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| author | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
|---|---|---|
| committer | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
| commit | a3b6ece7ab341b5b14135baeccea7d5e4c086771 (patch) | |
| tree | 8b045309c238226c32a563b1df6b9c30a2f0e0b3 /gf256.h | |
| download | cryptopp-git-a3b6ece7ab341b5b14135baeccea7d5e4c086771.tar.gz | |
Initial revision
Diffstat (limited to 'gf256.h')
| -rw-r--r-- | gf256.h | 66 |
1 files changed, 66 insertions, 0 deletions
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 |