rc4.c File Reference

RC4 stream cipher. More...

#include "includes.h"
#include "common.h"
#include "crypto.h"

Defines
#define	S_SWAP(a, b)   do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
Functions
int	rc4_skip (const u8 *key, size_t keylen, size_t skip, u8 *data, size_t data_len)
	XOR RC4 stream to given data with skip-stream-start.

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Detailed Description

RC4 stream cipher.

Copyright

Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

Alternatively, this software may be distributed under the terms of BSD license.

See README and COPYING for more details.

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Function Documentation

int rc4_skip	(	const u8 *	key,
		size_t	keylen,
		size_t	skip,
		u8 *	data,
		size_t	data_len
	)

XOR RC4 stream to given data with skip-stream-start.

Parameters:

	key	RC4 key
	keylen	RC4 key length
	skip	number of bytes to skip from the beginning of the RC4 stream
	data	data to be XOR'ed with RC4 stream
	data_len	buf length

Returns:

0 on success, -1 on failure

Generate RC4 pseudo random stream for the given key, skip beginning of the stream, and XOR the end result with the data buffer to perform RC4 encryption/decryption.