Initial Commit

iTechSharp/srcbc/asn1/x509/DSAParameter.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+    public class DsaParameter
+        : Asn1Encodable
+    {
+        internal readonly DerInteger p, q, g;
+
+		public static DsaParameter GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+        }
+
+		public static DsaParameter GetInstance(
+            object obj)
+        {
+            if(obj == null || obj is DsaParameter)
+            {
+                return (DsaParameter) obj;
+            }
+
+			if(obj is Asn1Sequence)
+            {
+                return new DsaParameter((Asn1Sequence) obj);
+            }
+
+			throw new ArgumentException("Invalid DsaParameter: " + obj.GetType().Name);
+        }
+
+		public DsaParameter(
+            BigInteger	p,
+            BigInteger	q,
+            BigInteger	g)
+        {
+            this.p = new DerInteger(p);
+            this.q = new DerInteger(q);
+            this.g = new DerInteger(g);
+        }
+
+		private DsaParameter(
+            Asn1Sequence seq)
+        {
+			if (seq.Count != 3)
+				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
+
+			this.p = DerInteger.GetInstance(seq[0]);
+			this.q = DerInteger.GetInstance(seq[1]);
+			this.g = DerInteger.GetInstance(seq[2]);
+        }
+
+		public BigInteger P
+		{
+			get { return p.PositiveValue; }
+		}
+
+		public BigInteger Q
+		{
+			get { return q.PositiveValue; }
+		}
+
+		public BigInteger G
+		{
+			get { return g.PositiveValue; }
+		}
+
+		public override Asn1Object ToAsn1Object()
+        {
+			return new DerSequence(p, q, g);
+        }
+    }
+}