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<?php

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if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) {

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return;

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}

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/**

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* Class ParagonIE_Sodium_Core_ChaCha20_Ctx

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class ParagonIE_Sodium_Core_ChaCha20_Ctx extends ParagonIE_Sodium_Core_Util implements ArrayAccess

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{

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/**

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* @var SplFixedArray internally, <int, int>

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protected $container;

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/**

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* ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.

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* @internal You should not use this directly from another application

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* @param string $key ChaCha20 key.

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* @param string $iv Initialization Vector (a.k.a. nonce).

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* @param string $counter The initial counter value.

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* Defaults to 8 0x00 bytes.

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* @throws InvalidArgumentException

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* @throws TypeError

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public function __construct($key = '', $iv = '', $counter = '')

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{

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if (self::strlen($key) !== 32) {

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throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');

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}

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if (self::strlen($iv) !== 8) {

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throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');

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}

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$this->container = new SplFixedArray(16);

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/* "expand 32-byte k" as per ChaCha20 spec */

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$this->container[0] = 0x61707865;

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$this->container[1] = 0x3320646e;

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$this->container[2] = 0x79622d32;

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$this->container[3] = 0x6b206574;

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$this->container[4] = self::load_4(self::substr($key, 0, 4));

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$this->container[5] = self::load_4(self::substr($key, 4, 4));

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$this->container[6] = self::load_4(self::substr($key, 8, 4));

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$this->container[7] = self::load_4(self::substr($key, 12, 4));

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$this->container[8] = self::load_4(self::substr($key, 16, 4));

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$this->container[9] = self::load_4(self::substr($key, 20, 4));

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$this->container[10] = self::load_4(self::substr($key, 24, 4));

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$this->container[11] = self::load_4(self::substr($key, 28, 4));

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if (empty($counter)) {

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$this->container[12] = 0;

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$this->container[13] = 0;

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} else {

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$this->container[12] = self::load_4(self::substr($counter, 0, 4));

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$this->container[13] = self::load_4(self::substr($counter, 4, 4));

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}

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$this->container[14] = self::load_4(self::substr($iv, 0, 4));

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$this->container[15] = self::load_4(self::substr($iv, 4, 4));

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}

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/**

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* @internal You should not use this directly from another application

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* @param int $offset

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* @param int $value

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* @return void

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* @psalm-suppress MixedArrayOffset

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#[ReturnTypeWillChange]

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public function offsetSet($offset, $value)

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{

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if (!is_int($offset)) {

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throw new InvalidArgumentException('Expected an integer');

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}

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if (!is_int($value)) {

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throw new InvalidArgumentException('Expected an integer');

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}

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$this->container[$offset] = $value;

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}

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/**

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* @internal You should not use this directly from another application

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* @param int $offset

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* @return bool

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#[ReturnTypeWillChange]

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public function offsetExists($offset)

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{

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return isset($this->container[$offset]);

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}

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/**

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* @internal You should not use this directly from another application

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* @param int $offset

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* @return void

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* @psalm-suppress MixedArrayOffset

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#[ReturnTypeWillChange]

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public function offsetUnset($offset)

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{

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unset($this->container[$offset]);

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}

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/**

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* @internal You should not use this directly from another application

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* @param int $offset

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* @return mixed|null

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* @psalm-suppress MixedArrayOffset

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#[ReturnTypeWillChange]

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public function offsetGet($offset)

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{

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return isset($this->container[$offset])

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? $this->container[$offset]

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: null;

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}

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}

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