[PATCH] RFC - change GPRS cipher API

This is merely a historical archive of years 2008-2021, before the migration to mailman3.

A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/baseband-devel@lists.osmocom.org/.

Max.Suraev at fairwaves.ru
Wed Nov 27 16:33:58 UTC 2013


Hello.

Attached is a trivial patch which breaks existing GPRS cipher API of libosmocore by
switching from fixed 64-bit length Kc to variable-length.

There are several justifications for that:

- compliance with ETSI TS 155.22 (GEA4 - 128 bits Kc) and all further versions
- similarity to existing auth api (osmocom/crypt/auth.h uses 128 bits as well)
- nobody uses this API anyway (except my other patches with GEA)
- patch breaks nothing within libosmocore (make check succeeds) and openbsc (uses
gea0 only)

That's why I think next libosmocore version should apply this patch and change unused
API before someone actually start using it and makes transition more difficult.

-- 
best regards,
Max, http://fairwaves.ru


More information about the baseband-devel mailing list