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Editing: Ctx.php
<?php if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) { return; } /** * Class ParagonIE_Sodium_Core_ChaCha20_Ctx */ class ParagonIE_Sodium_Core_ChaCha20_Ctx extends ParagonIE_Sodium_Core_Util implements ArrayAccess { /** * @var SplFixedArray internally, <int, int> */ protected $container; /** * ParagonIE_Sodium_Core_ChaCha20_Ctx constructor. * * @internal You should not use this directly from another application * * @param string $key ChaCha20 key. * @param string $iv Initialization Vector (a.k.a. nonce). * @param string $counter The initial counter value. * Defaults to 8 0x00 bytes. * @throws InvalidArgumentException * @throws TypeError */ public function __construct($key = '', $iv = '', $counter = '') { if (self::strlen($key) !== 32) { throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.'); } if (self::strlen($iv) !== 8) { throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.'); } $this->container = new SplFixedArray(16); /* "expand 32-byte k" as per ChaCha20 spec */ $this->container[0] = 0x61707865; $this->container[1] = 0x3320646e; $this->container[2] = 0x79622d32; $this->container[3] = 0x6b206574; $this->container[4] = self::load_4(self::substr($key, 0, 4)); $this->container[5] = self::load_4(self::substr($key, 4, 4)); $this->container[6] = self::load_4(self::substr($key, 8, 4)); $this->container[7] = self::load_4(self::substr($key, 12, 4)); $this->container[8] = self::load_4(self::substr($key, 16, 4)); $this->container[9] = self::load_4(self::substr($key, 20, 4)); $this->container[10] = self::load_4(self::substr($key, 24, 4)); $this->container[11] = self::load_4(self::substr($key, 28, 4)); $counter = $this->initCounter($counter); $this->container[12] = self::load_4(self::substr($counter, 0, 4)); $this->container[13] = self::load_4(self::substr($counter, 4, 4)); $this->container[14] = self::load_4(self::substr($iv, 0, 4)); $this->container[15] = self::load_4(self::substr($iv, 4, 4)); } /** * @internal You should not use this directly from another application * * @param int $offset * @param int $value * @return void * @psalm-suppress MixedArrayOffset */ #[ReturnTypeWillChange] public function offsetSet($offset, $value) { if (!is_int($offset)) { throw new InvalidArgumentException('Expected an integer'); } if (!is_int($value)) { throw new InvalidArgumentException('Expected an integer'); } $this->container[$offset] = $value; } /** * @internal You should not use this directly from another application * * @param int $offset * @return bool */ #[ReturnTypeWillChange] public function offsetExists($offset) { return isset($this->container[$offset]); } /** * @internal You should not use this directly from another application * * @param int $offset * @return void * @psalm-suppress MixedArrayOffset */ #[ReturnTypeWillChange] public function offsetUnset($offset) { unset($this->container[$offset]); } /** * @internal You should not use this directly from another application * * @param int $offset * @return mixed|null * @psalm-suppress MixedArrayOffset */ #[ReturnTypeWillChange] public function offsetGet($offset) { return isset($this->container[$offset]) ? $this->container[$offset] : null; } /** * Initialize (pad) a counter value. * @throws SodiumException * * @param string $ctr * @return string */ public function initCounter( #[SensitiveParameter] $ctr ) { $len = self::strlen($ctr); if ($len === 0) { return str_repeat("\0", 8); } if ($len < 8) { return $ctr . str_repeat("\0", 8 - $len); } if ($len > 8) { throw new SodiumException("counter cannot be more than 8 bytes"); } return $ctr; } }
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