phpass is a portable password hashing framework for use in PHP applications. The preferred (most secure) hashing method supported by phpass is the OpenBSD-style bcrypt (known in PHP as CRYPT_BLOWFISH), with a fallback to BSDI-style extended DES-based hashes (known in PHP as CRYPT_EXT_DES), and a last resort fallback to an MD5-based variable iteration count password hashing method implemented in phpass itself.

Place the files from the repository in their respective folders (or use spark). Edit the config/phpass.php configuration file if needed.

$this->load->library('phpass'); // or use spark

// example 1: hashing a password
$password = $this->input->post('password');
$hashed = $this->phpass->hash($password);

// example 2: checking a password
$user = $this->user_model->get(123);
$hashed = $user->password;
$password = $this->input->post('password');

if ($this->phpass->check($password, $hashed))
    echo 'logged in';
else
    echo 'wrong password';

NOTE: the hash and check methods are merely alias methods for the original HashPassword and CheckPassword that are also available.