BcryptPassword.php

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<?php
class BcryptPassword extends ParameterizedPassword {
    protected function getDefaultParams() {
        return array(
            'rounds' => $this->config['cost'],
        );
    }

    protected function getDelimiter() {
        return '$';
    }

    protected function parseHash( $hash ) {
        parent::parseHash( $hash );

        $this->params['rounds'] = (int)$this->params['rounds'];
    }

    public function crypt( $password ) {
        if ( !defined( 'CRYPT_BLOWFISH' ) ) {
            throw new MWException( 'Bcrypt is not supported.' );
        }

        // Either use existing hash or make a new salt
        // Bcrypt expects 22 characters of base64-encoded salt
        // Note: bcrypt does not use MIME base64. It uses its own base64 without any '=' padding.
        //       It expects a 128 bit salt, so it will ignore anything after the first 128 bits
        if ( !isset( $this->args[0] ) ) {
            $this->args[] = substr(
                // Replace + with ., because bcrypt uses a non-MIME base64 format
                strtr(
                    // Random base64 encoded string
                    base64_encode( MWCryptRand::generate( 16, true ) ),
                    '+', '.'
                ),
                0, 22
            );
        }

        $hash = crypt( $password,
            sprintf( '$2y$%02d$%s', (int)$this->params['rounds'], $this->args[0] ) );

        if ( !is_string( $hash ) || strlen( $hash ) <= 13 ) {
            throw new PasswordError( 'Error when hashing password.' );
        }

        // Strip the $2y$
        $parts = explode( $this->getDelimiter(), substr( $hash, 4 ) );
        $this->params['rounds'] = (int)$parts[0];
        $this->args[0] = substr( $parts[1], 0, 22 );
        $this->hash = substr( $parts[1], 22 );
    }
}