Can I change the default wordpress password hashing system by overriding the wp_hash_password function from plugin?

If yes, then what will happen to old stored passwords in DB? How will they be validated for login?


Just figured it out. So thought to leave the solution here, if someone else need it:

To change the default hashing system, need to overwrite wp_hash_password() function: (can be done in a plugin)

if ( !function_exists('wp_hash_password') ){
    function wp_hash_password($password) {
                //apply your own hashing structure here
            return $password;

Now you will need to overwrite wp_check_password() to match your hashing structure: (can be done in a plugin as well)

if ( !function_exists('wp_check_password') ){
    function wp_check_password($password, $hash, $user_id = '') {
            //check for your hash match
            return apply_filters('check_password', $check, $password, $hash, $user_id);

Please check wp_check_password

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