MFOC doesn't write into the output file and recovers no keys

[adrianbrink]

I am running mfoc on Mac OS X, installed with Homebrew.

ffff-MacBook-Pro:~ ffff$ mfoc -k ffffeeeedddd -O mycard.mfd The custom key 0xffffeeeedddd has been added to the default keys ISO/IEC 14443A (106 kbps) target: ATQA (SENS_RES): ff ff

• UID size: single
• bit frame anticollision supported UID (NFCID1): ff ff ff ff
  SAK (SEL_RES): ff
• Compliant with ISO/IEC 14443-4
• Not compliant with ISO/IEC 18092 ATS: ff ff ff ff ff ff ff ff ff ff
• Max Frame Size accepted by PICC: 256 bytes
• Bit Rate Capability:
  • Same bitrate in both directions mandatory
• Frame Waiting Time: 77.33 ms
• Start-up Frame Guard Time: 1.208 ms
• Node Address not supported
• Card IDentifier not supported
• Historical bytes Tk: 44 49 20 30 32 56
  • Proprietary format

Fingerprinting based on MIFARE type Identification Procedure:

• SmartMX with MIFARE 1K emulation Other possible matches based on ATQA & SAK values:
• JCOP31 v2.3.1

Try to authenticate to all sectors with default keys... Symbols: '.' no key found, '/' A key found, '\' B key found, 'x' both keys found [Key: ffffeeeedddd] -> [xxxxxxxxxxxxxxxx] [Key: ffffffffffff] -> [xxxxxxxxxxxxxxxx] [Key: a0a1a2a3a4a5] -> [xxxxxxxxxxxxxxxx] [Key: d3f7d3f7d3f7] -> [xxxxxxxxxxxxxxxx] [Key: 000000000000] -> [xxxxxxxxxxxxxxxx] [Key: b0b1b2b3b4b5] -> [xxxxxxxxxxxxxxxx] [Key: 4d3a99c351dd] -> [xxxxxxxxxxxxxxxx] [Key: 1a982c7e459a] -> [xxxxxxxxxxxxxxxx] [Key: aabbccddeeff] -> [xxxxxxxxxxxxxxxx] [Key: 714c5c886e97] -> [xxxxxxxxxxxxxxxx] [Key: 587ee5f9350f] -> [xxxxxxxxxxxxxxxx] [Key: a0478cc39091] -> [xxxxxxxxxxxxxxxx] [Key: 533cb6c723f6] -> [xxxxxxxxxxxxxxxx] [Key: 8fd0a4f256e9] -> [xxxxxxxxxxxxxxxx]

Sector 00 - FOUND_KEY [A] Sector 00 - FOUND_KEY [B]
Sector 01 - FOUND_KEY [A] Sector 01 - FOUND_KEY [B]
Sector 02 - FOUND_KEY [A] Sector 02 - FOUND_KEY [B]
Sector 03 - FOUND_KEY [A] Sector 03 - FOUND_KEY [B]
Sector 04 - FOUND_KEY [A] Sector 04 - FOUND_KEY [B]
Sector 05 - FOUND_KEY [A] Sector 05 - FOUND_KEY [B]
Sector 06 - FOUND_KEY [A] Sector 06 - FOUND_KEY [B]
Sector 07 - FOUND_KEY [A] Sector 07 - FOUND_KEY [B]
Sector 08 - FOUND_KEY [A] Sector 08 - FOUND_KEY [B]
Sector 09 - FOUND_KEY [A] Sector 09 - FOUND_KEY [B]
Sector 10 - FOUND_KEY [A] Sector 10 - FOUND_KEY [B]
Sector 11 - FOUND_KEY [A] Sector 11 - FOUND_KEY [B]
Sector 12 - FOUND_KEY [A] Sector 12 - FOUND_KEY [B]
Sector 13 - FOUND_KEY [A] Sector 13 - FOUND_KEY [B]
Sector 14 - FOUND_KEY [A] Sector 14 - FOUND_KEY [B]
Sector 15 - FOUND_KEY [A] Sector 15 - FOUND_KEY [B]

We have all sectors encrypted with the default keys..

Auth with all sectors succeeded, dumping keys to a file! nfc_initiator_mifare_cmd: Success

And this is the output. I get that after about 5 seconds of touching the card. However the output file is empty. I have manually installed mfoc and used this fix (http://www.george-smart.co.uk/wiki/NFC_Experiments). Here the output file got written, however it was mainly just 0000.

What could be the problem?

[YeLincoln]

ATQA should never be " ff ff " ,so I guess something wrong with your libnfc instead of mfoc.

[adrianbrink]

That's fine, I changed it, it was a normal value beforehand. :-)

YeLincoln wrote:

ATQA should never be " ff ff " ,so I guess something wrong with your libnfc instead of mfoc.

— Reply to this email directly or view it on GitHub https://github.com/nfc-tools/mfoc/issues/22#issuecomment-106992807.