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fix: using the right sized param, helps..

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This commit is contained in:
iceman1001 2020-04-04 07:03:30 +02:00
commit 945bbe6311
1 changed files with 15 additions and 11 deletions
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26
client/cmdhflegic.c
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@ -170,22 +170,26 @@ static int usage_legic_wipe(void) {
return PM3_SUCCESS; return PM3_SUCCESS;
} }
static bool legic_xor(uint8_t *data, uint8_t cardsize) { static bool legic_xor(uint8_t *data, uint16_t cardsize) {
bool ret = true;
if (cardsize <= 22) {
PrintAndLogEx(INFO, "No obsfuscation such small dump");
return false;
}
uint8_t crc = data[4]; uint8_t crc = data[4];
uint32_t calc_crc = CRC8Legic(data, 4); uint32_t calc_crc = CRC8Legic(data, 4);
if (crc != calc_crc) { if (crc != calc_crc) {
PrintAndLogEx(INFO, "Crc mismatch, obsfuscation not possible"); PrintAndLogEx(INFO, "Crc mismatch, obsfuscation not possible");
ret = false; return false;
} else if (cardsize <= 22) { }
PrintAndLogEx(INFO, "No obsfuscation such small dump");
} else {
for(uint16_t i = 22; i < cardsize - 22; i++) { for(uint16_t i = 22; i < cardsize - 22; i++) {
data[i] ^= crc; data[i] ^= crc;
}
PrintAndLogEx(SUCCESS, "Obsfuscation done");
} }
return ret; PrintAndLogEx(SUCCESS, "Obsfuscation done");
return true;
} }
/* /*