1 /* crypto/des/str2key.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 extern int des_check_key;
63 void des_string_to_key(str, key)
69 register unsigned char j;
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++)
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);
92 des_set_odd_parity((des_cblock *)key);
95 if(des_is_weak_key((des_cblock *)key))
97 des_set_key((des_cblock *)key,ks);
99 des_cbc_cksum((des_cblock *)str,(des_cblock *)key,(long)length,ks,
101 memset(ks,0,sizeof(ks));
102 des_set_odd_parity((des_cblock *)key);
105 void des_string_to_2keys(str, key1, key2)
112 register unsigned char j;
117 #ifdef OLD_STR_TO_KEY
120 for (i=0; i<length; i++)
122 (*key2)[i]=(*key1)[i]=(str[i]<<1);
127 for (i=0; i<length; i++)
130 (*key2)[i%8]^=(str[i]<<1);
132 (*key1)[i%8]^=(str[i]<<1);
135 #else /* MIT COMPATIBLE */
136 for (i=0; i<length; i++)
142 (*key1)[i%8]^=(j<<1);
144 (*key2)[i%8]^=(j<<1);
148 j=((j<<4)&0xf0)|((j>>4)&0x0f);
149 j=((j<<2)&0xcc)|((j>>2)&0x33);
150 j=((j<<1)&0xaa)|((j>>1)&0x55);
157 if (length <= 8) memcpy(key2,key1,8);
159 des_set_odd_parity((des_cblock *)key1);
160 des_set_odd_parity((des_cblock *)key2);
163 if(des_is_weak_key((des_cblock *)key1))
165 des_set_key((des_cblock *)key1,ks);
166 des_cbc_cksum((des_cblock *)str,(des_cblock *)key1,(long)length,ks,
168 if(des_is_weak_key((des_cblock *)key2))
170 des_set_key((des_cblock *)key2,ks);
171 des_cbc_cksum((des_cblock *)str,(des_cblock *)key2,(long)length,ks,
174 memset(ks,0,sizeof(ks));
175 des_set_odd_parity(key1);
176 des_set_odd_parity(key2);