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/* crypto/des/str2key.c */
/* 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 <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;
register unsigned char j;
memset(key, 0, 8);
length = strlen(str);
#ifdef OLD_STR_TO_KEY
for (i = 0; i < length; i++)
(*key)[i % 8] ^= (str[i] << 1);
#else /* MIT COMPATIBLE */
for (i = 0; i < length; i++) {
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;
}
}
#endif
DES_set_odd_parity(key);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
if (DES_is_weak_key(key))
(*key)[7] ^= 0xF0;
DES_set_key(key, &ks);
#else
DES_set_key_unchecked(key, &ks);
#endif
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;
register unsigned char j;
memset(key1, 0, 8);
memset(key2, 0, 8);
length = strlen(str);
#ifdef OLD_STR_TO_KEY
if (length <= 8) {
for (i = 0; i < length; i++) {
(*key2)[i] = (*key1)[i] = (str[i] << 1);
}
} else {
for (i = 0; i < length; i++) {
if ((i / 8) & 1)
(*key2)[i % 8] ^= (str[i] << 1);
else
(*key1)[i % 8] ^= (str[i] << 1);
}
}
#else /* MIT COMPATIBLE */
for (i = 0; i < length; i++) {
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);
#endif
DES_set_odd_parity(key1);
DES_set_odd_parity(key2);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
if (DES_is_weak_key(key1))
(*key1)[7] ^= 0xF0;
DES_set_key(key1, &ks);
#else
DES_set_key_unchecked(key1, &ks);
#endif
DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
if (DES_is_weak_key(key2))
(*key2)[7] ^= 0xF0;
DES_set_key(key2, &ks);
#else
DES_set_key_unchecked(key2, &ks);
#endif
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);
}
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