ParagonIE_Sodium_Core32_Int32::mulIntFast() public WP 1.0

{} It's a method of the class: ParagonIE_Sodium_Core32_Int32{}

No Hooks.

Return

ParagonIE_Sodium_Core32_Int32. Null. Nothing.

Usage

$ParagonIE_Sodium_Core32_Int32 = new ParagonIE_Sodium_Core32_Int32();
$ParagonIE_Sodium_Core32_Int32->mulIntFast( $int );

$int(int) (required)

-

Code of ParagonIE_Sodium_Core32_Int32::mulIntFast() ParagonIE Sodium Core32 Int32::mulIntFast ^{WP 5.7.1}

<?php
public function mulIntFast($int)
{
    // Handle negative numbers
    $aNeg = ($this->limbs[0] >> 15) & 1;
    $bNeg = ($int >> 31) & 1;
    $a = array_reverse($this->limbs);
    $b = array(
        $int & 0xffff,
        ($int >> 16) & 0xffff
    );
    if ($aNeg) {
        for ($i = 0; $i < 2; ++$i) {
            $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
        }
        ++$a[0];
    }
    if ($bNeg) {
        for ($i = 0; $i < 2; ++$i) {
            $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
        }
        ++$b[0];
    }
    // Multiply
    $res = $this->multiplyLong($a, $b);

    // Re-apply negation to results
    if ($aNeg !== $bNeg) {
        for ($i = 0; $i < 2; ++$i) {
            $res[$i] = (0xffff ^ $res[$i]) & 0xffff;
        }
        // Handle integer overflow
        $c = 1;
        for ($i = 0; $i < 2; ++$i) {
            $res[$i] += $c;
            $c = $res[$i] >> 16;
            $res[$i] &= 0xffff;
        }
    }

    // Return our values
    $return = new ParagonIE_Sodium_Core32_Int32();
    $return->limbs = array(
        $res[1] & 0xffff,
        $res[0] & 0xffff
    );
    if (count($res) > 2) {
        $return->overflow = $res[2] & 0xffff;
    }
    $return->unsignedInt = $this->unsignedInt;
    return $return;
}