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/*************************************************
* Turing Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#ifndef BOTAN_TURING_H__
#define BOTAN_TURING_H__
#include <botan/base.h>
namespace Botan {
/*************************************************
* Turing *
*************************************************/
class Turing : public StreamCipher
{
public:
void clear() throw();
std::string name() const { return "Turing"; }
StreamCipher* clone() const { return new Turing; }
Turing() : StreamCipher(4, 32, 4) { position = 0; }
private:
void cipher(const byte[], byte[], u32bit);
void key(const byte[], u32bit);
void resync(const byte[], u32bit);
void generate();
static u32bit fixedS(u32bit);
static void gen_sbox(MemoryRegion<u32bit>&, u32bit,
const MemoryRegion<u32bit>&);
static const u32bit Q_BOX[256];
static const byte SBOX[256], OFFSETS[272];
SecureBuffer<u32bit, 256> S0, S1, S2, S3;
SecureBuffer<u32bit, 17> R;
SecureVector<u32bit> K;
SecureBuffer<byte, 340> buffer;
u32bit position;
};
}
#endif
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