1 /* $OpenBSD: blf.h,v 1.6 2007/02/21 19:25:40 grunk Exp $ */
2
3 /*
4 * Blowfish - a fast block cipher designed by Bruce Schneier
5 *
6 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Niels Provos.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #ifndef _BLF_H_
36 #define _BLF_H_
37
38 /* Schneier states the maximum key length to be 56 bytes.
39 * The way how the subkeys are initialized by the key up
40 * to (N+2)*4 i.e. 72 bytes are utilized.
41 * Warning: For normal blowfish encryption only 56 bytes
42 * of the key affect all cipherbits.
43 */
44
45 #define BLF_N 16 /* Number of Subkeys */
46 #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */
47 #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */
48
49 /* Blowfish context */
50 typedef struct BlowfishContext {
51 u_int32_t S[4][256]; /* S-Boxes */
52 u_int32_t P[BLF_N + 2]; /* Subkeys */
53 } blf_ctx;
54
55 /* Raw access to customized Blowfish
56 * blf_key is just:
57 * Blowfish_initstate( state )
58 * Blowfish_expand0state( state, key, keylen )
59 */
60
61 void Blowfish_encipher(blf_ctx *, u_int32_t *);
62 void Blowfish_decipher(blf_ctx *, u_int32_t *);
63 void Blowfish_initstate(blf_ctx *);
64 void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
65 void Blowfish_expandstate(blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
66
67 /* Standard Blowfish */
68
69 void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
70 void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
71 void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
72
73 /* Converts u_int8_t to u_int32_t */
74 u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t ,
75 u_int16_t *);
76
77 void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
78 void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
79
80 void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
81 void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
82 #endif