ParagonIE\Halite\Symmetric\EncryptionKey::__construct PHP Method

    public function __construct(HiddenString $keyMaterial)
    {
        if (CryptoUtil::safeStrlen($keyMaterial->getString()) !== \Sodium\CRYPTO_STREAM_KEYBYTES) {
            throw new InvalidKey('Encryption key must be CRYPTO_STREAM_KEYBYTES bytes long');
        }
        parent::__construct($keyMaterial);
    }