/*

 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * IDEA low level APIs are deprecated for public use, but still ok for internal

 * use where we're using them to implement the higher level EVP interface, as is

 * the case here.

 */

#include "internal/deprecated.h"

#include <stdio.h>

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_IDEA

# include <openssl/evp.h>

# include <openssl/objects.h>

# include "crypto/evp.h"

# include <openssl/idea.h>

# include "evp_local.h"

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

typedef struct {

    IDEA_KEY_SCHEDULE ks;

} EVP_IDEA_KEY;

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, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);

    return 1;

}

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_get_mode(ctx) == EVP_CIPH_OFB_MODE)

            enc = 1;

        else if (EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_CFB_MODE)

            enc = 1;

    }

    if (enc)

        IDEA_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);

    else {

        IDEA_KEY_SCHEDULE tmp;

        IDEA_set_encrypt_key(key, &tmp);

        IDEA_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);

        OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));

    }

    return 1;

}

#endif