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ChaCha20
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<?php if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) { return; } class ParagonIE_Sodium_Core_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core_ChaCha20_Ctx { public function __construct($key = '', $iv = '', $counter = '') { if (self::strlen($iv) !== 12) { throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.'); } parent::__construct($key, self::substr($iv, 0, 8), $counter); if (!empty($counter)) { $this->container[12] = self::load_4(self::substr($counter, 0, 4)); } $this->container[13] = self::load_4(self::substr($iv, 0, 4)); $this->container[14] = self::load_4(self::substr($iv, 4, 4)); $this->container[15] = self::load_4(self::substr($iv, 8, 4)); } }