Add AiMe card checksum - [opened]

[icex2]

In GitLab by @ilufang on Jul 13, 2022, 07:41

Merges mifare-dev -> master

Here is the algorithm for that three bytes at the end of block 1 for a mifare AiMe, so that you can type your access code in aime.txt and use it in chunithm old. It is of hardly any practical value for the majority of use cases, but hey it's missing piece to the tool!

Limitations (due to how the cards and games are):

• You have to provide a 0103-prefixed access code from an actual mifare-based aime card in aime.txt. The tool will fill in block 1 and aimeReaderHost will be happy.
• If you make up an access code (even just one digit different from a legit one), block 1 will be computed but aimeReaderHost can identify the access code as invalid and reject with 6405.
• If you enter a banapass access code, since it has completely different mifare block format, this code will do nothing, and new code are required to encode the blocks.
• If you enter a AmusementIC access code, this does nothing for you because aimeReaderHost likely accepts unknown prefixes without any verification.
• If you are running an amdaemon-based game, this does nothing for you because amdaemon likely accepts whatever number without any verification.
• It is not advisable to use this to make a physical card for use on cabs connected to SEGA, because it is still missing fields like UID and title code.

The algorithm itself is very nasty and does not seem used anywhere else.

[icex2]

In GitLab by @ilufang on Jul 13, 2022, 07:41

added 3 commits

• e8951d71...fd0f6e23 - 2 commits from branch djhackers:master
• 5f11e1e - iccard/aime.c: Add aime checksum to mifare cards

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