C:/xampp/htdocs/moodle/lib/zend/Zend/Service/ReCaptcha/MailHide.php

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<?php
require_once 'Zend/Service/ReCaptcha.php';

class Zend_Service_ReCaptcha_MailHide extends Zend_Service_ReCaptcha
{
    const ENCRYPTION_MODE = MCRYPT_MODE_CBC;
    const ENCRYPTION_CIPHER = MCRYPT_RIJNDAEL_128;
    const ENCRYPTION_BLOCK_SIZE = 16;
    const ENCRYPTION_IV = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
    const MAILHIDE_SERVER = 'http://mailhide.recaptcha.net/d';

    protected $_email = null;

    protected $_emailValidator;

    protected $_privateKeyPacked = null;

    protected $_emailLocalPart = null;

    protected $_emailDomainPart = null;

    public function __construct($publicKey = null, $privateKey = null, $email = null, $options = null)
    {
        /* Require the mcrypt extension to be loaded */
        $this->_requireMcrypt();

        /* If options is a Zend_Config object we want to convert it to an array so we can merge it with the default options */
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        }

        /* Merge if needed */
        if (is_array($options)) {
            $options = array_merge($this->getDefaultOptions(), $options);
        } else {
            $options = $this->getDefaultOptions();
        }

        parent::__construct($publicKey, $privateKey, null, $options);

        if ($email !== null) {
            $this->setEmail($email);
        }
    }


    public function getEmailValidator()
    {
        if (null === $this->_emailValidator) {
            require_once 'Zend/Validate/EmailAddress.php';
            $this->setEmailValidator(new Zend_Validate_EmailAddress());
        }
        return $this->_emailValidator;
    }

    public function setEmailValidator(Zend_Validate_Interface $validator)
    {
        $this->_emailValidator = $validator;
        return $this;
    }


    protected function _requireMcrypt()
    {
        if (!extension_loaded('mcrypt')) {
            require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';

            throw new Zend_Service_ReCaptcha_MailHide_Exception('Use of the Zend_Service_ReCaptcha_MailHide component requires the mcrypt extension to be enabled in PHP');
        }
    }

    public function __toString()
    {
        try {
            $return = $this->getHtml();
        } catch (Exception $e) {
            $return = '';
            trigger_error($e->getMessage(), E_USER_WARNING);
        }

        return $return;
    }

    public function getDefaultOptions()
    {
        return array(
            'encoding'       => 'UTF-8',
            'linkTitle'      => 'Reveal this e-mail address',
            'linkHiddenText' => '...',
            'popupWidth'     => 500,
            'popupHeight'    => 300,
        );
    }

    public function setPrivateKey($privateKey)
    {
        parent::setPrivateKey($privateKey);

        /* Pack the private key into a binary string */
        $this->_privateKeyPacked = pack('H*', $this->_privateKey);

        return $this;
    }

    public function setEmail($email)
    {
        $this->_email = $email;

        $validator = $this->getEmailValidator();
        if (!$validator->isValid($email)) {
            require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
            throw new Zend_Service_ReCaptcha_MailHide_Exception('Invalid email address provided');
        }

        $emailParts = explode('@', $email, 2);

        /* Decide on how much of the local part we want to reveal */
        if (strlen($emailParts[0]) <= 4) {
            $emailParts[0] = substr($emailParts[0], 0, 1);
        } else if (strlen($emailParts[0]) <= 6) {
            $emailParts[0] = substr($emailParts[0], 0, 3);
        } else {
            $emailParts[0] = substr($emailParts[0], 0, 4);
        }

        $this->_emailLocalPart = $emailParts[0];
        $this->_emailDomainPart = $emailParts[1];

        return $this;
    }

    public function getEmail()
    {
        return $this->_email;
    }

    public function getEmailLocalPart()
    {
        return $this->_emailLocalPart;
    }

    public function getEmailDomainPart()
    {
        return $this->_emailDomainPart;
    }

    public function getHtml($email = null)
    {
        if ($email !== null) {
            $this->setEmail($email);
        } elseif (null === ($email = $this->getEmail())) {
            require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
            throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing email address');
        }

        if ($this->_publicKey === null) {
            require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
            throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing public key');
        }

        if ($this->_privateKey === null) {
            require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
            throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing private key');
        }

        /* Generate the url */
        $url = $this->_getUrl();

        $enc = $this->getOption('encoding');

        /* Genrate the HTML used to represent the email address */
        $html = htmlentities($this->getEmailLocalPart(), ENT_COMPAT, $enc) 
            . '<a href="' 
                . htmlentities($url, ENT_COMPAT, $enc) 
                . '" onclick="window.open(\'' 
                    . htmlentities($url, ENT_COMPAT, $enc) 
                    . '\', \'\', \'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='
                    . $this->_options['popupWidth'] 
                    . ',height=' 
                    . $this->_options['popupHeight'] 
                . '\'); return false;" title="' 
                . $this->_options['linkTitle'] 
                . '">' . $this->_options['linkHiddenText'] . '</a>@' 
                . htmlentities($this->getEmailDomainPart(), ENT_COMPAT, $enc);

        return $html;
    }

    protected function _getUrl()
    {
        /* Figure out how much we need to pad the email */
        $numPad = self::ENCRYPTION_BLOCK_SIZE - (strlen($this->_email) % self::ENCRYPTION_BLOCK_SIZE);

        /* Pad the email */
        $emailPadded = str_pad($this->_email, strlen($this->_email) + $numPad, chr($numPad));

        /* Encrypt the email */
        $emailEncrypted = mcrypt_encrypt(self::ENCRYPTION_CIPHER, $this->_privateKeyPacked, $emailPadded, self::ENCRYPTION_MODE, self::ENCRYPTION_IV);

        /* Return the url */
        return self::MAILHIDE_SERVER . '?k=' . $this->_publicKey . '&c=' . strtr(base64_encode($emailEncrypted), '+/', '-_');
    }
}