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/* nettle-openssl.c
 *
 * Glue that's used only by the benchmark, and subject to change.
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2002 Niels Möller
 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * The nettle library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02111-1301, USA.
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

/* Openssl glue, for comparative benchmarking only */

#if WITH_OPENSSL

/* No ancient ssleay compatibility */
#define NCOMPAT
#define OPENSSL_DISABLE_OLD_DES_SUPPORT

#include <assert.h>

#include <openssl/aes.h>
#include <openssl/blowfish.h>
#include <openssl/des.h>
#include <openssl/cast.h>
#include <openssl/rc4.h>

#include <openssl/md5.h>
#include <openssl/sha.h>

#include "nettle-internal.h"


/* AES */
static nettle_set_key_func openssl_aes_set_encrypt_key;
static void
openssl_aes_set_encrypt_key(void *ctx, unsigned length, const uint8_t *key)
{
  AES_set_encrypt_key(key, length * 8, ctx);
}

static nettle_set_key_func openssl_aes_set_decrypt_key;
static void
openssl_aes_set_decrypt_key(void *ctx, unsigned length, const uint8_t *key)
{
  AES_set_decrypt_key(key, length * 8, ctx);
}

static nettle_crypt_func openssl_aes_encrypt;
static void
openssl_aes_encrypt(void *ctx, unsigned length,
		    uint8_t *dst, const uint8_t *src)
{
  assert (!(length % AES_BLOCK_SIZE));
  while (length)
    {
      AES_ecb_encrypt(src, dst, ctx, AES_ENCRYPT);
      length -= AES_BLOCK_SIZE;
      dst += AES_BLOCK_SIZE;
      src += AES_BLOCK_SIZE;
    }
}

static nettle_crypt_func openssl_aes_decrypt;
static void
openssl_aes_decrypt(void *ctx, unsigned length,
		    uint8_t *dst, const uint8_t *src)
{
  assert (!(length % AES_BLOCK_SIZE));
  while (length)
    {
      AES_ecb_encrypt(src, dst, ctx, AES_DECRYPT);
      length -= AES_BLOCK_SIZE;
      dst += AES_BLOCK_SIZE;
      src += AES_BLOCK_SIZE;
    }
}

const struct nettle_cipher
nettle_openssl_aes128 = {
  "openssl aes128", sizeof(AES_KEY),
  16, 16,
  openssl_aes_set_encrypt_key, openssl_aes_set_decrypt_key,
  openssl_aes_encrypt, openssl_aes_decrypt
};

const struct nettle_cipher
nettle_openssl_aes192 = {
  "openssl aes192", sizeof(AES_KEY),
  /* Claim no block size, so that the benchmark doesn't try CBC mode
   * (as openssl cipher + nettle cbc is somewhat pointless to
   * benchmark). */
  16, 24,
  openssl_aes_set_encrypt_key, openssl_aes_set_decrypt_key,
  openssl_aes_encrypt, openssl_aes_decrypt
};

const struct nettle_cipher
nettle_openssl_aes256 = {
  "openssl aes256", sizeof(AES_KEY),
  /* Claim no block size, so that the benchmark doesn't try CBC mode
   * (as openssl cipher + nettle cbc is somewhat pointless to
   * benchmark). */
  16, 32,
  openssl_aes_set_encrypt_key, openssl_aes_set_decrypt_key,
  openssl_aes_encrypt, openssl_aes_decrypt
};

/* Arcfour */
static nettle_set_key_func openssl_arcfour_set_key;
static void
openssl_arcfour_set_key(void *ctx, unsigned length, const uint8_t *key)
{
  RC4_set_key(ctx, length, key);
}

static nettle_crypt_func openssl_arcfour_crypt;
static void
openssl_arcfour_crypt(void *ctx, unsigned length,
		      uint8_t *dst, const uint8_t *src)
{
  RC4(ctx, length, src, dst);
}

const struct nettle_cipher
nettle_openssl_arcfour128 = {
  "openssl arcfour128", sizeof(RC4_KEY),
  0, 16,
  openssl_arcfour_set_key, openssl_arcfour_set_key,
  openssl_arcfour_crypt, openssl_arcfour_crypt
};

/* Blowfish */
static nettle_set_key_func openssl_bf_set_key;
static void
openssl_bf_set_key(void *ctx, unsigned length, const uint8_t *key)
{
  BF_set_key(ctx, length, key);
}

static nettle_crypt_func openssl_bf_encrypt;
static void
openssl_bf_encrypt(void *ctx, unsigned length,
		   uint8_t *dst, const uint8_t *src)
{
  assert (!(length % BF_BLOCK));
  while (length)
    {
      BF_ecb_encrypt(src, dst, ctx, BF_ENCRYPT);
      length -= BF_BLOCK;
      dst += BF_BLOCK;
      src += BF_BLOCK;
    }
}

static nettle_crypt_func openssl_bf_decrypt;
static void
openssl_bf_decrypt(void *ctx, unsigned length,
		   uint8_t *dst, const uint8_t *src)
{
  assert (!(length % BF_BLOCK));
  while (length)
    {
      BF_ecb_encrypt(src, dst, ctx, BF_DECRYPT);
      length -= BF_BLOCK;
      dst += BF_BLOCK;
      src += BF_BLOCK;
    }
}

const struct nettle_cipher
nettle_openssl_blowfish128 = {
  "openssl bf128", sizeof(BF_KEY),
  8, 16,
  openssl_bf_set_key, openssl_bf_set_key,
  openssl_bf_encrypt, openssl_bf_decrypt
};


/* DES */
static nettle_set_key_func openssl_des_set_key;
static void
openssl_des_set_key(void *ctx, unsigned length, const uint8_t *key)
{
  assert(length == 8);  
  /* Not sure what "unchecked" means. We want to ignore parity bits,
     but it would still make sense to check for weak keys. */
  /* Explicit cast used as I don't want to care about openssl's broken
     array typedefs DES_cblock and const_DES_cblock. */
  DES_set_key_unchecked( (void *) key, ctx);
}

#define DES_BLOCK_SIZE 8

static nettle_crypt_func openssl_des_encrypt;
static void
openssl_des_encrypt(void *ctx, unsigned length,
		    uint8_t *dst, const uint8_t *src)
{
  assert (!(length % DES_BLOCK_SIZE));
  while (length)
    {
      DES_ecb_encrypt((void *) src, (void *) dst, ctx, DES_ENCRYPT);
      length -= DES_BLOCK_SIZE;
      dst += DES_BLOCK_SIZE;
      src += DES_BLOCK_SIZE;
    }
}

static nettle_crypt_func openssl_des_decrypt;
static void
openssl_des_decrypt(void *ctx, unsigned length,
		    uint8_t *dst, const uint8_t *src)
{
  assert (!(length % DES_BLOCK_SIZE));
  while (length)
    {
      DES_ecb_encrypt((void *) src, (void *) dst, ctx, DES_DECRYPT);
      length -= DES_BLOCK_SIZE;
      dst += DES_BLOCK_SIZE;
      src += DES_BLOCK_SIZE;
    }
}

const struct nettle_cipher
nettle_openssl_des = {
  "openssl des", sizeof(DES_key_schedule),
  8, 8,
  openssl_des_set_key, openssl_des_set_key,
  openssl_des_encrypt, openssl_des_decrypt
};


/* Cast128 */
static nettle_set_key_func openssl_cast_set_key;
static void
openssl_cast_set_key(void *ctx, unsigned length, const uint8_t *key)
{
  CAST_set_key(ctx, length, key);
}

static nettle_crypt_func openssl_cast_encrypt;
static void
openssl_cast_encrypt(void *ctx, unsigned length,
		     uint8_t *dst, const uint8_t *src)
{
  assert (!(length % CAST_BLOCK));
  while (length)
    {
      CAST_ecb_encrypt(src, dst, ctx, CAST_ENCRYPT);
      length -= CAST_BLOCK;
      dst += CAST_BLOCK;
      src += CAST_BLOCK;
    }
}

static nettle_crypt_func openssl_cast_decrypt;
static void
openssl_cast_decrypt(void *ctx, unsigned length,
		     uint8_t *dst, const uint8_t *src)
{
  assert (!(length % CAST_BLOCK));
  while (length)
    {
      CAST_ecb_encrypt(src, dst, ctx, CAST_DECRYPT);
      length -= CAST_BLOCK;
      dst += CAST_BLOCK;
      src += CAST_BLOCK;
    }
}

const struct nettle_cipher
nettle_openssl_cast128 = {
  "openssl cast128", sizeof(CAST_KEY),
  8, CAST_KEY_LENGTH,
  openssl_cast_set_key, openssl_cast_set_key,
  openssl_cast_encrypt, openssl_cast_decrypt
};

/* Hash functions */

/* md5 */
static nettle_hash_init_func openssl_md5_init;
static void
openssl_md5_init(void *ctx)
{
  MD5_Init(ctx);
}

static nettle_hash_update_func openssl_md5_update;
static void
openssl_md5_update(void *ctx,
		    unsigned length,
		    const uint8_t *src)
{
  MD5_Update(ctx, src, length);
}

static nettle_hash_digest_func openssl_md5_digest;
static void
openssl_md5_digest(void *ctx,
		    unsigned length, uint8_t *dst)
{
  assert(length == SHA_DIGEST_LENGTH);
  MD5_Final(dst, ctx);
  MD5_Init(ctx);
}

const struct nettle_hash
nettle_openssl_md5 = {
  "openssl md5", sizeof(SHA_CTX),
  SHA_DIGEST_LENGTH, SHA_CBLOCK,
  openssl_md5_init,
  openssl_md5_update,
  openssl_md5_digest
};

/* sha1 */
static nettle_hash_init_func openssl_sha1_init;
static void
openssl_sha1_init(void *ctx)
{
  SHA1_Init(ctx);
}

static nettle_hash_update_func openssl_sha1_update;
static void
openssl_sha1_update(void *ctx,
		    unsigned length,
		    const uint8_t *src)
{
  SHA1_Update(ctx, src, length);
}

static nettle_hash_digest_func openssl_sha1_digest;
static void
openssl_sha1_digest(void *ctx,
		    unsigned length, uint8_t *dst)
{
  assert(length == SHA_DIGEST_LENGTH);
  SHA1_Final(dst, ctx);
  SHA1_Init(ctx);
}

const struct nettle_hash
nettle_openssl_sha1 = {
  "openssl sha1", sizeof(SHA_CTX),
  SHA_DIGEST_LENGTH, SHA_CBLOCK,
  openssl_sha1_init,
  openssl_sha1_update,
  openssl_sha1_digest
};
  
#endif /* WITH_OPENSSL */