1 files changed, 97 insertions, 0 deletions
diff --git a/crypto/src/bcpg/ECPublicBCPGKey.cs b/crypto/src/bcpg/ECPublicBCPGKey.cs
new file mode 100644
index 000000000..f328f9dc3
--- /dev/null
+++ b/crypto/src/bcpg/ECPublicBCPGKey.cs
@@ -0,0 +1,97 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+
+namespace Org.BouncyCastle.Bcpg
+{
+    /// <remarks>Base class for an EC Public Key.</remarks>
+    public abstract class ECPublicBcpgKey
+        : BcpgObject, IBcpgKey
+    {
+        internal DerObjectIdentifier oid;
+        internal BigInteger point;
+
+        /// <param name="bcpgIn">The stream to read the packet from.</param>
+        protected ECPublicBcpgKey(
+            BcpgInputStream bcpgIn)
+        {
+            this.oid = DerObjectIdentifier.GetInstance(Asn1Object.FromByteArray(ReadBytesOfEncodedLength(bcpgIn)));
+            this.point = new MPInteger(bcpgIn).Value;
+        }
+
+        protected ECPublicBcpgKey(
+            DerObjectIdentifier oid,
+            ECPoint point)
+        {
+            this.point = new BigInteger(1, point.GetEncoded());
+            this.oid = oid;
+        }
+
+        protected ECPublicBcpgKey(
+            DerObjectIdentifier oid,
+            BigInteger encodedPoint)
+        {
+            this.point = encodedPoint;
+            this.oid = oid;
+        }
+
+        /// <summary>The format, as a string, always "PGP".</summary>
+        public string Format
+        {
+            get { return "PGP"; }
+        }
+
+        /// <summary>Return the standard PGP encoding of the key.</summary>
+        public override byte[] GetEncoded()
+        {
+            try
+            {
+                return base.GetEncoded();
+            }
+            catch (IOException)
+            {
+                return null;
+            }
+        }
+
+        public override void Encode(
+            BcpgOutputStream bcpgOut)
+        {
+            byte[] oid = this.oid.GetEncoded();
+            bcpgOut.Write(oid, 1, oid.Length - 1);
+
+            MPInteger point = new MPInteger(this.point);
+            bcpgOut.WriteObject(point);
+        }
+
+        public virtual BigInteger EncodedPoint
+        {
+            get { return point; }
+        }
+
+        public virtual DerObjectIdentifier CurveOid
+        {
+            get { return oid; }
+        }
+
+        protected static byte[] ReadBytesOfEncodedLength(
+            BcpgInputStream bcpgIn)
+        {
+            int length = bcpgIn.ReadByte();
+            if (length == 0 || length == 0xFF)
+            {
+                throw new IOException("future extensions not yet implemented.");
+            }
+
+            byte[] buffer = new byte[length + 2];
+            bcpgIn.ReadFully(buffer, 2, buffer.Length - 2);
+            buffer[0] = (byte)0x06;
+            buffer[1] = (byte)length;
+
+            return buffer;
+        }
+    }
+}