| /* 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; |
| |
| OPENSSL_port_memset(key, 0, 8); |
| length = OPENSSL_port_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; |
| |
| OPENSSL_port_memset(key1, 0, 8); |
| OPENSSL_port_memset(key2, 0, 8); |
| length = OPENSSL_port_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) |
| OPENSSL_port_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); |
| } |
