Tiny File Manager

Back Back Up Advanced Editor

<?php

class ParagonIE_Sodium_Core32_SecretStream_State
{
    protected $key;
    protected $counter;
    protected $nonce;
    protected $_pad;
    public function __construct($key, $nonce = null)
    {
        $this->key = $key;
        $this->counter = 1;
        if (is_null($nonce)) {
            $nonce = str_repeat("\0", 12);
        }
        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);
        $this->_pad = str_repeat("\0", 4);
    }
    public function counterReset()
    {
        $this->counter = 1;
        $this->_pad = str_repeat("\0", 4);
        return $this;
    }
    public function getKey()
    {
        return $this->key;
    }
    public function getCounter()
    {
        return ParagonIE_Sodium_Core32_Util::store32_le($this->counter);
    }
    public function getNonce()
    {
        if (!is_string($this->nonce)) {
            $this->nonce = str_repeat("\0", 12);
        }
        if (ParagonIE_Sodium_Core32_Util::strlen($this->nonce) !== 12) {
            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);
        }
        return $this->nonce;
    }
    public function getCombinedNonce()
    {
        return $this->getCounter() . ParagonIE_Sodium_Core32_Util::substr($this->getNonce(), 0, 8);
    }
    public function incrementCounter()
    {
        ++$this->counter;
        return $this;
    }
    public function needsRekey()
    {
        return ($this->counter & 0xffff) === 0;
    }
    public function rekey($newKeyAndNonce)
    {
        $this->key = ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 0, 32);
        $this->nonce = str_pad(ParagonIE_Sodium_Core32_Util::substr($newKeyAndNonce, 32), 12, "\0", STR_PAD_RIGHT);
        return $this;
    }
    public function xorNonce($str)
    {
        $this->nonce = ParagonIE_Sodium_Core32_Util::xorStrings($this->getNonce(), str_pad(ParagonIE_Sodium_Core32_Util::substr($str, 0, 8), 12, "\0", STR_PAD_RIGHT));
        return $this;
    }
    public static function fromString($string)
    {
        $state = new ParagonIE_Sodium_Core32_SecretStream_State(ParagonIE_Sodium_Core32_Util::substr($string, 0, 32));
        $state->counter = ParagonIE_Sodium_Core32_Util::load_4(ParagonIE_Sodium_Core32_Util::substr($string, 32, 4));
        $state->nonce = ParagonIE_Sodium_Core32_Util::substr($string, 36, 12);
        $state->_pad = ParagonIE_Sodium_Core32_Util::substr($string, 48, 8);
        return $state;
    }
    public function toString()
    {
        return $this->key . $this->getCounter() . $this->nonce . $this->_pad;
    }
}