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
DES_string_to_key(const char * str,DES_cblock * key)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 #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
DES_string_to_2keys(const char * str,DES_cblock * key1,DES_cblock * key2)101 void 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