2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include <openssl/evp.h>
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 };
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 };
79 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
80 const char *sender, int len, unsigned char *p);
82 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
86 unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
91 c = os_toascii[c]; /*'A' in ASCII */
94 for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
99 /* bug: 'buf' is too small for this ciphersuite */
100 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
107 EVP_DigestInit(&s1,EVP_sha1());
108 EVP_DigestUpdate(&s1,buf,k);
109 EVP_DigestUpdate(&s1,s->session->master_key,
110 s->session->master_key_length);
111 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
112 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
113 EVP_DigestFinal(&s1,smd,NULL);
115 EVP_DigestInit(&m5,EVP_md5());
116 EVP_DigestUpdate(&m5,s->session->master_key,
117 s->session->master_key_length);
118 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
119 if ((i+MD5_DIGEST_LENGTH) > num)
121 EVP_DigestFinal(&m5,smd,NULL);
122 memcpy(km,smd,(num-i));
125 EVP_DigestFinal(&m5,km,NULL);
127 km+=MD5_DIGEST_LENGTH;
129 memset(smd,0,SHA_DIGEST_LENGTH);
133 int ssl3_change_cipher_state(SSL *s, int which)
135 unsigned char *p,*key_block,*mac_secret;
136 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
137 unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
138 unsigned char *ms,*key,*iv,*er1,*er2;
146 exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
147 c=s->s3->tmp.new_sym_enc;
148 m=s->s3->tmp.new_hash;
149 if (s->s3->tmp.new_compression == NULL)
152 comp=s->s3->tmp.new_compression->method;
153 key_block=s->s3->tmp.key_block;
155 if (which & SSL3_CC_READ)
157 if ((s->enc_read_ctx == NULL) &&
158 ((s->enc_read_ctx=(EVP_CIPHER_CTX *)
159 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
164 if (s->expand != NULL)
166 COMP_CTX_free(s->expand);
171 s->expand=COMP_CTX_new(comp);
172 if (s->expand == NULL)
174 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
177 if (s->s3->rrec.comp == NULL)
178 s->s3->rrec.comp=(unsigned char *)
179 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
180 if (s->s3->rrec.comp == NULL)
183 memset(&(s->s3->read_sequence[0]),0,8);
184 mac_secret= &(s->s3->read_mac_secret[0]);
188 if ((s->enc_write_ctx == NULL) &&
189 ((s->enc_write_ctx=(EVP_CIPHER_CTX *)
190 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL))
192 dd= s->enc_write_ctx;
195 if (s->compress != NULL)
197 COMP_CTX_free(s->compress);
202 s->compress=COMP_CTX_new(comp);
203 if (s->compress == NULL)
205 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
209 memset(&(s->s3->write_sequence[0]),0,8);
210 mac_secret= &(s->s3->write_mac_secret[0]);
213 EVP_CIPHER_CTX_init(dd);
215 p=s->s3->tmp.key_block;
217 cl=EVP_CIPHER_key_length(c);
218 j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
219 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
220 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
221 k=EVP_CIPHER_iv_length(c);
222 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
223 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
226 key= &(p[ n]); n+=j+j;
227 iv= &(p[ n]); n+=k+k;
228 er1= &(s->s3->client_random[0]);
229 er2= &(s->s3->server_random[0]);
234 ms= &(p[ n]); n+=i+j;
235 key= &(p[ n]); n+=j+k;
237 er1= &(s->s3->server_random[0]);
238 er2= &(s->s3->client_random[0]);
241 if (n > s->s3->tmp.key_block_length)
243 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
247 memcpy(mac_secret,ms,i);
250 /* In here I set both the read and write key/iv to the
251 * same value since only the correct one will be used :-).
253 EVP_DigestInit(&md,EVP_md5());
254 EVP_DigestUpdate(&md,key,j);
255 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
256 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
257 EVP_DigestFinal(&md,&(exp_key[0]),NULL);
262 EVP_DigestInit(&md,EVP_md5());
263 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
264 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
265 EVP_DigestFinal(&md,&(exp_iv[0]),NULL);
270 s->session->key_arg_length=0;
272 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE));
274 memset(&(exp_key[0]),0,sizeof(exp_key));
275 memset(&(exp_iv[0]),0,sizeof(exp_iv));
278 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
283 int ssl3_setup_key_block(SSL *s)
291 if (s->s3->tmp.key_block_length != 0)
294 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
296 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
300 s->s3->tmp.new_sym_enc=c;
301 s->s3->tmp.new_hash=hash;
302 s->s3->tmp.new_compression=comp;
304 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
307 ssl3_cleanup_key_block(s);
309 if ((p=OPENSSL_malloc(num)) == NULL)
312 s->s3->tmp.key_block_length=num;
313 s->s3->tmp.key_block=p;
315 return ssl3_generate_key_block(s,p,num);
318 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
322 void ssl3_cleanup_key_block(SSL *s)
324 if (s->s3->tmp.key_block != NULL)
326 memset(s->s3->tmp.key_block,0,
327 s->s3->tmp.key_block_length);
328 OPENSSL_free(s->s3->tmp.key_block);
329 s->s3->tmp.key_block=NULL;
331 s->s3->tmp.key_block_length=0;
334 int ssl3_enc(SSL *s, int send)
340 const EVP_CIPHER *enc;
346 if (s->enc_write_ctx == NULL)
349 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
355 if (s->enc_read_ctx == NULL)
358 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
361 if ((s->session == NULL) || (ds == NULL) ||
364 memmove(rec->data,rec->input,rec->length);
365 rec->input=rec->data;
370 bs=EVP_CIPHER_block_size(ds->cipher);
374 if ((bs != 1) && send)
378 /* we need to add 'i-1' padding bytes */
381 rec->input[l-1]=(i-1);
386 if (l == 0 || l%bs != 0)
388 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
389 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
394 EVP_Cipher(ds,rec->data,rec->input,l);
396 if ((bs != 1) && !send)
399 /* SSL 3.0 bounds the number of padding bytes by the block size;
400 * padding bytes (except that last) are arbitrary */
403 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
404 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPT_ERROR);
413 void ssl3_init_finished_mac(SSL *s)
415 EVP_DigestInit(&(s->s3->finish_dgst1),s->ctx->md5);
416 EVP_DigestInit(&(s->s3->finish_dgst2),s->ctx->sha1);
419 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
421 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
422 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
425 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
427 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
430 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
431 const char *sender, int len, unsigned char *p)
435 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
437 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
441 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
442 const char *sender, int len, unsigned char *p)
447 unsigned char md_buf[EVP_MAX_MD_SIZE];
450 EVP_MD_CTX_copy(&ctx,in_ctx);
452 n=EVP_MD_CTX_size(&ctx);
456 EVP_DigestUpdate(&ctx,sender,len);
457 EVP_DigestUpdate(&ctx,s->session->master_key,
458 s->session->master_key_length);
459 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
460 EVP_DigestFinal(&ctx,md_buf,&i);
462 EVP_DigestInit(&ctx,EVP_MD_CTX_md(&ctx));
463 EVP_DigestUpdate(&ctx,s->session->master_key,
464 s->session->master_key_length);
465 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
466 EVP_DigestUpdate(&ctx,md_buf,i);
467 EVP_DigestFinal(&ctx,p,&ret);
469 memset(&ctx,0,sizeof(EVP_MD_CTX));
474 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
477 unsigned char *mac_sec,*seq;
480 unsigned char *p,rec_char;
481 unsigned int md_size;
486 rec= &(ssl->s3->wrec);
487 mac_sec= &(ssl->s3->write_mac_secret[0]);
488 seq= &(ssl->s3->write_sequence[0]);
489 hash=ssl->write_hash;
493 rec= &(ssl->s3->rrec);
494 mac_sec= &(ssl->s3->read_mac_secret[0]);
495 seq= &(ssl->s3->read_sequence[0]);
499 md_size=EVP_MD_size(hash);
500 npad=(48/md_size)*md_size;
502 /* Chop the digest off the end :-) */
504 EVP_DigestInit( &md_ctx,hash);
505 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
506 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
507 EVP_DigestUpdate(&md_ctx,seq,8);
509 EVP_DigestUpdate(&md_ctx,&rec_char,1);
512 EVP_DigestUpdate(&md_ctx,md,2);
513 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
514 EVP_DigestFinal( &md_ctx,md,NULL);
516 EVP_DigestInit( &md_ctx,hash);
517 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
518 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
519 EVP_DigestUpdate(&md_ctx,md,md_size);
520 EVP_DigestFinal( &md_ctx,md,&md_size);
525 if (seq[i] != 0) break;
531 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
534 static const unsigned char *salt[3]={
535 #ifndef CHARSET_EBCDIC
536 (const unsigned char *)"A",
537 (const unsigned char *)"BB",
538 (const unsigned char *)"CCC",
540 (const unsigned char *)"\x41",
541 (const unsigned char *)"\x42\x42",
542 (const unsigned char *)"\x43\x43\x43",
545 unsigned char buf[EVP_MAX_MD_SIZE];
552 EVP_DigestInit(&ctx,s->ctx->sha1);
553 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
554 EVP_DigestUpdate(&ctx,p,len);
555 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
557 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
559 EVP_DigestFinal(&ctx,buf,&n);
561 EVP_DigestInit(&ctx,s->ctx->md5);
562 EVP_DigestUpdate(&ctx,p,len);
563 EVP_DigestUpdate(&ctx,buf,n);
564 EVP_DigestFinal(&ctx,out,&n);
571 int ssl3_alert_code(int code)
575 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
576 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
577 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
578 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
579 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
580 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
581 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
582 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
583 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
584 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
585 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
586 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
587 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
588 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
589 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
590 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
591 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
592 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
593 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
594 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
595 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
596 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
597 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
598 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */