initial code for Ed25519 added

Signature.cpp

@@ -0,0 +1,44 @@
+#include <cryptopp/integer.h>
+#include <cryptopp/eccrypto.h>
+#include "Signature.h"
+
+namespace i2p
+{
+namespace crypto
+{
+	class Ed25519
+	{
+		public:
+
+			Ed25519 (): b(256)
+			{
+				q = CryptoPP::Integer::Power2 (255) - CryptoPP::Integer (19); // 2^255-19
+				l = CryptoPP::Integer::Power2 (252) + CryptoPP::Integer ("27742317777372353535851937790883648493");
+				// 2^252 + 27742317777372353535851937790883648493
+				d = CryptoPP::Integer (-121665) * CryptoPP::Integer (121666).InverseMod (q); // -121665/121666
+			}
+
+		private:
+
+			CryptoPP::ECP::Point Sum (CryptoPP::ECP::Point p1, 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),
+				y = a_times_b_mod_c (p1.y*p2.y + p1.x*p2.x, (CryptoPP::Integer::One() - m).InverseMod (q), q);
+				return CryptoPP::ECP::Point {x, y};
+			}
+
+			CryptoPP::ECP::Point Mul (CryptoPP::ECP::Point p, CryptoPP::Integer e)
+			{
+				if (e.IsZero ()) return CryptoPP::ECP::Point {0, 1};
+				return p; // TODO
+			} 
+
+		private:
+
+			CryptoPP::Integer b, q, l, d; 
+	};	
+}
+}
+
+