gf256.h
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#ifndef CRYPTOPP_GF256_H
#define CRYPTOPP_GF256_H
#include "cryptlib.h"
NAMESPACE_BEGIN(CryptoPP)
//! GF(256) with polynomial basis
class GF256
{
public:
typedef byte Element;
typedef int RandomizationParameter;
GF256(byte modulus) : m_modulus(modulus) {}
Element RandomElement(RandomNumberGenerator &rng, int ignored = 0) const
{return rng.GenerateByte();}
bool Equal(Element a, Element b) const
{return a==b;}
Element Zero() const
{return 0;}
Element Add(Element a, Element b) const
{return a^b;}
Element& Accumulate(Element &a, Element b) const
{return a^=b;}
Element Inverse(Element a) const
{return a;}
Element Subtract(Element a, Element b) const
{return a^b;}
Element& Reduce(Element &a, Element b) const
{return a^=b;}
Element Double(Element a) const
{return 0;}
Element One() const
{return 1;}
Element Multiply(Element a, Element b) const;
Element Square(Element a) const
{return Multiply(a, a);}
bool IsUnit(Element a) const
{return a != 0;}
Element MultiplicativeInverse(Element a) const;
Element Divide(Element a, Element b) const
{return Multiply(a, MultiplicativeInverse(b));}
private:
word m_modulus;
};
NAMESPACE_END
#endif