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 61 void 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 des_set_key_unchecked(key,ks); 90 des_cbc_cksum((const unsigned char*)str,key,length,ks,key); 91 OPENSSL_cleanse(ks,sizeof(ks)); 92 des_set_odd_parity(key); 93 } 94 95 void des_string_to_2keys(const char *str, des_cblock *key1, des_cblock *key2) 96 { 97 des_key_schedule ks; 98 int i,length; 99 register unsigned char j; 100 101 memset(key1,0,8); 102 memset(key2,0,8); 103 length=strlen(str); 104 #ifdef OLD_STR_TO_KEY 105 if (length <= 8) 106 { 107 for (i=0; i<length; i++) 108 { 109 (*key2)[i]=(*key1)[i]=(str[i]<<1); 110 } 111 } 112 else 113 { 114 for (i=0; i<length; i++) 115 { 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 { 125 j=str[i]; 126 if ((i%32) < 16) 127 { 128 if ((i%16) < 8) 129 (*key1)[i%8]^=(j<<1); 130 else 131 (*key2)[i%8]^=(j<<1); 132 } 133 else 134 { 135 j=((j<<4)&0xf0)|((j>>4)&0x0f); 136 j=((j<<2)&0xcc)|((j>>2)&0x33); 137 j=((j<<1)&0xaa)|((j>>1)&0x55); 138 if ((i%16) < 8) 139 (*key1)[7-(i%8)]^=j; 140 else 141 (*key2)[7-(i%8)]^=j; 142 } 143 } 144 if (length <= 8) memcpy(key2,key1,8); 145 #endif 146 des_set_odd_parity(key1); 147 des_set_odd_parity(key2); 148 des_set_key_unchecked(key1,ks); 149 des_cbc_cksum((const unsigned char*)str,key1,length,ks,key1); 150 des_set_key_unchecked(key2,ks); 151 des_cbc_cksum((const unsigned char*)str,key2,length,ks,key2); 152 OPENSSL_cleanse(ks,sizeof(ks)); 153 des_set_odd_parity(key1); 154 des_set_odd_parity(key2); 155 } 156