swaroop: basics of encrypted MP4 playback.

[dcpomatic.git] / src / lib / encrypted_ecinema_kdm.cc

diff --git a/src/lib/encrypted_ecinema_kdm.cc b/src/lib/encrypted_ecinema_kdm.cc
index e277eb997c46602b34e116f6d7ada4b544d21b55..ab9e15e858d8a1bab6851c3620a6b2bff108b780 100644 (file)
--- a/src/lib/encrypted_ecinema_kdm.cc
+++ b/src/lib/encrypted_ecinema_kdm.cc
@@ -23,6 +23,8 @@
 #include "encrypted_ecinema_kdm.h"
 #include <dcp/key.h>
 #include <dcp/certificate.h>
+#include <dcp/util.h>
+#include <libcxml/cxml.h>
 #include <libxml++/libxml++.h>
 #include <openssl/rsa.h>
 #include <iostream>
@@ -32,13 +34,24 @@ using std::string;
 using boost::shared_ptr;
 using dcp::Certificate;
 
-EncryptedECinemaKDM::EncryptedECinemaKDM (dcp::Key content_key, Certificate recipient)
+EncryptedECinemaKDM::EncryptedECinemaKDM (string id, dcp::Key content_key, Certificate recipient)
+       : _id (id)
 {
        RSA* rsa = recipient.public_key ();
        _content_key = dcp::Data (RSA_size(rsa));
        int const N = RSA_public_encrypt (content_key.length(), content_key.value(), _content_key.data().get(), rsa, RSA_PKCS1_OAEP_PADDING);
 }
 
+EncryptedECinemaKDM::EncryptedECinemaKDM (string xml)
+{
+       cxml::Document doc ("ECinemaSecurityMessage");
+       doc.read_string (xml);
+       _id = doc.string_child ("Id");
+       _content_key = dcp::Data (256);
+       int const len = dcp::base64_decode (doc.string_child("Key"), _content_key.data().get(), _content_key.size());
+       _content_key.set_size (len);
+}
+
 string
 EncryptedECinemaKDM::as_xml () const
 {
@@ -57,7 +70,8 @@ EncryptedECinemaKDM::as_xml () const
        }
 
        xmlpp::Document document;
-       xmlpp::Element* root = document.create_root_node ("ECinemaSecurityMesage");
+       xmlpp::Element* root = document.create_root_node ("ECinemaSecurityMessage");
+       root->add_child("Id")->add_child_text(_id);
        root->add_child("Key")->add_child_text(lines);
        return document.write_to_string ("UTF-8");
 }