blf.h revision 262566 
1/* $OpenBSD: blf.h,v 1.7 2007/03/14 17:59:41 grunk Exp $ */
2/*
3 * Blowfish - a fast block cipher designed by Bruce Schneier
4 *
5 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *      This product includes software developed by Niels Provos.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef _BLF_H_
35#define _BLF_H_
36
37#include "includes.h"
38
39#if !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H)
40
41/* Schneier specifies a maximum key length of 56 bytes.
42 * This ensures that every key bit affects every cipher
43 * bit.  However, the subkeys can hold up to 72 bytes.
44 * Warning: For normal blowfish encryption only 56 bytes
45 * of the key affect all cipherbits.
46 */
47
48#define BLF_N	16			/* Number of Subkeys */
49#define BLF_MAXKEYLEN ((BLF_N-2)*4)	/* 448 bits */
50#define BLF_MAXUTILIZED ((BLF_N+2)*4)	/* 576 bits */
51
52/* Blowfish context */
53typedef struct BlowfishContext {
54	u_int32_t S[4][256];	/* S-Boxes */
55	u_int32_t P[BLF_N + 2];	/* Subkeys */
56} blf_ctx;
57
58/* Raw access to customized Blowfish
59 *	blf_key is just:
60 *	Blowfish_initstate( state )
61 *	Blowfish_expand0state( state, key, keylen )
62 */
63
64void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *);
65void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
66void Blowfish_initstate(blf_ctx *);
67void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
68void Blowfish_expandstate
69(blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
70
71/* Standard Blowfish */
72
73void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
74void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
75void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
76
77void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
78void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
79
80void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
81void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
82
83/* Converts u_int8_t to u_int32_t */
84u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *);
85
86#endif /* !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) */
87#endif /* _BLF_H */
88
89