public static string DeriveTitlePassFromKey(byte[] titleIdBytes, byte[] titleKey)
{
foreach (string tryPass in KeyGenTryPasswords.Concat(new [] { new string(titleIdBytes.Slice(4, 4).AsChars()).ToUpperInvariant() }))
{
byte[] tryTitleKey = TitleKeyGen.Derive(titleIdBytes, tryPass);
if (tryTitleKey == titleKey)
{
return(tryPass);
}
}
return(null);
}
public static async Task <(TicketBooth.Ticket ticket, List <string> contentsList)> MakeTicketAndDecryptMetadataContents(byte[] titleIdBytes, TitleMetadata metadata, string titleDir, bool makeQolFiles = false)
{
if (metadata.NumContents <= 0)
{
return(null, new List <string>());
}
List <string> contentsList = new List <string>();
TicketBooth.Ticket ticket = null;
bool success = false;
string contentPath = Path.Combine(titleDir, metadata.ContentInfo[0].Id.ToString("x8"));
string appPath = "";
// TODO: Not needed for any known DSiWare titles, but could be a decent idea to test the gamecode of the game as a password
foreach (string tryPass in KeyGenTryPasswords)
{
byte[] titleKey = TitleKeyGen.Derive(titleIdBytes, tryPass);
ticket = new TicketBooth.Ticket(titleKey);
appPath = await ticket.DecryptContent(metadata.ContentInfo[0].Index, contentPath);
RomInfo cInfo = new RomInfo(appPath, makeQolFiles);
success = cInfo.ValidContent;
if (!success)
{
continue;
}
Log.Instance.Trace($"'{tryPass}' is the password for the title key of '{contentPath}'!");
// Somewhat redundant given the CRC validation of the decrypted ROM in RomInfo, but still good to check
if (VerifyMetadataContent(metadata, appPath, 0, titleDir, metadata.ContentInfo[0].Id.ToString("x8")))
{
await File.WriteAllTextAsync(Path.Combine(titleDir, TitlePasswordFileName), tryPass);
await File.WriteAllBytesAsync(Path.Combine(titleDir, TitleKeyFileName), titleKey);
}
contentsList.Add(metadata.ContentInfo[0].Id.ToString("x8"));
if (makeQolFiles)
{
MakeQolFiles(cInfo, titleDir);
}
break;
}
if (!success)
{
Log.Instance.Error($"Unable to find the password for the title key of '{contentPath}'.");
File.Delete(appPath);
return(null, new List <string>());
}
for (int i = 1; i < metadata.NumContents; i++)
{
string contentName = metadata.ContentInfo[i].Id.ToString("x8");
contentsList.Add(contentName);
contentPath = Path.Combine(titleDir, contentName);
string decPath = await ticket.DecryptContent(metadata.ContentInfo[i].Index, contentPath);
VerifyMetadataContent(metadata, decPath, i, titleDir, contentName);
}
return(ticket, contentsList);
}
