/* 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 <openssl/cipher.h>

#include <openssl/des.h>

#include <openssl/nid.h>

#include "../des/internal.h"

#include "../fipsmodule/cipher/internal.h"

#include "internal.h"

typedef struct {

  union {

    double align;

    DES_key_schedule ks;

  } ks;

} EVP_DES_KEY;

static int des_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,

                        const uint8_t *iv, int enc) {

  EVP_DES_KEY *dat = (EVP_DES_KEY *)ctx->cipher_data;

  DES_set_key_ex(key, &dat->ks.ks);

  return 1;

}

static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,

                          size_t in_len) {

  EVP_DES_KEY *dat = (EVP_DES_KEY *)ctx->cipher_data;

  DES_ncbc_encrypt_ex(in, out, in_len, &dat->ks.ks, ctx->iv, ctx->encrypt);

  return 1;

}

static const EVP_CIPHER evp_des_cbc = {

    .nid = NID_des_cbc,

    .block_size = 8,

    .key_len = 8,

    .iv_len = 8,

    .ctx_size = sizeof(EVP_DES_KEY),

    .flags = EVP_CIPH_CBC_MODE,

    .init = des_init_key,

    .cipher = des_cbc_cipher,

};

const EVP_CIPHER *EVP_des_cbc(void) { return &evp_des_cbc; }

static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,

                          size_t in_len) {

  if (in_len < ctx->cipher->block_size) {

    return 1;

  }

  in_len -= ctx->cipher->block_size;

  EVP_DES_KEY *dat = (EVP_DES_KEY *)ctx->cipher_data;

  for (size_t i = 0; i <= in_len; i += ctx->cipher->block_size) {

    DES_ecb_encrypt_ex(in + i, out + i, &dat->ks.ks, ctx->encrypt);

  }

  return 1;

}

static const EVP_CIPHER evp_des_ecb = {

    .nid = NID_des_ecb,

    .block_size = 8,

    .key_len = 8,

    .iv_len = 0,

    .ctx_size = sizeof(EVP_DES_KEY),

    .flags = EVP_CIPH_ECB_MODE,

    .init = des_init_key,

    .cipher = des_ecb_cipher,

};

const EVP_CIPHER *EVP_des_ecb(void) { return &evp_des_ecb; }

typedef struct {

  union {

    double align;

    DES_key_schedule ks[3];

  } ks;

} DES_EDE_KEY;

static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,

                             const uint8_t *iv, int enc) {

  DES_EDE_KEY *dat = (DES_EDE_KEY *)ctx->cipher_data;

  DES_set_key_ex(key, &dat->ks.ks[0]);

  DES_set_key_ex(key + 8, &dat->ks.ks[1]);

  DES_set_key_ex(key + 16, &dat->ks.ks[2]);

  return 1;

}

static int des_ede3_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,

                               const uint8_t *in, size_t in_len) {

  DES_EDE_KEY *dat = (DES_EDE_KEY *)ctx->cipher_data;

  DES_ede3_cbc_encrypt_ex(in, out, in_len, &dat->ks.ks[0], &dat->ks.ks[1],

                          &dat->ks.ks[2], ctx->iv, ctx->encrypt);

  return 1;

}

static const EVP_CIPHER evp_des_ede3_cbc = {

    .nid = NID_des_ede3_cbc,

    .block_size = 8,

    .key_len = 24,

    .iv_len = 8,

    .ctx_size = sizeof(DES_EDE_KEY),

    .flags = EVP_CIPH_CBC_MODE,

    .init = des_ede3_init_key,

    .cipher = des_ede3_cbc_cipher,

};

const EVP_CIPHER *EVP_des_ede3_cbc(void) { return &evp_des_ede3_cbc; }

static int des_ede_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,

                            const uint8_t *iv, int enc) {

  DES_EDE_KEY *dat = (DES_EDE_KEY *)ctx->cipher_data;

  // 2-DES is 3-DES with the first key used twice.

  DES_set_key_ex(key, &dat->ks.ks[0]);

  DES_set_key_ex(key + 8, &dat->ks.ks[1]);

  DES_set_key_ex(key, &dat->ks.ks[2]);

  return 1;

}

static const EVP_CIPHER evp_des_ede_cbc = {

    .nid = NID_des_ede_cbc,

    .block_size = 8,

    .key_len = 16,

    .iv_len = 8,

    .ctx_size = sizeof(DES_EDE_KEY),

    .flags = EVP_CIPH_CBC_MODE,

    .init = des_ede_init_key,

    .cipher = des_ede3_cbc_cipher,

};

const EVP_CIPHER *EVP_des_ede_cbc(void) { return &evp_des_ede_cbc; }

static int des_ede_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,

                              const uint8_t *in, size_t in_len) {

  if (in_len < ctx->cipher->block_size) {

    return 1;

  }

  in_len -= ctx->cipher->block_size;

  DES_EDE_KEY *dat = (DES_EDE_KEY *) ctx->cipher_data;

  for (size_t i = 0; i <= in_len; i += ctx->cipher->block_size) {

    DES_ecb3_encrypt_ex(in + i, out + i, &dat->ks.ks[0], &dat->ks.ks[1],

                        &dat->ks.ks[2], ctx->encrypt);

  }

  return 1;

}

static const EVP_CIPHER evp_des_ede = {

    .nid = NID_des_ede_ecb,

    .block_size = 8,

    .key_len = 16,

    .iv_len = 0,

    .ctx_size = sizeof(DES_EDE_KEY),

    .flags = EVP_CIPH_ECB_MODE,

    .init = des_ede_init_key,

    .cipher = des_ede_ecb_cipher,

};

const EVP_CIPHER *EVP_des_ede(void) { return &evp_des_ede; }

static const EVP_CIPHER evp_des_ede3 = {

    .nid = NID_des_ede3_ecb,

    .block_size = 8,

    .key_len = 24,

    .iv_len = 0,

    .ctx_size = sizeof(DES_EDE_KEY),

    .flags = EVP_CIPH_ECB_MODE,

    .init = des_ede3_init_key,

    .cipher = des_ede_ecb_cipher,

};

const EVP_CIPHER *EVP_des_ede3(void) { return &evp_des_ede3; }

const EVP_CIPHER *EVP_des_ede3_ecb(void) { return EVP_des_ede3(); }