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simplify BCC code

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This commit is contained in:
Hanno Heinrichs 2017-09-17 21:33:23 +02:00
parent e21e9c6410
commit 96eb707dd0
1 changed files with 4 additions and 2 deletions
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6
utils/nfc-mfclassic.c
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@ -463,9 +463,11 @@ write_card(bool write_unlocked)
memcpy(mp.mpd.abtData, mtDump.amb[uiBlock].mbd.abtData, sizeof(mp.mpd.abtData));
// do not write a block 0 with incorrect BCC - card will be made invalid!
if (uiBlock == 0) {
if ((mp.mpd.abtData[0] ^ mp.mpd.abtData[1] ^ mp.mpd.abtData[2] ^ mp.mpd.abtData[3] ^ mp.mpd.abtData[4]) != 0x00 && !magic_type2a) {
uint8_t computed_bcc = mp.mpd.abtData[0] ^ mp.mpd.abtData[1] ^ mp.mpd.abtData[2] ^ mp.mpd.abtData[3];
// magic_type2a cards seem to be fine with faulty BCC
if ((computed_bcc != mp.mpd.abtData[4]) && !magic_type2a) {
printf("!\nError: incorrect BCC in MFD file!\n");
printf("Expecting BCC=%02X\n", mp.mpd.abtData[0] ^ mp.mpd.abtData[1] ^ mp.mpd.abtData[2] ^ mp.mpd.abtData[3]);
printf("Expecting BCC: %02X, found: %02X\n", computed_bcc, mp.mpd.abtData[4]);
return false;
}
}