str2key.c revision 109998
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 61void DES_string_to_key(const char *str, DES_cblock *key) 62 { 63 DES_key_schedule ks; 64 int i,length; 65 register unsigned char j; 66 67 memset(key,0,8); 68 length=strlen(str); 69#ifdef OLD_STR_TO_KEY 70 for (i=0; i<length; i++) 71 (*key)[i%8]^=(str[i]<<1); 72#else /* MIT COMPATIBLE */ 73 for (i=0; i<length; i++) 74 { 75 j=str[i]; 76 if ((i%16) < 8) 77 (*key)[i%8]^=(j<<1); 78 else 79 { 80 /* Reverse the bit order 05/05/92 eay */ 81 j=((j<<4)&0xf0)|((j>>4)&0x0f); 82 j=((j<<2)&0xcc)|((j>>2)&0x33); 83 j=((j<<1)&0xaa)|((j>>1)&0x55); 84 (*key)[7-(i%8)]^=j; 85 } 86 } 87#endif 88 DES_set_odd_parity(key); 89#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 90 if(DES_is_weak_key(key)) 91 (*key)[7] ^= 0xF0; 92 DES_set_key(key,&ks); 93#else 94 DES_set_key_unchecked(key,&ks); 95#endif 96 DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key); 97 OPENSSL_cleanse(&ks,sizeof(ks)); 98 DES_set_odd_parity(key); 99 } 100 101void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) 102 { 103 DES_key_schedule ks; 104 int i,length; 105 register unsigned char j; 106 107 memset(key1,0,8); 108 memset(key2,0,8); 109 length=strlen(str); 110#ifdef OLD_STR_TO_KEY 111 if (length <= 8) 112 { 113 for (i=0; i<length; i++) 114 { 115 (*key2)[i]=(*key1)[i]=(str[i]<<1); 116 } 117 } 118 else 119 { 120 for (i=0; i<length; i++) 121 { 122 if ((i/8)&1) 123 (*key2)[i%8]^=(str[i]<<1); 124 else 125 (*key1)[i%8]^=(str[i]<<1); 126 } 127 } 128#else /* MIT COMPATIBLE */ 129 for (i=0; i<length; i++) 130 { 131 j=str[i]; 132 if ((i%32) < 16) 133 { 134 if ((i%16) < 8) 135 (*key1)[i%8]^=(j<<1); 136 else 137 (*key2)[i%8]^=(j<<1); 138 } 139 else 140 { 141 j=((j<<4)&0xf0)|((j>>4)&0x0f); 142 j=((j<<2)&0xcc)|((j>>2)&0x33); 143 j=((j<<1)&0xaa)|((j>>1)&0x55); 144 if ((i%16) < 8) 145 (*key1)[7-(i%8)]^=j; 146 else 147 (*key2)[7-(i%8)]^=j; 148 } 149 } 150 if (length <= 8) memcpy(key2,key1,8); 151#endif 152 DES_set_odd_parity(key1); 153 DES_set_odd_parity(key2); 154#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 155 if(DES_is_weak_key(key1)) 156 (*key1)[7] ^= 0xF0; 157 DES_set_key(key1,&ks); 158#else 159 DES_set_key_unchecked(key1,&ks); 160#endif 161 DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1); 162#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY 163 if(DES_is_weak_key(key2)) 164 (*key2)[7] ^= 0xF0; 165 DES_set_key(key2,&ks); 166#else 167 DES_set_key_unchecked(key2,&ks); 168#endif 169 DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2); 170 OPENSSL_cleanse(&ks,sizeof(ks)); 171 DES_set_odd_parity(key1); 172 DES_set_odd_parity(key2); 173 } 174