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chg: 'hf mf nack' - only test all 256 parities for one nonce when synced.

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0 nack = has not bug.
1 nack == has bug
x nacks == most likely a clone card which answers nack to all requests.
This commit is contained in:
iceman1001 2017-12-05 17:57:44 +01:00
commit 6e5038f224
2 changed files with 43 additions and 71 deletions
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10
client/cmdhfmf.c
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@ -2871,22 +2871,16 @@ int CmdHf14AMfNack(const char *Cmd) {
uint32_t nacks = resp.arg[1];
uint32_t auths = resp.arg[2];
PrintAndLog("Three different nonces used, expecting three nacks");
PrintAndLog("Num of sent auth requestes : %u", auths);
PrintAndLog("Num of received NACK : %u", nacks);
switch( ok ) {
case -1 : PrintAndLog("Button pressed. Aborted."); return 1;
case -2 : PrintAndLog("Card answers NACK, (most likely a clone)"); return 1;
case -3 : PrintAndLog("Card random number generator is not predictable)."); return 1;
case -4 : PrintAndLog("Card random number generator seems to be based on the wellknown");
PrintAndLog("generating polynomial with 16 effective bits only, but shows unexpected behaviour."); return 1;
case 1 : PrintAndLog("Card has NACK bug."); return 1;
case 0 : {
if ( nacks > 0 )
PrintAndLog("Card may have NACK bug. inconclusive result");
else
PrintAndLog("Card has not NACK bug.");
return 1;
}
case 0 : PrintAndLog("Card has not NACK bug."); return 1;
default : PrintAndLog(" errorcode from device [%i]", ok); return 1;
}
break;