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/*
* ARC4
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ARC4_H__
#define BOTAN_ARC4_H__
#include <botan/stream_cipher.h>
#include <botan/types.h>
namespace Botan {
/**
* Alleged RC4
*/
class BOTAN_DLL ARC4 : public StreamCipher
{
public:
void cipher(const byte in[], byte out[], u32bit length);
void clear();
std::string name() const;
StreamCipher* clone() const { return new ARC4(SKIP); }
/**
* @param skip skip this many initial bytes in the keystream
*/
ARC4(u32bit skip = 0);
~ARC4() { clear(); }
private:
void key_schedule(const byte[], u32bit);
void generate();
const u32bit SKIP;
SecureVector<byte, DEFAULT_BUFFERSIZE> buffer;
SecureVector<u32bit, 256> state;
u32bit X, Y, position;
};
}
#endif
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