1/* $OpenBSD: blf.h,v 1.8 2021/11/29 01:04:45 djm 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. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef _BLF_H_
32#define _BLF_H_
33
34/* Schneier specifies a maximum key length of 56 bytes.
35 * This ensures that every key bit affects every cipher
36 * bit.  However, the subkeys can hold up to 72 bytes.
37 * Warning: For normal blowfish encryption only 56 bytes
38 * of the key affect all cipherbits.
39 */
40
41#define BLF_N	16			/* Number of Subkeys */
42#define BLF_MAXKEYLEN ((BLF_N-2)*4)	/* 448 bits */
43#define BLF_MAXUTILIZED ((BLF_N+2)*4)	/* 576 bits */
44
45/* Blowfish context */
46typedef struct BlowfishContext {
47	u_int32_t S[4][256];	/* S-Boxes */
48	u_int32_t P[BLF_N + 2];	/* Subkeys */
49} blf_ctx;
50
51/* Raw access to customized Blowfish
52 *	blf_key is just:
53 *	Blowfish_initstate( state )
54 *	Blowfish_expand0state( state, key, keylen )
55 */
56
57void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *);
58void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
59void Blowfish_initstate(blf_ctx *);
60void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
61void Blowfish_expandstate
62(blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
63
64/* Standard Blowfish */
65
66void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
67void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
68void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
69
70void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
71void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
72
73void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
74void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
75
76/* Converts u_int8_t to u_int32_t */
77u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *);
78
79#endif
80