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Fix EMV flow for cards without usable READ RECORD

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Capture Track 2 (tag 57) from the GPO response when available and avoid sending the fixed READ RECORD APDU if the token was already found.
This prevents unnecessary 6A83 responses and improves compatibility with cards that return the required data during GPO.
This commit is contained in:
Davi Mikael
2026-03-24 20:22:53 -03:00
parent 7bedde39a7
commit c268844d50
1 changed files with 11 additions and 6 deletions
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armsrc/Standalone/hf_emvpng.c
+11 -6
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@@ -301,9 +301,14 @@ void RunMod(void) {
if (iso14443a_select_card(NULL, &card_a_info, NULL, true, 0, false)) {
DbpString(_YELLOW_("+") "Found ISO 14443 Type A!");
chktoken = false;
for (uint8_t i = 0; i < 4; i++) {
chktoken = false;
if (i == 3 && chktoken) {
break; // já achei a 57 no GPO, não preciso de READ RECORD
}
LED_C_OFF();
LED_B_ON();
uint8_t apdulen = iso14_apdu(apdus[i], (uint16_t) apduslen[i], false, apdubuffer, sizeof(apdubuffer), NULL);
@@ -331,13 +336,13 @@ void RunMod(void) {
}
} else if (i == 3) {
} else if (i == 2 || i == 3) {
// find track 2
if (apdubuffer[u] == 0x57 && apdubuffer[u + 1] == 0x13 && !chktoken) {
// find track 2 in GPO or READ RECORD
if (u + 20 < apdulen && apdubuffer[u] == 0x57 && apdubuffer[u + 1] == 0x13 && !chktoken) {
chktoken = true;
memcpy(&token, &apdubuffer[u + 2], 19);
memcpy(token, &apdubuffer[u + 2], 19);
break;
}
}