gistfile1.php

<?php
/* 
 *  Copyright 2009 Lupimedia
 *  All rights reserved
 */
class Lupi_Validate_Password extends Zend_Validate_Abstract
{
    const NO_MATCH = 'noMatch';

    protected $_messageTemplates = array(
      self::NO_MATCH => 'Passwords do not match',
    );

    protected $_element = null;

    public function getElement()
    {
        if (null === $this->_element) {
            $this->_element = 'password';
        }
        return $this->_element;
    }

    public function setElement($element)
    {
        $this->_element = (string) $element;
    }

    public function isValid($value, $context = null)
    {

        $this->_setValue($value);

        if ($value !== $context[$this->getElement()]) {
            $this->_error(self::NO_MATCH);
            return false;
        }
        return true;
    }
}