Initial Commit

iTechSharp/srcbc/crypto/parameters/GOST3410KeyGenerationParameters.cs

@@ -0,0 +1,55 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.CryptoPro;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Crypto.Parameters
+{
+	public class Gost3410KeyGenerationParameters
+		: KeyGenerationParameters
+	{
+		private readonly Gost3410Parameters parameters;
+		private readonly DerObjectIdentifier publicKeyParamSet;
+
+		public Gost3410KeyGenerationParameters(
+			SecureRandom random,
+			Gost3410Parameters parameters)
+			: base(random, parameters.P.BitLength - 1)
+		{
+			this.parameters = parameters;
+		}
+
+		public Gost3410KeyGenerationParameters(
+			SecureRandom		random,
+			DerObjectIdentifier	publicKeyParamSet)
+			: this(random, LookupParameters(publicKeyParamSet))
+		{
+			this.publicKeyParamSet = publicKeyParamSet;
+		}
+
+		public Gost3410Parameters Parameters
+		{
+			get { return parameters; }
+		}
+
+		public DerObjectIdentifier PublicKeyParamSet
+		{
+			get { return publicKeyParamSet; }
+		}
+
+		private static Gost3410Parameters LookupParameters(
+			DerObjectIdentifier publicKeyParamSet)
+		{
+			if (publicKeyParamSet == null)
+				throw new ArgumentNullException("publicKeyParamSet");
+
+			Gost3410ParamSetParameters p = Gost3410NamedParameters.GetByOid(publicKeyParamSet);
+
+			if (p == null)
+				throw new ArgumentException("OID is not a valid CryptoPro public key parameter set", "publicKeyParamSet");
+
+			return new Gost3410Parameters(p.P, p.Q, p.A);
+		}
+	}
+}