/*

 * 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

 */

/*

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

 * use.

 */

#include "internal/deprecated.h"

#include <stdio.h>

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_DES

# include <openssl/evp.h>

# include <openssl/objects.h>

# include "crypto/evp.h"

# include <openssl/des.h>

# include "evp_local.h"

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

                             const unsigned char *iv, int enc);

static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                           const unsigned char *in, size_t inl);

typedef struct {

    DES_key_schedule ks;        /* key schedule */

    DES_cblock inw;

    DES_cblock outw;

} DESX_CBC_KEY;

# define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)

static const EVP_CIPHER d_xcbc_cipher = {

    NID_desx_cbc,

    8, 24, 8,

    EVP_CIPH_CBC_MODE,

    EVP_ORIG_GLOBAL,

    desx_cbc_init_key,

    desx_cbc_cipher,

    NULL,

    sizeof(DESX_CBC_KEY),

    EVP_CIPHER_set_asn1_iv,

    EVP_CIPHER_get_asn1_iv,

    NULL,

    NULL

};

const EVP_CIPHER *EVP_desx_cbc(void)

{

    return &d_xcbc_cipher;

}

static int desx_cbc_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, &data(ctx)->ks);

    memcpy(&data(ctx)->inw[0], &key[8], 8);

    memcpy(&data(ctx)->outw[0], &key[16], 8);

    return 1;

}

static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                           const unsigned char *in, size_t inl)

{

    while (inl >= EVP_MAXCHUNK) {

        DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,

                         (DES_cblock *)ctx->iv,

                         &data(ctx)->inw, &data(ctx)->outw,

                         EVP_CIPHER_CTX_is_encrypting(ctx));

        inl -= EVP_MAXCHUNK;

        in += EVP_MAXCHUNK;

        out += EVP_MAXCHUNK;

    }

    if (inl)

        DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,

                         (DES_cblock *)ctx->iv,

                         &data(ctx)->inw, &data(ctx)->outw,

                         EVP_CIPHER_CTX_is_encrypting(ctx));

    return 1;

}

#endif