/* crypto/evp/e_des3.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_ede_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			    const unsigned char *iv,int enc);

static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			     const unsigned char *iv,int enc);

static int des3_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct

    {

    DES_key_schedule ks1;/* key schedule */

    DES_key_schedule ks2;/* key schedule (for ede) */

    DES_key_schedule ks3;/* key schedule (for ede3) */

    } DES_EDE_KEY;

#define data(ctx) ((DES_EDE_KEY *)(ctx)->cipher_data)

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

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

			      const unsigned char *in, unsigned int inl)

{

	BLOCK_CIPHER_ecb_loop()

		DES_ecb3_encrypt((const_DES_cblock *)(in + i),

				 (DES_cblock *)(out + i),

				 &data(ctx)->ks1, &data(ctx)->ks2,

				 &data(ctx)->ks3,

				 ctx->encrypt);

	return 1;

}

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

			      const unsigned char *in, unsigned int inl)

{

	DES_ede3_ofb64_encrypt(in, out, (long)inl,

			       &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,

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

	return 1;

}

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

			      const unsigned char *in, unsigned int inl)

{

#ifdef KSSL_DEBUG

	{

        int i;

        char *cp;

	printf("des_ede_cbc_cipher(ctx=%lx, buflen=%d)\n", ctx, ctx->buf_len);

	printf("\t iv= ");

        for(i=0;i<8;i++)

                printf("%02X",ctx->iv[i]);

	printf("\n");

	}

#endif    /* KSSL_DEBUG */

	DES_ede3_cbc_encrypt(in, out, (long)inl,

			     &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,

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

	return 1;

}

static int des_ede_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

			      const unsigned char *in, unsigned int inl)

{

	DES_ede3_cfb64_encrypt(in, out, (long)inl, 

			       &data(ctx)->ks1, &data(ctx)->ks2, &data(ctx)->ks3,

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

	return 1;

}

/* Although we have a CFB-r implementation for 3-DES, it doesn't pack the right

   way, so wrap it here */

static int des_ede3_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_ede3_cfb_encrypt(c,d,1,1,

			     &data(ctx)->ks1,&data(ctx)->ks2,&data(ctx)->ks3,

			     (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_ede3_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

				const unsigned char *in, unsigned int inl)

    {

    DES_ede3_cfb_encrypt(in,out,8,inl,

			 &data(ctx)->ks1,&data(ctx)->ks2,&data(ctx)->ks3,

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

    return 1;

    }

BLOCK_CIPHER_defs(des_ede, DES_EDE_KEY, NID_des_ede, 8, 16, 8, 64,

			EVP_CIPH_RAND_KEY, des_ede_init_key, NULL, 

			EVP_CIPHER_set_asn1_iv,

			EVP_CIPHER_get_asn1_iv,

			des3_ctrl)

#define des_ede3_cfb64_cipher des_ede_cfb64_cipher

#define des_ede3_ofb_cipher des_ede_ofb_cipher

#define des_ede3_cbc_cipher des_ede_cbc_cipher

#define des_ede3_ecb_cipher des_ede_ecb_cipher

BLOCK_CIPHER_defs(des_ede3, DES_EDE_KEY, NID_des_ede3, 8, 24, 8, 64,

			EVP_CIPH_RAND_KEY, des_ede3_init_key, NULL, 

			EVP_CIPHER_set_asn1_iv,

			EVP_CIPHER_get_asn1_iv,

			des3_ctrl)

BLOCK_CIPHER_def_cfb(des_ede3,DES_EDE_KEY,NID_des_ede3,24,8,1,

		     EVP_CIPH_RAND_KEY, des_ede3_init_key,NULL,

		     EVP_CIPHER_set_asn1_iv,

		     EVP_CIPHER_get_asn1_iv,

		     des3_ctrl)

BLOCK_CIPHER_def_cfb(des_ede3,DES_EDE_KEY,NID_des_ede3,24,8,8,

		     EVP_CIPH_RAND_KEY, des_ede3_init_key,NULL,

		     EVP_CIPHER_set_asn1_iv,

		     EVP_CIPHER_get_asn1_iv,

		     des3_ctrl)

static int des_ede_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[0],&data(ctx)->ks1)

		!! DES_set_key_checked(&deskey[1],&data(ctx)->ks2))

		return 0;

#else

	DES_set_key_unchecked(&deskey[0],&data(ctx)->ks1);

	DES_set_key_unchecked(&deskey[1],&data(ctx)->ks2);

#endif

	memcpy(&data(ctx)->ks3,&data(ctx)->ks1,

	       sizeof(data(ctx)->ks1));

	return 1;

	}

static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

			     const unsigned char *iv, int enc)

	{

	DES_cblock *deskey = (DES_cblock *)key;

#ifdef KSSL_DEBUG

	{

        int i;

        printf("des_ede3_init_key(ctx=%lx)\n", ctx);

	printf("\tKEY= ");

        for(i=0;i<24;i++) printf("%02X",key[i]); printf("\n");

	printf("\t IV= ");

        for(i=0;i<8;i++) printf("%02X",iv[i]); printf("\n");

	}

#endif	/* KSSL_DEBUG */

#ifdef EVP_CHECK_DES_KEY

	if (DES_set_key_checked(&deskey[0],&data(ctx)->ks1)

		|| DES_set_key_checked(&deskey[1],&data(ctx)->ks2)

		|| DES_set_key_checked(&deskey[2],&data(ctx)->ks3))

		return 0;

#else

	DES_set_key_unchecked(&deskey[0],&data(ctx)->ks1);

	DES_set_key_unchecked(&deskey[1],&data(ctx)->ks2);

	DES_set_key_unchecked(&deskey[2],&data(ctx)->ks3);

#endif

	return 1;

	}

static int des3_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

	{

	DES_cblock *deskey = ptr;

	switch(type)

		{

	case EVP_CTRL_RAND_KEY:

		if (RAND_bytes(ptr, c->key_len) <= 0)

			return 0;

		DES_set_odd_parity(deskey);

		if (c->key_len >= 16)

			DES_set_odd_parity(deskey + 1);

		if (c->key_len >= 24)

			DES_set_odd_parity(deskey + 2);

		return 1;

	default:

		return -1;

		}

	}

EXPORT_C const EVP_CIPHER *EVP_des_ede(void)

{

	return &des_ede_ecb;

}

EXPORT_C const EVP_CIPHER *EVP_des_ede3(void)

{

	return &des_ede3_ecb;

}

#endif