/* $OpenBSD: e_des.c,v 1.14 2015/10/12 06:05:52 guenther 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 <openssl/opensslconf.h>

#ifndef OPENSSL_NO_DES

#include <openssl/evp.h>

#include <openssl/des.h>

#include <openssl/objects.h>

#include "evp_locl.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, size_t 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, size_t inl)

{

  while (inl >= EVP_MAXCHUNK) {

    DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,

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

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (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, size_t inl)

{

  while (inl >= EVP_MAXCHUNK) {

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

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

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (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, size_t inl)

{

  while (inl >= EVP_MAXCHUNK) {

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

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

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (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, size_t inl)

{

  size_t n, chunk = EVP_MAXCHUNK/8;

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

  if (inl < chunk)

    chunk = inl;

  while (inl && inl >= chunk) {

    for (n = 0; n < chunk*8; ++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 >> (unsigned int)(n % 8))) |

          ((d[0] & 0x80) >> (unsigned int)(n % 8));

    }

    inl -= chunk;

    in += chunk;

    out += chunk;

    if (inl < chunk)

      chunk = inl;

  }

  return 1;

}

static int

des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

    const unsigned char *in, size_t inl)

{

  while (inl >= EVP_MAXCHUNK) {

    DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,

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

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (inl)

    DES_cfb_encrypt(in, out, 8, (long)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;

  DES_set_key_unchecked(deskey, ctx->cipher_data);

  return 1;

}

static int

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

{

  switch (type) {

  case EVP_CTRL_RAND_KEY:

    if (DES_random_key((DES_cblock *)ptr) == 0)

      return 0;

    return 1;

  default:

    return -1;

  }

}

#endif