libssh: blf.h Source File

libssh 0.10.6 The SSH library

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blf.h
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#ifdef __cplusplus
53extern "C" {
54#endif
55
56/* Blowfish context */
57 typedef struct BlowfishContext {
58 uint32_t S[4][256]; /* S-Boxes */
59 uint32_t P[BLF_N + 2]; /* Subkeys */
60} ssh_blf_ctx;
61
62/* Raw access to customized Blowfish
63 * blf_key is just:
64 * Blowfish_initstate( state )
65 * Blowfish_expand0state( state, key, keylen )
66 */
67
68void Blowfish_encipher(ssh_blf_ctx *, uint32_t *, uint32_t *);
69void Blowfish_decipher(ssh_blf_ctx *, uint32_t *, uint32_t *);
70void Blowfish_initstate(ssh_blf_ctx *);
71void Blowfish_expand0state(ssh_blf_ctx *, const uint8_t *, uint16_t);
72void Blowfish_expandstate
73(ssh_blf_ctx *, const uint8_t *, uint16_t, const uint8_t *, uint16_t);
74
75/* Standard Blowfish */
76
77void ssh_blf_key(ssh_blf_ctx *, const uint8_t *, uint16_t);
78void ssh_blf_enc(ssh_blf_ctx *, uint32_t *, uint16_t);
79void ssh_blf_dec(ssh_blf_ctx *, uint32_t *, uint16_t);
80
81void ssh_blf_ecb_encrypt(ssh_blf_ctx *, uint8_t *, uint32_t);
82void ssh_blf_ecb_decrypt(ssh_blf_ctx *, uint8_t *, uint32_t);
83
84void ssh_blf_cbc_encrypt(ssh_blf_ctx *, uint8_t *, uint8_t *, uint32_t);
85void ssh_blf_cbc_decrypt(ssh_blf_ctx *, uint8_t *, uint8_t *, uint32_t);
86
87/* Converts uint8_t to uint32_t */
88uint32_t Blowfish_stream2word(const uint8_t *, uint16_t , uint16_t *);
89
90#endif /* !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) */
91
92#ifdef __cplusplus
93}
94#endif
95
96#endif /* _BLF_H */
BlowfishContext
Definition blf.h:57