sl@0: /* crypto/evp/e_xcbc_d.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 <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: 
sl@0: #ifndef OPENSSL_NO_DES
sl@0: 
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/objects.h>
sl@0: #include <openssl/des.h>
sl@0: 
sl@0: static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
sl@0: 			     const unsigned char *iv,int enc);
sl@0: static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
sl@0: 			   const unsigned char *in, unsigned int inl);
sl@0: 
sl@0: 
sl@0: typedef struct
sl@0:     {
sl@0:     DES_key_schedule ks;/* key schedule */
sl@0:     DES_cblock inw;
sl@0:     DES_cblock outw;
sl@0:     } DESX_CBC_KEY;
sl@0: 
sl@0: #define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data)
sl@0: 
sl@0: static const EVP_CIPHER d_xcbc_cipher=
sl@0: 	{
sl@0: 	NID_desx_cbc,
sl@0: 	8,24,8,
sl@0: 	EVP_CIPH_CBC_MODE,
sl@0: 	desx_cbc_init_key,
sl@0: 	desx_cbc_cipher,
sl@0: 	NULL,
sl@0: 	sizeof(DESX_CBC_KEY),
sl@0: 	EVP_CIPHER_set_asn1_iv,
sl@0: 	EVP_CIPHER_get_asn1_iv,
sl@0: 	NULL,
sl@0: 	NULL
sl@0: 	};
sl@0: 
sl@0: EXPORT_C const EVP_CIPHER *EVP_desx_cbc(void)
sl@0: 	{
sl@0: 	return(&d_xcbc_cipher);
sl@0: 	}
sl@0: 	
sl@0: static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
sl@0: 			     const unsigned char *iv, int enc)
sl@0: 	{
sl@0: 	DES_cblock *deskey = (DES_cblock *)key;
sl@0: 
sl@0: 	DES_set_key_unchecked(deskey,&data(ctx)->ks);
sl@0: 	memcpy(&data(ctx)->inw[0],&key[8],8);
sl@0: 	memcpy(&data(ctx)->outw[0],&key[16],8);
sl@0: 
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
sl@0: 			   const unsigned char *in, unsigned int inl)
sl@0: 	{
sl@0: 	DES_xcbc_encrypt(in,out,inl,&data(ctx)->ks,
sl@0: 			 (DES_cblock *)&(ctx->iv[0]),
sl@0: 			 &data(ctx)->inw,
sl@0: 			 &data(ctx)->outw,
sl@0: 			 ctx->encrypt);
sl@0: 	return 1;
sl@0: 	}
sl@0: #endif