Annotation of src/include/blf.h, Revision 1.5
1.5 ! aaron 1: /* $OpenBSD: blf.h,v 1.4 1998/08/10 18:40:53 provos Exp $ */
1.1 provos 2: /*
3: * Blowfish - a fast block cipher designed by Bruce Schneier
4: *
5: * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
1.2 provos 6: * All rights reserved.
1.1 provos 7: *
1.2 provos 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:
1.3 provos 18: * This product includes software developed by Niels Provos.
1.2 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.
1.1 provos 32: */
33:
34: #ifndef _BLF_H_
35: #define _BLF_H_
36:
1.5 ! aaron 37: /* Schneier specifies a maximum key length of 56 bytes.
! 38: * This ensures that every key bit affects every cipher
! 39: * bit. However, the subkeys can hold up to 72 bytes.
1.1 provos 40: * Warning: For normal blowfish encryption only 56 bytes
41: * of the key affect all cipherbits.
42: */
43:
44: #define BLF_N 16 /* Number of Subkeys */
45: #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */
46:
47: /* Blowfish context */
48: typedef struct BlowfishContext {
49: u_int32_t S[4][256]; /* S-Boxes */
50: u_int32_t P[BLF_N + 2]; /* Subkeys */
51: } blf_ctx;
52:
53: /* Raw access to customized Blowfish
54: * blf_key is just:
55: * Blowfish_initstate( state )
56: * Blowfish_expand0state( state, key, keylen )
57: */
58:
59: void Blowfish_encipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
60: void Blowfish_decipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
61: void Blowfish_initstate __P((blf_ctx *));
1.3 provos 62: void Blowfish_expand0state __P((blf_ctx *, const u_int8_t *, u_int16_t));
63: void Blowfish_expandstate
64: __P((blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t));
1.1 provos 65:
66: /* Standard Blowfish */
67:
1.3 provos 68: void blf_key __P((blf_ctx *, const u_int8_t *, u_int16_t));
1.1 provos 69: void blf_enc __P((blf_ctx *, u_int32_t *, u_int16_t));
70: void blf_dec __P((blf_ctx *, u_int32_t *, u_int16_t));
1.4 provos 71:
72: void blf_ecb_encrypt __P((blf_ctx *, u_int8_t *, u_int32_t));
73: void blf_ecb_decrypt __P((blf_ctx *, u_int8_t *, u_int32_t));
74:
75: void blf_cbc_encrypt __P((blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t));
76: void blf_cbc_decrypt __P((blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t));
1.1 provos 77:
78: /* Converts u_int8_t to u_int32_t */
1.3 provos 79: u_int32_t Blowfish_stream2word __P((const u_int8_t *, u_int16_t , u_int16_t *));
1.1 provos 80:
81: #endif