/* ssl/ssl_rc2.c */
/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 * 
 * This file is part of an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * The implementation was written so as to conform with Netscapes SSL
 * specification.  This library and applications are
 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 * as long as the following conditions are aheared to.
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.  If this code is used in a product,
 * Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au)
 * 
 * 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.]
 */

#ifndef NO_RC2

#include <stdio.h>
#include "rc2.h"
#ifdef NO_MD5
#include <md5.h>
#else
#include "md5.h"
#endif
#include "ssl_locl.h"
#include "ssl_rc2.h"

int ssl_enc_rc2_cbc_init(s, client)
SSL *s;
int client;
	{
	unsigned char *md5d1,*md5d2;
	RC2_CBC_STATE *ds;

	if (s->crypt_state == NULL)
		s->crypt_state=(char *)Malloc(sizeof(RC2_CBC_STATE));
	if (s->crypt_state == NULL) goto err;
	ds=(RC2_CBC_STATE *)s->crypt_state;

	if (s->key_material != NULL)
		{
		memset(s->key_material,0,s->key_material_length);
		Free(s->key_material);
		}
	md5d1=s->key_material=(unsigned char *)Malloc(MD5_DIGEST_LENGTH*2);
	if (s->key_material == NULL) goto err;
	md5d2= &(s->key_material[MD5_DIGEST_LENGTH]);
	s->key_material_length=MD5_DIGEST_LENGTH*2;

	ssl_generate_key_material(s);

	if (client)
		{
		RC2_set_key(&(ds->rc2_read_ks),16,md5d1,128);
		RC2_set_key(&(ds->rc2_write_ks),16,md5d2,128);
		s->read_key= md5d1;
		s->write_key= md5d2;
		}
	else
		{
		RC2_set_key(&(ds->rc2_read_ks),16,md5d2,128);
		RC2_set_key(&(ds->rc2_write_ks),16,md5d1,128);
		s->read_key= md5d2;
		s->write_key= md5d1;
		}

	memcpy(ds->read_iv,s->session->key_arg,RC2_BLOCK);
	memcpy(ds->write_iv,s->session->key_arg,RC2_BLOCK);
	return(1);
err:
	SSLerr(SSL_F_SSL_ENC_RC2_CBC_INIT,ERR_R_MALLOC_FAILURE);
	return(0);
	}

/* read/writes from s->mac_data using length for encrypt and 
 * decrypt.  It sets the s->padding, s->length and s->pad_data ptr if we
 * are encrypting */
void ssl_enc_rc2_cbc(s)
SSL *s;
	{
	RC2_CBC_STATE *ds;
	unsigned long l;

	ds=(RC2_CBC_STATE *)s->crypt_state;

	l=s->length;
	l=(l+7)/8*8;

#ifdef DES_DEBUG
	SSL_TRACE(SSL_ERR,"RC2 CBC length=%d\n",s->length);
	ssl_print_bytes(SSL_ERR,l,s->mac_data);
	SSL_TRACE(SSL_ERR,"\n");
#endif
	if (s->send)
		{
		RC2_cbc_encrypt(s->mac_data, s->mac_data,(long)l,
			&(ds->rc2_write_ks),ds->write_iv, RC2_ENCRYPT);
		}
	else
		{
		RC2_cbc_encrypt(s->mac_data,s->mac_data,(long)l,
			&(ds->rc2_read_ks),ds->read_iv,RC2_DECRYPT);
		}

#ifdef DES_DEBUG
	ssl_print_bytes(SSL_ERR,l,s->mac_data);
	SSL_TRACE(SSL_ERR,"\n");
#endif
	}

#endif
