Integer ModularRoot(const Integer &a, const Integer &dp, const Integer &dq,
const Integer &p, const Integer &q, const Integer &u)
{
Integer p2, q2;
#pragma omp parallel
#pragma omp sections
{
#pragma omp section
p2 = ModularExponentiation((a % p), dp, p);
#pragma omp section
q2 = ModularExponentiation((a % q), dq, q);
}
return CRT(p2, p, q2, q, u);
}
/*Generate Group Parameters*/
void GetGroupParameters(Integer &g, Integer &p, Integer &q)
{
AutoSeededRandomPool rnd;
unsigned int bits = 1024;
DH dh;
dh.AccessGroupParameters().GenerateRandomWithKeySize(rnd, bits);
if(!dh.GetGroupParameters().ValidateGroup(rnd, 3))
cout << "Failed to validate prime and generator" << endl;
size_t count = 0;
p = dh.GetGroupParameters().GetModulus();
count = p.BitCount();
q = dh.GetGroupParameters().GetSubgroupOrder();
count = q.BitCount();
g = dh.GetGroupParameters().GetGenerator();
count = g.BitCount();
#ifdef DEBUG
cout << "P (" << std::dec << count << "): " << std::hex << p << endl;
cout << "Q (" << std::dec << count << "): " << std::hex << q << endl;
cout << "G (" << std::dec << count << "): " << std::dec << g << endl;
#endif
Integer v = ModularExponentiation(g, q, p);
if(v != Integer::One())
{
cout << "Failed to verify order of the subgroup" << endl;
exit(1);
}
}
