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WildcardTicket
The wildcard ticket is used for activating the baseband. It is stored in the file "/var/root/Library/Lockdown/activation_records/wildcard_record.plist". When activating an iPhone, the ticket is pulled from Apple's server and stored on the device. It contains all the information about sim-/netlocks. Factory- and carrier-unlocked devices receive a wildcard ticket with policies that permit all SIM cards.
Contents
Ticket Layout
0x0 Version number (=2 for iPhone 3G, 3GS) 0x4 Encrypted Ticket
The ticket is decrypted with TEA in CBC mode using a key hashed from the NORID, CHIPID, IMEI and a salt. The layout of the decrypted ticket looks like this:
0x000 Certificate Length (in bits) 0x004 Certificate Serial (usually 1) 0x008 Public Key Length (in bits) 0x00c Public Key Exponent 0x010-0x090 Public Key (RSA Key 3) 0x090-0x110 Additional Public Key - not in use 0x110-0x190 Certificate of the first 0x110 bytes signed with rsa_key2 0x190-0x19B ICCID mask (relevant bits for simlock) 0x19C-0x1A3 IMEI 0x1A4-0x1B7 Hash of several hardware IDs (IMEI, NORID, CHIPID) 0x1B8-... Table of "policies" (netlock)
Attached to the decrypted ticket is a certificate (0x80 byte) signed with the RSA key 3 at 0x010.
Policy Table Layout
0x0 Total length of the policy table in bytes <Policy Item>
An item is 12 byte in size and has this structure:
0x0-0x2 ID 0x2-0x4 type? 0x4-0xC IMSI mask
Each nibble of a mask corresponds to a number - the wildcard is encoded as 0xE.
AT&T USA
IMSI Mask 310150????????? 310170????????? 310410????????? 311180????????? 310980?????????
This is an iPhone 3GS from AT&T.
T-Mobile Germany
IMSI Mask 26201?????????? 26201?????????? 26201??????????
This is an iPhone 3G from T-Mobile Germany.
Factory Unlocked Device
IMSI Mask ???????????????
Obligatory.