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Sylvain Munaut 246tnt at gmail.com> auth.c (line no 45 to 49)..the doubt is hw the looping is done from > 0 to 4 and 8 to 12...can u pls give me any link to clear this doubt... This implements the so called "XOR" sim cards. I don't know of any official specs, it's just how they work as tested on one of those SIMs ... > one > more thing there is a function [comp128(ainfo->a3a8_ki, atuple->rand, > atuple->sres, atuple->kc)] in line no 63..but it is not defined.. It's in libosmocore http://git.osmocom.org/gitweb?p=libosmocore.git;a=blob;f=src/comp128.c;h=5d5680c7227ced10dea604b7e5a2d9da98c01043;hb=43558316bc4e6ddac92dd198b07a4803c21dc77b Sylvain