init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Bcpg/ECPublicBcpgKey.cs

@@ -0,0 +1,71 @@
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+
+namespace Org.BouncyCastle.Bcpg;
+
+public abstract class ECPublicBcpgKey : BcpgObject, IBcpgKey
+{
+	internal DerObjectIdentifier oid;
+
+	internal BigInteger point;
+
+	public string Format => "PGP";
+
+	public virtual BigInteger EncodedPoint => point;
+
+	public virtual DerObjectIdentifier CurveOid => oid;
+
+	protected ECPublicBcpgKey(BcpgInputStream bcpgIn)
+	{
+		oid = DerObjectIdentifier.GetInstance(Asn1Object.FromByteArray(ReadBytesOfEncodedLength(bcpgIn)));
+		point = new MPInteger(bcpgIn).Value;
+	}
+
+	protected ECPublicBcpgKey(DerObjectIdentifier oid, ECPoint point)
+	{
+		this.point = new BigInteger(1, point.GetEncoded(compressed: false));
+		this.oid = oid;
+	}
+
+	protected ECPublicBcpgKey(DerObjectIdentifier oid, BigInteger encodedPoint)
+	{
+		point = encodedPoint;
+		this.oid = oid;
+	}
+
+	public override byte[] GetEncoded()
+	{
+		try
+		{
+			return base.GetEncoded();
+		}
+		catch (IOException)
+		{
+			return null;
+		}
+	}
+
+	public override void Encode(BcpgOutputStream bcpgOut)
+	{
+		byte[] encoded = oid.GetEncoded();
+		bcpgOut.Write(encoded, 1, encoded.Length - 1);
+		MPInteger bcpgObject = new MPInteger(point);
+		bcpgOut.WriteObject(bcpgObject);
+	}
+
+	protected static byte[] ReadBytesOfEncodedLength(BcpgInputStream bcpgIn)
+	{
+		int num = bcpgIn.ReadByte();
+		if (num == 0 || num == 255)
+		{
+			throw new IOException("future extensions not yet implemented.");
+		}
+		byte[] array = new byte[num + 2];
+		bcpgIn.ReadFully(array, 2, array.Length - 2);
+		array[0] = 6;
+		array[1] = (byte)num;
+		return array;
+	}
+}