1 files changed, 118 insertions, 0 deletions
diff --git a/Crypto/src/asn1/sec/ECPrivateKeyStructure.cs b/Crypto/src/asn1/sec/ECPrivateKeyStructure.cs
new file mode 100644
index 000000000..2e9c27fd2
--- /dev/null
+++ b/Crypto/src/asn1/sec/ECPrivateKeyStructure.cs
@@ -0,0 +1,118 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+
+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)
+		{
+			if (key == null)
+				throw new ArgumentNullException("key");
+
+			this.seq = new DerSequence(
+				new DerInteger(1),
+				new DerOctetString(key.ToByteArrayUnsigned()));
+		}
+
+		public ECPrivateKeyStructure(
+			BigInteger		key,
+			Asn1Encodable	parameters)
+			: this(key, null, parameters)
+		{
+		}
+
+		public ECPrivateKeyStructure(
+			BigInteger		key,
+			DerBitString	publicKey,
+			Asn1Encodable	parameters)
+		{
+			if (key == null)
+				throw new ArgumentNullException("key");
+
+			Asn1EncodableVector v = new Asn1EncodableVector(
+				new DerInteger(1),
+				new DerOctetString(key.ToByteArrayUnsigned()));
+
+			if (parameters != null)
+			{
+				v.Add(new DerTaggedObject(true, 0, parameters));
+			}
+
+			if (publicKey != null)
+			{
+				v.Add(new DerTaggedObject(true, 1, publicKey));
+			}
+
+			this.seq = new DerSequence(v);
+		}
+
+		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;
+		}
+	}
+}