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/*
* GOST 28147-89
* (C) 1999-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_GOST_28147_89_H__
#define BOTAN_GOST_28147_89_H__
#include <botan/block_cipher.h>
namespace Botan {
class GOST_28147_89_Params;
/**
* The GOST 28147-89 block cipher uses a set of 4 bit Sboxes, however
* the standard does not actually define these Sboxes; they are
* considered a local configuration issue. Several different sets are
* used.
*/
class GOST_28147_89_Params
{
public:
byte sbox_entry(u32bit row, u32bit col) const;
std::string param_name() const { return name; }
/**
* Default GOST parameters are the ones given in GOST R 34.11 for
* testing purposes; these sboxes are also used by Crypto++, and,
* at least according to Wikipedia, the Central Bank of Russian Federation
*/
GOST_28147_89_Params(const std::string& name = "R3411_94_TestParam");
private:
const byte* sboxes;
std::string name;
};
/**
* GOST 28147-89
*/
class BOTAN_DLL GOST_28147_89 : public BlockCipher
{
public:
void clear() throw() { EK.clear(); }
std::string name() const { return "GOST-28147-89"; }
BlockCipher* clone() const { return new GOST_28147_89(SBOX); }
GOST_28147_89(const GOST_28147_89_Params& params);
private:
GOST_28147_89(const SecureBuffer<u32bit, 1024>& other_SBOX) :
BlockCipher(8, 32), SBOX(other_SBOX) {}
void enc(const byte[], byte[]) const;
void dec(const byte[], byte[]) const;
void key_schedule(const byte[], u32bit);
SecureBuffer<u32bit, 1024> SBOX;
SecureBuffer<u32bit, 8> EK;
};
}
#endif
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