public static void Process(Context ctx)
{
if (ctx.Options.SdPath == null)
{
ctx.Logger.LogMessage("SD path must be specified.");
return;
}
Span <AesXtsKey> keys = ctx.KeySet.SdCardEncryptionKeys;
using var baseFile = new LocalFile(ctx.Options.InFile, OpenMode.Read);
AesXtsFile xtsFile = null;
int contentType = 0;
for (int i = 0; i < keys.Length; i++)
{
byte[] kekSource = keys[i].SubKeys[0].DataRo.ToArray();
byte[] validationKey = keys[i].SubKeys[1].DataRo.ToArray();
try
{
xtsFile = new AesXtsFile(OpenMode.Read, baseFile, ctx.Options.SdPath.ToU8String(), kekSource, validationKey, 0x4000);
contentType = i;
break;
}
catch (HorizonResultException) { }
}
if (xtsFile == null)
{
ctx.Logger.LogMessage("Error: NAX0 key derivation failed. Check SD card seed and relative path.");
return;
}
ctx.Logger.LogMessage(xtsFile.Print(contentType));
if (string.IsNullOrWhiteSpace(ctx.Options.PlaintextOut))
{
return;
}
xtsFile.AsStorage().WriteAllBytes(ctx.Options.PlaintextOut, ctx.Logger);
ctx.Logger.LogMessage($"Saved Decrypted NAX0 Content to {ctx.Options.PlaintextOut}...");
}
private static string Print(this AesXtsFile xtsFile, int contentType)
{
int colLen = 36;
var sb = new StringBuilder();
sb.AppendLine();
sb.AppendLine("NAX0:");
AesXtsFileHeader header = xtsFile.Header;
uint magic = header.Magic;
PrintItem(sb, colLen, " Magic:", Util.GetUtf8String(SpanHelpers.AsReadOnlyByteSpan(ref magic)));
PrintItem(sb, colLen, " Content Type:", GetContentType(contentType));
PrintItem(sb, colLen, " Content Size:", $"{header.Size:x12}");
PrintItem(sb, colLen, " Header HMAC:", header.Signature);
PrintItem(sb, colLen, " Encrypted Keys:", header.EncryptedKey1.Concat(header.EncryptedKey2).ToArray());
PrintItem(sb, colLen, " Decrypted Keys:", header.DecryptedKey1.Concat(header.DecryptedKey2).ToArray());
return(sb.ToString());
}
