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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[], size_t length);
void set_iv(const byte iv[], size_t iv_length);
bool valid_iv_length(size_t iv_len) const
{ return (iv_len % 4 == 0 && iv_len <= 16); }
Key_Length_Specification key_spec() const
{
return Key_Length_Specification(4, 32, 4);
}
void clear();
std::string name() const { return "Turing"; }
StreamCipher* clone() const { return new Turing; }
Turing() : S0(256), S1(256), S2(256), S3(256),
R(17), buffer(340), position(0) {}
private:
void key_schedule(const byte[], size_t);
void generate();
static u32bit fixedS(u32bit);
static const u32bit Q_BOX[256];
static const byte SBOX[256];
secure_vector<u32bit> S0, S1, S2, S3;
secure_vector<u32bit> R;
secure_vector<u32bit> K;
secure_vector<byte> buffer;
size_t position;
};
}
#endif
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