init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Paddings/ISO7816d4Padding.cs

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+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Crypto.Paddings;
+
+public class ISO7816d4Padding : IBlockCipherPadding
+{
+	public string PaddingName => "ISO7816-4";
+
+	public void Init(SecureRandom random)
+	{
+	}
+
+	public int AddPadding(byte[] input, int inOff)
+	{
+		int result = input.Length - inOff;
+		input[inOff] = 128;
+		for (inOff++; inOff < input.Length; inOff++)
+		{
+			input[inOff] = 0;
+		}
+		return result;
+	}
+
+	public int PadCount(byte[] input)
+	{
+		int num = input.Length - 1;
+		while (num > 0 && input[num] == 0)
+		{
+			num--;
+		}
+		if (input[num] != 128)
+		{
+			throw new InvalidCipherTextException("pad block corrupted");
+		}
+		return input.Length - num;
+	}
+}