ECPublicBcpgKey
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using System.IO;
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 = MPInteger.ToMpiBigInteger(point);
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)
throw new EndOfStreamException();
if (num == 0 || num == 255)
throw new IOException("future extensions not yet implemented");
if (num > 127)
throw new IOException("unsupported OID");
byte[] array = new byte[num + 2];
bcpgIn.ReadFully(array, 2, array.Length - 2);
array[0] = 6;
array[1] = (byte)num;
return array;
}
}
}