Pbkdf2Password.php

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<?php
class Pbkdf2Password extends ParameterizedPassword {
    protected function getDefaultParams() {
        return [
            'algo' => $this->config['algo'],
            'rounds' => $this->config['cost'],
            'length' => $this->config['length']
        ];
    }
 
    protected function getDelimiter() {
        return ':';
    }
 
    public function crypt( $password ) {
        if ( count( $this->args ) == 0 ) {
            $this->args[] = base64_encode( random_bytes( 16 ) );
        }
 
        $hash = hash_pbkdf2(
            $this->params['algo'],
            $password,
            base64_decode( $this->args[0] ),
            (int)$this->params['rounds'],
            (int)$this->params['length'],
            true
        );
        if ( !is_string( $hash ) ) {
            throw new PasswordError( 'Error when hashing password.' );
        }
 
        $this->hash = base64_encode( $hash );
    }
}