init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Bcpg/OpenPgp/PgpKeyRing.cs

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+using System.Collections;
+using System.IO;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg.OpenPgp;
+
+public abstract class PgpKeyRing : PgpObject
+{
+	internal PgpKeyRing()
+	{
+	}
+
+	internal static TrustPacket ReadOptionalTrustPacket(BcpgInputStream bcpgInput)
+	{
+		if (bcpgInput.NextPacketTag() != PacketTag.Trust)
+		{
+			return null;
+		}
+		return (TrustPacket)bcpgInput.ReadPacket();
+	}
+
+	internal static IList ReadSignaturesAndTrust(BcpgInputStream bcpgInput)
+	{
+		try
+		{
+			IList list = Platform.CreateArrayList();
+			while (bcpgInput.NextPacketTag() == PacketTag.Signature)
+			{
+				SignaturePacket sigPacket = (SignaturePacket)bcpgInput.ReadPacket();
+				TrustPacket trustPacket = ReadOptionalTrustPacket(bcpgInput);
+				list.Add(new PgpSignature(sigPacket, trustPacket));
+			}
+			return list;
+		}
+		catch (PgpException ex)
+		{
+			throw new IOException("can't create signature object: " + ex.Message, ex);
+		}
+	}
+
+	internal static void ReadUserIDs(BcpgInputStream bcpgInput, out IList ids, out IList idTrusts, out IList idSigs)
+	{
+		ids = Platform.CreateArrayList();
+		idTrusts = Platform.CreateArrayList();
+		idSigs = Platform.CreateArrayList();
+		while (bcpgInput.NextPacketTag() == PacketTag.UserId || bcpgInput.NextPacketTag() == PacketTag.UserAttribute)
+		{
+			Packet packet = bcpgInput.ReadPacket();
+			if (packet is UserIdPacket)
+			{
+				UserIdPacket userIdPacket = (UserIdPacket)packet;
+				ids.Add(userIdPacket.GetId());
+			}
+			else
+			{
+				UserAttributePacket userAttributePacket = (UserAttributePacket)packet;
+				ids.Add(new PgpUserAttributeSubpacketVector(userAttributePacket.GetSubpackets()));
+			}
+			idTrusts.Add(ReadOptionalTrustPacket(bcpgInput));
+			idSigs.Add(ReadSignaturesAndTrust(bcpgInput));
+		}
+	}
+}