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1 | /* arcfour.h --- The arcfour stream cipher |
2 | * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 | |
3 | * Free Software Foundation, Inc. | |
4 | * | |
5 | * This file is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published | |
7 | * by the Free Software Foundation; either version 2, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | * This file is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this file; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA. | |
19 | * | |
20 | */ | |
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21 | /** @file lib/arcfour.h |
22 | * @brief Arcfour (RC4-compatible) stream cipher implementation | |
23 | */ | |
fcdff139 RK |
24 | |
25 | /* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */ | |
26 | ||
27 | #ifndef ARCFOUR_H | |
28 | # define ARCFOUR_H | |
29 | ||
30 | # include <stddef.h> | |
31 | # include <stdint.h> | |
32 | ||
33 | #define ARCFOUR_SBOX_SIZE 256 | |
34 | ||
4d82d579 | 35 | /** @brief Context structture for Arcfour stream cipher */ |
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36 | typedef struct |
37 | { | |
38 | char sbox[ARCFOUR_SBOX_SIZE]; | |
39 | uint8_t idx_i, idx_j; | |
40 | } arcfour_context; | |
41 | ||
42 | /* Apply ARCFOUR stream to INBUF placing the result in OUTBUF, both of | |
43 | LENGTH size. CONTEXT must be initialized with arcfour_setkey | |
44 | before this function is called. */ | |
45 | extern void | |
46 | arcfour_stream (arcfour_context * context, | |
47 | const char *inbuf, char *outbuf, size_t length); | |
48 | ||
49 | /* Initialize CONTEXT using encryption KEY of KEYLEN bytes. KEY | |
50 | should be 40 bits (5 bytes) or longer. The KEY cannot be zero | |
51 | length. */ | |
52 | extern void | |
53 | arcfour_setkey (arcfour_context * context, const char *key, size_t keylen); | |
54 | ||
55 | #endif /* ARCFOUR_H */ |