bf_skey.c revision 78064 
1/*	$FreeBSD: head/sys/crypto/blowfish/bf_skey.c 78064 2001-06-11 12:39:29Z ume $	*/
2/*	$KAME: bf_skey.c,v 1.5 2000/11/06 13:58:08 itojun Exp $	*/
3
4/* crypto/bf/bf_skey.c */
5/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
6 * All rights reserved.
7 *
8 * This package is an SSL implementation written
9 * by Eric Young (eay@mincom.oz.au).
10 * The implementation was written so as to conform with Netscapes SSL.
11 *
12 * This library is free for commercial and non-commercial use as long as
13 * the following conditions are aheared to.  The following conditions
14 * apply to all code found in this distribution, be it the RC4, RSA,
15 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
16 * included with this distribution is covered by the same copyright terms
17 * except that the holder is Tim Hudson (tjh@mincom.oz.au).
18 *
19 * Copyright remains Eric Young's, and as such any Copyright notices in
20 * the code are not to be removed.
21 * If this package is used in a product, Eric Young should be given attribution
22 * as the author of the parts of the library used.
23 * This can be in the form of a textual message at program startup or
24 * in documentation (online or textual) provided with the package.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the copyright
30 *    notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 *    notice, this list of conditions and the following disclaimer in the
33 *    documentation and/or other materials provided with the distribution.
34 * 3. All advertising materials mentioning features or use of this software
35 *    must display the following acknowledgement:
36 *    "This product includes cryptographic software written by
37 *     Eric Young (eay@mincom.oz.au)"
38 *    The word 'cryptographic' can be left out if the rouines from the library
39 *    being used are not cryptographic related :-).
40 * 4. If you include any Windows specific code (or a derivative thereof) from
41 *    the apps directory (application code) you must include an acknowledgement:
42 *    "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
43 *
44 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54 * SUCH DAMAGE.
55 *
56 * The licence and distribution terms for any publically available version or
57 * derivative of this code cannot be changed.  i.e. this code cannot simply be
58 * copied and put under another distribution licence
59 * [including the GNU Public Licence.]
60 */
61
62#include <sys/types.h>
63#include <sys/time.h>
64#include <sys/systm.h>
65#include <crypto/blowfish/blowfish.h>
66#include <crypto/blowfish/bf_locl.h>
67#include <crypto/blowfish/bf_pi.h>
68
69void
70BF_set_key(key, len, data)
71	BF_KEY *key;
72	int len;
73	unsigned char *data;
74{
75	int i;
76	BF_LONG *p, ri, in[2];
77	unsigned char *d, *end;
78
79	memcpy((char *)key, (char *)&bf_init, sizeof(BF_KEY));
80	p = key->P;
81
82	if (len > ((BF_ROUNDS + 2) * 4))
83		len = (BF_ROUNDS + 2) * 4;
84
85	d = data;
86	end= &(data[len]);
87	for (i = 0; i < BF_ROUNDS + 2; i++) {
88		ri = *(d++);
89		if (d >= end) d = data;
90
91		ri <<= 8;
92		ri |= *(d++);
93		if (d >= end) d = data;
94
95		ri <<= 8;
96		ri |= *(d++);
97		if (d >= end) d = data;
98
99		ri <<= 8;
100		ri |= *(d++);
101		if (d >= end) d = data;
102
103		p[i] ^= ri;
104	}
105
106	in[0] = 0L;
107	in[1] = 0L;
108	for (i = 0; i < BF_ROUNDS + 2; i += 2) {
109		BF_encrypt(in, key, BF_ENCRYPT);
110		p[i  ] = in[0];
111		p[i+1] = in[1];
112	}
113
114	p = key->S;
115	for (i = 0; i < 4 * 256; i += 2) {
116		BF_encrypt(in, key, BF_ENCRYPT);
117		p[i  ] = in[0];
118		p[i+1] = in[1];
119	}
120}
121