Initial Commit

iTechSharp/srcbc/asn1/sec/ECPrivateKeyStructure.cs

@@ -0,0 +1,82 @@
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+
+using System;
+
+namespace Org.BouncyCastle.Asn1.Sec
+{
+    /**
+     * the elliptic curve private key object from SEC 1
+     */
+    public class ECPrivateKeyStructure
+        : Asn1Encodable
+    {
+        private readonly Asn1Sequence seq;
+
+        public ECPrivateKeyStructure(
+            Asn1Sequence seq)
+        {
+			if (seq == null)
+				throw new ArgumentNullException("seq");
+
+			this.seq = seq;
+        }
+
+		public ECPrivateKeyStructure(
+            BigInteger key)
+        {
+			this.seq = new DerSequence(
+				new DerInteger(1),
+				new DerOctetString(key.ToByteArrayUnsigned()));
+        }
+
+		public BigInteger GetKey()
+        {
+            Asn1OctetString octs = (Asn1OctetString) seq[1];
+
+			return new BigInteger(1, octs.GetOctets());
+        }
+
+		public DerBitString GetPublicKey()
+		{
+			return (DerBitString) GetObjectInTag(1);
+		}
+
+		public Asn1Object GetParameters()
+		{
+			return GetObjectInTag(0);
+		}
+
+		private Asn1Object GetObjectInTag(
+			int tagNo)
+		{
+			foreach (Asn1Encodable ae in seq)
+			{
+				Asn1Object obj = ae.ToAsn1Object();
+
+				if (obj is Asn1TaggedObject)
+				{
+					Asn1TaggedObject tag = (Asn1TaggedObject) obj;
+					if (tag.TagNo == tagNo)
+					{
+						return tag.GetObject();
+					}
+				}
+			}
+
+			return null;
+		}
+
+		/**
+		 * ECPrivateKey ::= SEQUENCE {
+		 *     version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
+		 *     privateKey OCTET STRING,
+		 *     parameters [0] Parameters OPTIONAL,
+		 *     publicKey [1] BIT STRING OPTIONAL }
+		 */
+		public override Asn1Object ToAsn1Object()
+        {
+            return seq;
+        }
+    }
+}