Add CKeyPair basic implementation & test

[NovacoinLibrary.git] / Novacoin / CKeyPair.cs

diff --git a/Novacoin/CKeyPair.cs b/Novacoin/CKeyPair.cs
new file mode 100644 (file)
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+++ b/Novacoin/CKeyPair.cs
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+\feffusing System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Generators;
+using Org.BouncyCastle.Crypto.Parameters;
+
+using Org.BouncyCastle.Asn1.X9;
+using Org.BouncyCastle.Security;
+using Org.BouncyCastle.Asn1.Sec;
+
+namespace Novacoin
+{
+    public class CKeyPair
+    {
+        private BigInteger D;
+        private ECPoint Q;
+
+        private static X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
+        private static ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H, curve.GetSeed());
+
+        /// <summary>
+        /// Initialize new CKeyPair instance with random secret.
+        /// </summary>
+        public CKeyPair()
+        {
+            ECKeyGenerationParameters genParams = new ECKeyGenerationParameters(domain, new SecureRandom());
+
+            ECKeyPairGenerator generator = new ECKeyPairGenerator("ECDSA");
+            generator.Init(genParams);
+            AsymmetricCipherKeyPair ecKeyPair = generator.GenerateKeyPair();
+
+            Q = ((ECPublicKeyParameters)ecKeyPair.Public).Q;
+            D = ((ECPrivateKeyParameters)ecKeyPair.Private).D;
+        }
+
+        /// <summary>
+        /// Init key pair using secret sequence of bytes
+        /// </summary>
+        /// <param name="secretBytes">Byte sequence</param>
+        public CKeyPair(IEnumerable<byte> secretBytes)
+        {
+            D = new BigInteger(secretBytes.ToArray());
+            Q = curve.G.Multiply(D);
+        }
+
+        /// <summary>
+        /// Secret part of key pair
+        /// </summary>
+        public IEnumerable<byte> Secret
+        {
+            get { return D.ToByteArray(); }
+        }
+
+        /// <summary>
+        /// Public part of key pair
+        /// </summary>
+        public IEnumerable<byte> Public
+        {
+            get { return Q.GetEncoded(); }
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+
+            sb.AppendFormat("CKeyPair(Secret={0}, Public={1})", Interop.ToHex(Secret), Interop.ToHex(Public));
+
+            return sb.ToString();
+        }
+    }
+}