &(s->s3->wrec);
537                 if (s->enc_write_ctx == NULL)
538                         enc=NULL;
539                 else
540                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
541                 }
542         else
543                 {
544                 if (s->read_hash != NULL)
545                         n=EVP_MD_size(s->read_hash);
546                 ds=s->enc_read_ctx;
547                 rec= &(s->s3->rrec);
548                 if (s->enc_read_ctx == NULL)
549                         enc=NULL;
550                 else
551                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
552                 }
553
554 #ifdef KSSL_DEBUG
555         printf("tls1_enc(%d)\n", send);
556 #endif    /* KSSL_DEBUG */
557
558         if ((s->session == NULL) || (ds == NULL) ||
559                 (enc == NULL))
560                 {
561                 memmove(rec->data,rec->input,rec->length);
562                 rec->input=rec->data;
563                 }
564         else
565                 {
566                 l=rec->length;
567                 bs=EVP_CIPHER_block_size(ds->cipher);
568
569                 if ((bs != 1) && send)
570                         {
571                         i=bs-((int)l%bs);
572
573                         /* Add weird padding of upto 256 bytes */
574
575                         /* we need to add 'i' padding bytes of value j */
576                         j=i-1;
577                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
578                                 {
579                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
580                                         j++;
581                                 }
582                         for (k=(int)l; k<(int)(l+i); k++)
583                                 rec->input[k]=j;
584                         l+=i;
585                         rec->length+=i;
586                         }
587
588 #ifdef KSSL_DEBUG
589                 {
590                 unsigned long ui;
591                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
592                         ds,rec->data,rec->input,l);
593                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
594                         ds->buf_len, ds->cipher->key_len,
595                         DES_KEY_SZ, DES_SCHEDULE_SZ,
596                         ds->cipher->iv_len);
597                 printf("\t\tIV: ");
598                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
599                 printf("\n");
600                 printf("\trec->input=");
601                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
602                 printf("\n");
603                 }
604 #endif  /* KSSL_DEBUG */
605
606                 if (!send)
607                         {
608                         if (l == 0 || l%bs != 0)
609                                 {
610                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
611                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
612                                 return 0;
613                                 }
614                         }
615                 
616                 EVP_Cipher(ds,rec->data,rec->input,l);
617
618 #ifdef KSSL_DEBUG
619                 {
620                 unsigned long i;
621                 printf("\trec->data=");
622                 for (i=0; i<l; i++)
623                         printf(" %02x", rec->data[i]);  printf("\n");
624                 }
625 #endif  /* KSSL_DEBUG */
626
627                 if ((bs != 1) && !send)
628                         {
629                         ii=i=rec->data[l-1]; /* padding_length */
630                         i++;
631                         if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
632                                 {
633                                 /* First packet is even in size, so check */
634                                 if ((memcmp(s->s3->read_sequence,
635                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
636                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
637                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
638                                         i--;
639                                 }
640                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
641                          * All of them must have value 'padding_length'. */
642                         if (i > (int)rec->length)
643                                 {
644                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
645                                  * by caller: we don't want to reveal whether this is
646                                  * a decryption error or a MAC verification failure
647                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
648                                 return -1;
649                                 }
650                         for (j=(int)(l-i); j<(int)l; j++)
651                                 {
652                                 if (rec->data[j] != ii)
653                                         {
654                                         /* Incorrect padding */
655                                         return -1;
656                                         }
657                                 }
658                         rec->length-=i;
659                         }
660                 }
661         return(1);
662         }
663
664 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
665         {
666         unsigned int ret;
667         EVP_MD_CTX ctx;
668
669         EVP_MD_CTX_init(&ctx);
670         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
671         EVP_DigestFinal_ex(&ctx,out,&ret);
672         EVP_MD_CTX_cleanup(&ctx);
673         return((int)ret);
674         }
675
676 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
677              const char *str, int slen, unsigned char *out)
678         {
679         unsigned int i;
680         EVP_MD_CTX ctx;
681         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
682         unsigned char *q,buf2[12];
683
684         q=buf;
685         memcpy(q,str,slen);
686         q+=slen;
687
688         EVP_MD_CTX_init(&ctx);
689         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
690         EVP_DigestFinal_ex(&ctx,q,&i);
691         q+=i;
692         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
693         EVP_DigestFinal_ex(&ctx,q,&i);
694         q+=i;
695
696         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
697                 s->session->master_key,s->session->master_key_length,
698                 out,buf2,sizeof buf2);
699         EVP_MD_CTX_cleanup(&ctx);
700
701         return sizeof buf2;
702         }
703
704 int tls1_mac(SSL *ssl, unsigned char *md, int send)
705         {
706         SSL3_RECORD *rec;
707         unsigned char *mac_sec,*seq;
708         const EVP_MD *hash;
709         unsigned int md_size;
710         int i;
711         HMAC_CTX hmac;
712         unsigned char buf[5]; 
713
714         if (send)
715                 {
716                 rec= &(ssl->s3->wrec);
717                 mac_sec= &(ssl->s3->write_mac_secret[0]);
718                 seq= &(ssl->s3->write_sequence[0]);
719                 hash=ssl->write_hash;
720                 }
721         else
722                 {
723                 rec= &(ssl->s3->rrec);
724                 mac_sec= &(ssl->s3->read_mac_secret[0]);
725                 seq= &(ssl->s3->read_sequence[0]);
726                 hash=ssl->read_hash;
727                 }
728
729         md_size=EVP_MD_size(hash);
730
731         buf[0]=rec->type;
732         buf[1]=TLS1_VERSION_MAJOR;
733         buf[2]=TLS1_VERSION_MINOR;
734         buf[3]=rec->length>>8;
735         buf[4]=rec->length&0xff;
736
737         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
738         HMAC_CTX_init(&hmac);
739         HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL);
740         HMAC_Update(&hmac,seq,8);
741         HMAC_Update(&hmac,buf,5);
742         HMAC_Update(&hmac,rec->input,rec->length);
743         HMAC_Final(&hmac,md,&md_size);
744         HMAC_CTX_cleanup(&hmac);
745
746 #ifdef TLS_DEBUG
747 printf("sec=");
748 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
749 printf("seq=");
750 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
751 printf("buf=");
752 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
753 printf("rec=");
754 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
755 #endif
756
757     if ( SSL_version(ssl) != DTLS1_VERSION)
758             {
759                 for (i=7; i>=0; i--)
760                         {
761                         ++seq[i];
762                         if (seq[i] != 0) break; 
763                         }
764                 }
765
766 #ifdef TLS_DEBUG
767 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
768 #endif
769         return(md_size);
770         }
771
772 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
773              int len)
774         {
775         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
776         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
777
778 #ifdef KSSL_DEBUG
779         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
780 #endif  /* KSSL_DEBUG */
781
782         /* Setup the stuff to munge */
783         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
784                 TLS_MD_MASTER_SECRET_CONST_SIZE);
785         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
786                 s->s3->client_random,SSL3_RANDOM_SIZE);
787         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
788                 s->s3->server_random,SSL3_RANDOM_SIZE);
789         tls1_PRF(s->ctx->md5,s->ctx->sha1,
790                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
791                 s->session->master_key,buff,sizeof buff);
792 #ifdef KSSL_DEBUG
793         printf ("tls1_generate_master_secret() complete\n");
794 #endif  /* KSSL_DEBUG */
795         return(SSL3_MASTER_SECRET_SIZE);
796         }
797
798 int tls1_alert_code(int code)
799         {
800         switch (code)
801                 {
802         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
803         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
804         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
805         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
806         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
807         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
808         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
809         case SSL_AD_NO_CERTIFICATE:     return(-1);
810         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
811         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
812         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
813         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
814         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
815         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
816         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
817         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
818         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
819         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
820         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
821         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
822         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
823         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
824         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
825         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
826         case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
827         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
828         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
829         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
830         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
831         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 
832                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
833         default:                        return(-1);
834                 }
835         }
836