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annotate lib/arcfour.h @ 12421:e8d2c6fc33ad

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author Bruno Haible <bruno@clisp.org>
date Thu, 10 Dec 2009 20:28:30 +0100
parents 4e611c25a13f
children b5e42ef33b49
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1 /* arcfour.h --- The arcfour stream cipher
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2 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
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3 * Free Software Foundation, Inc.
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4 *
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5 * This file is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published
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7 * by the Free Software Foundation; either version 2, or (at your
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8 * option) any later version.
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9 *
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10 * This file is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this file; if not, write to the Free Software
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 * 02110-1301, USA.
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19 *
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20 */
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21
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22 /* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */
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23
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24 #ifndef ARCFOUR_H
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25 # define ARCFOUR_H
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26
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27 # include <stddef.h>
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28 # include <stdint.h>
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29
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30 #define ARCFOUR_SBOX_SIZE 256
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31
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32 typedef struct
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33 {
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34 char sbox[ARCFOUR_SBOX_SIZE];
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35 uint8_t idx_i, idx_j;
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36 } arcfour_context;
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37
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38 /* Apply ARCFOUR stream to INBUF placing the result in OUTBUF, both of
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39 LENGTH size. CONTEXT must be initialized with arcfour_setkey
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40 before this function is called. */
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41 extern void
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42 arcfour_stream (arcfour_context * context,
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43 const char *inbuf, char *outbuf, size_t length);
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44
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45 /* Initialize CONTEXT using encryption KEY of KEYLEN bytes. KEY
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46 should be 40 bits (5 bytes) or longer. The KEY cannot be zero
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47 length. */
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48 extern void
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49 arcfour_setkey (arcfour_context * context, const char *key, size_t keylen);
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50
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51 #endif /* ARCFOUR_H */