ParagonIE_Sodium_Core32_Int32::mulInt32() │ public │ WP 1.0

{} Это метод класса: ParagonIE_Sodium_Core32_Int32{}

Хуков нет.

Возвращает

ParagonIE_Sodium_Core32_Int32.

Использование

$ParagonIE_Sodium_Core32_Int32 = new ParagonIE_Sodium_Core32_Int32();
$ParagonIE_Sodium_Core32_Int32->mulInt32( $int, $size );

$int(ParagonIE_Sodium_Core32_Int32) (обязательный)

-

$size(int)

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Код ParagonIE_Sodium_Core32_Int32::mulInt32() ParagonIE Sodium Core32 Int32::mulInt32 ^{WP 6.0}

public function mulInt32(ParagonIE_Sodium_Core32_Int32 $int, $size = 0)
{
    ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
    if (ParagonIE_Sodium_Compat::$fastMult) {
        return $this->mulInt32Fast($int);
    }
    if (!$size) {
        $size = 31;
    }
    /** @var int $size */

    $a = clone $this;
    $b = clone $int;
    $return = new ParagonIE_Sodium_Core32_Int32();
    $return->unsignedInt = $this->unsignedInt;

    // Initialize:
    $ret0 = 0;
    $ret1 = 0;
    $a0 = $a->limbs[0];
    $a1 = $a->limbs[1];
    $b0 = $b->limbs[0];
    $b1 = $b->limbs[1];

    /** @var int $size */
    /** @var int $i */
    for ($i = $size; $i >= 0; --$i) {
        $m = (int) (-($b1 & 1));
        $x0 = $a0 & $m;
        $x1 = $a1 & $m;

        $ret1 += $x1;
        $c = $ret1 >> 16;

        $ret0 += $x0 + $c;

        $ret0 &= 0xffff;
        $ret1 &= 0xffff;

        $a1 = ($a1 << 1);
        $x1 = $a1 >> 16;
        $a0 = ($a0 << 1) | $x1;
        $a0 &= 0xffff;
        $a1 &= 0xffff;

        $x0 = ($b0 & 1) << 16;
        $b0 = ($b0 >> 1);
        $b1 = (($b1 | $x0) >> 1);

        $b0 &= 0xffff;
        $b1 &= 0xffff;

    }
    $return->limbs[0] = $ret0;
    $return->limbs[1] = $ret1;

    return $return;
}