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33 lines
666 B
C++
33 lines
666 B
C++
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/*
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Copyright (c) 2020 tevador <tevador@gmail.com>
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All rights reserved.
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*/
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#include <monero_seed/galois_field.hpp>
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template<unsigned bits, gf_item primitive>
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galois_field<bits, primitive>::galois_field() {
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gf_item b = 1;
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for (gf_item i = 0; i < size_; ++i) {
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log_table[b] = i;
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exp_table[i] = b;
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b <<= 1;
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if ((b & size_) != 0)
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b ^= primitive;
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}
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for (auto i = size_ - 1; i < (2 * size_); ++i) {
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exp_table[i] = exp_table[i - (size_ - 1)];
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}
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for (gf_item i = 2; i < size_; i++) {
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for (gf_item j = 2; j < size_; j++) {
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auto p = mult(i, j);
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if (p == 1) {
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inv_table[i] = j;
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break;
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}
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}
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}
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}
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template class galois_field<11, 2053>;
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