ParagonIE_Sodium_Core32_Int64

10class ParagonIE_Sodium_Core32_Int6411{12    /**13     * @var array<int, int> - four 16-bit integers14     */15    public $limbs = array(0, 0, 0, 0);16 17    /**18     * @var int19     */20    public $overflow = 0;21 22    /**23     * @var bool24     */25    public $unsignedInt = false;26 27    /**28     * ParagonIE_Sodium_Core32_Int64 constructor.29     * @param array $array30     * @param bool $unsignedInt31     */32    public function __construct($array = array(0, 0, 0, 0), $unsignedInt = false)33    {34        $this->limbs = array(35            (int) $array[0],36            (int) $array[1],37            (int) $array[2],38            (int) $array[3]39        );40        $this->overflow = 0;41        $this->unsignedInt = $unsignedInt;42    }43 44    /**45     * Adds two int64 objects46     *47     * @param ParagonIE_Sodium_Core32_Int64 $addend48     * @return ParagonIE_Sodium_Core32_Int6449     */50    public function addInt64(ParagonIE_Sodium_Core32_Int64 $addend)51    {52        $i0 = $this->limbs[0];53        $i1 = $this->limbs[1];54        $i2 = $this->limbs[2];55        $i3 = $this->limbs[3];56        $j0 = $addend->limbs[0];57        $j1 = $addend->limbs[1];58        $j2 = $addend->limbs[2];59        $j3 = $addend->limbs[3];60 61        $r3 = $i3 + ($j3 & 0xffff);62        $carry = $r3 >> 16;63 64        $r2 = $i2 + ($j2 & 0xffff) + $carry;65        $carry = $r2 >> 16;66 67        $r1 = $i1 + ($j1 & 0xffff) + $carry;68        $carry = $r1 >> 16;69 70        $r0 = $i0 + ($j0 & 0xffff) + $carry;71        $carry = $r0 >> 16;72 73        $r0 &= 0xffff;74        $r1 &= 0xffff;75        $r2 &= 0xffff;76        $r3 &= 0xffff;77 78        $return = new ParagonIE_Sodium_Core32_Int64(79            array($r0, $r1, $r2, $r3)80        );81        $return->overflow = $carry;82        $return->unsignedInt = $this->unsignedInt;83        return $return;84    }85 86    /**87     * Adds a normal integer to an int64 object88     *89     * @param int $int