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PolyDomain.cpp
68 lines (55 loc) · 2.17 KB
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PolyDomain.cpp
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#include <algorithm>
#include <cassert>
#include "CryptoScheme.h"
#include "FiniteField.h"
PolyDomain::PolyDomain(const PrimeField* f) : field(f) {}
const PrimeField* PolyDomain::getField() const {
return field;
}
Polynomial PolyDomain::makeElement(const BigUnsigned& c) const {
return makeElement(field->makeElement(c));
}
Polynomial PolyDomain::makeElement(const FieldElement& c) const {
/*
assert(c.getMod() == field->getMod());
if (c.getField() == field) return makeElement(std::vector<FieldElement>(1,c));
return makeElement(std::vector<FieldElement>(1, field->makeElement(c.getVal())));
*/
assert(c.getField() == field);
return makeElement(std::vector<FieldElement>(1,c));
}
Polynomial PolyDomain::makeElement(const std::vector<FieldElement>& coeffs) const {
for (auto& c : coeffs) assert(c.getField() == field);
return Polynomial(coeffs, this);
}
Polynomial PolyDomain::randomPoly(const BigUnsigned& degree) const {
std::vector<FieldElement> coefficients;
for (BigUnsigned i = 0; i <= degree; i++) {
coefficients.push_back(field->makeElement(CryptoScheme::random(field->getMod().bitLength())));
}
return makeElement(coefficients);
}
Polynomial PolyDomain::generateIrreducible(const BigUnsigned& degree) const {
Polynomial poly = randomPoly(degree);
while (!poly.isIrreducible()) poly = randomPoly(degree);
return poly;
}
Polynomial PolyDomain::operator()(const BigUnsigned& c) const {
return makeElement(field->makeElement(c));
}
Polynomial PolyDomain::operator()(const FieldElement& c) const {
return makeElement(c);
}
Polynomial PolyDomain::operator()(const std::initializer_list<FieldElement>& c) const {
return makeElement(std::vector<FieldElement>(c.begin(), c.end()));
}
Polynomial PolyDomain::operator()(const std::initializer_list<BigUnsigned>& c) const {
std::vector<FieldElement> coeffs(c.size());
std::transform(c.begin(), c.end(), coeffs.begin(), [&](const BigUnsigned& b) {
return field->makeElement(b);
});
return makeElement(coeffs);
}
std::ostream& operator<<(std::ostream &os, const PolyDomain& x) {
return os<<*x.getField()<<"[x]";
}