def signed_deserialize(serialized, secret, hmac=hmac):
 try:
  (input_sig, pickled) = (bytes_(serialized[:40]), base64.b64decode(bytes_(serialized[40:])))
 except (binascii.Error, TypeError) as e:
  raise ValueError(('Badly formed base64 data: %s' % e))
 try:
  secret = bytes_(secret)
 except UnicodeEncodeError:
  secret = bytes_(secret, 'utf-8')
 sig = bytes_(hmac.new(secret, pickled, hashlib.sha1).hexdigest())
 if strings_differ(sig, input_sig):
  raise ValueError('Invalid signature')
 return pickle.loads(pickled)

def signed_deserialize ( serialized , secret , hmac = hmac ) : try : ( input_sig , pickled ) = ( bytes_ ( serialized [ : 40 ] ) , base64 . b64decode ( bytes_ ( serialized [ 40 : ] ) ) ) except ( binascii . Error , TypeError ) as e : raise ValueError ( ( 'Badly formed base64 data: %s' % e ) ) try : secret = bytes_ ( secret ) except UnicodeEncodeError : secret = bytes_ ( secret , 'utf-8' ) sig = bytes_ ( hmac . new ( secret , pickled , hashlib . sha1 ) . hexdigest ( ) ) if strings_differ ( sig , input_sig ) : raise ValueError ( 'Invalid signature' ) return pickle . loads ( pickled )
deserialize the value returned from signed_serialize .