private void Init()
{
if (_unlocked)
{
return;
}
FileInfo file = new FileInfo(ManifestFile);
NSDictionary rootDict = (NSDictionary)PropertyListParser.Parse(file);
NSData backupKeyBag = (NSData)rootDict.ObjectForKey("BackupKeyBag");
_keybag = new KeyBag(backupKeyBag);
NSData manifestKeyObject = (NSData)rootDict.ObjectForKey("ManifestKey");
if (manifestKeyObject == null)
{
throw new Exception("Could not find ManifestKey. Is this an encrypted backup?");
}
var manifestKey = manifestKeyObject.Bytes.Skip(4).ToArray();
var manifestClass = (int)StructConverter.Unpack("<l", manifestKeyObject.Bytes.Take(4).ToArray())[0];
_keybag.UnlockWithPassphrase(_passPhrase);
var key = _keybag.UnwrapKeyForClass(manifestClass, manifestKey);
var encryptedDb = File.ReadAllBytes(ManifestDb);
var decryptedData = EncryptionHelper.DecryptAES(encryptedDb, key, CipherMode.CBC);
File.WriteAllBytes($"{_tempFilePath}\\Manifest.db", decryptedData);
if (!_repository.OpenTempDb())
{
throw new Exception("Manifest.db file does not seem to be the right format!");
}
_unlocked = true;
}
private ulong Unpack64Bit(byte[] bytes)
{
return((ulong)StructConverter.Unpack(">Q", bytes.Reverse().ToArray())[0]);
}
private static int GetInt(byte[] bytes)
{
return((int)(uint)StructConverter.Unpack(">L", bytes.Reverse().ToArray())[0]);
}
private byte[] Pack64Bit(ulong l)
{
return(StructConverter.Pack(new object[] { l }));
}