[PATCH] Add A5 and GEA ciphers
Max.Suraev at fairwaves.ru
Mon Apr 8 14:20:19 UTC 2013
Thank you for review, comments are inline, rewrite in progress :)
08.04.2013 14:55, Harald Welte пишет:
> I'm also not sure if the gea3/gea4 should become part of libosmogsm
> itself, or if they should simply exist in the form of a
> libosmo-crypt-gea34 or the like. Actually, I once created such a
> library (plugging into gprs_cipher_register()) using the reference
> implementation of the cipher. I'm not 100% sure on this, though. Does
> anyone have an opinion on this?
I think that they should because they are based on exactly the same kgcore primitive
used by a5/3,4.
Also I've tried to add register call (see gprs_gea.c) but when I call
gprs_cipher_supported(GPRS_ALGO_GEA3) in gea_test.c it returns 0. How can I test that
gea3 registered properly and is available via plugin interface?
Also, how should we change gprs_auth plugin api so it would work for 128 bit keys
(GEA4)? Just change uint64_t to uint8_t or there's more to it?
> Even if it gea3/gea4 becomes part of libosmogsm, then I would like to
> have no direct functions exported to applications, but require
> applications to go through the gprs_cipher_* API. The same holds true
> for the A5/* family. Rather than having explicit function calls for
> each of the variants, I would love to have one set of functions with
> just a parameter or struct member defining the specific algorithm to be
> used by the implementation.
I completely agree about hiding implementation of particular algorithms although I
think that gea* belongs in libosmogsm - just like milenage and comp128 which re also
supposed to be used via plugin api.
Is it enough to just remove function names from libosmogsm.map or there got to be
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