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73 lines
1.5 KiB
73 lines
1.5 KiB
// gf2_32.h - originally written and placed in the public domain by Wei Dai |
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/// \file gf2_32.h |
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/// \brief Classes and functions for schemes over GF(2^32) |
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#ifndef CRYPTOPP_GF2_32_H |
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#define CRYPTOPP_GF2_32_H |
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#include "cryptlib.h" |
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#include "secblock.h" |
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#include "misc.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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/// \brief GF(2^32) with polynomial basis |
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class GF2_32 |
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{ |
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public: |
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typedef word32 Element; |
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typedef int RandomizationParameter; |
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GF2_32(word32 modulus=0x0000008D) : m_modulus(modulus) {} |
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Element RandomElement(RandomNumberGenerator &rng, int ignored = 0) const |
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{CRYPTOPP_UNUSED(ignored); return rng.GenerateWord32();} |
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bool Equal(Element a, Element b) const |
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{return a==b;} |
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Element Identity() const |
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{return 0;} |
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Element Add(Element a, Element b) const |
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{return a^b;} |
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Element& Accumulate(Element &a, Element b) const |
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{return a^=b;} |
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Element Inverse(Element a) const |
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{return a;} |
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Element Subtract(Element a, Element b) const |
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{return a^b;} |
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Element& Reduce(Element &a, Element b) const |
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{return a^=b;} |
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Element Double(Element a) const |
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{CRYPTOPP_UNUSED(a); return 0;} |
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Element MultiplicativeIdentity() const |
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{return 1;} |
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Element Multiply(Element a, Element b) const; |
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Element Square(Element a) const |
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{return Multiply(a, a);} |
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bool IsUnit(Element a) const |
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{return a != 0;} |
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Element MultiplicativeInverse(Element a) const; |
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Element Divide(Element a, Element b) const |
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{return Multiply(a, MultiplicativeInverse(b));} |
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private: |
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word32 m_modulus; |
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}; |
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NAMESPACE_END |
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#endif
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