libssh: blf.h Source File

libssh 0.9.6 The SSH library

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 /* Blowfish context */
53 typedef struct BlowfishContext {
54 uint32_t S[4][256]; /* S-Boxes */
55 uint32_t P[BLF_N + 2]; /* Subkeys */
56 } ssh_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
64 void Blowfish_encipher(ssh_blf_ctx *, uint32_t *, uint32_t *);
65 void Blowfish_decipher(ssh_blf_ctx *, uint32_t *, uint32_t *);
66 void Blowfish_initstate(ssh_blf_ctx *);
67 void Blowfish_expand0state(ssh_blf_ctx *, const uint8_t *, uint16_t);
68 void Blowfish_expandstate
69 (ssh_blf_ctx *, const uint8_t *, uint16_t, const uint8_t *, uint16_t);
70
71 /* Standard Blowfish */
72
73 void ssh_blf_key(ssh_blf_ctx *, const uint8_t *, uint16_t);
74 void ssh_blf_enc(ssh_blf_ctx *, uint32_t *, uint16_t);
75 void ssh_blf_dec(ssh_blf_ctx *, uint32_t *, uint16_t);
76
77 void ssh_blf_ecb_encrypt(ssh_blf_ctx *, uint8_t *, uint32_t);
78 void ssh_blf_ecb_decrypt(ssh_blf_ctx *, uint8_t *, uint32_t);
79
80 void ssh_blf_cbc_encrypt(ssh_blf_ctx *, uint8_t *, uint8_t *, uint32_t);
81 void ssh_blf_cbc_decrypt(ssh_blf_ctx *, uint8_t *, uint8_t *, uint32_t);
82
83 /* Converts uint8_t to uint32_t */
84 uint32_t Blowfish_stream2word(const uint8_t *, uint16_t , uint16_t *);
85
86 #endif /* !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) */
87 #endif /* _BLF_H */
BlowfishContext
Definition: blf.h:53