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<?php
function qes2_key ( $key = null ) {
    $key = str_split( $key );
    $keycount = count( $key );
    $xspos = 1;
    $summ = 0;
    foreach( $key as $letter ) {
        $summ += ord( $letter ) * 2 + $xspos + ( $keycount / $xspos );
        $xspos++;
    }
    $summ = explode('.', $summ );
    return $summ[0];
}
	
function qes2_encrypt ( $input, $key ) {
    $input = str_split( $input );
    $icount = count( $input );
    $rsumm = qes2_key( $key );
    $result = '';
    $xspos = 1;
    $xsdisp = 1;
    foreach( $input as $letter ) {
        $char = ord( $letter ) + ( $rsumm * $xspos ) - $xsdisp ;
        $result .= chr( $char );
        $xspos++;
        $xsdisp += 1;
    }
    return $result;
}
	
function qes2_decrypt ( $input, $key ) {
    $input = str_split( $input );
    $icount = count( $input );
    $rsumm = qes2_key( $key );
    $result = '';
    $xspos = 1;
    $xsdisp = 1;
    foreach( $input as $letter ) {
        $char = ord( $letter ) - ( $rsumm * $xspos ) + $xsdisp ;
        $result .= chr( $char );
        $xspos++;
        $xsdisp += 1;
    }
    return $result;
}
                                 
        
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