/* 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
