init commit

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

@@ -0,0 +1,98 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto;
+
+public class BufferedAsymmetricBlockCipher : BufferedCipherBase
+{
+	private readonly IAsymmetricBlockCipher cipher;
+
+	private byte[] buffer;
+
+	private int bufOff;
+
+	public override string AlgorithmName => cipher.AlgorithmName;
+
+	public BufferedAsymmetricBlockCipher(IAsymmetricBlockCipher cipher)
+	{
+		this.cipher = cipher;
+	}
+
+	internal int GetBufferPosition()
+	{
+		return bufOff;
+	}
+
+	public override int GetBlockSize()
+	{
+		return cipher.GetInputBlockSize();
+	}
+
+	public override int GetOutputSize(int length)
+	{
+		return cipher.GetOutputBlockSize();
+	}
+
+	public override int GetUpdateOutputSize(int length)
+	{
+		return 0;
+	}
+
+	public override void Init(bool forEncryption, ICipherParameters parameters)
+	{
+		Reset();
+		cipher.Init(forEncryption, parameters);
+		buffer = new byte[cipher.GetInputBlockSize() + (forEncryption ? 1 : 0)];
+		bufOff = 0;
+	}
+
+	public override byte[] ProcessByte(byte input)
+	{
+		if (bufOff >= buffer.Length)
+		{
+			throw new DataLengthException("attempt to process message to long for cipher");
+		}
+		buffer[bufOff++] = input;
+		return null;
+	}
+
+	public override byte[] ProcessBytes(byte[] input, int inOff, int length)
+	{
+		if (length < 1)
+		{
+			return null;
+		}
+		if (input == null)
+		{
+			throw new ArgumentNullException("input");
+		}
+		if (bufOff + length > buffer.Length)
+		{
+			throw new DataLengthException("attempt to process message to long for cipher");
+		}
+		Array.Copy(input, inOff, buffer, bufOff, length);
+		bufOff += length;
+		return null;
+	}
+
+	public override byte[] DoFinal()
+	{
+		byte[] result = ((bufOff > 0) ? cipher.ProcessBlock(buffer, 0, bufOff) : BufferedCipherBase.EmptyBuffer);
+		Reset();
+		return result;
+	}
+
+	public override byte[] DoFinal(byte[] input, int inOff, int length)
+	{
+		ProcessBytes(input, inOff, length);
+		return DoFinal();
+	}
+
+	public override void Reset()
+	{
+		if (buffer != null)
+		{
+			Array.Clear(buffer, 0, buffer.Length);
+			bufOff = 0;
+		}
+	}
+}