Novacoin/CKeyPair.cs

   1 \feffusing System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4 using System.Text;
   5 using System.Threading.Tasks;
   6
   7 using Org.BouncyCastle.Math;
   8 using Org.BouncyCastle.Math.EC;
   9
  10 using Org.BouncyCastle.Crypto;
  11 using Org.BouncyCastle.Crypto.Generators;
  12 using Org.BouncyCastle.Crypto.Parameters;
  13
  14 using Org.BouncyCastle.Asn1.X9;
  15 using Org.BouncyCastle.Security;
  16 using Org.BouncyCastle.Asn1.Sec;
  17
  18 namespace Novacoin
  19 {
  20     public class CKeyPair
  21     {
  22         private BigInteger D;
  23         private ECPoint Q;
  24
  25         private static X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
  26         private static ECDomainParameters domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H, curve.GetSeed());
  27
  28         /// <summary>
  29         /// Initialize new CKeyPair instance with random secret.
  30         /// </summary>
  31         public CKeyPair()
  32         {
  33             ECKeyGenerationParameters genParams = new ECKeyGenerationParameters(domain, new SecureRandom());
  34
  35             ECKeyPairGenerator generator = new ECKeyPairGenerator("ECDSA");
  36             generator.Init(genParams);
  37             AsymmetricCipherKeyPair ecKeyPair = generator.GenerateKeyPair();
  38
  39             Q = ((ECPublicKeyParameters)ecKeyPair.Public).Q;
  40             D = ((ECPrivateKeyParameters)ecKeyPair.Private).D;
  41         }
  42
  43         /// <summary>
  44         /// Init key pair using secret sequence of bytes
  45         /// </summary>
  46         /// <param name="secretBytes">Byte sequence</param>
  47         public CKeyPair(IEnumerable<byte> secretBytes)
  48         {
  49             D = new BigInteger(secretBytes.ToArray());
  50             Q = curve.G.Multiply(D);
  51         }
  52
  53         /// <summary>
  54         /// Secret part of key pair
  55         /// </summary>
  56         public IEnumerable<byte> Secret
  57         {
  58             get { return D.ToByteArray(); }
  59         }
  60
  61         /// <summary>
  62         /// Public part of key pair
  63         /// </summary>
  64         public IEnumerable<byte> Public
  65         {
  66             get { return Q.GetEncoded(); }
  67         }
  68
  69         public override string ToString()
  70         {
  71             StringBuilder sb = new StringBuilder();
  72
  73             sb.AppendFormat("CKeyPair(Secret={0}, Public={1})", Interop.ToHex(Secret), Interop.ToHex(Public));
  74
  75             return sb.ToString();
  76         }
  77     }
  78 }