MomO :: Unity3D 에서 XML 사용과 암호화

2012/01/28 10:51

Unity3D 에서 XML 사용과 암호화 생활수단/Unity3D2012/01/28 10:51

1. Encrypt
     //-----------------------------------------------------------------------------
    public static void SerializeEncryptObject(string path, object obj, System.Type type, SymmetricAlgorithm key)
    {
        using(FileStream fs = File.Open(path, FileMode.Create, FileAccess.Write, FileShare.None))
        {
            using(CryptoStream cs = new CryptoStream(fs, key.CreateEncryptor(), CryptoStreamMode.Write))
            {
                using(StreamWriter sw = new StreamWriter(cs, Encoding.UTF8))
                {
                    try
                    {
                        XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                        ns.Add("", "");

                        XmlSerializer serializer = new XmlSerializer(type);
serializer.Serialize(sw, obj, ns);
                    }
                    catch (System.Exception ex)
                    {
                        Debug.LogWarning(ex.ToString());
                    }
                    finally
                    {
                        sw.Close();
                        cs.Close();
                        fs.Close();
                    }
                }
            }
        }
    }

2. Decrypt
    //-----------------------------------------------------------------------------
    public static string LoadXmlFromEncryptFile(string _filePath, SymmetricAlgorithm key)
    {
        if (File.Exists(_filePath) == false)
        {
            _deserializeErrorString = System.String.Format("File({0}) does not exists", _filePath);
            return "";
        }

        using(FileStream fs = File.Open(_filePath, FileMode.Open))
        {
            using(CryptoStream cs = new CryptoStream(fs, key.CreateDecryptor(), CryptoStreamMode.Read))
            {
                using(StreamReader sr = new StreamReader(cs, Encoding.UTF8))
                {
                    try
                    {
                        return sr.ReadToEnd();
                    }
                    catch(System.Exception ex)
                    {
                        Debug.LogWarning(ex.ToString());
                        _deserializeErrorString = ex.ToString();
                    }
                    finally
                    {
                        sr.Close();
                        cs.Close();
                        fs.Close();
                    }
                }
            }
        }

        return "";
    }

3. Usage
-
private readonly string SECRET_KEY = "12345678";    // must be 64bit, 8bytes
-
private System.Security.Cryptography.DESCryptoServiceProvider mCryptoProvider = null;
-
mCryptoProvider = new System.Security.Cryptography.DESCryptoServiceProvider();
mCryptoProvider.Key = System.Text.ASCIIEncoding.ASCII.GetBytes(SECRET_KEY);        mCryptoProvider.IV = System.Text.ASCIIEncoding.ASCII.GetBytes(SECRET_KEY);

-
SerializeEncryptObject("FilePath", Type, mCryptoProvider);
string xmlString = LoadXmlFromEncryptFile("FilePath", mCryptoProvider);