/* $OpenBSD: e_idea.c,v 1.10 2015/09/10 15:56:25 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_IDEA

#include <openssl/evp.h>

#include <openssl/idea.h>

#include <openssl/objects.h>

#include "evp_locl.h"

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

    const unsigned char *iv, int enc);

/* NB idea_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a special

 * case

 */

static int

idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

    const unsigned char *in, size_t inl)

{

  BLOCK_CIPHER_ecb_loop()

  idea_ecb_encrypt(in + i, out + i, ctx->cipher_data);

  return 1;

}

/* Can't use IMPLEMENT_BLOCK_CIPHER because idea_ecb_encrypt is different */

typedef struct {

  IDEA_KEY_SCHEDULE ks;

} EVP_IDEA_KEY;

BLOCK_CIPHER_func_cbc(idea, idea, EVP_IDEA_KEY, ks)

BLOCK_CIPHER_func_ofb(idea, idea, 64, EVP_IDEA_KEY, ks)

BLOCK_CIPHER_func_cfb(idea, idea, 64, EVP_IDEA_KEY, ks)

BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,

    0, idea_init_key, NULL,

    EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)

static int

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

    const unsigned char *iv, int enc)

{

  if (!enc) {

    if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)

      enc = 1;

    else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE)

      enc = 1;

  }

  if (enc)

    idea_set_encrypt_key(key, ctx->cipher_data);

  else {

    IDEA_KEY_SCHEDULE tmp;

    idea_set_encrypt_key(key, &tmp);

    idea_set_decrypt_key(&tmp, ctx->cipher_data);

    explicit_bzero((unsigned char *)&tmp,

        sizeof(IDEA_KEY_SCHEDULE));

  }

  return 1;

}

#endif