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Reorder UID/CRC check so we get only the interesting CRC errors.

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This commit is contained in:
Simon Josefsson 2009-06-24 18:23:47 +00:00
parent d29fce0bfc
commit 42bd2d68b0
1 changed files with 5 additions and 5 deletions
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10
ykksm-decrypt.php
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@ -79,17 +79,17 @@ $internalName = $row['internalName'];
$ciphertext = modhex2hex($modhex_ciphertext);
$plaintext = aes128ecb_decrypt($aesKey, $ciphertext);
if (!crc_is_good($plaintext)) {
syslog(LOG_ERR, "CRC error: $otp: $plaintext");
die("ERR Corrupt OTP\n");
}
$uid = substr($plaintext, 0, 12);
if (strcmp($uid, $internalName) != 0) {
syslog(LOG_ERR, "UID error: $otp $plaintext: $uid vs $internalName");
die("ERR Corrupt OTP\n");;
}
if (!crc_is_good($plaintext)) {
syslog(LOG_ERR, "CRC error: $otp: $plaintext");
die("ERR Corrupt OTP\n");
}
# Mask out interesting fields
$counter = substr($plaintext, 14, 2) . substr($plaintext, 12, 2);
$low = substr($plaintext, 18, 2) . substr($plaintext, 16, 2);