[PATCH] RFC - change GPRS cipher API

[☎]

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
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