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Cipher.cpp
//
// Cipher.cpp
//
// $Id: //poco/1.4/Crypto/src/Cipher.cpp#2 $
//
// Library: Crypto
// Package: Cipher
// Module:  Cipher
//
// 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.
//


#include "Poco/Crypto/Cipher.h"
#include "Poco/Crypto/CryptoStream.h"
#include "Poco/Crypto/CryptoTransform.h"
#include "Poco/Base64Encoder.h"
#include "Poco/Base64Decoder.h"
#include "Poco/HexBinaryEncoder.h"
#include "Poco/HexBinaryDecoder.h"
#include "Poco/StreamCopier.h"
#include "Poco/Exception.h"
#include <sstream>
#include <memory>


namespace Poco {
namespace Crypto {


00054 Cipher::Cipher()
{
}


Cipher::~Cipher()
{
}


00064 std::string Cipher::encryptString(const std::string& str, Encoding encoding)
{
      std::istringstream source(str);
      std::ostringstream sink;

      encrypt(source, sink, encoding);

      return sink.str();
}


00075 std::string Cipher::decryptString(const std::string& str, Encoding encoding)
{
      std::istringstream source(str);
      std::ostringstream sink;

      decrypt(source, sink, encoding);
      return sink.str();
}


00085 void Cipher::encrypt(std::istream& source, std::ostream& sink, Encoding encoding)
{
      CryptoInputStream encryptor(source, createEncryptor());

      switch (encoding)
      {
      case ENC_NONE:
            StreamCopier::copyStream(encryptor, sink);
            break;

      case ENC_BASE64:
      case ENC_BASE64_NO_LF:
            {
                  Poco::Base64Encoder encoder(sink);
                  if (encoding == ENC_BASE64_NO_LF)
                  {
                        encoder.rdbuf()->setLineLength(0);
                  }
                  StreamCopier::copyStream(encryptor, encoder);
                  encoder.close();
            }
            break;

      case ENC_BINHEX:
      case ENC_BINHEX_NO_LF:
            {
                  Poco::HexBinaryEncoder encoder(sink);
                  if (encoding == ENC_BINHEX_NO_LF)
                  {
                        encoder.rdbuf()->setLineLength(0);
                  }
                  StreamCopier::copyStream(encryptor, encoder);
                  encoder.close();
            }
            break;

      default:
            throw Poco::InvalidArgumentException("Invalid argument", "encoding");
      }
}


00127 void Cipher::decrypt(std::istream& source, std::ostream& sink, Encoding encoding)
{
      CryptoOutputStream decryptor(sink, createDecryptor());

      switch (encoding)
      {
      case ENC_NONE:
            StreamCopier::copyStream(source, decryptor);
            decryptor.close();
            break;

      case ENC_BASE64:
      case ENC_BASE64_NO_LF:
            {
                  Poco::Base64Decoder decoder(source);
                  StreamCopier::copyStream(decoder, decryptor);
                  decryptor.close();
            }
            break;

      case ENC_BINHEX:
      case ENC_BINHEX_NO_LF:
            {
                  Poco::HexBinaryDecoder decoder(source);
                  StreamCopier::copyStream(decoder, decryptor);
                  decryptor.close();
            }
            break;

      default:
            throw Poco::InvalidArgumentException("Invalid argument", "encoding");
      }
}


} } // namespace Poco::Crypto

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