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/*
Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file src/asset.cc
* @brief Parent class for assets of DCPs made up of MXF files.
*/
#include "raw_convert.h"
#include "AS_DCP.h"
#include "KM_prng.h"
#include "KM_util.h"
#include "mxf.h"
#include "util.h"
#include "metadata.h"
#include "exceptions.h"
#include "dcp_assert.h"
#include "compose.hpp"
#include <libxml++/nodes/element.h>
#include <boost/filesystem.hpp>
#include <iostream>
using std::string;
using std::cout;
using std::list;
using std::pair;
using boost::shared_ptr;
using boost::dynamic_pointer_cast;
using namespace dcp;
MXF::MXF ()
: _decryption_context (0)
{
}
MXF::~MXF ()
{
delete _decryption_context;
}
void
MXF::fill_writer_info (ASDCP::WriterInfo* writer_info, string id, Standard standard) const
{
writer_info->ProductVersion = _metadata.product_version;
writer_info->CompanyName = _metadata.company_name;
writer_info->ProductName = _metadata.product_name.c_str();
if (standard == INTEROP) {
writer_info->LabelSetType = ASDCP::LS_MXF_INTEROP;
} else {
writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
}
unsigned int c;
Kumu::hex2bin (id.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
DCP_ASSERT (c == Kumu::UUID_Length);
if (_key_id) {
Kumu::GenRandomUUID (writer_info->ContextID);
writer_info->EncryptedEssence = true;
unsigned int c;
Kumu::hex2bin (_key_id.get().c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
DCP_ASSERT (c == Kumu::UUID_Length);
}
}
/** Set the (private) key that will be used to encrypt or decrypt this MXF's content.
* This is the top-secret key that is distributed (itself encrypted) to cinemas
* via Key Delivery Messages (KDMs).
* @param key Key to use.
*/
void
MXF::set_key (Key key)
{
_key = key;
if (!_key_id) {
/* No key ID so far; we now need one */
_key_id = make_uuid ();
}
_decryption_context = new ASDCP::AESDecContext;
if (ASDCP_FAILURE (_decryption_context->InitKey (_key->value ()))) {
throw MiscError ("could not set up decryption context");
}
}
string
MXF::read_writer_info (ASDCP::WriterInfo const & info)
{
char buffer[64];
if (info.EncryptedEssence) {
Kumu::bin2UUIDhex (info.CryptographicKeyID, ASDCP::UUIDlen, buffer, sizeof (buffer));
_key_id = buffer;
}
_metadata.read (info);
Kumu::bin2UUIDhex (info.AssetUUID, ASDCP::UUIDlen, buffer, sizeof (buffer));
return buffer;
}
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