* Stretch the key using the PBKDF2 algorithm * * @param string $algo the algorithm to use * @param string $key the key to stretch * @param string $salt a random salt * @param int $rounds the number of rounds to derive * @param int $length the length of the output key * @return string the derived key */
($algo, $key, $salt, $rounds, $length)
source not stored for this graph (policy: none)