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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
61OPENSSL_EXTERN int des_check_key;
62
63void des_string_to_key(const char *str, des_cblock *key)
64 {
65 des_key_schedule ks;
66 int i,length;
67 register unsigned char j;
68
69 memset(key,0,8);
70 length=strlen(str);
71#ifdef OLD_STR_TO_KEY
72 for (i=0; i<length; i++)
73 (*key)[i%8]^=(str[i]<<1);
74#else /* MIT COMPATIBLE */
75 for (i=0; i<length; i++)
76 {
77 j=str[i];
78 if ((i%16) < 8)
79 (*key)[i%8]^=(j<<1);
80 else
81 {
82 /* Reverse the bit order 05/05/92 eay */
83 j=((j<<4)&0xf0)|((j>>4)&0x0f);
84 j=((j<<2)&0xcc)|((j>>2)&0x33);
85 j=((j<<1)&0xaa)|((j>>1)&0x55);
86 (*key)[7-(i%8)]^=j;
87 }
88 }
89#endif
90 des_set_odd_parity(key);
91 i=des_check_key;
92 des_check_key=0;
93 des_set_key(key,ks);
94 des_check_key=i;
95 des_cbc_cksum((unsigned char*)str,key,length,ks,key);
96 memset(ks,0,sizeof(ks));
97 des_set_odd_parity(key);
98 }
99
100void des_string_to_2keys(const char *str, des_cblock *key1, des_cblock *key2)
101 {
102 des_key_schedule ks;
103 int i,length;
104 register unsigned char j;
105
106 memset(key1,0,8);
107 memset(key2,0,8);
108 length=strlen(str);
109#ifdef OLD_STR_TO_KEY
110 if (length <= 8)
111 {
112 for (i=0; i<length; i++)
113 {
114 (*key2)[i]=(*key1)[i]=(str[i]<<1);
115 }
116 }
117 else
118 {
119 for (i=0; i<length; i++)
120 {
121 if ((i/8)&1)
122 (*key2)[i%8]^=(str[i]<<1);
123 else
124 (*key1)[i%8]^=(str[i]<<1);
125 }
126 }
127#else /* MIT COMPATIBLE */
128 for (i=0; i<length; i++)
129 {
130 j=str[i];
131 if ((i%32) < 16)
132 {
133 if ((i%16) < 8)
134 (*key1)[i%8]^=(j<<1);
135 else
136 (*key2)[i%8]^=(j<<1);
137 }
138 else
139 {
140 j=((j<<4)&0xf0)|((j>>4)&0x0f);
141 j=((j<<2)&0xcc)|((j>>2)&0x33);
142 j=((j<<1)&0xaa)|((j>>1)&0x55);
143 if ((i%16) < 8)
144 (*key1)[7-(i%8)]^=j;
145 else
146 (*key2)[7-(i%8)]^=j;
147 }
148 }
149 if (length <= 8) memcpy(key2,key1,8);
150#endif
151 des_set_odd_parity(key1);
152 des_set_odd_parity(key2);
153 i=des_check_key;
154 des_check_key=0;
155 des_set_key(key1,ks);
156 des_cbc_cksum((unsigned char*)str,key1,length,ks,key1);
157 des_set_key(key2,ks);
158 des_cbc_cksum((unsigned char*)str,key2,length,ks,key2);
159 des_check_key=i;
160 memset(ks,0,sizeof(ks));
161 des_set_odd_parity(key1);
162 des_set_odd_parity(key2);
163 }
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