Initial Commit

iTechSharp/srcbc/crypto/parameters/ECKeyParameters.cs

@@ -0,0 +1,121 @@
+using System;
+using System.Globalization;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.CryptoPro;
+
+namespace Org.BouncyCastle.Crypto.Parameters
+{
+    public abstract class ECKeyParameters
+		: AsymmetricKeyParameter
+    {
+		private readonly string algorithm;
+		private readonly ECDomainParameters parameters;
+		private readonly DerObjectIdentifier publicKeyParamSet;
+
+		protected ECKeyParameters(
+			string				algorithm,
+            bool				isPrivate,
+            ECDomainParameters	parameters)
+			: base(isPrivate)
+        {
+			if (algorithm == null)
+				throw new ArgumentNullException("algorithm");
+			if (parameters == null)
+				throw new ArgumentNullException("parameters");
+
+			this.algorithm = VerifyAlgorithmName(algorithm);
+			this.parameters = parameters;
+        }
+
+		protected ECKeyParameters(
+			string				algorithm,
+			bool				isPrivate,
+			DerObjectIdentifier	publicKeyParamSet)
+			: base(isPrivate)
+		{
+			if (algorithm == null)
+				throw new ArgumentNullException("algorithm");
+			if (publicKeyParamSet == null)
+				throw new ArgumentNullException("publicKeyParamSet");
+
+			this.algorithm = VerifyAlgorithmName(algorithm);
+			this.parameters = LookupParameters(publicKeyParamSet);
+			this.publicKeyParamSet = publicKeyParamSet;
+		}
+
+		public string AlgorithmName
+		{
+			get { return algorithm; }
+		}
+
+		public ECDomainParameters Parameters
+        {
+			get { return parameters; }
+        }
+
+		public DerObjectIdentifier PublicKeyParamSet
+		{
+			get { return publicKeyParamSet; }
+		}
+
+		public override bool Equals(
+			object obj)
+		{
+			if (obj == this)
+				return true;
+
+			ECDomainParameters other = obj as ECDomainParameters;
+
+			if (other == null)
+				return false;
+
+			return Equals(other);
+		}
+
+		protected bool Equals(
+			ECKeyParameters other)
+		{
+			return parameters.Equals(other.parameters) && base.Equals(other);
+		}
+
+		public override int GetHashCode()
+		{
+			return parameters.GetHashCode() ^ base.GetHashCode();
+		}
+
+		private string VerifyAlgorithmName(
+			string algorithm)
+		{
+			string upper = algorithm.ToUpper(CultureInfo.InvariantCulture);
+
+			switch (upper)
+			{
+				case "EC":
+				case "ECDSA":
+				case "ECGOST3410":
+				case "ECDH":
+				case "ECDHC":
+					break;
+				default:
+					throw new ArgumentException("unrecognised algorithm: " + algorithm, "algorithm");
+			}
+
+			return upper;
+		}
+
+		private static ECDomainParameters LookupParameters(
+			DerObjectIdentifier publicKeyParamSet)
+		{
+			if (publicKeyParamSet == null)
+				throw new ArgumentNullException("publicKeyParamSet");
+
+			ECDomainParameters p = ECGost3410NamedCurves.GetByOid(publicKeyParamSet);
+
+			if (p == null)
+				throw new ArgumentException("OID is not a valid CryptoPro public key parameter set", "publicKeyParamSet");
+
+			return p;
+		}
+	}
+}