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/*
* GOST 28147-89
* (C) 1999-2009 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_GOST_28147_89_H_
#define BOTAN_GOST_28147_89_H_
#include <botan/block_cipher.h>
namespace Botan {
/**
* 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 final
{
public:
/**
* @param row the row
* @param col the column
* @return sbox entry at this row/column
*/
uint8_t sbox_entry(size_t row, size_t col) const;
/**
* @return name of this parameter set
*/
std::string param_name() const { return m_name; }
/**
* Return a representation used for building larger tables
* For internal use
*/
uint8_t sbox_pair(size_t row, size_t col) const;
/**
* 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
* @param name of the parameter set
*/
explicit GOST_28147_89_Params(const std::string& name = "R3411_94_TestParam");
private:
const uint8_t* m_sboxes;
std::string m_name;
};
/**
* GOST 28147-89
*/
class GOST_28147_89 final : public Block_Cipher_Fixed_Params<8, 32>
{
public:
void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
void clear() override;
std::string name() const override;
BlockCipher* clone() const override { return new GOST_28147_89(m_SBOX); }
/**
* @param params the sbox parameters to use
*/
explicit GOST_28147_89(const GOST_28147_89_Params& params);
explicit GOST_28147_89(const std::string& param_name) :
GOST_28147_89(GOST_28147_89_Params(param_name)) {}
private:
explicit GOST_28147_89(const std::vector<uint32_t>& other_SBOX) :
m_SBOX(other_SBOX), m_EK(8) {}
void key_schedule(const uint8_t[], size_t) override;
/*
* The sbox is not secret, this is just a larger expansion of it
* which we generate at runtime for faster execution
*/
std::vector<uint32_t> m_SBOX;
secure_vector<uint32_t> m_EK;
};
}
#endif
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