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/*=========================================================================

  Program: GDCM (Grassroots DICOM). A DICOM library

  Copyright (c) 2006-2011 Mathieu Malaterre
  All rights reserved.
  See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef GDCMOPENSSLP7CRYPTOGRAPHICMESSAGESYNTAX_H
#define GDCMOPENSSLP7CRYPTOGRAPHICMESSAGESYNTAX_H

#include "gdcmCryptographicMessageSyntax.h"
#include "gdcmTypes.h"

namespace gdcm
{
class CryptographicMessageSyntaxInternals;
//-----------------------------------------------------------------------------

/**
 * \brief
 * \details Class for CryptographicMessageSyntax encryption. This is just a simple
 * wrapper around openssl PKCS7_encrypt functionalities
 *
 * See online documentation
 * http://www.openssl.org/docs/crypto/PKCS7_encrypt.html
 *
 */
class GDCM_EXPORT OpenSSLP7CryptographicMessageSyntax : public CryptographicMessageSyntax
{
public:
  OpenSSLP7CryptographicMessageSyntax();
  ~OpenSSLP7CryptographicMessageSyntax();
  
    // X.509
  bool ParseCertificateFile( const char *filename );
  bool ParseKeyFile( const char *filename );

  // PBE
  bool SetPassword(const char * /*pass*/, size_t /*passLen*/)
  {
    gdcmWarningMacro( "Openssl using PKCS7 does not support Password Based Encryption." );
    return false;
  }

  /// Set Cipher Type.
  /// Default is: AES256_CIPHER
  void SetCipherType(CipherTypes type);
  CipherTypes GetCipherType() const;

  /// create a PKCS#7 envelopedData structure
  bool Encrypt(char *output, size_t &outlen, const char *array, size_t len) const;

  /// decrypt content from a PKCS#7 envelopedData structure
  bool Decrypt(char *output, size_t &outlen, const char *array, size_t len) const;

private:
  CryptographicMessageSyntaxInternals *Internals;
private:
  OpenSSLP7CryptographicMessageSyntax(const OpenSSLP7CryptographicMessageSyntax&);  // Not implemented.
  void operator=(const OpenSSLP7CryptographicMessageSyntax&);  // Not implemented.
};
} // end namespace gdcm
//-----------------------------------------------------------------------------
#endif //GDCMOPENSSLP7CRYPTOGRAPHICMESSAGESYNTAX_H