imsi - just a string
challenge - 16-byte value in hex.
- kc - 4-byte value in hex, the client key (Kc)
- sres - 8-byte value in hex, the secure response
+ sres - 4-byte value in hex, the secure response
+ kc - 8-byte value in hex, the client key (Kc)
Note that EAP-SIM requires *three* sets of triplets, so there must be
three challenges found in the file. The first three challenges are used.