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CryptoTransform.h

//
// CryptoTransform.h
//
// $Id: //poco/1.3/Crypto/include/Poco/Crypto/CryptoTransform.h#1 $
//
// Library: Crypto
// Package: CryptoCore
// Module:  CryptoTransform
//
// Definition of the CryptoTransform class.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Crypto_CryptoTransform_INCLUDED
#define Crypto_CryptoTransform_INCLUDED


#include "Poco/Crypto/Crypto.h"


namespace Poco {
namespace Crypto {


00050 class Crypto_API CryptoTransform
      /// This interface represents the basic operations for cryptographic
      /// transformations to be used with a CryptoInputStream or a
      /// CryptoOutputStream.
      ///
      /// Implementations of this class are returned by the Cipher class to
      /// perform encryption or decryption of data.
{
public:
      CryptoTransform();
            /// Creates a new CryptoTransform object.

      virtual ~CryptoTransform();
            /// Destroys the CryptoTransform.

      virtual std::size_t blockSize() const = 0;
            /// Returns the block size for this CryptoTransform.

      virtual std::streamsize transform(
            const unsigned char* input,
            std::streamsize          inputLength,
            unsigned char*           output,
            std::streamsize          outputLength) = 0;
            /// Transforms a chunk of data. The inputLength is arbitrary and does not
            /// need to be a multiple of the block size. The output buffer has a maximum
            /// capacity of the given outputLength that must be at least
            ///   inputLength + bufferSize() - 1
            /// Returns the number of bytes written to the output buffer.

      virtual std::streamsize finalize(unsigned char* output, std::streamsize length) = 0;
            /// Finalizes the transformation. The output buffer must contain enough
            /// space for at least one block, ie.
            ///   length >= bufferSize()
            /// must be true.  Returns the number of bytes written to the output
            /// buffer.
};


} } // namespace Poco::Crypto


#endif // Crypto_CryptoTransform_INCLUDED

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