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1/* $OpenBSD: str2key.c,v 1.14 2024/03/29 01:47:29 joshua 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_local.h"
61
62void
63DES_string_to_key(const char *str, DES_cblock *key)
64{
65 DES_key_schedule ks;
66 int i, length;
67 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 j = str[i];
77 if ((i % 16) < 8)
78 (*key)[i % 8] ^= (j << 1);
79 else {
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 explicit_bzero(&ks, sizeof(ks));
98 DES_set_odd_parity(key);
99}
100LCRYPTO_ALIAS(DES_string_to_key);
101
102void
103DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
104{
105 DES_key_schedule ks;
106 int i, length;
107 unsigned char j;
108
109 memset(key1, 0, 8);
110 memset(key2, 0, 8);
111 length = strlen(str);
112#ifdef OLD_STR_TO_KEY
113 if (length <= 8) {
114 for (i = 0; i < length; i++) {
115 (*key2)[i] = (*key1)[i] = (str[i] << 1);
116 }
117 } else {
118 for (i = 0; i < length; i++) {
119 if ((i/8) & 1)
120 (*key2)[i % 8] ^= (str[i] << 1);
121 else
122 (*key1)[i % 8] ^= (str[i] << 1);
123 }
124 }
125#else /* MIT COMPATIBLE */
126 for (i = 0; i < length; i++) {
127 j = str[i];
128 if ((i % 32) < 16) {
129 if ((i % 16) < 8)
130 (*key1)[i % 8] ^= (j << 1);
131 else
132 (*key2)[i % 8] ^= (j << 1);
133 } else {
134 j = ((j << 4) & 0xf0)|((j >> 4) & 0x0f);
135 j = ((j << 2) & 0xcc)|((j >> 2) & 0x33);
136 j = ((j << 1) & 0xaa)|((j >> 1) & 0x55);
137 if ((i % 16) < 8)
138 (*key1)[7 - (i % 8)] ^= j;
139 else
140 (*key2)[7 - (i % 8)] ^= j;
141 }
142 }
143 if (length <= 8)
144 memcpy(key2, key1, 8);
145#endif
146 DES_set_odd_parity(key1);
147 DES_set_odd_parity(key2);
148#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
149 if (DES_is_weak_key(key1))
150 (*key1)[7] ^= 0xF0;
151 DES_set_key(key1, &ks);
152#else
153 DES_set_key_unchecked(key1, &ks);
154#endif
155 DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
156#ifdef EXPERIMENTAL_STR_TO_STRONG_KEY
157 if (DES_is_weak_key(key2))
158 (*key2)[7] ^= 0xF0;
159 DES_set_key(key2, &ks);
160#else
161 DES_set_key_unchecked(key2, &ks);
162#endif
163 DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);
164 explicit_bzero(&ks, sizeof(ks));
165 DES_set_odd_parity(key1);
166 DES_set_odd_parity(key2);
167}
168LCRYPTO_ALIAS(DES_string_to_2keys);
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