/*

 * Copyright 1995-2020 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 <openssl/crypto.h>

#include "des_local.h"

void DES_string_to_key(const char *str, DES_cblock *key)

{

    DES_key_schedule ks;

    int i, length;

    memset(key, 0, 8);

    length = strlen(str);

    for (i = 0; i < length; i++) {

        register unsigned char j = str[i];

        if ((i % 16) < 8)

            (*key)[i % 8] ^= (j << 1);

        else {

            /* Reverse the bit order 05/05/92 eay */

            j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);

            j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);

            j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);

            (*key)[7 - (i % 8)] ^= j;

        }

    }

    DES_set_odd_parity(key);

    DES_set_key_unchecked(key, &ks);

    DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key);

    OPENSSL_cleanse(&ks, sizeof(ks));

    DES_set_odd_parity(key);

}

void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)

{

    DES_key_schedule ks;

    int i, length;

    memset(key1, 0, 8);

    memset(key2, 0, 8);

    length = strlen(str);

    for (i = 0; i < length; i++) {

        register unsigned char j = str[i];

        if ((i % 32) < 16) {

            if ((i % 16) < 8)

                (*key1)[i % 8] ^= (j << 1);

            else

                (*key2)[i % 8] ^= (j << 1);

        } else {

            j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);

            j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);

            j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);

            if ((i % 16) < 8)

                (*key1)[7 - (i % 8)] ^= j;

            else

                (*key2)[7 - (i % 8)] ^= j;

        }

    }

    if (length <= 8)

        memcpy(key2, key1, 8);

    DES_set_odd_parity(key1);

    DES_set_odd_parity(key2);

    DES_set_key_unchecked(key1, &ks);

    DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);

    DES_set_key_unchecked(key2, &ks);

    DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);

    OPENSSL_cleanse(&ks, sizeof(ks));

    DES_set_odd_parity(key1);

    DES_set_odd_parity(key2);

}