ParagonIE_Sodium_Core32_Int32::mulInt32Fast() 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->mulInt32Fast( $right );

$right(ParagonIE_Sodium_Core32_int32) (required)

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Code of ParagonIE_Sodium_Core32_Int32::mulInt32Fast() ParagonIE Sodium Core32 Int32::mulInt32Fast ^{WP 5.7}

<?php
public function mulInt32Fast(ParagonIE_Sodium_Core32_Int32 $right)
{
    $aNeg = ($this->limbs[0] >> 15) & 1;
    $bNeg = ($right->limbs[0] >> 15) & 1;

    $a = array_reverse($this->limbs);
    $b = array_reverse($right->limbs);
    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];
    }
    $res = $this->multiplyLong($a, $b);
    if ($aNeg !== $bNeg) {
        if ($aNeg !== $bNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $res[$i] = ($res[$i] ^ 0xffff) & 0xffff;
            }
            $c = 1;
            for ($i = 0; $i < 2; ++$i) {
                $res[$i] += $c;
                $c = $res[$i] >> 16;
                $res[$i] &= 0xffff;
            }
        }
    }
    $return = new ParagonIE_Sodium_Core32_Int32();
    $return->limbs = array(
        $res[1] & 0xffff,
        $res[0] & 0xffff
    );
    if (count($res) > 2) {
        $return->overflow = $res[2];
    }
    return $return;
}