void poly_eval_poly(const BigPoly &poly_to_evaluate, const BigPoly &poly_to_evaluate_at,
BigPoly &destination, const MemoryPoolHandle &pool)
{
if (!pool)
{
throw invalid_argument("pool is uninitialized");
}
int poly_to_eval_coeff_uint64_count = divide_round_up(poly_to_evaluate.coeff_bit_count(), bits_per_uint64);
int value_coeff_uint64_count = divide_round_up(poly_to_evaluate_at.coeff_bit_count(), bits_per_uint64);
if (poly_to_evaluate.is_zero())
{
destination.set_zero();
return;
}
if (poly_to_evaluate_at.is_zero())
{
destination.resize(1, poly_to_evaluate.coeff_bit_count());
set_uint_uint(poly_to_evaluate.data(), poly_to_eval_coeff_uint64_count, destination.data());
return;
}
int result_coeff_count = (poly_to_evaluate.significant_coeff_count() - 1) * (poly_to_evaluate_at.significant_coeff_count() - 1) + 1;
int result_coeff_bit_count = poly_to_evaluate.coeff_bit_count() + (poly_to_evaluate.coeff_count() - 1) * poly_to_evaluate_at.coeff_bit_count();
int result_coeff_uint64_count = divide_round_up(result_coeff_bit_count, bits_per_uint64);
destination.resize(result_coeff_count, result_coeff_bit_count);
util::poly_eval_poly(poly_to_evaluate.data(), poly_to_evaluate.coeff_count(), poly_to_eval_coeff_uint64_count,
poly_to_evaluate_at.data(), poly_to_evaluate_at.coeff_count(), value_coeff_uint64_count,
result_coeff_count, result_coeff_uint64_count, destination.data(), pool);
}
void poly_eval_poly_polymod_coeffmod(const BigPoly &poly_to_evaluate, const BigPoly &poly_to_evaluate_at,
const BigPoly &poly_modulus, const BigUInt &coeff_modulus, BigPoly &destination, const MemoryPoolHandle &pool)
{
if (!pool)
{
throw invalid_argument("pool is uninitialized");
}
if (poly_to_evaluate.significant_coeff_count() > poly_modulus.coeff_count() ||
poly_to_evaluate.significant_coeff_bit_count() > coeff_modulus.significant_bit_count())
{
throw invalid_argument("poly_to_evaluate is not reduced");
}
if (poly_to_evaluate_at.significant_coeff_count() > poly_modulus.coeff_count() ||
poly_to_evaluate_at.significant_coeff_bit_count() > coeff_modulus.significant_bit_count())
{
throw invalid_argument("poly_to_evaluate_at is not reduced");
}
int poly_to_eval_coeff_uint64_count = poly_to_evaluate.coeff_uint64_count();
int coeff_modulus_bit_count = coeff_modulus.significant_bit_count();
if (poly_to_evaluate.is_zero())
{
destination.set_zero();
}
if (poly_to_evaluate_at.is_zero())
{
destination.resize(1, coeff_modulus_bit_count);
modulo_uint(poly_to_evaluate.data(), poly_to_eval_coeff_uint64_count,
Modulus(coeff_modulus.data(), coeff_modulus.uint64_count(), pool),
destination.data(), pool);
return;
}
ConstPointer poly_to_eval_ptr = duplicate_poly_if_needed(poly_to_evaluate, poly_modulus.coeff_count(), coeff_modulus.uint64_count(), false, pool);
ConstPointer poly_to_eval_at_ptr = duplicate_poly_if_needed(poly_to_evaluate_at, poly_modulus.coeff_count(), coeff_modulus.uint64_count(), false, pool);
destination.resize(poly_modulus.coeff_count(), coeff_modulus_bit_count);
util::poly_eval_poly_polymod_coeffmod(poly_to_eval_ptr.get(), poly_to_eval_at_ptr.get(),
PolyModulus(poly_modulus.data(), poly_modulus.coeff_count(), poly_modulus.coeff_uint64_count()),
Modulus(coeff_modulus.data(), coeff_modulus.uint64_count(), pool),
destination.data(), pool);
}
void exponentiate_poly_polymod_coeffmod(const BigPoly &operand, const BigUInt &exponent,
const BigPoly &poly_modulus, const BigUInt &coeff_modulus, BigPoly &destination, const MemoryPoolHandle &pool)
{
if (operand.significant_coeff_count() > poly_modulus.coeff_count() ||
operand.significant_coeff_bit_count() > coeff_modulus.significant_bit_count())
{
throw invalid_argument("operand is not reduced");
}
if (exponent < 0)
{
throw invalid_argument("exponent must be a non-negative integer");
}
if (operand.is_zero() && exponent == 0)
{
throw invalid_argument("undefined operation");
}
if (!pool)
{
throw invalid_argument("pool is uninitialized");
}
if (operand.is_zero())
{
destination.set_zero();
return;
}
if (destination.coeff_bit_count() != coeff_modulus.significant_bit_count() ||
destination.coeff_count() != poly_modulus.coeff_count())
{
destination.resize(poly_modulus.coeff_count(), coeff_modulus.significant_bit_count());
}
ConstPointer operand_ptr = duplicate_poly_if_needed(operand, poly_modulus.coeff_count(), coeff_modulus.uint64_count(), false, pool);
util::exponentiate_poly_polymod_coeffmod(operand_ptr.get(), exponent.data(), exponent.uint64_count(),
PolyModulus(poly_modulus.data(), poly_modulus.coeff_count(), poly_modulus.coeff_uint64_count()),
Modulus(coeff_modulus.data(), coeff_modulus.uint64_count(), pool),
destination.data(), pool);
}
