[Webkit-unassigned] [Bug 137321] New: [EME] Improvements to the secure proof of key release protocol

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=137321

           Summary: [EME] Improvements to the secure proof of key release
                    protocol
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jer.noble at apple.com


After conversations with clients, change the informal protocol used to generate SPoKR messages to the following:

  session = keys.createSession('mime', initData);
  ...
  session.close()

This will result in a new keymessage, the contents of which is the SPoKR blob for that session.

The client will acknowledge receipt of the blob by calling:

  session.update('acknowledge');

This will remove the session from the persistent store.

Additionally, outside of an existing storage, a client can ask for all outstanding SPoKR entries by creating a session like the following:

  session = keys.createSession('keyrelease', certData);

This will result in a new keymessage, the contents of the first SPoKR blob in the persistent store.

The client will acknowledge receipt of the blob by calling:

  session.update('acknowledge');

This will remove the session from the persistent store.

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