// generates new public and secret keys
void PublicKeyGen(Integer secretKey, Integer& publicKeyX, Integer& publicKeyY)
{
Integer q;
ECP ec;
ECPPoint G, Q;
LoadSECP256r1Curve(q, ec, G);
Q = ec.ScalarMultiply(G, secretKey);
publicKeyX = Q.x;
publicKeyY = Q.y;
}
void Sign(Integer& sigE, Integer& sigS, const Integer& secretKey,
const byte* message, int mlen, AutoSeededRandomPool& rng)
{
Integer q,k;
ECP ec;
ECPPoint G, r;
LoadSECP256r1Curve(q, ec, G);
k = Integer(rng, 256) % q; // choose random k
r = ec.ScalarMultiply(G, k); // r = G^k
sigE = HashPointMessage(ec, r, message, mlen) % q; // e = H(M||r)
sigS = (k - secretKey*sigE) % q;
}
// generates new public and secret keys
void KeyGen(Integer& secretKey, Integer& publicKeyX, Integer& publicKeyY, AutoSeededRandomPool& rng)
{
Integer q;
ECP ec;
ECPPoint G, Q;
LoadSECP256r1Curve(q, ec, G);
secretKey = Integer(rng, 256) % q;
Q = ec.ScalarMultiply(G, secretKey);
publicKeyX = Q.x;
publicKeyY = Q.y;
}
