oxencryptor.php

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<?php

class oxEncryptor
{

    public function encrypt($sString, $sKey)
    {
        $sString = "ox{$sString}id";

        $sKey = $this->_formKey($sKey, $sString);

        $sString = $sString ^ $sKey;
        $sString = base64_encode($sString);
        $sString = str_replace("=", "!", $sString);

        return "ox_$sString";
    }

    protected function _formKey($sKey, $sString)
    {
        $sKey = '_' . $sKey;
        $iKeyLength = (strlen($sString) / strlen($sKey)) + 5;

        return str_repeat($sKey, $iKeyLength);
    }
}