ParagonIE_Sodium_Core_Poly1305_State

10class ParagonIE_Sodium_Core_Poly1305_State extends ParagonIE_Sodium_Core_Util11{12    /**13     * @var array<int, int>14     */15    protected $buffer = array();16 17    /**18     * @var bool19     */20    protected $final = false;21 22    /**23     * @var array<int, int>24     */25    public $h;26 27    /**28     * @var int29     */30    protected $leftover = 0;31 32    /**33     * @var int[]34     */35    public $r;36 37    /**38     * @var int[]39     */40    public $pad;41 42    /**43     * ParagonIE_Sodium_Core_Poly1305_State constructor.44     *45     * @internal You should not use this directly from another application46     *47     * @param string $key48     * @throws InvalidArgumentException49     * @throws TypeError50     */51    public function __construct($key = '')52    {53        if (self::strlen($key) < 32) {54            throw new InvalidArgumentException(55                'Poly1305 requires a 32-byte key'56            );57        }58        /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */59        $this->r = array(60            (int) ((self::load_4(self::substr($key, 0, 4))) & 0x3ffffff),61            (int) ((self::load_4(self::substr($key, 3, 4)) >> 2) & 0x3ffff03),62            (int) ((self::load_4(self::substr($key, 6, 4)) >> 4) & 0x3ffc0ff),63            (int) ((self::load_4(self::substr($key, 9, 4)) >> 6) & 0x3f03fff),64            (int) ((self::load_4(self::substr($key, 12, 4)) >> 8) & 0x00fffff)65        );66 67        /* h = 0 */68        $this->h = array(0, 0, 0, 0, 0);69 70        /* save pad for later */71        $this->pad = array(72            self::load_4(self::substr($key, 16, 4)),73            self::load_4(self::substr($key, 20, 4)),74            self::load_4(self::substr($key, 24, 4)),75            self::load_4(self::substr($key, 28, 4)),76        );77 78        $this->leftover = 0;79        $this->final = false;80    }81 82    /**83     * Zero internal buffer upon destruction84     */85    public function __destruct()86    {87        $this->r[0] ^= $this->r[0];88        $this->r[1] ^= $this->r[1];89        $this->r[2] ^= $this->r[2];