This feature was not used by the cards I initially used when coding the
, but is required for (at least some) Mifare DESFire EV1 to work.
IMPORTANT NOTE: The cards needing this block-number management to work out
break-down when mifare_desfire_format_picc() is performed on them. The ATR
change from 0x7577810280 to 0x757781028f and further communication alway result
in a timeout. At the time of committing, the reason is still unknown (bogus
cards, missed "Remarks" in the documentation, ...). Other commands seems to
not expose additional problems.
After trying to tweak gindent so that it does not mess-up my ASCII art, give
and read the help of Vim to setup 'cinoptions' according to my needs
(cino=t0(0). This changeset reindent some bits that where not indented as they
should. A future commit will reindent the switch/case according to my (bad)
taste now that I have setup cindent correctly on my system (cino=t0(0:0).
nfc_initiator_transceive_dep_bytes() was removed, and
nfc_initiator_transceive_bytes() is now configured to behave like the one or
the other of the original functions. For details, see:
http://code.google.com/p/libnfc/source/detail?r=592
For the regression test-suite test_mifare_desfire, it's a ~11% performance
boost, with 206 cache hits out of 488 calls to
mifare_desfire_get_file_settings().
The check is already done by the PICC and we may not have access to the
required information to do the check from the library. Additionally, the
mifare_desfire_change_key() would require different keys to operate if we
detected an error, so no recovery of any kind is possible.
Instead of uting nfc_initiator_transceive_dep_bytes() to transmit commands,
prepend an ISO-14443-4 header to it and send it using
nfc_initiator_transceive_bytes(). In case of WTX reply, handle it, and then
extract relevant information from the data returned by the PICC.
This prevents failure that happen with ISO-14443-4 compliant targets when using
a PN531-based NFC-device, and allows using the libfreefare with Mifare DESFire
targets on such devices.
Not a hack this time:
- Use the hexdump(3) function of the system if it exists;
- Build the subpart of FreeBSD's libutil if not (contrib);
- Do this only if configured --with-debug.
The Mifare Classic / Ultralight code will be eventually changed to also provide this functionality.
