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reduce stack usage

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This commit is contained in:
iceman1001 2023-12-15 16:39:42 +01:00
parent 20d95fa3ea
commit 1c8b2110bb
1 changed files with 12 additions and 17 deletions
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29
armsrc/mifarecmd.c
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@ -1052,14 +1052,9 @@ void MifareNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo, uint8
};
// cards with fixed nonce
/*
if (nt1 == nt2) {
Dbprintf("Nested: %08x vs %08x", nt1, nt2);
break;
}
*/
// NXP Mifare is typical around 840,but for some unlicensed/compatible mifare card this can be 160
uint32_t nttmp = prng_successor(nt1, 100); //NXP Mifare is typical around 840,but for some unlicensed/compatible mifare card this can be 160
uint32_t nttmp = prng_successor(nt1, 100);
for (i = 101; i < 1200; i++) {
nttmp = prng_successor(nttmp, 1);
if (nttmp == nt2) break;
@ -1071,12 +1066,14 @@ void MifareNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo, uint8
dmin = MIN(dmin, i);
dmax = MAX(dmax, i);
} else {
delta_time = auth2_time - auth1_time + 32; // allow some slack for proper timing
// allow some slack for proper timing
delta_time = auth2_time - auth1_time + 32;
}
if (g_dbglevel >= DBG_DEBUG) Dbprintf("Nested: calibrating... ntdist=%d", i);
} else {
unsuccessful_tries++;
if (unsuccessful_tries > NESTED_MAX_TRIES) { // card isn't vulnerable to nested attack (random numbers are not predictable)
// card isn't vulnerable to nested attack (random numbers are not predictable)
if (unsuccessful_tries > NESTED_MAX_TRIES) {
isOK = PM3_EFAILED;
}
}
@ -1146,7 +1143,7 @@ void MifareNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo, uint8
// nested authentication
auth2_time = auth1_time + delta_time;
len = mifare_sendcmd_short(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, &auth2_time);
len = mifare_sendcmd_short(pcs, AUTH_NESTED, MIFARE_AUTH_KEYA + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, &auth2_time);
if (len != 4) {
if (g_dbglevel >= DBG_INFO) Dbprintf("Nested: Auth2 error len=%d", len);
continue;
@ -1271,7 +1268,7 @@ void MifareStaticNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo,
target_nt[1] = prng_successor(nt1, 320);
}
len = mifare_sendcmd_short(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, NULL);
len = mifare_sendcmd_short(pcs, AUTH_NESTED, MIFARE_AUTH_KEYA + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, NULL);
if (len != 4) {
continue;
};
@ -1296,10 +1293,11 @@ void MifareStaticNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo,
continue;
};
len = mifare_sendcmd_short(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, NULL);
len = mifare_sendcmd_short(pcs, AUTH_NESTED, MIFARE_AUTH_KEYA + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, par, NULL);
if (len != 4) {
continue;
};
nt3 = bytes_to_num(receivedAnswer, 4);
target_ks[1] = nt3 ^ target_nt[1];
@ -2632,8 +2630,7 @@ void MifareHasStaticNonce(void) {
uint8_t counter = 0;
for (uint8_t i = 0; i < 3; i++) {
iso14a_card_select_t card_info;
if (!iso14443a_select_card(uid, &card_info, NULL, true, 0, true)) {
if (!iso14443a_select_card(uid, NULL, NULL, true, 0, true)) {
retval = PM3_ESOFT;
goto OUT;
}
@ -2699,9 +2696,8 @@ void MifareHasStaticEncryptedNonce(uint8_t block_no, uint8_t key_type, uint8_t *
iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN);
iso14a_card_select_t card_info;
uint32_t cuid = 0;
if (!iso14443a_select_card(uid, &card_info, &cuid, true, 0, true)) {
if (!iso14443a_select_card(uid, NULL, &cuid, true, 0, true)) {
retval = PM3_ESOFT;
goto OUT;
}
@ -2779,7 +2775,6 @@ int DoGen3Cmd(uint8_t *cmd, uint8_t cmd_len) {
}
iso14a_set_timeout(save_iso14a_timeout);
LED_B_OFF();
return retval;
}