## File: gf256.h

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libcrypto++ 8.2.0-2
 `123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172` ``````// gf256.h - originally written and placed in the public domain by Wei Dai /// \file gf256.h /// \brief Classes and functions for schemes over GF(256) #ifndef CRYPTOPP_GF256_H #define CRYPTOPP_GF256_H #include "cryptlib.h" #include "misc.h" NAMESPACE_BEGIN(CryptoPP) /// \brief 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 {CRYPTOPP_UNUSED(ignored); 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 {CRYPTOPP_UNUSED(a); 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 ``````