init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/StreamBlockCipher.cs

@@ -0,0 +1,54 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto;
+
+public class StreamBlockCipher : IStreamCipher
+{
+	private readonly IBlockCipher cipher;
+
+	private readonly byte[] oneByte = new byte[1];
+
+	public string AlgorithmName => cipher.AlgorithmName;
+
+	public StreamBlockCipher(IBlockCipher cipher)
+	{
+		if (cipher == null)
+		{
+			throw new ArgumentNullException("cipher");
+		}
+		if (cipher.GetBlockSize() != 1)
+		{
+			throw new ArgumentException("block cipher block size != 1.", "cipher");
+		}
+		this.cipher = cipher;
+	}
+
+	public void Init(bool forEncryption, ICipherParameters parameters)
+	{
+		cipher.Init(forEncryption, parameters);
+	}
+
+	public byte ReturnByte(byte input)
+	{
+		oneByte[0] = input;
+		cipher.ProcessBlock(oneByte, 0, oneByte, 0);
+		return oneByte[0];
+	}
+
+	public void ProcessBytes(byte[] input, int inOff, int length, byte[] output, int outOff)
+	{
+		if (outOff + length > output.Length)
+		{
+			throw new DataLengthException("output buffer too small in ProcessBytes()");
+		}
+		for (int i = 0; i != length; i++)
+		{
+			cipher.ProcessBlock(input, inOff + i, output, outOff + i);
+		}
+	}
+
+	public void Reset()
+	{
+		cipher.Reset();
+	}
+}