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.
74 lines
1.5 KiB
74 lines
1.5 KiB
![]()
4 years ago
|
// 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
|