gf2_32.h

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// gf2_32.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_GF2_32_H
#define CRYPTOPP_GF2_32_H

#include "cryptlib.h"
#include "secblock.h"
#include "misc.h"

NAMESPACE_BEGIN(CryptoPP)

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