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-rw-r--r--CryptoPP/gf256.h66
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diff --git a/CryptoPP/gf256.h b/CryptoPP/gf256.h
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+#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