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1/* $OpenBSD: str2key.c,v 1.9 2014/10/28 07:35:58 jsg Exp $ */
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 <openssl/crypto.h>
60#include "des_locl.h"
61
62void DES_string_to_key(const char *str, DES_cblock *key)
63 {
64 DES_key_schedule ks;
65 int i,length;
66 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
102void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
103 {
104 DES_key_schedule ks;
105 int i,length;
106 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 }
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