74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
#pragma once
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#if defined(__MINGW32__) || defined(_WIN32)
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#if defined(GALOIS_API)
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#define GALOIS_API __declspec(dllexport)
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#else
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#define GALOIS_API __declspec(dllimport)
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#endif
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#endif
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#ifndef GALOIS_API
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#if __GNUC__ >= 4
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#define GALOIS_API __attribute__ ((visibility ("default")))
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#else
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#define GALOIS_API
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#endif
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#endif
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namespace CryptoCPP {
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namespace Math {
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class Galois
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{
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public:
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GALOIS_API Galois(
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size_t characteristic,
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size_t exponent,
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size_t * irreducible,
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size_t irreducible_size,
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size_t * value
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);
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GALOIS_API ~Galois();
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// Addition
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GALOIS_API Galois * add(const Galois * value) const;
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// Subtraction
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GALOIS_API Galois * sub(const Galois * value) const;
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// Multiplication
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GALOIS_API Galois * mul(const Galois * value) const;
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// Inverse multiplication
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GALOIS_API Galois * inv(const Galois * value) const;
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protected:
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static const size_t high_bit = 1 << ((sizeof(size_t)*8)-1);
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// GF parameters
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const size_t characteristic, exponent, irreducible;
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// Effective storage params
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const size_t binary_block_size, data_size;
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// Value of this GF object
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const size_t * data;
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// Reduce the value of this galois to fit characteristic
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GALOIS_API void reduce();
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// Self-mutable operations
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GALOIS_API void iadd(const Galois * value);
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GALOIS_API void isub(const Galois * value);
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GALOIS_API void imul(const Galois * value);
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GALOIS_API void iinv(const Galois * value);
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GALOIS_API size_t _mask(size_t bits, bool side) const;
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GALOIS_API size_t get_value(size_t idx) const;
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GALOIS_API void set_value(size_t idx, size_t value);
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};
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}
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}
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