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 );
    }

}