1/*	$KAME: bf_skey.c,v 1.7 2002/02/27 01:33:59 itojun Exp $	*/
2
3/* crypto/bf/bf_skey.c */
4
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/cdefs.h>
63__FBSDID("$FreeBSD$");
64
65#include <sys/types.h>
66#include <sys/time.h>
67#include <sys/systm.h>
68#include <crypto/blowfish/blowfish.h>
69#include <crypto/blowfish/bf_locl.h>
70#include <crypto/blowfish/bf_pi.h>
71
72void
73BF_set_key(key, len, data)
74	BF_KEY *key;
75	int len;
76	unsigned char *data;
77{
78	int i;
79	BF_LONG *p, ri, in[2];
80	unsigned char *d, *end;
81
82	memcpy((char *)key, (const char *)&bf_init, sizeof(BF_KEY));
83	p = key->P;
84
85	if (len > ((BF_ROUNDS + 2) * 4))
86		len = (BF_ROUNDS + 2) * 4;
87
88	d = data;
89	end= &(data[len]);
90	for (i = 0; i < BF_ROUNDS + 2; i++) {
91		ri = *(d++);
92		if (d >= end) d = data;
93
94		ri <<= 8;
95		ri |= *(d++);
96		if (d >= end) d = data;
97
98		ri <<= 8;
99		ri |= *(d++);
100		if (d >= end) d = data;
101
102		ri <<= 8;
103		ri |= *(d++);
104		if (d >= end) d = data;
105
106		p[i] ^= ri;
107	}
108
109	in[0] = 0L;
110	in[1] = 0L;
111	for (i = 0; i < BF_ROUNDS + 2; i += 2) {
112		BF_encrypt(in, key);
113		p[i  ] = in[0];
114		p[i+1] = in[1];
115	}
116
117	p = key->S;
118	for (i = 0; i < 4 * 256; i += 2) {
119		BF_encrypt(in, key);
120		p[i  ] = in[0];
121		p[i+1] = in[1];
122	}
123}
124