def verifySignature( publicKey, data, updateLevel, signature ) :
payload = encode( ('DHT-DATA',data,updateLevel) )
if type(publicKey) is str :
k = RSAKey()
try :
k.fromDER_PublicKey( publicKey )
except RSAError :
return False
else :
k = publicKey
try :
digest = Digest(digestType).digest( payload )
k.verify( signature, digest, digestType )
return True
except RSAError :
return False
