internal static byte[] DecryptData(string key, string encryptedInput)
{
byte[] array;
try
{
array = Convert.FromBase64String(encryptedInput);
}
catch (Exception)
{
ObscuredPrefs.SavesTampered();
byte[] result = null;
return(result);
}
if (array.Length <= 0)
{
ObscuredPrefs.SavesTampered();
return(null);
}
int num = array.Length;
byte b = array[num - 6];
if (b != 2)
{
ObscuredPrefs.SavesTampered();
return(null);
}
ObscuredPrefs.DeviceLockLevel deviceLockLevel = (ObscuredPrefs.DeviceLockLevel)array[num - 5];
byte[] array2 = new byte[4];
Buffer.BlockCopy(array, num - 4, array2, 0, 4);
uint num2 = (uint)((int)array2[0] | (int)array2[1] << 8 | (int)array2[2] << 16 | (int)array2[3] << 24);
uint num3 = 0u;
int num4;
if (deviceLockLevel != ObscuredPrefs.DeviceLockLevel.None)
{
num4 = num - 11;
if (ObscuredPrefs.lockToDevice != ObscuredPrefs.DeviceLockLevel.None)
{
byte[] array3 = new byte[4];
Buffer.BlockCopy(array, num4, array3, 0, 4);
num3 = (uint)((int)array3[0] | (int)array3[1] << 8 | (int)array3[2] << 16 | (int)array3[3] << 24);
}
}
else
{
num4 = num - 7;
}
byte[] array4 = new byte[num4];
Buffer.BlockCopy(array, 0, array4, 0, num4);
byte[] array5 = ObscuredPrefs.EncryptDecryptBytes(array4, num4, key + ObscuredPrefs.cryptoKey);
uint num5 = xxHash.CalculateHash(array5, num4, 0u);
if (num5 != num2)
{
ObscuredPrefs.SavesTampered();
return(null);
}
if (ObscuredPrefs.lockToDevice == ObscuredPrefs.DeviceLockLevel.Strict && num3 == 0u && !ObscuredPrefs.emergencyMode && !ObscuredPrefs.readForeignSaves)
{
return(null);
}
if (num3 != 0u && !ObscuredPrefs.emergencyMode)
{
uint num6 = ObscuredPrefs.DeviceIdHash;
if (num3 != num6)
{
ObscuredPrefs.PossibleForeignSavesDetected();
if (!ObscuredPrefs.readForeignSaves)
{
return(null);
}
}
}
return(array5);
}
private static byte[] DecryptData(string key, string encryptedInput)
{
byte[] numArray1;
try
{
numArray1 = Convert.FromBase64String(encryptedInput);
}
catch (Exception ex)
{
ObscuredPrefs.SavesTampered();
return((byte[])null);
}
if (numArray1.Length <= 0)
{
ObscuredPrefs.SavesTampered();
return((byte[])null);
}
int length1 = numArray1.Length;
if ((int)numArray1[length1 - 6] != 2)
{
ObscuredPrefs.SavesTampered();
return((byte[])null);
}
ObscuredPrefs.DeviceLockLevel deviceLockLevel = (ObscuredPrefs.DeviceLockLevel)numArray1[length1 - 5];
byte[] numArray2 = new byte[4];
Buffer.BlockCopy((Array)numArray1, length1 - 4, (Array)numArray2, 0, 4);
uint num1 = (uint)((int)numArray2[0] | (int)numArray2[1] << 8 | (int)numArray2[2] << 16 | (int)numArray2[3] << 24);
uint num2 = 0;
int length2;
if (deviceLockLevel != ObscuredPrefs.DeviceLockLevel.None)
{
length2 = length1 - 11;
if (ObscuredPrefs.lockToDevice != ObscuredPrefs.DeviceLockLevel.None)
{
byte[] numArray3 = new byte[4];
Buffer.BlockCopy((Array)numArray1, length2, (Array)numArray3, 0, 4);
num2 = (uint)((int)numArray3[0] | (int)numArray3[1] << 8 | (int)numArray3[2] << 16 | (int)numArray3[3] << 24);
}
}
else
{
length2 = length1 - 7;
}
byte[] bytes = new byte[length2];
Buffer.BlockCopy((Array)numArray1, 0, (Array)bytes, 0, length2);
byte[] buf = ObscuredPrefs.EncryptDecryptBytes(bytes, length2, key + ObscuredPrefs.encryptionKey);
if ((int)xxHash.CalculateHash(buf, length2, 0U) != (int)num1)
{
ObscuredPrefs.SavesTampered();
return((byte[])null);
}
if (ObscuredPrefs.lockToDevice == ObscuredPrefs.DeviceLockLevel.Strict && (int)num2 == 0 && (!ObscuredPrefs.emergencyMode && !ObscuredPrefs.readForeignSaves))
{
return((byte[])null);
}
if ((int)num2 != 0 && !ObscuredPrefs.emergencyMode)
{
uint deviceIdHash = ObscuredPrefs.DeviceIdHash;
if ((int)num2 != (int)deviceIdHash)
{
ObscuredPrefs.PossibleForeignSavesDetected();
if (!ObscuredPrefs.readForeignSaves)
{
return((byte[])null);
}
}
}
return(buf);
}
private static string DeprecatedDecryptValue(string value)
{
string[] array = value.Split(new char[]
{
':'
});
if (array.Length < 2)
{
ObscuredPrefs.SavesTampered();
return(string.Empty);
}
string text = array[0];
string a = array[1];
byte[] array2;
try
{
array2 = Convert.FromBase64String(text);
}
catch
{
ObscuredPrefs.SavesTampered();
return(string.Empty);
}
string @string = Encoding.UTF8.GetString(array2, 0, array2.Length);
string result = ObscuredString.EncryptDecrypt(@string, ObscuredPrefs.cryptoKey);
if (array.Length == 3)
{
if (a != ObscuredPrefs.DeprecatedCalculateChecksum(text + ObscuredPrefs.DeprecatedDeviceId))
{
ObscuredPrefs.SavesTampered();
}
}
else if (array.Length == 2)
{
if (a != ObscuredPrefs.DeprecatedCalculateChecksum(text))
{
ObscuredPrefs.SavesTampered();
}
}
else
{
ObscuredPrefs.SavesTampered();
}
if (ObscuredPrefs.lockToDevice != ObscuredPrefs.DeviceLockLevel.None && !ObscuredPrefs.emergencyMode)
{
if (array.Length >= 3)
{
string a2 = array[2];
if (a2 != ObscuredPrefs.DeprecatedDeviceId)
{
if (!ObscuredPrefs.readForeignSaves)
{
result = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
}
else if (ObscuredPrefs.lockToDevice == ObscuredPrefs.DeviceLockLevel.Strict)
{
if (!ObscuredPrefs.readForeignSaves)
{
result = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
else if (a != ObscuredPrefs.DeprecatedCalculateChecksum(text))
{
if (!ObscuredPrefs.readForeignSaves)
{
result = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
}
return(result);
}
private static string DeprecatedDecryptValue(string value)
{
string[] strArray = value.Split(':');
if (strArray.Length < 2)
{
ObscuredPrefs.SavesTampered();
return(string.Empty);
}
string str1 = strArray[0];
string str2 = strArray[1];
byte[] bytes;
try
{
bytes = Convert.FromBase64String(str1);
}
catch
{
ObscuredPrefs.SavesTampered();
return(string.Empty);
}
string str3 = ObscuredString.EncryptDecrypt(Encoding.UTF8.GetString(bytes, 0, bytes.Length), ObscuredPrefs.encryptionKey);
if (strArray.Length == 3)
{
if (str2 != ObscuredPrefs.DeprecatedCalculateChecksum(str1 + ObscuredPrefs.DeprecatedDeviceId))
{
ObscuredPrefs.SavesTampered();
}
}
else if (strArray.Length == 2)
{
if (str2 != ObscuredPrefs.DeprecatedCalculateChecksum(str1))
{
ObscuredPrefs.SavesTampered();
}
}
else
{
ObscuredPrefs.SavesTampered();
}
if (ObscuredPrefs.lockToDevice != ObscuredPrefs.DeviceLockLevel.None && !ObscuredPrefs.emergencyMode)
{
if (strArray.Length >= 3)
{
if (strArray[2] != ObscuredPrefs.DeprecatedDeviceId)
{
if (!ObscuredPrefs.readForeignSaves)
{
str3 = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
}
else if (ObscuredPrefs.lockToDevice == ObscuredPrefs.DeviceLockLevel.Strict)
{
if (!ObscuredPrefs.readForeignSaves)
{
str3 = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
else if (str2 != ObscuredPrefs.DeprecatedCalculateChecksum(str1))
{
if (!ObscuredPrefs.readForeignSaves)
{
str3 = string.Empty;
}
ObscuredPrefs.PossibleForeignSavesDetected();
}
}
return(str3);
}
