mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
81b1a18063
We have made a fair number of changes, and we don't want WD to receive credit for issues he was not part of
74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
// gf2_32.h - originally written and placed in the public domain by Wei Dai
|
|
|
|
//! \file gf2_32.h
|
|
//! \brief Classes and functions for schemes over GF(2^32)
|
|
|
|
#ifndef CRYPTOPP_GF2_32_H
|
|
#define CRYPTOPP_GF2_32_H
|
|
|
|
#include "cryptlib.h"
|
|
#include "secblock.h"
|
|
#include "misc.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! \brief GF(2^32) with polynomial basis
|
|
class GF2_32
|
|
{
|
|
public:
|
|
typedef word32 Element;
|
|
typedef int RandomizationParameter;
|
|
|
|
GF2_32(word32 modulus=0x0000008D) : m_modulus(modulus) {}
|
|
|
|
Element RandomElement(RandomNumberGenerator &rng, int ignored = 0) const
|
|
{CRYPTOPP_UNUSED(ignored); return rng.GenerateWord32();}
|
|
|
|
bool Equal(Element a, Element b) const
|
|
{return a==b;}
|
|
|
|
Element Identity() 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
|
|
{CRYPTOPP_UNUSED(a); return 0;}
|
|
|
|
Element MultiplicativeIdentity() 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:
|
|
word32 m_modulus;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|