ParagonIE_Sodium_Core32_SecretStream_State

6class ParagonIE_Sodium_Core32_SecretStream_State7{8    /** @var string $key */9    protected $key;10 11    /** @var int $counter */12    protected $counter;13 14    /** @var string $nonce */15    protected $nonce;16 17    /** @var string $_pad */18    protected $_pad;19 20    /**21     * ParagonIE_Sodium_Core32_SecretStream_State constructor.22     * @param string $key23     * @param string|null $nonce24     */25    public function __construct($key, $nonce = null)26    {27        $this->key = $key;28        $this->counter = 1;29        if (is_null($nonce)) {30            $nonce = str_repeat("\0", 12);31        }32        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;33        $this->_pad = str_repeat("\0", 4);34    }35 36    /**37     * @return self38     */39    public function counterReset()40    {41        $this->counter = 1;42        $this->_pad = str_repeat("\0", 4);43        return $this;44    }45 46    /**47     * @return string48     */49    public function getKey()50    {51        return $this->key;52    }53 54    /**55     * @return string56     */57    public function getCounter()58    {59        return ParagonIE_Sodium_Core32_Util::store32_le($this->counter);60    }61 62    /**63     * @return string64     */65    public function getNonce()66    {67        if (!is_string($this->nonce)) {68            $this->nonce = str_repeat("\0", 12);69        }70        if (ParagonIE_Sodium_Core32_Util::strlen($this->nonce) !== 12) {71            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);72        }73        return $this->nonce;74    }75 76    /**77     * @return string78     */79    public function getCombinedNonce()80    {81        return $this->getCounter() .82            ParagonIE_Sodium_Core32_Util::substr($this->getNonce(), 0, 8);83    }84 85    /**