str2key.c
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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
*/
#include <openssl/crypto.h>
#include "des_locl.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);
}