Novacoin/CKeyPair.cs

   1 \feffusing System.Collections.Generic;
   2 using System.Linq;
   3 using System.Text;
   4
   5 using Org.BouncyCastle.Math;
   6 using Org.BouncyCastle.Math.EC;
   7
   8 using Org.BouncyCastle.Crypto;
   9 using Org.BouncyCastle.Crypto.Generators;
  10 using Org.BouncyCastle.Crypto.Parameters;
  11 using Org.BouncyCastle.Security;
  12
  13
  14 namespace Novacoin
  15 {
  16     public class CKeyPair : CKey
  17     {
  18         private ECPrivateKeyParameters _Private;
  19
  20         /// <summary>
  21         /// Initialize new CKeyPair instance with random secret.
  22         /// </summary>
  23         public CKeyPair()
  24         {
  25             ECKeyGenerationParameters genParams = new ECKeyGenerationParameters(domain, new SecureRandom());
  26             ECKeyPairGenerator generator = new ECKeyPairGenerator("ECDSA");
  27             generator.Init(genParams);
  28             AsymmetricCipherKeyPair ecKeyPair = generator.GenerateKeyPair();
  29
  30             _Public = (ECPublicKeyParameters)ecKeyPair.Public;
  31             _Private = (ECPrivateKeyParameters)ecKeyPair.Private;
  32         }
  33
  34         /// <summary>
  35         /// Init key pair using secret sequence of bytes
  36         /// </summary>
  37         /// <param name="secretBytes">Byte sequence</param>
  38         public CKeyPair(IEnumerable<byte> secretBytes)
  39         {
  40             // Deserialize secret value
  41             BigInteger D = new BigInteger(secretBytes.ToArray());
  42
  43             // Calculate public key
  44             ECPoint Q = curve.G.Multiply(D);
  45
  46             _Public = new ECPublicKeyParameters(Q, domain);
  47             _Private = new ECPrivateKeyParameters(D, domain);
  48         }
  49
  50         /// <summary>
  51         /// Create signature for supplied data
  52         /// </summary>
  53         /// <param name="data">Data bytes sequence</param>
  54         /// <returns>Signature bytes sequence</returns>
  55         public IEnumerable<byte> Sign(IEnumerable<byte> data)
  56         {
  57             byte[] dataBytes = data.ToArray();
  58
  59             ISigner signer = SignerUtilities.GetSigner("SHA-256withECDSA");
  60             signer.Init(true, _Private);
  61             signer.BlockUpdate(dataBytes, 0, dataBytes.Length);
  62
  63             return signer.GenerateSignature();
  64         }
  65
  66         public CPubKey GetPubKey()
  67         {
  68             return new CPubKey(Public);
  69         }
  70
  71         /// <summary>
  72         /// Secret part of key pair
  73         /// </summary>
  74         public IEnumerable<byte> Secret
  75         {
  76             get { return _Private.D.ToByteArray(); }
  77         }
  78
  79         public override string ToString()
  80         {
  81             StringBuilder sb = new StringBuilder();
  82
  83             sb.AppendFormat("CKeyPair(Secret={0}, Public={1})", Interop.ToHex(Secret), Interop.ToHex(Public));
  84
  85             return sb.ToString();
  86         }
  87     }
  88 }