2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/asset.cc
21 * @brief Parent class for assets of DCPs made up of MXF files.
24 #include "raw_convert.h"
31 #include "exceptions.h"
32 #include "dcp_assert.h"
33 #include "compose.hpp"
34 #include <libxml++/nodes/element.h>
35 #include <boost/filesystem.hpp>
42 using boost::shared_ptr;
43 using boost::dynamic_pointer_cast;
47 : _decryption_context (0)
54 delete _decryption_context;
58 MXF::fill_writer_info (ASDCP::WriterInfo* writer_info, string id, Standard standard) const
60 writer_info->ProductVersion = _metadata.product_version;
61 writer_info->CompanyName = _metadata.company_name;
62 writer_info->ProductName = _metadata.product_name.c_str();
64 if (standard == INTEROP) {
65 writer_info->LabelSetType = ASDCP::LS_MXF_INTEROP;
67 writer_info->LabelSetType = ASDCP::LS_MXF_SMPTE;
70 Kumu::hex2bin (id.c_str(), writer_info->AssetUUID, Kumu::UUID_Length, &c);
71 DCP_ASSERT (c == Kumu::UUID_Length);
74 Kumu::GenRandomUUID (writer_info->ContextID);
75 writer_info->EncryptedEssence = true;
78 Kumu::hex2bin (_key_id.get().c_str(), writer_info->CryptographicKeyID, Kumu::UUID_Length, &c);
79 DCP_ASSERT (c == Kumu::UUID_Length);
83 /** Set the (private) key that will be used to encrypt or decrypt this MXF's content.
84 * This is the top-secret key that is distributed (itself encrypted) to cinemas
85 * via Key Delivery Messages (KDMs).
86 * @param key Key to use.
89 MXF::set_key (Key key)
94 /* No key ID so far; we now need one */
95 _key_id = make_uuid ();
98 _decryption_context = new ASDCP::AESDecContext;
99 if (ASDCP_FAILURE (_decryption_context->InitKey (_key->value ()))) {
100 throw MiscError ("could not set up decryption context");
105 MXF::read_writer_info (ASDCP::WriterInfo const & info)
109 if (info.EncryptedEssence) {
110 Kumu::bin2UUIDhex (info.CryptographicKeyID, ASDCP::UUIDlen, buffer, sizeof (buffer));
114 _metadata.read (info);
116 Kumu::bin2UUIDhex (info.AssetUUID, ASDCP::UUIDlen, buffer, sizeof (buffer));