using System;
namespace Org.BouncyCastle.Crypto{
/// <summary>The interface stream ciphers conform to.</summary>
public interface IStreamCipher
{
/// <summary>The name of the algorithm this cipher implements.</summary>
string AlgorithmName { get; }
/// <summary>Initialise the cipher.</summary>
/// <param name="forEncryption">If true the cipher is initialised for encryption,
/// if false for decryption.</param>
/// <param name="parameters">The key and other data required by the cipher.</param>
/// <exception cref="ArgumentException">
/// If the parameters argument is inappropriate.
/// </exception>
void Init(bool forEncryption, ICipherParameters parameters);
/// <summary>encrypt/decrypt a single byte returning the result.</summary>
/// <param name="input">the byte to be processed.</param>
/// <returns>the result of processing the input byte.</returns>
byte ReturnByte(byte input);
/// <summary>
/// Process a block of bytes from <c>input</c> putting the result into <c>output</c>.
/// </summary>
/// <param name="input">The input byte array.</param>
/// <param name="inOff">
/// The offset into <c>input</c> where the data to be processed starts.
/// </param>
/// <param name="length">The number of bytes to be processed.</param>
/// <param name="output">The output buffer the processed bytes go into.</param>
/// <param name="outOff">
/// The offset into <c>output</c> the processed data starts at.
/// </param>
/// <exception cref="DataLengthException">If the output buffer is too small.</exception>
void ProcessBytes(byte[] input, int inOff, int length, byte[] output, int outOff);
/// <summary>
/// Reset the cipher to the same state as it was after the last init (if there was one).
/// </summary>
void Reset();
}
}
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