init commit

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

@@ -0,0 +1,93 @@
+using System;
+using System.IO;
+using Org.BouncyCastle.Utilities.Date;
+
+namespace Org.BouncyCastle.Bcpg;
+
+public class PublicKeyPacket : ContainedPacket
+{
+	private int version;
+
+	private long time;
+
+	private int validDays;
+
+	private PublicKeyAlgorithmTag algorithm;
+
+	private IBcpgKey key;
+
+	public virtual int Version => version;
+
+	public virtual PublicKeyAlgorithmTag Algorithm => algorithm;
+
+	public virtual int ValidDays => validDays;
+
+	public virtual IBcpgKey Key => key;
+
+	internal PublicKeyPacket(BcpgInputStream bcpgIn)
+	{
+		version = bcpgIn.ReadByte();
+		time = (uint)((bcpgIn.ReadByte() << 24) | (bcpgIn.ReadByte() << 16) | (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte());
+		if (version <= 3)
+		{
+			validDays = (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte();
+		}
+		algorithm = (PublicKeyAlgorithmTag)bcpgIn.ReadByte();
+		switch (algorithm)
+		{
+		case PublicKeyAlgorithmTag.RsaGeneral:
+		case PublicKeyAlgorithmTag.RsaEncrypt:
+		case PublicKeyAlgorithmTag.RsaSign:
+			key = new RsaPublicBcpgKey(bcpgIn);
+			break;
+		case PublicKeyAlgorithmTag.Dsa:
+			key = new DsaPublicBcpgKey(bcpgIn);
+			break;
+		case PublicKeyAlgorithmTag.ElGamalEncrypt:
+		case PublicKeyAlgorithmTag.ElGamalGeneral:
+			key = new ElGamalPublicBcpgKey(bcpgIn);
+			break;
+		case PublicKeyAlgorithmTag.EC:
+			key = new ECDHPublicBcpgKey(bcpgIn);
+			break;
+		case PublicKeyAlgorithmTag.ECDsa:
+			key = new ECDsaPublicBcpgKey(bcpgIn);
+			break;
+		default:
+			throw new IOException("unknown PGP public key algorithm encountered");
+		}
+	}
+
+	public PublicKeyPacket(PublicKeyAlgorithmTag algorithm, DateTime time, IBcpgKey key)
+	{
+		version = 4;
+		this.time = DateTimeUtilities.DateTimeToUnixMs(time) / 1000;
+		this.algorithm = algorithm;
+		this.key = key;
+	}
+
+	public virtual DateTime GetTime()
+	{
+		return DateTimeUtilities.UnixMsToDateTime(time * 1000);
+	}
+
+	public virtual byte[] GetEncodedContents()
+	{
+		MemoryStream memoryStream = new MemoryStream();
+		BcpgOutputStream bcpgOutputStream = new BcpgOutputStream(memoryStream);
+		bcpgOutputStream.WriteByte((byte)version);
+		bcpgOutputStream.WriteInt((int)time);
+		if (version <= 3)
+		{
+			bcpgOutputStream.WriteShort((short)validDays);
+		}
+		bcpgOutputStream.WriteByte((byte)algorithm);
+		bcpgOutputStream.WriteObject((BcpgObject)key);
+		return memoryStream.ToArray();
+	}
+
+	public override void Encode(BcpgOutputStream bcpgOut)
+	{
+		bcpgOut.WritePacket(PacketTag.PublicKey, GetEncodedContents(), oldFormat: true);
+	}
+}