GDCM 2.2.1

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ExtractEncryptedContent.cxx
/*=========================================================================
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.
=========================================================================*/
#include "gdcmReader.h"
#include <fstream>
/*
openssl smime -encrypt -binary -aes256 -in outputfile.dcm -inform DER -out outputfile.der -outform DER ../trunk/Testing/Source/Data/certificate.pem
openssl smime -decrypt -binary -in out.der -inform DER -out outputfile.dcm -outform DER -inkey ../trunk/Testing/Source/Data/privatekey.pem ../trunk/Testing/Source/Data/certificate.pem
*/
int main(int argc, char *argv[])
{
if( argc < 3 )
{
std::cerr << argv[0] << " input.dcm output.der" << std::endl;
return 1;
}
const char *filename = argv[1];
const char *outfilename = argv[2];
gdcm::Reader reader;
reader.SetFileName( filename );
if( !reader.Read() )
{
return 1;
}
gdcm::File &file = reader.GetFile();
gdcm::DataSet &ds = file.GetDataSet();
const gdcm::DataElement &EncryptedAttributesSequence = ds.GetDataElement( gdcm::Tag( 0x0400,0x0500 ) );
gdcm::SequenceOfItems *sqi = EncryptedAttributesSequence.GetValueAsSQ();
if ( !sqi || sqi->GetNumberOfItems() != 1 ) return 1;
gdcm::Item &item = sqi->GetItem(1);
gdcm::DataSet &nestedds = item.GetNestedDataSet();
if( ! nestedds.FindDataElement( gdcm::Tag( 0x0400,0x0520) ) ) return 1;
const gdcm::DataElement &EncryptedContent = nestedds.GetDataElement( gdcm::Tag( 0x0400,0x0520) );
const gdcm::ByteValue *bv = EncryptedContent.GetByteValue();
std::ofstream of( outfilename );
of.write( bv->GetPointer(), bv->GetLength() );
of.close();
return 0;
}