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1 /* crypto/des/str2key.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 |
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59 #include "des_locl.h" |
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60 #include <openssl/crypto.h> |
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61 |
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62 EXPORT_C void DES_string_to_key(const char *str, DES_cblock *key) |
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63 { |
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64 DES_key_schedule ks; |
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65 int i,length; |
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66 register unsigned char j; |
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67 |
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68 memset(key,0,8); |
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69 length=strlen(str); |
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70 #ifdef OLD_STR_TO_KEY |
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71 for (i=0; i<length; i++) |
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72 (*key)[i%8]^=(str[i]<<1); |
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73 #else /* MIT COMPATIBLE */ |
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74 for (i=0; i<length; i++) |
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75 { |
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76 j=str[i]; |
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77 if ((i%16) < 8) |
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78 (*key)[i%8]^=(j<<1); |
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79 else |
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80 { |
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81 /* Reverse the bit order 05/05/92 eay */ |
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82 j=((j<<4)&0xf0)|((j>>4)&0x0f); |
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83 j=((j<<2)&0xcc)|((j>>2)&0x33); |
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84 j=((j<<1)&0xaa)|((j>>1)&0x55); |
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85 (*key)[7-(i%8)]^=j; |
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86 } |
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87 } |
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88 #endif |
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89 DES_set_odd_parity(key); |
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90 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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91 if(DES_is_weak_key(key)) |
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92 (*key)[7] ^= 0xF0; |
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93 DES_set_key(key,&ks); |
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94 #else |
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95 DES_set_key_unchecked(key,&ks); |
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96 #endif |
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97 DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key); |
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98 OPENSSL_cleanse(&ks,sizeof(ks)); |
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99 DES_set_odd_parity(key); |
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100 } |
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101 |
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102 EXPORT_C void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2) |
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103 { |
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104 DES_key_schedule ks; |
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105 int i,length; |
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106 register unsigned char j; |
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107 |
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108 memset(key1,0,8); |
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109 memset(key2,0,8); |
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110 length=strlen(str); |
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111 #ifdef OLD_STR_TO_KEY |
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112 if (length <= 8) |
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113 { |
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114 for (i=0; i<length; i++) |
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115 { |
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116 (*key2)[i]=(*key1)[i]=(str[i]<<1); |
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117 } |
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118 } |
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119 else |
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120 { |
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121 for (i=0; i<length; i++) |
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122 { |
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123 if ((i/8)&1) |
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124 (*key2)[i%8]^=(str[i]<<1); |
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125 else |
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126 (*key1)[i%8]^=(str[i]<<1); |
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127 } |
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128 } |
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129 #else /* MIT COMPATIBLE */ |
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130 for (i=0; i<length; i++) |
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131 { |
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132 j=str[i]; |
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133 if ((i%32) < 16) |
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134 { |
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135 if ((i%16) < 8) |
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136 (*key1)[i%8]^=(j<<1); |
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137 else |
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138 (*key2)[i%8]^=(j<<1); |
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139 } |
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140 else |
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141 { |
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142 j=((j<<4)&0xf0)|((j>>4)&0x0f); |
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143 j=((j<<2)&0xcc)|((j>>2)&0x33); |
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144 j=((j<<1)&0xaa)|((j>>1)&0x55); |
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145 if ((i%16) < 8) |
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146 (*key1)[7-(i%8)]^=j; |
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147 else |
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148 (*key2)[7-(i%8)]^=j; |
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149 } |
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150 } |
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151 if (length <= 8) memcpy(key2,key1,8); |
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152 #endif |
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153 DES_set_odd_parity(key1); |
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154 DES_set_odd_parity(key2); |
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155 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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156 if(DES_is_weak_key(key1)) |
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157 (*key1)[7] ^= 0xF0; |
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158 DES_set_key(key1,&ks); |
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159 #else |
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160 DES_set_key_unchecked(key1,&ks); |
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161 #endif |
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162 DES_cbc_cksum((const unsigned char*)str,key1,length,&ks,key1); |
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163 #ifdef EXPERIMENTAL_STR_TO_STRONG_KEY |
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164 if(DES_is_weak_key(key2)) |
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165 (*key2)[7] ^= 0xF0; |
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166 DES_set_key(key2,&ks); |
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167 #else |
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168 DES_set_key_unchecked(key2,&ks); |
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169 #endif |
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170 DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2); |
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171 OPENSSL_cleanse(&ks,sizeof(ks)); |
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172 DES_set_odd_parity(key1); |
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173 DES_set_odd_parity(key2); |
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174 } |