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/*
* Turing
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_TURING_H__
#define BOTAN_TURING_H__
#include <botan/stream_cipher.h>
namespace Botan {
/**
* Turing
*/
class BOTAN_DLL Turing : public StreamCipher
{
public:
void cipher(const byte in[], byte out[], u32bit length);
void set_iv(const byte iv[], u32bit iv_length);
bool valid_iv_length(u32bit iv_len) const
{ return (iv_len % 4 == 0 && iv_len <= 16); }
void clear();
std::string name() const { return "Turing"; }
StreamCipher* clone() const { return new Turing; }
Turing() : StreamCipher(4, 32, 4) { position = 0; }
private:
void key_schedule(const byte[], u32bit);
void generate();
static u32bit fixedS(u32bit);
static const u32bit Q_BOX[256];
static const byte SBOX[256];
SecureVector<u32bit, 256> S0, S1, S2, S3;
SecureVector<u32bit, 17> R;
SecureVector<u32bit> K;
SecureVector<byte, 340> buffer;
u32bit position;
};
}
#endif
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