public void save(string filename = null)
{
if (saveFolders == null)
{
saveFolders = new List <string> ();
return;
}
// Serializing data
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, data);
// Encrypt serialized data
byte[] cipherData = null;
cipherData = useAESEncryption ? AESEncryption.encrypt(ms.ToArray(), aesPassword, aesSalt) : ms.ToArray();
if (filename == null)
{
filename = defaultFilename;
}
// Compute hmac to lock data on specific device
string hmac = "";
if (useHMAC)
{
hmac = Digest.computeHMACSHA1(cipherData, SystemInfo.deviceUniqueIdentifier);
}
foreach (string folder in saveFolders)
{
// Write encrypted data
FileStream fs = File.Create(folder + filename);
fs.Write(cipherData, 0, cipherData.Length);
fs.Close();
if (useHMAC)
{
fs = File.Create(folder + filename + ".hash");
fs.Close();
StreamWriter sw = new StreamWriter(folder + filename + ".hash", false);
sw.WriteLine(hmac);
sw.Close();
}
}
}
public bool load(string filename = null)
{
if (saveFolders == null)
{
reset();
Debug.Log("No save folder defined");
return(false);
}
if (filename == null)
{
filename = defaultFilename;
}
bool successLoad = false;
foreach (string folder in saveFolders)
{
// Read encrypted data
string path = folder + filename;
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
FileStream fs = File.Open(path, FileMode.OpenOrCreate);
byte[] cipherData = new byte[fs.Length];
fs.Read(cipherData, 0, (int)fs.Length);
fs.Close();
if (cipherData.Length == 0)
{
reset();
Debug.Log("No Such a file at:" + path);
}
else
{
// Verify that loaded data is from valid device
string hmac = Digest.computeHMACSHA1(cipherData, SystemInfo.deviceUniqueIdentifier);
string hmacPath = folder + filename + ".hash";
string storedHmac = "";
if (!useHMAC || File.Exists(hmacPath))
{
if (useHMAC)
{
StreamReader sr = File.OpenText(hmacPath);
storedHmac = sr.ReadLine();
}
if (!useHMAC || hmac == storedHmac)
{
// Decrypt encrypted data
byte[] plainData = null;
plainData = useAESEncryption ? AESEncryption.decrypt(cipherData, aesPassword, aesSalt) : cipherData;
// Deserialized decrypted data
try {
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream(plainData);
data = (Hashtable)bf.Deserialize(ms);
successLoad = true;
break;
} catch (SerializationException) {
reset();
Debug.Log("Can't deserialize data at:" + path);
}
}
else
{
// Invalid device, erase the data
reset();
Debug.Log("File has been corrupted:" + path);
}
}
else
{
reset();
Debug.Log("Hmac for this data has been lost;" + path);
}
}
}
return(successLoad);
}
