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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace Org.BouncyCastle.Crypto
{
/// <summary>
/// Base interface for a ciphers that do not require data to be block aligned.
/// <para>
/// Note: In cases where the underlying algorithm is block based, these ciphers may add or remove padding as needed.
/// </para>
/// </summary>
public interface ICipher
{
/// <summary>
/// Return the size of the output buffer required for a Write() plus a
/// close() with the write() being passed inputLen bytes.
/// <para>
/// The returned size may be dependent on the initialisation of this cipher
/// and may not be accurate once subsequent input data is processed as the cipher may
/// add, add or remove padding, as it sees fit.
/// </para>
/// </summary>
/// <returns>The space required to accommodate a call to processBytes and doFinal with inputLen bytes of input.</returns>
/// <param name="inputLen">The length of the expected input.</param>
int GetMaxOutputSize(int inputLen);
/// <summary>
/// Return the size of the output buffer required for a write() with the write() being
/// passed inputLen bytes and just updating the cipher output.
/// </summary>
/// <returns>The space required to accommodate a call to processBytes with inputLen bytes of input.</returns>
/// <param name="inputLen">The length of the expected input.</param>
int GetUpdateOutputSize(int inputLen);
/// <summary>
/// Gets the stream for reading/writing data processed/to be processed.
/// </summary>
/// <value>The stream associated with this cipher.</value>
Stream Stream { get; }
}
}
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