Try to fix comparison of encrypted sound assets.
[libdcp.git] / src / encrypted_kdm.cc
index 7ee28d1afd9356ba78d8c8e59e33863a03b14ceb..8ed0c3159c7ec8c955af77a430c5befdde93c4df 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2016 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
 #include <libxml++/nodes/element.h>
 #include <libxml/parser.h>
 #include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/foreach.hpp>
 
 using std::list;
+using std::vector;
 using std::string;
 using std::map;
 using std::pair;
 using boost::shared_ptr;
+using boost::optional;
 using namespace dcp;
 
 namespace dcp {
@@ -200,9 +203,13 @@ public:
 
                for (list<string>::const_iterator i = encrypted_key.begin(); i != encrypted_key.end(); ++i) {
                        xmlpp::Element* encrypted_key = node->add_child ("EncryptedKey", "enc");
+                       /* XXX: hack for testing with Dolby */
+                       encrypted_key->set_namespace_declaration ("http://www.w3.org/2001/04/xmlenc#", "enc");
                        xmlpp::Element* encryption_method = encrypted_key->add_child ("EncryptionMethod", "enc");
                        encryption_method->set_attribute ("Algorithm", "http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p");
                        xmlpp::Element* digest_method = encryption_method->add_child ("DigestMethod", "ds");
+                       /* XXX: hack for testing with Dolby */
+                       digest_method->set_namespace_declaration ("http://www.w3.org/2000/09/xmldsig#", "ds");
                        digest_method->set_attribute ("Algorithm", "http://www.w3.org/2000/09/xmldsig#sha1");
                        xmlpp::Element* cipher_data = encrypted_key->add_child ("CipherData", "enc");
                        cipher_data->add_child("CipherValue", "enc")->add_child_text (*i);
@@ -219,7 +226,7 @@ public:
 
        TypedKeyId (shared_ptr<const cxml::Node> node)
                : key_type (node->string_child ("KeyType"))
-               , key_id (node->string_child ("KeyId").substr (9))
+               , key_id (remove_urn_uuid (node->string_child ("KeyId")))
        {
 
        }
@@ -231,8 +238,13 @@ public:
 
        void as_xml (xmlpp::Element* node) const
        {
-               node->add_child("KeyType")->add_child_text (key_type);
+               xmlpp::Element* type = node->add_child("KeyType");
+               type->add_child_text (key_type);
                node->add_child("KeyId")->add_child_text ("urn:uuid:" + key_id);
+               /* XXX: this feels like a bit of a hack */
+               if (key_type == "MDEK") {
+                       type->set_attribute ("scope", "http://www.dolby.com/cp850/2012/KDM#kdm-key-type");
+               }
        }
 
        string key_type;
@@ -268,11 +280,12 @@ public:
        AuthorizedDeviceInfo () {}
 
        AuthorizedDeviceInfo (shared_ptr<const cxml::Node> node)
-               : device_list_identifier (node->string_child ("DeviceListIdentifier").substr (9))
+               : device_list_identifier (remove_urn_uuid (node->string_child ("DeviceListIdentifier")))
                , device_list_description (node->optional_string_child ("DeviceListDescription"))
-               , certificate_thumbprint (node->node_child("DeviceList")->string_child ("CertificateThumbprint"))
        {
-
+               BOOST_FOREACH (cxml::ConstNodePtr i, node->node_child("DeviceList")->node_children("CertificateThumbprint")) {
+                       certificate_thumbprints.push_back (i->content ());
+               }
        }
 
        void as_xml (xmlpp::Element* node) const
@@ -282,13 +295,15 @@ public:
                        node->add_child ("DeviceListDescription")->add_child_text (device_list_description.get());
                }
                xmlpp::Element* device_list = node->add_child ("DeviceList");
-               device_list->add_child("CertificateThumbprint")->add_child_text (certificate_thumbprint);
+               BOOST_FOREACH (string i, certificate_thumbprints) {
+                       device_list->add_child("CertificateThumbprint")->add_child_text (i);
+               }
        }
 
        /** DeviceListIdentifier without the urn:uuid: prefix */
        string device_list_identifier;
        boost::optional<string> device_list_description;
-       string certificate_thumbprint;
+       std::list<string> certificate_thumbprints;
 };
 
 class X509IssuerSerial
@@ -342,7 +357,7 @@ public:
 
        KDMRequiredExtensions (shared_ptr<const cxml::Node> node)
                : recipient (node->node_child ("Recipient"))
-               , composition_playlist_id (node->string_child ("CompositionPlaylistId").substr (9))
+               , composition_playlist_id (remove_urn_uuid (node->string_child ("CompositionPlaylistId")))
                , content_title_text (node->string_child ("ContentTitleText"))
                , not_valid_before (node->string_child ("ContentKeysNotValidBefore"))
                , not_valid_after (node->string_child ("ContentKeysNotValidAfter"))
@@ -406,12 +421,14 @@ class AuthenticatedPublic
 public:
        AuthenticatedPublic ()
                : message_id (make_uuid ())
+                 /* XXX: hack for Dolby to see if there must be a not-empty annotation text */
+               , annotation_text ("none")
                , issue_date (LocalTime().as_string ())
        {}
 
        AuthenticatedPublic (shared_ptr<const cxml::Node> node)
-               : message_id (node->string_child ("MessageId").substr (9))
-               , annotation_text (node->string_child ("AnnotationText"))
+               : message_id (remove_urn_uuid (node->string_child ("MessageId")))
+               , annotation_text (node->optional_string_child ("AnnotationText"))
                , issue_date (node->string_child ("IssueDate"))
                , signer (node->node_child ("Signer"))
                , required_extensions (node->node_child ("RequiredExtensions"))
@@ -425,7 +442,9 @@ public:
 
                node->add_child("MessageId")->add_child_text ("urn:uuid:" + message_id);
                node->add_child("MessageType")->add_child_text ("http://www.smpte-ra.org/430-1/2006/KDM#kdm-key-type");
-               node->add_child("AnnotationText")->add_child_text (annotation_text);
+               if (annotation_text) {
+                       node->add_child("AnnotationText")->add_child_text (annotation_text.get ());
+               }
                node->add_child("IssueDate")->add_child_text (issue_date);
 
                signer.as_xml (node->add_child ("Signer"));
@@ -435,7 +454,7 @@ public:
        }
 
        string message_id;
-       string annotation_text;
+       optional<string> annotation_text;
        string issue_date;
        Signer signer;
        RequiredExtensions required_extensions;
@@ -496,6 +515,7 @@ EncryptedKDM::EncryptedKDM (string s)
 EncryptedKDM::EncryptedKDM (
        shared_ptr<const CertificateChain> signer,
        Certificate recipient,
+       vector<Certificate> trusted_devices,
        string device_list_description,
        string cpl_id,
        string content_title_text,
@@ -534,10 +554,17 @@ EncryptedKDM::EncryptedKDM (
 
        if (formulation == MODIFIED_TRANSITIONAL_1 || formulation == DCI_ANY) {
                /* Use the "assume trust" thumbprint */
-               kre.authorized_device_info.certificate_thumbprint = "2jmj7l5rSw0yVb/vlWAYkK/YBwk=";
+               kre.authorized_device_info.certificate_thumbprints.push_back ("2jmj7l5rSw0yVb/vlWAYkK/YBwk=");
        } else if (formulation == DCI_SPECIFIC) {
-               /* Use the recipient thumbprint */
-               kre.authorized_device_info.certificate_thumbprint = recipient.thumbprint ();
+               /* As I read the standard we should use the recipient
+                  /and/ other trusted device thumbprints here.  MJD
+                  reports that this doesn't work with his setup;
+                  a working KDM does not include the recipient's
+                  thumbprint (recipient.thumbprint()).
+               */
+               BOOST_FOREACH (Certificate const & i, trusted_devices) {
+                       kre.authorized_device_info.certificate_thumbprints.push_back (i.thumbprint ());
+               }
        }
 
        for (list<pair<string, string> >::const_iterator i = key_ids.begin(); i != key_ids.end(); ++i) {
@@ -595,11 +622,6 @@ EncryptedKDM::as_xml (boost::filesystem::path path) const
 string
 EncryptedKDM::as_xml () const
 {
-       xmlpp::Document document;
-       xmlpp::Element* root = document.create_root_node ("DCinemaSecurityMessage", "http://www.smpte-ra.org/schemas/430-3/2006/ETM");
-       root->set_namespace_declaration ("http://www.w3.org/2000/09/xmldsig#", "ds");
-       root->set_namespace_declaration ("http://www.w3.org/2001/04/xmlenc#", "enc");
-
        return _data->as_xml()->write_to_string ("UTF-8");
 }
 
@@ -609,7 +631,7 @@ EncryptedKDM::keys () const
        return _data->authenticated_private.encrypted_key;
 }
 
-string
+optional<string>
 EncryptedKDM::annotation_text () const
 {
        return _data->authenticated_public.annotation_text;
@@ -621,6 +643,12 @@ EncryptedKDM::content_title_text () const
        return _data->authenticated_public.required_extensions.kdm_required_extensions.content_title_text;
 }
 
+string
+EncryptedKDM::cpl_id () const
+{
+       return _data->authenticated_public.required_extensions.kdm_required_extensions.composition_playlist_id;
+}
+
 string
 EncryptedKDM::issue_date () const
 {