ParagonIE_Sodium_Core32_ChaCha20_Ctx::__construct() │ public │ WP 1.0

ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.

{} Это метод класса: ParagonIE_Sodium_Core32_ChaCha20_Ctx{}

Хуков нет.

Возвращает

null. Ничего.

Использование

$ParagonIE_Sodium_Core32_ChaCha20_Ctx = new ParagonIE_Sodium_Core32_ChaCha20_Ctx();
$ParagonIE_Sodium_Core32_ChaCha20_Ctx->__construct( $key, $iv, $counter );

$key(строка)

ChaCha20 key.
По умолчанию: ''

$iv(строка)

Initialization Vector (a.k.a. nonce).
По умолчанию: ''

$counter(строка)

The initial counter value.
По умолчанию: 8 0x00 bytes

Код ParagonIE_Sodium_Core32_ChaCha20_Ctx::__construct() ParagonIE Sodium Core32 ChaCha20 Ctx:: construct ^{WP 5.9.3}

public function __construct($key = '', $iv = '', $counter = '')
{
    if (self::strlen($key) !== 32) {
        throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');
    }
    if (self::strlen($iv) !== 8) {
        throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');
    }
    $this->container = new SplFixedArray(16);

    /* "expand 32-byte k" as per ChaCha20 spec */
    $this->container[0]  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
    $this->container[1]  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
    $this->container[2]  = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
    $this->container[3]  = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));

    $this->container[4]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));
    $this->container[5]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));
    $this->container[6]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));
    $this->container[7]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));
    $this->container[8]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));
    $this->container[9]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));
    $this->container[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));
    $this->container[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));

    if (empty($counter)) {
        $this->container[12] = new ParagonIE_Sodium_Core32_Int32();
        $this->container[13] = new ParagonIE_Sodium_Core32_Int32();
    } else {
        $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4));
        $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 4, 4));
    }
    $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4));
    $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4));
}