From a3b6ece7ab341b5b14135baeccea7d5e4c086771 Mon Sep 17 00:00:00 2001 From: weidai Date: Fri, 4 Oct 2002 17:31:41 +0000 Subject: Initial revision --- gf256.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 gf256.h (limited to 'gf256.h') diff --git a/gf256.h b/gf256.h new file mode 100644 index 00000000..e0ea7482 --- /dev/null +++ b/gf256.h @@ -0,0 +1,66 @@ +#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 -- cgit v1.2.1