str2key.c revision 296465
1/* crypto/des/str2key.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include "des_locl.h" 60#include <openssl/crypto.h> 61 62void DES_string_to_key(const char *str, DES_cblock *key) 63{ 64 DES_key_schedule ks; 65 int i, length; 66 register unsigned char j; 67 68 memset(key, 0, 8); 69 length = strlen(str); 70#ifdef OLD_STR_TO_KEY 71 for (i = 0; i < length; i++) 72 (*key)[i % 8] ^= (str[i] << 1); 73#else /* MIT COMPATIBLE */ 74 for (i = 0; i < length; i++) { 75 j = str[i]; 76 if ((i % 16) < 8) 77 (*key)[i % 8] ^= (j << 1); 78 else { 79 /* Reverse the bit order 05/05/92 eay */ 80 j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); 81 j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); 82 j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); 83 (*key)[7 - (i % 8)] ^= j; 84 } 85 } 86#endif 87 DES_set_odd_parity(key); 88#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 89 if (DES_is_weak_key(key)) 90 (*key)[7] ^= 0xF0; 91 DES_set_key(key, &ks); 92#else 93 DES_set_key_unchecked(key, &ks); 94#endif 95 DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key); 96 OPENSSL_cleanse(&ks, sizeof(ks)); 97 DES_set_odd_parity(key); 98} 99 100void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) 101{ 102 DES_key_schedule ks; 103 int i, length; 104 register unsigned char j; 105 106 memset(key1, 0, 8); 107 memset(key2, 0, 8); 108 length = strlen(str); 109#ifdef OLD_STR_TO_KEY 110 if (length <= 8) { 111 for (i = 0; i < length; i++) { 112 (*key2)[i] = (*key1)[i] = (str[i] << 1); 113 } 114 } else { 115 for (i = 0; i < length; i++) { 116 if ((i / 8) & 1) 117 (*key2)[i % 8] ^= (str[i] << 1); 118 else 119 (*key1)[i % 8] ^= (str[i] << 1); 120 } 121 } 122#else /* MIT COMPATIBLE */ 123 for (i = 0; i < length; i++) { 124 j = str[i]; 125 if ((i % 32) < 16) { 126 if ((i % 16) < 8) 127 (*key1)[i % 8] ^= (j << 1); 128 else 129 (*key2)[i % 8] ^= (j << 1); 130 } else { 131 j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f); 132 j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33); 133 j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55); 134 if ((i % 16) < 8) 135 (*key1)[7 - (i % 8)] ^= j; 136 else 137 (*key2)[7 - (i % 8)] ^= j; 138 } 139 } 140 if (length <= 8) 141 memcpy(key2, key1, 8); 142#endif 143 DES_set_odd_parity(key1); 144 DES_set_odd_parity(key2); 145#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 146 if (DES_is_weak_key(key1)) 147 (*key1)[7] ^= 0xF0; 148 DES_set_key(key1, &ks); 149#else 150 DES_set_key_unchecked(key1, &ks); 151#endif 152 DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1); 153#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 154 if (DES_is_weak_key(key2)) 155 (*key2)[7] ^= 0xF0; 156 DES_set_key(key2, &ks); 157#else 158 DES_set_key_unchecked(key2, &ks); 159#endif 160 DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2); 161 OPENSSL_cleanse(&ks, sizeof(ks)); 162 DES_set_odd_parity(key1); 163 DES_set_odd_parity(key2); 164} 165