init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Engines/NullEngine.cs

@@ -0,0 +1,43 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Engines;
+
+public class NullEngine : IBlockCipher
+{
+	private const int BlockSize = 1;
+
+	private bool initialised;
+
+	public virtual string AlgorithmName => "Null";
+
+	public virtual bool IsPartialBlockOkay => true;
+
+	public virtual void Init(bool forEncryption, ICipherParameters parameters)
+	{
+		initialised = true;
+	}
+
+	public virtual int GetBlockSize()
+	{
+		return 1;
+	}
+
+	public virtual int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff)
+	{
+		if (!initialised)
+		{
+			throw new InvalidOperationException("Null engine not initialised");
+		}
+		Check.DataLength(input, inOff, 1, "input buffer too short");
+		Check.OutputLength(output, outOff, 1, "output buffer too short");
+		for (int i = 0; i < 1; i++)
+		{
+			output[outOff + i] = input[inOff + i];
+		}
+		return 1;
+	}
+
+	public virtual void Reset()
+	{
+	}
+}