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164 lines
6.1 KiB
164 lines
6.1 KiB
/* crypto/des/str2key.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include <openssl/crypto.h> |
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#include "des_locl.h" |
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void DES_string_to_key(const char *str, DES_cblock *key) |
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{ |
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DES_key_schedule ks; |
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int i, length; |
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register unsigned char j; |
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memset(key, 0, 8); |
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length = strlen(str); |
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#ifdef OLD_STR_TO_KEY |
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for (i = 0; i < length; i++) |
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(*key)[i % 8] ^= (str[i] << 1); |
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#else /* MIT COMPATIBLE */ |
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for (i = 0; i < length; i++) { |
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j = str[i]; |
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if ((i % 16) < 8) |
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(*key)[i % 8] ^= (j << 1); |
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else { |
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/* Reverse the bit order 05/05/92 eay */ |
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j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); |
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j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); |
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j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); |
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(*key)[7 - (i % 8)] ^= j; |
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} |
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} |
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#endif |
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DES_set_odd_parity(key); |
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#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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if (DES_is_weak_key(key)) |
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(*key)[7] ^= 0xF0; |
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DES_set_key(key, &ks); |
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#else |
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DES_set_key_unchecked(key, &ks); |
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#endif |
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DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key); |
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OPENSSL_cleanse(&ks, sizeof(ks)); |
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DES_set_odd_parity(key); |
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} |
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void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) |
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{ |
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DES_key_schedule ks; |
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int i, length; |
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register unsigned char j; |
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memset(key1, 0, 8); |
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memset(key2, 0, 8); |
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length = strlen(str); |
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#ifdef OLD_STR_TO_KEY |
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if (length <= 8) { |
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for (i = 0; i < length; i++) { |
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(*key2)[i] = (*key1)[i] = (str[i] << 1); |
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} |
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} else { |
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for (i = 0; i < length; i++) { |
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if ((i / 8) & 1) |
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(*key2)[i % 8] ^= (str[i] << 1); |
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else |
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(*key1)[i % 8] ^= (str[i] << 1); |
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} |
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} |
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#else /* MIT COMPATIBLE */ |
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for (i = 0; i < length; i++) { |
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j = str[i]; |
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if ((i % 32) < 16) { |
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if ((i % 16) < 8) |
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(*key1)[i % 8] ^= (j << 1); |
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else |
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(*key2)[i % 8] ^= (j << 1); |
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} else { |
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j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); |
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j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); |
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j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); |
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if ((i % 16) < 8) |
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(*key1)[7 - (i % 8)] ^= j; |
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else |
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(*key2)[7 - (i % 8)] ^= j; |
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} |
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} |
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if (length <= 8) |
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memcpy(key2, key1, 8); |
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#endif |
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DES_set_odd_parity(key1); |
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DES_set_odd_parity(key2); |
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#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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if (DES_is_weak_key(key1)) |
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(*key1)[7] ^= 0xF0; |
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DES_set_key(key1, &ks); |
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#else |
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DES_set_key_unchecked(key1, &ks); |
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#endif |
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DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1); |
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#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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if (DES_is_weak_key(key2)) |
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(*key2)[7] ^= 0xF0; |
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DES_set_key(key2, &ks); |
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#else |
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DES_set_key_unchecked(key2, &ks); |
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#endif |
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DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2); |
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OPENSSL_cleanse(&ks, sizeof(ks)); |
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DES_set_odd_parity(key1); |
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DES_set_odd_parity(key2); |
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}
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