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Created by Jurre van Bergen@DrWhaxOwner5 of 5 tasks completed5/5 tasks

Check how an encrypted message is attached to the Non-Interactive-Auth message

Created by: claucece

Why

As we are currently implementing the revision number 2 of the OTRv4 specification, we need to include a consistent way of attaching an encrypted message to the Non-Interactive-Auth message.

Reference

Please, refer to the "Attaching an Encrypted Message to Non-Interactive-Auth Message in XZDH" section of the OTRv4 spec.

Tasks

  • Correctly attach the message to the Non-Interactive-Auth message.
  • Correctly initialize the double ratchet algorithm for this case.
  • Correctly derive the double ratchet algorithm keys.
  • Correctly encrypt and decrypt the message.
  • Check that the Non-Interactive-Auth message correctly works.

Open questions

None.