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fix: 'hf mf nack' - now does it better..

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This commit is contained in:
iceman1001 2017-12-06 00:03:34 +01:00
commit 6a028bdd18
1 changed files with 7 additions and 13 deletions
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20
armsrc/iso14443a.c
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@ -2600,11 +2600,6 @@ void DetectNACKbug() {
isOK = 2;
break;
}
if ( (i > 1) && (num_nacks == 1) ) {
// NACK bug
isOK = 1;
break;
}
WDT_HIT();
@ -2660,6 +2655,11 @@ void DetectNACKbug() {
// Transmit reader nonce with fake par
ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
if (ReaderReceive(receivedAnswer, receivedAnswerPar)) {
received_nack = true;
num_nacks++;
}
// we didn't calibrate our clock yet,
// iceman: has to be calibrated every time.
if (previous_nt && !nt_attacked) {
@ -2747,21 +2747,15 @@ void DetectNACKbug() {
}
// Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
if (ReaderReceive(receivedAnswer, receivedAnswerPar)) {
if (received_nack)
catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer
received_nack = true;
num_nacks++;
}
// we are testing all 256 possibilities.
par[0]++;
// tried all 256 possible parities without success.
if (par[0] == 0) {
if ( num_nacks > 1 )
isOK = -2;
if (par[0] == 0)
break;
}
// reset the resyncs since we got a complete transaction on right time.
consecutive_resyncs = 0;