This module uses the Password Compat Library for password encryption. This library is intended to provide forward compatibility with the password_* functions being worked on for PHP 5.5.
For more information see the PHP Wiki on Password Hash.
Requirements
This library requires PHP >= 5.3.7 OR a version that has the $2y fix backported into it (such as RedHat provides). Note that Debian's 5.3.3 version is NOT supported.
Install and Usage
You can install the module on both new and existing sites. Existing users will have their passwords updated to the new encryption when the next log in, in the same way Drupal 7 updates Drupal 6 passwords after an upgrade.
Warning
If you have installed the module and then uninstall it, users with $2y passwords will no longer be able to log in. They will be required to use the forgot password function to generate a new password.