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/md5.h>
61 #include <openssl/sha.h>
62 #include <openssl/evp.h>
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 };
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 };
81 static int ssl3_handshake_mac(SSL
*s
, EVP_MD_CTX
*in_ctx
,
82 const char *sender
, int len
, unsigned char *p
);
84 static void ssl3_generate_key_block(SSL
*s
, unsigned char *km
, int num
)
88 unsigned char buf
[8],smd
[SHA_DIGEST_LENGTH
];
93 c
= os_toascii
[c
]; /*'A' in ASCII */
96 for (i
=0; i
<num
; i
+=MD5_DIGEST_LENGTH
)
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
);
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
)
117 memcpy(km
,smd
,(num
-i
));
122 km
+=MD5_DIGEST_LENGTH
;
124 memset(smd
,0,SHA_DIGEST_LENGTH
);
127 int ssl3_change_cipher_state(SSL
*s
, int which
)
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
;
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
)
146 comp
=s
->s3
->tmp
.new_compression
->method
;
147 key_block
=s
->s3
->tmp
.key_block
;
149 if (which
& SSL3_CC_READ
)
151 if ((s
->enc_read_ctx
== NULL
) &&
152 ((s
->enc_read_ctx
=(EVP_CIPHER_CTX
*)
153 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX
))) == NULL
))
158 if (s
->expand
!= NULL
)
160 COMP_CTX_free(s
->expand
);
165 s
->expand
=COMP_CTX_new(comp
);
166 if (s
->expand
== NULL
)
168 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,SSL_R_COMPRESSION_LIBRARY_ERROR
);
171 if (s
->s3
->rrec
.comp
== NULL
)
172 s
->s3
->rrec
.comp
=(unsigned char *)
173 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH
);
174 if (s
->s3
->rrec
.comp
== NULL
)
177 memset(&(s
->s3
->read_sequence
[0]),0,8);
178 mac_secret
= &(s
->s3
->read_mac_secret
[0]);
182 if ((s
->enc_write_ctx
== NULL
) &&
183 ((s
->enc_write_ctx
=(EVP_CIPHER_CTX
*)
184 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX
))) == NULL
))
186 dd
= s
->enc_write_ctx
;
189 if (s
->compress
!= NULL
)
191 COMP_CTX_free(s
->compress
);
196 s
->compress
=COMP_CTX_new(comp
);
197 if (s
->compress
== NULL
)
199 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,SSL_R_COMPRESSION_LIBRARY_ERROR
);
203 memset(&(s
->s3
->write_sequence
[0]),0,8);
204 mac_secret
= &(s
->s3
->write_mac_secret
[0]);
207 EVP_CIPHER_CTX_init(dd
);
209 p
=s
->s3
->tmp
.key_block
;
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
))
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]);
228 ms
= &(p
[ n
]); n
+=i
+j
;
229 key
= &(p
[ n
]); n
+=j
+k
;
231 er1
= &(s
->s3
->server_random
[0]);
232 er2
= &(s
->s3
->client_random
[0]);
235 if (n
> s
->s3
->tmp
.key_block_length
)
237 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,ERR_R_INTERNAL_ERROR
);
241 memcpy(mac_secret
,ms
,i
);
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 :-).
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
);
257 MD5_Update(&md
,er1
,SSL3_RANDOM_SIZE
);
258 MD5_Update(&md
,er2
,SSL3_RANDOM_SIZE
);
259 MD5_Final(&(exp_iv
[0]),&md
);
264 s
->session
->key_arg_length
=0;
266 EVP_CipherInit(dd
,c
,key
,iv
,(which
& SSL3_CC_WRITE
));
268 memset(&(exp_key
[0]),0,sizeof(exp_key
));
269 memset(&(exp_iv
[0]),0,sizeof(exp_iv
));
272 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE
,ERR_R_MALLOC_FAILURE
);
277 int ssl3_setup_key_block(SSL
*s
)
285 if (s
->s3
->tmp
.key_block_length
!= 0)
288 if (!ssl_cipher_get_evp(s
->session
,&c
,&hash
,&comp
))
290 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK
,SSL_R_CIPHER_OR_HASH_UNAVAILABLE
);
294 s
->s3
->tmp
.new_sym_enc
=c
;
295 s
->s3
->tmp
.new_hash
=hash
;
296 s
->s3
->tmp
.new_compression
=comp
;
298 num
=EVP_CIPHER_key_length(c
)+EVP_MD_size(hash
)+EVP_CIPHER_iv_length(c
);
301 ssl3_cleanup_key_block(s
);
303 if ((p
=OPENSSL_malloc(num
)) == NULL
)
306 s
->s3
->tmp
.key_block_length
=num
;
307 s
->s3
->tmp
.key_block
=p
;
309 ssl3_generate_key_block(s
,p
,num
);
313 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK
,ERR_R_MALLOC_FAILURE
);
317 void ssl3_cleanup_key_block(SSL
*s
)
319 if (s
->s3
->tmp
.key_block
!= NULL
)
321 memset(s
->s3
->tmp
.key_block
,0,
322 s
->s3
->tmp
.key_block_length
);
323 OPENSSL_free(s
->s3
->tmp
.key_block
);
324 s
->s3
->tmp
.key_block
=NULL
;
326 s
->s3
->tmp
.key_block_length
=0;
329 int ssl3_enc(SSL
*s
, int send
)
335 const EVP_CIPHER
*enc
;
341 if (s
->enc_write_ctx
== NULL
)
344 enc
=EVP_CIPHER_CTX_cipher(s
->enc_write_ctx
);
350 if (s
->enc_read_ctx
== NULL
)
353 enc
=EVP_CIPHER_CTX_cipher(s
->enc_read_ctx
);
356 if ((s
->session
== NULL
) || (ds
== NULL
) ||
359 memcpy(rec
->data
,rec
->input
,rec
->length
);
360 rec
->input
=rec
->data
;
365 bs
=EVP_CIPHER_block_size(ds
->cipher
);
369 /* This should be using (bs-1) and bs instead of 7 and 8 */
370 if ((bs
!= 1) && send
)
374 /* we need to add 'i-1' padding bytes */
377 rec
->input
[l
-1]=(i
-1);
380 EVP_Cipher(ds
,rec
->data
,rec
->input
,l
);
382 if ((bs
!= 1) && !send
)
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
);
397 void ssl3_init_finished_mac(SSL
*s
)
399 EVP_DigestInit(&(s
->s3
->finish_dgst1
),s
->ctx
->md5
);
400 EVP_DigestInit(&(s
->s3
->finish_dgst2
),s
->ctx
->sha1
);
403 void ssl3_finish_mac(SSL
*s
, const unsigned char *buf
, int len
)
405 EVP_DigestUpdate(&(s
->s3
->finish_dgst1
),buf
,len
);
406 EVP_DigestUpdate(&(s
->s3
->finish_dgst2
),buf
,len
);
409 int ssl3_cert_verify_mac(SSL
*s
, EVP_MD_CTX
*ctx
, unsigned char *p
)
411 return(ssl3_handshake_mac(s
,ctx
,NULL
,0,p
));
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
)
419 ret
=ssl3_handshake_mac(s
,ctx1
,sender
,len
,p
);
421 ret
+=ssl3_handshake_mac(s
,ctx2
,sender
,len
,p
);
425 static int ssl3_handshake_mac(SSL
*s
, EVP_MD_CTX
*in_ctx
,
426 const char *sender
, int len
, unsigned char *p
)
431 unsigned char md_buf
[EVP_MAX_MD_SIZE
];
434 EVP_MD_CTX_copy(&ctx
,in_ctx
);
436 n
=EVP_MD_CTX_size(&ctx
);
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
);
446 EVP_DigestInit(&ctx
,EVP_MD_CTX_md(&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
);
453 memset(&ctx
,0,sizeof(EVP_MD_CTX
));
458 int ssl3_mac(SSL
*ssl
, unsigned char *md
, int send
)
461 unsigned char *mac_sec
,*seq
;
464 unsigned char *p
,rec_char
;
465 unsigned int md_size
;
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
;
477 rec
= &(ssl
->s3
->rrec
);
478 mac_sec
= &(ssl
->s3
->read_mac_secret
[0]);
479 seq
= &(ssl
->s3
->read_sequence
[0]);
483 md_size
=EVP_MD_size(hash
);
484 npad
=(48/md_size
)*md_size
;
486 /* Chop the digest off the end :-) */
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);
493 EVP_DigestUpdate(&md_ctx
,&rec_char
,1);
496 EVP_DigestUpdate(&md_ctx
,md
,2);
497 EVP_DigestUpdate(&md_ctx
,rec
->input
,rec
->length
);
498 EVP_DigestFinal( &md_ctx
,md
,NULL
);
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
);
512 int ssl3_generate_master_secret(SSL
*s
, unsigned char *out
, unsigned char *p
,
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",
521 (const unsigned char *)"\x41",
522 (const unsigned char *)"\x42\x42",
523 (const unsigned char *)"\x43\x43\x43",
526 unsigned char buf
[EVP_MAX_MD_SIZE
];
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]),
538 EVP_DigestUpdate(&ctx
,&(s
->s3
->server_random
[0]),
540 EVP_DigestFinal(&ctx
,buf
,&n
);
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
);
552 int ssl3_alert_code(int code
)
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_RESTRICTION
: 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_CANCELLED
: return(SSL3_AD_HANDSHAKE_FAILURE
);
579 case SSL_AD_NO_RENEGOTIATION
: return(-1); /* Don't send it :-) */