ParagonIE_Sodium_Crypto32::scalarmult_throw_if_zero() protected WP 1.0

This throws an Error if a zero public key was passed to the function.

{} It's a method of the class: ParagonIE_Sodium_Crypto32{}

No Hooks.

Return

null. Nothing.

Usage

$result = ParagonIE_Sodium_Crypto32::scalarmult_throw_if_zero( $q );

$q(string) (required)

-

Code of ParagonIE_Sodium_Crypto32::scalarmult_throw_if_zero() ParagonIE Sodium Crypto32::scalarmult throw if zero ^{WP 5.8.3}

protected static function scalarmult_throw_if_zero($q)
{
    $d = 0;
    for ($i = 0; $i < self::box_curve25519xsalsa20poly1305_SECRETKEYBYTES; ++$i) {
        $d |= ParagonIE_Sodium_Core32_Util::chrToInt($q[$i]);
    }

    /* branch-free variant of === 0 */
    if (-(1 & (($d - 1) >> 8))) {
        throw new SodiumException('Zero public key is not allowed');
    }
}