ParagonIE_Sodium_Core32_Ed25519::small_order() public WP 1.0

{} Это метод класса: ParagonIE_Sodium_Core32_Ed25519{}

Хуков нет.

Возвращает

true|false.

Использование

$result = ParagonIE_Sodium_Core32_Ed25519::small_order( $R );

$R(строка) (обязательный)

-

Код ParagonIE_Sodium_Core32_Ed25519::small_order() ParagonIE Sodium Core32 Ed25519::small order ^{WP 5.8.1}

public static function small_order($R)
{
    static $blocklist = array(
        /* 0 (order 4) */
        array(
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
        ),
        /* 1 (order 1) */
        array(
            0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
        ),
        /* 2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
        array(
            0x26, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
            0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
            0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
            0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x05
        ),
        /* 55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
        array(
            0xc7, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
            0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
            0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
            0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0x7a
        ),
        /* p-1 (order 2) */
        array(
            0x13, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
            0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
            0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
            0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x85
        ),
        /* p (order 4) */
        array(
            0xb4, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
            0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
            0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
            0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0xfa
        ),
        /* p+1 (order 1) */
        array(
            0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
        ),
        /* p+2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
        array(
            0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
        ),
        /* p+55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
        array(
            0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
        ),
        /* 2p-1 (order 2) */
        array(
            0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
        ),
        /* 2p (order 4) */
        array(
            0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
        ),
        /* 2p+1 (order 1) */
        array(
            0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
        )
    );
    /** @var array<int, array<int, int>> $blocklist */
    $countBlocklist = count($blocklist);

    for ($i = 0; $i < $countBlocklist; ++$i) {
        $c = 0;
        for ($j = 0; $j < 32; ++$j) {
            $c |= self::chrToInt($R[$j]) ^ $blocklist[$i][$j];
        }
        if ($c === 0) {
            return true;
        }
    }
    return false;
}