/// <summary>
/// Saves the config file encrypted using the passed key
/// </summary>
/// <param name="filePath">The path to the file where to save the configuration</param>
/// <param name="key">The key for encrypting the file</param>
/// <exception cref="ConfigException">Something went wrong while encryption (Unknown)</exception>
/// <exception cref="Exception">All exception that can be passed on by File.WriteAllBytes called with the filePath</exception>
public void SaveConfig(string filePath, string key)
{
// Generates the object that will be saved as the config file
JObject json = new JObject()
{
["port"] = this.Port,
["host"] = this.Host,
["rsa"] = SimpleSecurityUtils.SaveRSAToJson(this.PrivateKey)
};
// Generates the actual key and iv from the previous plain text key
byte[] aesKey = SimpleSecurityUtils.HashSHA256(Encoding.UTF8.GetBytes(key));
byte[] aesIv = SimpleSecurityUtils.HashMD5(Encoding.UTF8.GetBytes(key));
// Encryptes the config-json object
byte[] encData = SimpleSecurityUtils.EncryptAES(Encoding.UTF8.GetBytes(json.ToString()), aesKey, aesIv);
// Checks if the encryption failed
if (encData == null)
{
// Unknown exception
throw new ConfigException();
}
// Writes all data to the file
File.WriteAllBytes(filePath, encData);
}
/// <summary>
/// Loads the given config-file, decryptes it using the passed key and loads it as a config object
/// </summary>
/// <param name="filePath">The path to the configuration file.</param>
/// <param name="key">The key to decrypt those bytes</param>
/// <returns>The fully loaded config</returns>
/// <exception cref="ConfigInvalidKeyException">If the given key couldn't decrypt the config</exception>
/// <exception cref="ConfigCurruptedException">If the config seems to be currupted</exception>
/// <exception cref="Exception">All exception that can be passed by File.ReadAllBytes using the filepath.</exception>
public static Config LoadConfig(string filePath, string key)
{
// Reads the content of the passed config file
byte[] rawData = File.ReadAllBytes(filePath);
// Generates the actual key and iv from the previous plain text key
byte[] aesKey = SimpleSecurityUtils.HashSHA256(Encoding.UTF8.GetBytes(key));
byte[] aesIv = SimpleSecurityUtils.HashMD5(Encoding.UTF8.GetBytes(key));
// Tries to decrypt the config
byte[] decrypted = SimpleSecurityUtils.DecryptAES(rawData, aesKey, aesIv);
// Checks if the decryption failed
if (decrypted == null)
{
throw new ConfigInvalidKeyException();
}
try
{
// The config that will be created
Config cfg = new Config();
// Tries to parse the config from json
JObject json = JObject.Parse(Encoding.UTF8.GetString(decrypted));
// Gets all values
cfg.Port = (int)json["port"];
cfg.Host = (string)json["host"] ?? string.Empty;
cfg.PrivateKey = SimpleSecurityUtils.LoadRSAFromJson((JObject)json["rsa"]);
// Returns the fully loaded config
return(cfg);
}
catch
{
throw new ConfigCurruptedException(Encoding.UTF8.GetString(decrypted));
}
}
