void convert(NTL::ZZX& out, const NTL::Vec<long>& in)
{
out.SetLength(in.length());
for (long i=0; i<in.length(); i++)
out[i] = conv<ZZ>(in[i]);
out.normalize();
}
/*!
* @param n : phi(m)
*/
void pack_into_coeff(NTL::ZZX& plain, const std::vector<long>& input,
long n, bool reverse) {
long sze = static_cast<long>(input.size());
assert(sze > 0);
assert(sze <= n);
plain.SetLength(sze);
if (reverse) {
NTL::SetCoeff(plain, 0, input.back());
for (long i = 0; i < sze - 1; i++) {
NTL::SetCoeff(plain, n - i - 1, -input[i]);
}
} else {
for (long i = 0; i < sze; i++) {
NTL::SetCoeff(plain, i, input[i]);
}
}
}