Novacoin/CKey.cs

   1 \feffusing System.Collections.Generic;
   2 using System.Linq;
   3
   4 using Org.BouncyCastle.Crypto;
   5 using Org.BouncyCastle.Crypto.Parameters;
   6
   7 using Org.BouncyCastle.Asn1.X9;
   8 using Org.BouncyCastle.Security;
   9 using Org.BouncyCastle.Asn1.Sec;
  10
  11 namespace Novacoin
  12 {
  13     /// <summary>
  14     /// Basic pubkey functionality
  15     /// </summary>
  16     public abstract class CKey
  17     {
  18         // These fields are inherited by CPubKey and CKeyPair
  19         protected ECPublicKeyParameters _Public;
  20
  21         protected static X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
  22         protected static ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H, curve.GetSeed());
  23
  24         /// <summary>
  25         /// Does the signature matches our public key?
  26         /// </summary>
  27         /// <param name="data">Data bytes</param>
  28         /// <param name="signature">Signature bytes</param>
  29         /// <returns>Checking result</returns>
  30         public bool VerifySignature(IEnumerable<byte> data, IEnumerable<byte> signature)
  31         {
  32             byte[] dataBytes = data.ToArray();
  33
  34             ISigner signer = SignerUtilities.GetSigner("SHA-256withECDSA");
  35             signer.Init(false, _Public);
  36             signer.BlockUpdate(dataBytes, 0, dataBytes.Length);
  37
  38             return signer.VerifySignature(signature.ToArray());
  39         }
  40
  41         /// <summary>
  42         /// Calculate Hash160 and create new CKeyID instance.
  43         /// </summary>
  44         /// <returns>New key ID</returns>
  45         public CKeyID GetKeyID()
  46         {
  47             return new CKeyID(Hash160.Compute160(Public));
  48         }
  49
  50         /// <summary>
  51         /// Public part of key pair
  52         /// </summary>
  53         public IEnumerable<byte> Public
  54         {
  55             get { return _Public.Q.GetEncoded(); }
  56         }
  57     }
  58 }