oxcaptcha.php

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<?php

class oxCaptcha extends oxSuperCfg
{
    protected $_iMacLength = 5;

    protected $_sText = null;

    private $_sMacChars  = 'abcdefghijkmnpqrstuvwxyz23456789';

    public function getText()
    {
        if (!$this->_sText) {
            for ( $i=0; $i < $this->_iMacLength; $i++ ) {
                $this->_sText .= strtolower($this->_sMacChars{ rand( 0, strlen($this->_sMacChars) - 1 ) });
            }
        }


        return $this->_sText;
    }

    public function getHash($sText = null)
    {
        if (!$sText) {
            $sText = $this->getText();
        }

        $sText = strtolower($sText);

        return md5( "ox{$sText}" );
    }

    public function getImageUrl()
    {
        $sUrl = $this->getConfig()->getCoreUtilsURL() . "verificationimg.php?e_mac=";
        $sUrl .= oxUtils::getInstance()->strMan( $this->getText() );

        return $sUrl;
    }

    public function isImageVisible()
    {
        return (( function_exists('imagecreatetruecolor') || function_exists( 'imagecreate' ) ) && $this->getConfig()->getConfigParam( 'iUseGDVersion' ) > 1 );
    }

    public function pass($sMac, $sMacHash)
    {
        return strlen( $sMacHash ) == 32 && $this->getHash($sMac) == $sMacHash;
    }
}