nonce creation

nonce.py

# PHP code
function create_nonce()
    {
        $mt = microtime();
        $rand = mt_rand();

        return preg_replace('/[^a-zA-Z0-9]/', '', base64_encode(sha1($mt . $rand, true)));
    }

# Python code
def create_nonce(self):
        """Create a nonce to be used as part of a signature"""
        mt = '%f %d' % math.modf(time.time())
        rando = str(random.randint(0, sys.maxint))

        return re.sub('/[^a-zA-Z0-9]/', '', b64encode(sha1(mt + rando).digest()))