Browse Source

multiplication by integer

pull/178/head
orignal 10 years ago
parent
commit
8c92c50f9a
  1. 17
      Signature.cpp

17
Signature.cpp

@ -20,7 +20,7 @@ namespace crypto @@ -20,7 +20,7 @@ namespace crypto
private:
CryptoPP::ECP::Point Sum (CryptoPP::ECP::Point p1, CryptoPP::ECP::Point p2)
CryptoPP::ECP::Point Sum (const CryptoPP::ECP::Point& p1, const CryptoPP::ECP::Point& p2)
{
CryptoPP::Integer m = d*p1.x*p2.x*p1.y*p2.y,
x = a_times_b_mod_c (p1.x*p2.y + p2.x*p1.y, (CryptoPP::Integer::One() + m).InverseMod (q), q),
@ -28,10 +28,19 @@ namespace crypto @@ -28,10 +28,19 @@ namespace crypto
return CryptoPP::ECP::Point {x, y};
}
CryptoPP::ECP::Point Mul (CryptoPP::ECP::Point p, CryptoPP::Integer e)
CryptoPP::ECP::Point Mul (const CryptoPP::ECP::Point& p, const CryptoPP::Integer& e)
{
if (e.IsZero ()) return CryptoPP::ECP::Point {0, 1};
return p; // TODO
CryptoPP::ECP::Point res {0, 1};
if (!e.IsZero ())
{
auto bitCount = e.BitCount ();
for (int i = bitCount - 1; i >= 0; i--)
{
res = Sum (res, res);
if (e.GetBit (i)) res = Sum (res, p);
}
}
return res;
}
private:

Loading…
Cancel
Save