Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
| 62 | void 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 | { |
| 76 | j=str[i]; |
| 77 | if ((i%16) < 8) |
| 78 | (*key)[i%8]^=(j<<1); |
| 79 | else |
| 80 | { |
| 81 | /* Reverse the bit order 05/05/92 eay */ |
| 82 | j=((j<<4)&0xf0)|((j>>4)&0x0f); |
| 83 | j=((j<<2)&0xcc)|((j>>2)&0x33); |
| 84 | j=((j<<1)&0xaa)|((j>>1)&0x55); |
| 85 | (*key)[7-(i%8)]^=j; |
| 86 | } |
| 87 | } |
| 88 | #endif |
| 89 | DES_set_odd_parity(key); |
| 90 | #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
| 91 | if(DES_is_weak_key(key)) |
| 92 | (*key)[7] ^= 0xF0; |
| 93 | DES_set_key(key,&ks); |
| 94 | #else |
| 95 | DES_set_key_unchecked(key,&ks); |
| 96 | #endif |
| 97 | DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key); |
| 98 | OPENSSL_cleanse(&ks,sizeof(ks)); |
| 99 | DES_set_odd_parity(key); |
| 100 | } |
| 101 | |
| 102 | void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) |
| 103 | { |
| 104 | DES_key_schedule ks; |
| 105 | int i,length; |
| 106 | register unsigned char j; |
| 107 | |
| 108 | memset(key1,0,8); |
| 109 | memset(key2,0,8); |
| 110 | length=strlen(str); |
| 111 | #ifdef OLD_STR_TO_KEY |
| 112 | if (length <= 8) |
| 113 | { |
| 114 | for (i=0; i<length; i++) |
| 115 | { |
| 116 | (*key2)[i]=(*key1)[i]=(str[i]<<1); |
| 117 | } |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | for (i=0; i<length; i++) |
| 122 | { |
| 123 | if ((i/8)&1) |
| 124 | (*key2)[i%8]^=(str[i]<<1); |
| 125 | else |
| 126 | (*key1)[i%8]^=(str[i]<<1); |
| 127 | } |
| 128 | } |
| 129 | #else /* MIT COMPATIBLE */ |
| 130 | for (i=0; i<length; i++) |
| 131 | { |
| 132 | j=str[i]; |
| 133 | if ((i%32) < 16) |
| 134 | { |
| 135 | if ((i%16) < 8) |
| 136 | (*key1)[i%8]^=(j<<1); |
| 137 | else |
| 138 | (*key2)[i%8]^=(j<<1); |
| 139 | } |
| 140 | else |
| 141 | { |
| 142 | j=((j<<4)&0xf0)|((j>>4)&0x0f); |
| 143 | j=((j<<2)&0xcc)|((j>>2)&0x33); |
| 144 | j=((j<<1)&0xaa)|((j>>1)&0x55); |
| 145 | if ((i%16) < 8) |
| 146 | (*key1)[7-(i%8)]^=j; |
| 147 | else |
| 148 | (*key2)[7-(i%8)]^=j; |
| 149 | } |
| 150 | } |
| 151 | if (length <= 8) memcpy(key2,key1,8); |
| 152 | #endif |
| 153 | DES_set_odd_parity(key1); |
| 154 | DES_set_odd_parity(key2); |
| 155 | #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
| 156 | if(DES_is_weak_key(key1)) |
| 157 | (*key1)[7] ^= 0xF0; |
| 158 | DES_set_key(key1,&ks); |
| 159 | #else |
| 160 | DES_set_key_unchecked(key1,&ks); |
| 161 | #endif |
| 162 | DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1); |
| 163 | #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
| 164 | if(DES_is_weak_key(key2)) |
| 165 | (*key2)[7] ^= 0xF0; |
| 166 | DES_set_key(key2,&ks); |
| 167 | #else |
| 168 | DES_set_key_unchecked(key2,&ks); |
| 169 | #endif |
| 170 | DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2); |
| 171 | OPENSSL_cleanse(&ks,sizeof(ks)); |
| 172 | DES_set_odd_parity(key1); |
| 173 | DES_set_odd_parity(key2); |
| 174 | } |