78 lines
2.4 KiB
C++
78 lines
2.4 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;
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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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size_t characteristic, exponent, *irreducible, irreducible_size;
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// Effective storage params
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size_t binary_block_size, data_size;
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// Value of this GF object
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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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// Logic
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GALOIS_API static void iadd(size_t * data, size_t data_size, size_t bin_size, size_t * state, size_t state_size, size_t characteristic); // Addition
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GALOIS_API static void isub(size_t * data, size_t data_size, size_t bin_size, size_t * state, size_t state_size, size_t characteristic); // Subtraction
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GALOIS_API static void imul(size_t * data, size_t data_size, size_t bin_size, size_t * state, size_t state_size, size_t characteristic, size_t high1, size_t high2); // Multiplication
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GALOIS_API static void iinv(size_t * state, size_t state_size); // Multiplicative inverse
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GALOIS_API static void ilsh(size_t * state, size_t state_size, size_t bin_size, size_t characteristic, size_t shiftc); // Left shift
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// Data management. Don't look at these unless you want a headache
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GALOIS_API static size_t _mask(size_t bits, bool side);
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GALOIS_API static size_t get_value(size_t idx, size_t block_size, size_t * from);
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GALOIS_API static void set_value(size_t idx, size_t value, size_t block_size, size_t characteristic, size_t * to);
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GALOIS_API static size_t high_factor(size_t * state, size_t state_size, size_t bin_size, bool * noBits);
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};
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}
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}
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