220      * @param int $exponent
223     abstract protected function pow($base, $exponent);  argument
248     function pow($base, $exponent)  argument
250         return bcpow($base, $exponent);
283      * @param int $exponent
287     function _powmod($base, $exponent, $modulus)  argument
291         while($this->cmp($exponent, 0) > 0) {
292             if ($this->mod($exponent, 2)) {
296             $exponent = $this->div($exponent, 2);
301     function powmod($base, $exponent, $modulus)  argument
304             return bcpowmod($base, $exponent, $modulus);
306             return $this->_powmod($base, $exponent, $modulus);
338     function pow($base, $exponent)  argument
340         return gmp_pow($base, $exponent);
368     function powmod($base, $exponent, $modulus)  argument
370         return gmp_powm($base, $exponent, $modulus);