ParagonIE_Sodium_Core_AES_Block::swapN( int $cl, int $ch, int $s, int $x, int $y ): self

171    public function swapN($cl, $ch, $s, $x, $y)172    {173        static $u32mask = ParagonIE_Sodium_Core_Util::U32_MAX;174        $a = $this->values[$x] & $u32mask;175        $b = $this->values[$y] & $u32mask;176        // (x) = (a & cl) | ((b & cl) << (s));177        $this->values[$x] = ($a & $cl) | ((($b & $cl) << $s) & $u32mask);178        // (y) = ((a & ch) >> (s)) | (b & ch);179        $this->values[$y] = ((($a & $ch) & $u32mask) >> $s) | ($b & $ch);180        return $this;181    }