/* $OpenBSD: e_xcbc_d.c,v 1.12 2014/07/11 08:44:48 jsing Exp $ */

/* 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 <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_DES

#include <openssl/des.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include "evp_locl.h"

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

    const unsigned char *iv, int enc);

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

    const unsigned char *in, size_t inl);

typedef struct {

  DES_key_schedule ks;/* key schedule */

  DES_cblock inw;

  DES_cblock outw;

} DESX_CBC_KEY;

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

static const EVP_CIPHER d_xcbc_cipher = {

  NID_desx_cbc,

  8, 24, 8,

  EVP_CIPH_CBC_MODE,

  desx_cbc_init_key,

  desx_cbc_cipher,

  NULL,

  sizeof(DESX_CBC_KEY),

  EVP_CIPHER_set_asn1_iv,

  EVP_CIPHER_get_asn1_iv,

  NULL,

  NULL

};

const EVP_CIPHER *

EVP_desx_cbc(void)

{

  return (&d_xcbc_cipher);

}

static int

desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

    const unsigned char *iv, int enc)

{

  DES_cblock *deskey = (DES_cblock *)key;

  DES_set_key_unchecked(deskey, &data(ctx)->ks);

  memcpy(&data(ctx)->inw[0], &key[8], 8);

  memcpy(&data(ctx)->outw[0], &key[16], 8);

  return 1;

}

static int

desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

    const unsigned char *in, size_t inl)

{

  while (inl >= EVP_MAXCHUNK) {

    DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,

        (DES_cblock *)&(ctx->iv[0]), &data(ctx)->inw,

        &data(ctx)->outw, ctx->encrypt);

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (inl)

    DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,

        (DES_cblock *)&(ctx->iv[0]), &data(ctx)->inw,

        &data(ctx)->outw, ctx->encrypt);

  return 1;

}

#endif