Initial Commit

iTechSharp/srcbc/crypto/BufferedIesCipher.cs

@@ -0,0 +1,113 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Crypto.Engines;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto
+{
+	public class BufferedIesCipher
+		: BufferedCipherBase
+	{
+		private readonly IesEngine engine;
+		private bool forEncryption;
+		private MemoryStream buffer = new MemoryStream();
+
+		public BufferedIesCipher(
+			IesEngine engine)
+		{
+			if (engine == null)
+				throw new ArgumentNullException("engine");
+
+			this.engine = engine;
+		}
+
+		public override string AlgorithmName
+		{
+			// TODO Create IESEngine.AlgorithmName
+			get { return "IES"; }
+		}
+
+		public override void Init(
+			bool				forEncryption,
+			ICipherParameters	parameters)
+		{
+			this.forEncryption = forEncryption;
+
+			// TODO
+			throw Platform.CreateNotImplementedException("IES");
+		}
+
+		public override int GetBlockSize()
+		{
+			return 0;
+		}
+
+		public override int GetOutputSize(
+			int inputLen)
+		{
+			if (engine == null)
+				throw new InvalidOperationException("cipher not initialised");
+
+			int baseLen = inputLen + (int) buffer.Length;
+			return forEncryption
+				?	baseLen + 20
+				:	baseLen - 20;
+		}
+
+		public override int GetUpdateOutputSize(
+			int inputLen)
+		{
+			return 0;
+		}
+
+		public override byte[] ProcessByte(
+			byte input)
+		{
+			buffer.WriteByte(input);
+			return null;
+		}
+
+		public override byte[] ProcessBytes(
+			byte[]	input,
+			int		inOff,
+			int		length)
+		{
+			if (input == null)
+				throw new ArgumentNullException("input");
+			if (inOff < 0)
+				throw new ArgumentException("inOff");
+			if (length < 0)
+				throw new ArgumentException("length");
+			if (inOff + length > input.Length)
+				throw new ArgumentException("invalid offset/length specified for input array");
+
+			buffer.Write(input, inOff, length);
+			return null;
+		}
+
+		public override byte[] DoFinal()
+		{
+			byte[] buf = buffer.ToArray();
+
+			Reset();
+
+			return engine.ProcessBlock(buf, 0, buf.Length);
+		}
+
+		public override byte[] DoFinal(
+			byte[]	input,
+			int		inOff,
+			int		length)
+		{
+			ProcessBytes(input, inOff, length);
+			return DoFinal();
+		}
+
+		public override void Reset()
+		{
+			buffer.SetLength(0);
+		}
+	}
+}