198 lines
6.9 KiB
C
198 lines
6.9 KiB
C
|
/* ssl/s2_enc.c */
|
||
|
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This package is an SSL implementation written
|
||
|
|
* by Eric Young (eay@cryptsoft.com).
|
||
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
||
|
|
*
|
||
|
|
* This library is free for commercial and non-commercial use as long as
|
||
|
|
* the following conditions are aheared to. The following conditions
|
||
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
||
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
||
|
|
* included with this distribution is covered by the same copyright terms
|
||
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
||
|
|
*
|
||
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
||
|
|
* the code are not to be removed.
|
||
|
|
* If this package is used in a product, Eric Young should be given attribution
|
||
|
|
* as the author of the parts of the library used.
|
||
|
|
* This can be in the form of a textual message at program startup or
|
||
|
|
* in documentation (online or textual) provided with the package.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. All advertising materials mentioning features or use of this software
|
||
|
|
* must display the following acknowledgement:
|
||
|
|
* "This product includes cryptographic software written by
|
||
|
|
* Eric Young (eay@cryptsoft.com)"
|
||
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
||
|
|
* being used are not cryptographic related :-).
|
||
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
||
|
|
* the apps directory (application code) you must include an acknowledgement:
|
||
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
* The licence and distribution terms for any publically available version or
|
||
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
||
|
|
* copied and put under another distribution licence
|
||
|
|
* [including the GNU Public Licence.]
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ssl_locl.h"
|
||
|
|
#ifndef OPENSSL_NO_SSL2
|
||
|
|
# include <stdio.h>
|
||
|
|
|
||
|
|
int ssl2_enc_init(SSL *s, int client)
|
||
|
|
{
|
||
|
|
/* Max number of bytes needed */
|
||
|
|
EVP_CIPHER_CTX *rs, *ws;
|
||
|
|
const EVP_CIPHER *c;
|
||
|
|
const EVP_MD *md;
|
||
|
|
int num;
|
||
|
|
|
||
|
|
if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) {
|
||
|
|
ssl2_return_error(s, SSL2_PE_NO_CIPHER);
|
||
|
|
SSLerr(SSL_F_SSL2_ENC_INIT, SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
ssl_replace_hash(&s->read_hash, md);
|
||
|
|
ssl_replace_hash(&s->write_hash, md);
|
||
|
|
|
||
|
|
if ((s->enc_read_ctx == NULL) && ((s->enc_read_ctx = (EVP_CIPHER_CTX *)
|
||
|
|
OPENSSL_malloc(sizeof(EVP_CIPHER_CTX)))
|
||
|
|
== NULL))
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* make sure it's intialized in case the malloc for enc_write_ctx fails
|
||
|
|
* and we exit with an error
|
||
|
|
*/
|
||
|
|
rs = s->enc_read_ctx;
|
||
|
|
EVP_CIPHER_CTX_init(rs);
|
||
|
|
|
||
|
|
if ((s->enc_write_ctx == NULL) && ((s->enc_write_ctx = (EVP_CIPHER_CTX *)
|
||
|
|
OPENSSL_malloc(sizeof
|
||
|
|
(EVP_CIPHER_CTX))) ==
|
||
|
|
NULL))
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
ws = s->enc_write_ctx;
|
||
|
|
EVP_CIPHER_CTX_init(ws);
|
||
|
|
|
||
|
|
num = c->key_len;
|
||
|
|
s->s2->key_material_length = num * 2;
|
||
|
|
OPENSSL_assert(s->s2->key_material_length <= sizeof(s->s2->key_material));
|
||
|
|
|
||
|
|
if (ssl2_generate_key_material(s) <= 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
OPENSSL_assert(c->iv_len <= (int)sizeof(s->session->key_arg));
|
||
|
|
EVP_EncryptInit_ex(ws, c, NULL,
|
||
|
|
&(s->s2->key_material[(client) ? num : 0]),
|
||
|
|
s->session->key_arg);
|
||
|
|
EVP_DecryptInit_ex(rs, c, NULL,
|
||
|
|
&(s->s2->key_material[(client) ? 0 : num]),
|
||
|
|
s->session->key_arg);
|
||
|
|
s->s2->read_key = &(s->s2->key_material[(client) ? 0 : num]);
|
||
|
|
s->s2->write_key = &(s->s2->key_material[(client) ? num : 0]);
|
||
|
|
return (1);
|
||
|
|
err:
|
||
|
|
SSLerr(SSL_F_SSL2_ENC_INIT, ERR_R_MALLOC_FAILURE);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* read/writes from s->s2->mac_data using length for encrypt and decrypt.
|
||
|
|
* It sets s->s2->padding and s->[rw]length if we are encrypting Returns 0 on
|
||
|
|
* error and 1 on success
|
||
|
|
*/
|
||
|
|
int ssl2_enc(SSL *s, int send)
|
||
|
|
{
|
||
|
|
EVP_CIPHER_CTX *ds;
|
||
|
|
unsigned long l;
|
||
|
|
int bs;
|
||
|
|
|
||
|
|
if (send) {
|
||
|
|
ds = s->enc_write_ctx;
|
||
|
|
l = s->s2->wlength;
|
||
|
|
} else {
|
||
|
|
ds = s->enc_read_ctx;
|
||
|
|
l = s->s2->rlength;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* check for NULL cipher */
|
||
|
|
if (ds == NULL)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
bs = ds->cipher->block_size;
|
||
|
|
/*
|
||
|
|
* This should be using (bs-1) and bs instead of 7 and 8, but what the
|
||
|
|
* hell.
|
||
|
|
*/
|
||
|
|
if (bs == 8)
|
||
|
|
l = (l + 7) / 8 * 8;
|
||
|
|
|
||
|
|
if (EVP_Cipher(ds, s->s2->mac_data, s->s2->mac_data, l) < 1)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ssl2_mac(SSL *s, unsigned char *md, int send)
|
||
|
|
{
|
||
|
|
EVP_MD_CTX c;
|
||
|
|
unsigned char sequence[4], *p, *sec, *act;
|
||
|
|
unsigned long seq;
|
||
|
|
unsigned int len;
|
||
|
|
|
||
|
|
if (send) {
|
||
|
|
seq = s->s2->write_sequence;
|
||
|
|
sec = s->s2->write_key;
|
||
|
|
len = s->s2->wact_data_length;
|
||
|
|
act = s->s2->wact_data;
|
||
|
|
} else {
|
||
|
|
seq = s->s2->read_sequence;
|
||
|
|
sec = s->s2->read_key;
|
||
|
|
len = s->s2->ract_data_length;
|
||
|
|
act = s->s2->ract_data;
|
||
|
|
}
|
||
|
|
|
||
|
|
p = &(sequence[0]);
|
||
|
|
l2n(seq, p);
|
||
|
|
|
||
|
|
/* There has to be a MAC algorithm. */
|
||
|
|
EVP_MD_CTX_init(&c);
|
||
|
|
EVP_MD_CTX_copy(&c, s->read_hash);
|
||
|
|
EVP_DigestUpdate(&c, sec, EVP_CIPHER_CTX_key_length(s->enc_read_ctx));
|
||
|
|
EVP_DigestUpdate(&c, act, len);
|
||
|
|
/* the above line also does the pad data */
|
||
|
|
EVP_DigestUpdate(&c, sequence, 4);
|
||
|
|
EVP_DigestFinal_ex(&c, md, NULL);
|
||
|
|
EVP_MD_CTX_cleanup(&c);
|
||
|
|
}
|
||
|
|
#else /* !OPENSSL_NO_SSL2 */
|
||
|
|
|
||
|
|
# if PEDANTIC
|
||
|
|
static void *dummy = &dummy;
|
||
|
|
# endif
|
||
|
|
|
||
|
|
#endif
|