//
// System.Security.Cryptography ICryptoTransform interface
//
// Authors:
//   Matthew S. Ford (Matthew.S.Ford@Rose-Hulman.Edu)
//
// Copyright 2001 by Matthew S. Ford.
//


using System.Security.Cryptography;

namespace System.Security.Cryptography {

	/// <summary>
	/// Crytographic functions that can process a stream of bytes implement this interface.
	/// This works by stringing together one or more ICryptoTransform classes with a stream.
	/// Data is passed from one to the next without the need of outside buffering/intervention.
	/// </summary>
	public interface ICryptoTransform {
	
		/// <summary>
		/// Whether the function can transform multiple blocks at a time.
		/// </summary>
		bool CanTransformMultipleBlocks {get;}

		/// <summary>
		/// Size of input blocks for the function.
		/// </summary>
		int InputBlockSize {get;}

		/// <summary>
		/// Size of the output blocks of the function.
		/// </summary>
		int OutputBlockSize {get;}

		/// <summary>
		/// FIXME: Process some data.  A block at a time?  Less than a block at a time?
		/// </summary>
		int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset);

		/// <summary>
		/// Processes the final part of the data.  Also finalizes the function if needed.
		/// </summary>
		byte[] TransformFinalBlock (byte[] inputBuffer, int inputOffset, int inputCount);

	}
}