private static void FindProviders(CMFApplication app)
{
Providers[app] = new Dictionary <uint, ICMFProvider>();
Assembly asm = typeof(ICMFProvider).Assembly;
AddProviders(asm);
}
public static KeyValuePair <byte[], byte[]> GenerateKeyIV(string name, CMFHeaderCommon header, CMFApplication app)
{
if (!Providers.ContainsKey(app))
{
FindProviders(app);
}
byte[] digest = CreateDigest(name);
ICMFProvider provider;
if (Providers[app].ContainsKey(header.BuildVersion))
{
TankLib.Helpers.Logger.Info("CASC", $"Using CMF procedure {header.BuildVersion}");
provider = Providers[app][header.BuildVersion];
}
else
{
TankLib.Helpers.Logger.Warn("CASC", $"No CMF procedure for build {header.BuildVersion}, trying closest version");
try {
KeyValuePair <uint, ICMFProvider> pair = Providers[app].Where(it => it.Key < header.BuildVersion).OrderByDescending(it => it.Key).First();
TankLib.Helpers.Logger.Info("CASC", $"Using CMF procedure {pair.Key}");
provider = pair.Value;
} catch {
throw new CryptographicException("Missing CMF generators");
}
}
byte[] key = provider.Key(header, name, digest, 32);
byte[] iv = provider.IV(header, name, digest, 16);
name = Path.GetFileNameWithoutExtension(name);
TankLib.Helpers.Logger.Debug("CMF", $"{name}: key={string.Join(" ", key.Select(x => x.ToString("X2")))}");
TankLib.Helpers.Logger.Debug("CMF", $"{name}: iv={string.Join(" ", iv.Select(x => x.ToString("X2")))}");
return(new KeyValuePair <byte[], byte[]>(key, iv));
}