private void OnGotHash(HashGeneratorResult result)
{
if (!result.Success)
{
this.callback(null);
}
else
{
this.callback(result.SummaryHash);
}
}
private void OnGotHash(HashGeneratorResult result)
{
if (!result.Success)
{
status = "Error: " + result.ErrorMessage;
return;
}
var filePath = Path.Combine(Path.GetFullPath(Application.dataPath + @"\..\"), FileName);
if (!File.Exists(filePath))
{
status = "No super secret file found, you're cheater!\n" + filePath;
return;
}
var allBytes = File.ReadAllBytes(filePath);
var allChars = BytesToUnicodeChars(allBytes);
var decrypted = ObscuredString.Decrypt(allChars, StringKey);
var separatorIndex = decrypted.IndexOf(Separator, StringComparison.InvariantCulture);
if (separatorIndex == -1)
{
status = "Super secret file is corrupted, you're cheater!";
return;
}
var whitelistedHashes = decrypted.Split(new[] { Separator }, StringSplitOptions.RemoveEmptyEntries);
var originalSummaryHash = whitelistedHashes[0];
// compare summary hashes first
if (originalSummaryHash != result.SummaryHash)
{
// check all files against whitelisted hashes if summary differs
// (it can differ if some files are absent due to build separation)
for (var i = 1; i < whitelistedHashes.Length; i++)
{
var hash = whitelistedHashes[i];
if (!result.HasFileHash(hash))
{
status = "Code hash differs, you're cheater!\nSummary hashes:\n" + originalSummaryHash + "\n" + result.SummaryHash + "\nWhitelisted hashes count: " + whitelistedHashes.Length;
return;
}
}
}
status = "All fine!";
}
private void OnGotHash(HashGeneratorResult result)
{
if (!result.Success)
{
status = "Error: " + result.ErrorMessage;
return;
}
var resultingHash = result.CodeHash;
var filePath = Path.Combine(Path.GetFullPath(Application.dataPath + @"\..\"), FileName);
if (!File.Exists(filePath))
{
status = "No super secret file found, you're cheater!\n" + filePath;
return;
}
var allBytes = File.ReadAllBytes(filePath);
var allChars = BytesToUnicodeChars(allBytes);
var decrypted = ObscuredString.Decrypt(allChars, StringKey);
var separatorIndex = decrypted.IndexOf(Separator, StringComparison.InvariantCulture);
if (separatorIndex == -1)
{
status = "Super secret file is corrupted, you're cheater!";
return;
}
var buildHash = decrypted.Substring(0, separatorIndex);
var fileHash = decrypted.Substring(separatorIndex + SeparatorLength);
var currentFileHash = GetHash(buildHash + HashSalt);
if (currentFileHash != fileHash)
{
status = "Super secret file is corrupted, you're cheater!";
return;
}
if (buildHash != resultingHash)
{
status = "Code hash differs, you're cheater!\n" + resultingHash + "\n" + buildHash;
return;
}
status = "All fine!";
}
private void OnHashGenerated(HashGeneratorResult result)
{
LastResult = result;
CodeHashGenerator.HashGenerated -= OnHashGenerated;
if (result.Success)
{
// Here you can upload your hashes to the server to make a validation check on the server side and punish cheater with server logic.
//
// This is a preferred use case since cheater will have to figure out proper hash using
// packets sniffing (https packets harder to sniff) or debugging first to fake it on the client side requiring more
// skills and motivation from cheater.
//
// check SummaryHash first and if it differs (it can if your runtime build has only portion of the initial build you made in Unity)
// check FileHashes if SummaryHash differs to see if runtime build have any new hashes - it will indicate build is altered
//
// UploadHashes(result.SummaryHash, result.FileHashes);
// Or you may compare it with hardcoded hashes if you did save them somewhere in the build previously.
//
// This is less preferred way since cheater can still try to hack your client-side validation check to make it always pass.
// Anyways, this is better than nothing and will require some additional time from cheater reducing overall motivation to hack your game.
// In case implementing it fully on the client side, make sure to compile IL2CPP build and use code
// obfuscation which runs integrated into the Unity build process so hashing will happen AFTER code obfuscation.
// If obfuscation will happen after hashing it will change code hash and you'll need to re-calculate it
// using Tools > Code Stage > Anti-Cheat Toolkit > Calculate external build hash feature.
//
// if (!CompareHashes(result.SummaryHash, result.FileHashes))
// {
// Debug.Log("You patched my code, cheater!");
// }
}
else
{
Debug.LogError("Oh, something went wrong while getting the hash!\n" +
"Error message: " + result.ErrorMessage);
}
}
protected virtual void Complete(HashGeneratorResult result)
{
Result = result;
IsBusy = false;
}
