[Standards] XEP-0384 and inbox/omemo-filetransfer: Variable length of MAC

Daniel Gultsch daniel at gultsch.de
Sun Dec 11 18:45:47 UTC 2016


Omemo filetransfer has been rejected by Council due to a retraction by the
author. (me)

The file transfer xep hasn't been updated after that particular change was
made in the omemo xep.

On Dec 11, 2016 7:07 PM, "Andrey Gursky" <andrey.gursky at e-mail.ua> wrote:

> Hi,
>
> > The 16 bytes key and the GCM authentication tag (The tag SHOULD have at
> > least 128 bit) are concatenated and for each intended recipient
> > device...
>
> Once received due to the predefined length of the first field (key),
> the length of the tag can be calculated. Considering OMEMO
> file-transfer: the tag is appended at the end of the encrypted file and
> the total length is reported to the receiver. It seems to me not
> possible to derive the used authentication tag length in this case.
>
> Thanks,
> Andrey
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