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