1 /* crypto/des/str2key.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@mincom.oz.au).
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@mincom.oz.au).
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@mincom.oz.au)"
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@mincom.oz.au)"
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 extern int des_check_key;
62
des_string_to_key(str,key)63 void des_string_to_key(str, key)
64 char *str;
65 des_cblock (*key);
66 {
67 des_key_schedule ks;
68 int i,length;
69 register unsigned char j;
70
71 memset(key,0,8);
72 length=strlen(str);
73 #ifdef OLD_STR_TO_KEY
74 for (i=0; i<length; i++)
75 (*key)[i%8]^=(str[i]<<1);
76 #else /* MIT COMPATIBLE */
77 for (i=0; i<length; i++)
78 {
79 j=str[i];
80 if ((i%16) < 8)
81 (*key)[i%8]^=(j<<1);
82 else
83 {
84 /* Reverse the bit order 05/05/92 eay */
85 j=((j<<4)&0xf0)|((j>>4)&0x0f);
86 j=((j<<2)&0xcc)|((j>>2)&0x33);
87 j=((j<<1)&0xaa)|((j>>1)&0x55);
88 (*key)[7-(i%8)]^=j;
89 }
90 }
91 #endif
92 des_set_odd_parity((des_cblock *)key);
93 i=des_check_key;
94 des_check_key=0;
95 des_set_key((des_cblock *)key,ks);
96 des_check_key=i;
97 des_cbc_cksum((des_cblock *)str,(des_cblock *)key,(long)length,ks,
98 (des_cblock *)key);
99 memset(ks,0,sizeof(ks));
100 des_set_odd_parity((des_cblock *)key);
101 }
102
des_string_to_2keys(str,key1,key2)103 void des_string_to_2keys(str, key1, key2)
104 char *str;
105 des_cblock (*key1);
106 des_cblock (*key2);
107 {
108 des_key_schedule ks;
109 int i,length;
110 register unsigned char j;
111
112 memset(key1,0,8);
113 memset(key2,0,8);
114 length=strlen(str);
115 #ifdef OLD_STR_TO_KEY
116 if (length <= 8)
117 {
118 for (i=0; i<length; i++)
119 {
120 (*key2)[i]=(*key1)[i]=(str[i]<<1);
121 }
122 }
123 else
124 {
125 for (i=0; i<length; i++)
126 {
127 if ((i/8)&1)
128 (*key2)[i%8]^=(str[i]<<1);
129 else
130 (*key1)[i%8]^=(str[i]<<1);
131 }
132 }
133 #else /* MIT COMPATIBLE */
134 for (i=0; i<length; i++)
135 {
136 j=str[i];
137 if ((i%32) < 16)
138 {
139 if ((i%16) < 8)
140 (*key1)[i%8]^=(j<<1);
141 else
142 (*key2)[i%8]^=(j<<1);
143 }
144 else
145 {
146 j=((j<<4)&0xf0)|((j>>4)&0x0f);
147 j=((j<<2)&0xcc)|((j>>2)&0x33);
148 j=((j<<1)&0xaa)|((j>>1)&0x55);
149 if ((i%16) < 8)
150 (*key1)[7-(i%8)]^=j;
151 else
152 (*key2)[7-(i%8)]^=j;
153 }
154 }
155 if (length <= 8) memcpy(key2,key1,8);
156 #endif
157 des_set_odd_parity((des_cblock *)key1);
158 des_set_odd_parity((des_cblock *)key2);
159 i=des_check_key;
160 des_check_key=0;
161 des_set_key((des_cblock *)key1,ks);
162 des_cbc_cksum((des_cblock *)str,(des_cblock *)key1,(long)length,ks,
163 (des_cblock *)key1);
164 des_set_key((des_cblock *)key2,ks);
165 des_cbc_cksum((des_cblock *)str,(des_cblock *)key2,(long)length,ks,
166 (des_cblock *)key2);
167 des_check_key=i;
168 memset(ks,0,sizeof(ks));
169 des_set_odd_parity(key1);
170 des_set_odd_parity(key2);
171 }
172