Remove Hash, Hash256, Hash160 and ScryptHash256 classes.

[NovacoinLibrary.git] / Novacoin / CKey.cs

diff --git a/Novacoin/CKey.cs b/Novacoin/CKey.cs
index 875ac7f..672f0be 100644 (file)
--- a/Novacoin/CKey.cs
+++ b/Novacoin/CKey.cs
@@ -1,48 +1,113 @@
-\feffusing System;
+\feff/**
+ *  Novacoin classes library
+ *  Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using Org.BouncyCastle.Asn1.Sec;
+using Org.BouncyCastle.Asn1.X9;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Math.EC;
+using Org.BouncyCastle.Security;
+
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+
 
 namespace Novacoin
 {
     /// <summary>
-    /// Representation of ECDSA private key
+    /// Basic pubkey functionality
     /// </summary>
-    public class CKey
+    public abstract class CKey
     {
+        // These fields are inherited by CPubKey and CKeyPair
+        protected ECPublicKeyParameters _Public;
+
+        protected static X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
+        protected static ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H, curve.GetSeed());
+
         /// <summary>
-        /// Private key bytes
+        /// Regenerate public key parameters (ECPoint compression)
         /// </summary>
-        private List<byte> privKeyBytes;
+        /// <param name="pubKeyParams">Non-compressed key parameters</param>
+        /// <returns>Parameters for compressed key</returns>
+        protected ECPublicKeyParameters Compress(ECPublicKeyParameters pubKeyParams)
+        {
+            if (pubKeyParams.Q.IsCompressed)
+            {
+                // Already compressed
+                return pubKeyParams;
+            }
+
+            ECPoint q = new FpPoint(curve.Curve, pubKeyParams.Q.X, pubKeyParams.Q.Y, true);
+
+            return new ECPublicKeyParameters(q, domain);
+        }
 
         /// <summary>
-        /// Initialize new instance of CKey as copy of another instance.
+        /// Regenerate public key parameters (ECPoint decompression)
         /// </summary>
-        /// <param name="key">New CKey instance.</param>
-        public CKey(CKey key)
+        /// <param name="pubKeyParams">Compressed key parameters</param>
+        /// <returns>Parameters for non-compressed key</returns>
+        protected ECPublicKeyParameters Decompress(ECPublicKeyParameters pubKeyParams)
         {
-            privKeyBytes = key.privKeyBytes;
+            if (!pubKeyParams.Q.IsCompressed)
+            {
+                // Isn't compressed
+                return pubKeyParams;
+            }
+
+            var q = new FpPoint(curve.Curve, pubKeyParams.Q.X, pubKeyParams.Q.Y, false);
+
+            return new ECPublicKeyParameters(q, domain);
         }
 
         /// <summary>
-        /// Initialize new instance of CKey using supplied byte sequence.
+        /// Does the signature matches our public key?
         /// </summary>
-        /// <param name="bytes">New CKey instance.</param>
-        public CKey(IEnumerable<byte> bytes)
+        /// <param name="sigHash">Data hash</param>
+        /// <param name="signature">Signature bytes</param>
+        /// <returns>Checking result</returns>
+        public bool VerifySignature(uint256 sigHash, byte[] signature)
         {
-            privKeyBytes = new List<byte>(bytes);
+            var signer = SignerUtilities.GetSigner("NONEwithECDSA");
+            signer.Init(false, _Public);
+            signer.BlockUpdate(sigHash, 0, sigHash.Size);
+
+            return signer.VerifySignature(signature);
         }
 
         /// <summary>
-        /// Calculate public key for this private key.
+        /// Calculate Hash160 and create new CKeyID instance.
         /// </summary>
-        /// <returns>New CPubKey instance.</returns>
-        public CPubKey GetPubKey()
+        /// <returns>New key ID</returns>
+        public CKeyID KeyID
         {
-            // stub
+            get { return new CKeyID(CryptoUtils.ComputeHash160(_Public.Q.GetEncoded())); }
+        }
 
-            return new CPubKey((CPubKey)null);
+        /// <summary>
+        /// Is this a compressed public key?
+        /// </summary>
+        /// <returns></returns>
+        public bool IsCompressed
+        {
+            get { return _Public.Q.IsCompressed; }
         }
+
     }
 }