init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Bcpg/Sig/KeyExpirationTime.cs

@@ -0,0 +1,27 @@
+namespace Org.BouncyCastle.Bcpg.Sig;
+
+public class KeyExpirationTime : SignatureSubpacket
+{
+	public long Time => ((long)(data[0] & 0xFF) << 24) | ((long)(data[1] & 0xFF) << 16) | ((long)(data[2] & 0xFF) << 8) | (long)((ulong)data[3] & 0xFFuL);
+
+	protected static byte[] TimeToBytes(long t)
+	{
+		return new byte[4]
+		{
+			(byte)(t >> 24),
+			(byte)(t >> 16),
+			(byte)(t >> 8),
+			(byte)t
+		};
+	}
+
+	public KeyExpirationTime(bool critical, bool isLongLength, byte[] data)
+		: base(SignatureSubpacketTag.KeyExpireTime, critical, isLongLength, data)
+	{
+	}
+
+	public KeyExpirationTime(bool critical, long seconds)
+		: base(SignatureSubpacketTag.KeyExpireTime, critical, isLongLength: false, TimeToBytes(seconds))
+	{
+	}
+}