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/*
* Twofish
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_TWOFISH_H__
#define BOTAN_TWOFISH_H__
#include <botan/block_cipher.h>
namespace Botan {
/**
* Twofish, an AES finalist
*/
class BOTAN_DLL Twofish : public BlockCipher
{
public:
void encrypt_n(const byte in[], byte out[], u32bit blocks) const;
void decrypt_n(const byte in[], byte out[], u32bit blocks) const;
void clear();
std::string name() const { return "Twofish"; }
BlockCipher* clone() const { return new Twofish; }
Twofish() : BlockCipher(16, 16, 32, 8), SB(1024), RK(40) {}
private:
void key_schedule(const byte[], u32bit);
static void rs_mul(byte[4], byte, u32bit);
static const u32bit MDS0[256];
static const u32bit MDS1[256];
static const u32bit MDS2[256];
static const u32bit MDS3[256];
static const byte Q0[256];
static const byte Q1[256];
static const byte RS[32];
static const byte EXP_TO_POLY[255];
static const byte POLY_TO_EXP[255];
SecureVector<u32bit> SB, RK;
};
}
#endif
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