init commit

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

@@ -0,0 +1,37 @@
+using System;
+
+namespace Org.BouncyCastle.Bcpg.OpenPgp;
+
+public sealed class PgpPad
+{
+	private PgpPad()
+	{
+	}
+
+	public static byte[] PadSessionData(byte[] sessionInfo)
+	{
+		byte[] array = new byte[40];
+		Array.Copy(sessionInfo, 0, array, 0, sessionInfo.Length);
+		byte b = (byte)(array.Length - sessionInfo.Length);
+		for (int i = sessionInfo.Length; i != array.Length; i++)
+		{
+			array[i] = b;
+		}
+		return array;
+	}
+
+	public static byte[] UnpadSessionData(byte[] encoded)
+	{
+		byte b = encoded[^1];
+		for (int i = encoded.Length - b; i != encoded.Length; i++)
+		{
+			if (encoded[i] != b)
+			{
+				throw new PgpException("bad padding found in session data");
+			}
+		}
+		byte[] array = new byte[encoded.Length - b];
+		Array.Copy(encoded, 0, array, 0, array.Length);
+		return array;
+	}
+}