/* crypto/evp/e_des.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 <stdio.h>

#include "cryptlib.h"

#ifndef OPENSSL_NO_DES

#include <openssl/evp.h>

#include <openssl/objects.h>

#include "evp_locl.h"

#include <openssl/des.h>

#include <openssl/rand.h>

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			const unsigned char *iv, int enc);

static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

/* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */

static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			  const unsigned char *in, unsigned int inl)

{

	BLOCK_CIPHER_ecb_loop()

		DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);

	return 1;

}

static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			  const unsigned char *in, unsigned int inl)

{

	DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, (DES_cblock *)ctx->iv, &ctx->num);

	return 1;

}

static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			  const unsigned char *in, unsigned int inl)

{

	DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,

			 (DES_cblock *)ctx->iv, ctx->encrypt);

	return 1;

}

static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			    const unsigned char *in, unsigned int inl)

{

	DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,

			  (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);

	return 1;

}

/* Although we have a CFB-r implementation for DES, it doesn't pack the right

   way, so wrap it here */

static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			   const unsigned char *in, unsigned int inl)

    {

    unsigned int n;

    unsigned char c[1],d[1];

    for(n=0 ; n < inl ; ++n)

	{

	c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;

	DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,

			ctx->encrypt);

	out[n/8]=(out[n/8]&~(0x80 >> (n%8)))|((d[0]&0x80) >> (n%8));

	}

    return 1;

    }

static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			   const unsigned char *in, unsigned int inl)

    {

    DES_cfb_encrypt(in,out,8,inl,ctx->cipher_data,(DES_cblock *)ctx->iv,

		    ctx->encrypt);

    return 1;

    }

BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,

			EVP_CIPH_RAND_KEY, des_init_key, NULL,

			EVP_CIPHER_set_asn1_iv,

			EVP_CIPHER_get_asn1_iv,

			des_ctrl)

BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,

		     EVP_CIPH_RAND_KEY, des_init_key,NULL,

		     EVP_CIPHER_set_asn1_iv,

		     EVP_CIPHER_get_asn1_iv,des_ctrl)

BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,

		     EVP_CIPH_RAND_KEY,des_init_key,NULL,

		     EVP_CIPHER_set_asn1_iv,

		     EVP_CIPHER_get_asn1_iv,des_ctrl)

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			const unsigned char *iv, int enc)

	{

	DES_cblock *deskey = (DES_cblock *)key;

#ifdef EVP_CHECK_DES_KEY

	if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)

		return 0;

#else

	DES_set_key_unchecked(deskey,ctx->cipher_data);

#endif

	return 1;

	}

static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

	{

	switch(type)

		{

	case EVP_CTRL_RAND_KEY:

		if (RAND_bytes(ptr, 8) <= 0)

			return 0;

		DES_set_odd_parity((DES_cblock *)ptr);

		return 1;

	default:

		return -1;

		}

	}

#endif