You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.2 KiB
66 lines
1.2 KiB
#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
|