<?php

[0] Fix | Delete

[1] Fix | Delete

/**

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* Class ParagonIE_Sodium_Core_SecretStream_State

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*/

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class ParagonIE_Sodium_Core_SecretStream_State

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{

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/** @var string $key */

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protected $key;

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/** @var int $counter */

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protected $counter;

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/** @var string $nonce */

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protected $nonce;

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/** @var string $_pad */

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protected $_pad;

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/**

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* ParagonIE_Sodium_Core_SecretStream_State constructor.

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* @param string $key

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* @param string|null $nonce

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*/

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public function __construct($key, $nonce = null)

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{

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$this->key = $key;

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$this->counter = 1;

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if (is_null($nonce)) {

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$nonce = str_repeat("\0", 12);

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}

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$this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;

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$this->_pad = str_repeat("\0", 4);

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}

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/**

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* @return self

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*/

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public function counterReset()

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{

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$this->counter = 1;

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$this->_pad = str_repeat("\0", 4);

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return $this;

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}

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/**

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* @return string

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*/

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public function getKey()

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{

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return $this->key;

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}

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/**

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* @return string

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*/

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public function getCounter()

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{

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return ParagonIE_Sodium_Core_Util::store32_le($this->counter);

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}

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/**

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* @return string

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*/

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public function getNonce()

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{

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if (!is_string($this->nonce)) {

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$this->nonce = str_repeat("\0", 12);

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}

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if (ParagonIE_Sodium_Core_Util::strlen($this->nonce) !== 12) {

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$this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);

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}

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return $this->nonce;

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}

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/**

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* @return string

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*/

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public function getCombinedNonce()

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{

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return $this->getCounter() .

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ParagonIE_Sodium_Core_Util::substr($this->getNonce(), 0, 8);

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}

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/**

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* @return self

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*/

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public function incrementCounter()

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{

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++$this->counter;

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return $this;

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}

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/**

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* @return bool

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*/

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public function needsRekey()

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{

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return ($this->counter & 0xffff) === 0;

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}

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/**

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* @param string $newKeyAndNonce

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* @return self

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*/

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public function rekey($newKeyAndNonce)

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{

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$this->key = ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 0, 32);

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$this->nonce = str_pad(

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ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 32),

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12,

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"\0",

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STR_PAD_RIGHT

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);

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return $this;

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}

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/**

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* @param string $str

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* @return self

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*/

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public function xorNonce($str)

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{

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$this->nonce = ParagonIE_Sodium_Core_Util::xorStrings(

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$this->getNonce(),

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str_pad(

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ParagonIE_Sodium_Core_Util::substr($str, 0, 8),

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12,

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"\0",

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STR_PAD_RIGHT

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)

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);

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return $this;

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}

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/**

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* @param string $string

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* @return self

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*/

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public static function fromString($string)

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{

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$state = new ParagonIE_Sodium_Core_SecretStream_State(

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ParagonIE_Sodium_Core_Util::substr($string, 0, 32)

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);

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$state->counter = ParagonIE_Sodium_Core_Util::load_4(

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ParagonIE_Sodium_Core_Util::substr($string, 32, 4)

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);

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$state->nonce = ParagonIE_Sodium_Core_Util::substr($string, 36, 12);

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$state->_pad = ParagonIE_Sodium_Core_Util::substr($string, 48, 8);

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return $state;

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}

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/**

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* @return string

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*/

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public function toString()

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{

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return $this->key .

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$this->getCounter() .

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$this->nonce .

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$this->_pad;

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}

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}

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