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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 #include <openssl/crypto.h>
61 
DES_string_to_key(const char * str,DES_cblock * key)62 void DES_string_to_key(const char *str, DES_cblock *key)
63 	{
64 	DES_key_schedule ks;
65 	int i,length;
66 	register 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 
DES_string_to_2keys(const char * str,DES_cblock * key1,DES_cblock * key2)102 void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
103 	{
104 	DES_key_schedule ks;
105 	int i,length;
106 	register 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 	}
175