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Explicit check for signature length before verifying to avoid exception

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This commit is contained in:
Ondrej Mikle 2017-10-27 19:23:28 +02:00
parent 5730ad184c
commit d4a382ed2f
1 changed files with 3 additions and 0 deletions
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3
brmdoor_authenticator.py
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@ -185,6 +185,9 @@ class DesfireEd25519Authenthicator(object):
try: try:
ndefSignature = self.nfcReader.readDesfireNDEF() ndefSignature = self.nfcReader.readDesfireNDEF()
if len(ndefSignature) != 64:
logging.error("NDEF signature has wrong length")
return None
if self.signatureCheck(uid_hex.decode("hex"), ndefSignature): if self.signatureCheck(uid_hex.decode("hex"), ndefSignature):
return UidRecord(uid_hex, nick) return UidRecord(uid_hex, nick)
else: else: