ParagonIE_Sodium_Core_AES_KeySchedule::expand(): ParagonIE_Sodium_Core_AES_Expanded

66    public function expand()67    {68        $exp = new ParagonIE_Sodium_Core_AES_Expanded(69            array_fill(0, 120, 0),70            $this->numRounds71        );72        $n = ($exp->numRounds + 1) << 2;73        for ($u = 0, $v = 0; $u < $n; ++$u, $v += 2) {74            $x = $y = $this->skey[$u];75            $x &= 0x55555555;76            $exp->skey[$v] = ($x | ($x << 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;77            $y &= 0xAAAAAAAA;78            $exp->skey[$v + 1] = ($y | ($y >> 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;79        }80        return $exp;81    }