public static void TestCmacTestVectors(TestData data)
{
var actual = new byte[0x10];
Aes.CalculateCmac(actual, data.Message.AsSpan(data.Start, data.Length), data.Key);
Assert.Equal(data.Expected, actual);
}
private Validity ValidateSignature(KeySet keySet)
{
Span <byte> calculatedCmac = stackalloc byte[0x10];
Aes.CalculateCmac(calculatedCmac, Data.AsSpan(0x100, 0x200), keySet.DeviceUniqueSaveMacKeys[0]);
return(CryptoUtil.IsSameBytes(calculatedCmac, Cmac, Aes.BlockSize) ? Validity.Valid : Validity.Invalid);
}
private static void DecryptKeyBlobs(KeySet s, IProgressReport logger = null)
{
var cmac = new AesCmac();
for (int i = 0; i < KeySet.UsedKeyBlobCount; i++)
{
if (s.KeyBlobKeys[i].IsZeros() || s.KeyBlobMacKeys[i].IsZeros() || s.EncryptedKeyBlobs[i].IsZeros())
{
continue;
}
Aes.CalculateCmac(cmac, s.EncryptedKeyBlobs[i].Bytes.Slice(0x10, 0xA0), s.KeyBlobMacKeys[i]);
if (!Utilities.SpansEqual <byte>(cmac, s.EncryptedKeyBlobs[i].Cmac))
{
logger?.LogMessage($"Warning: Keyblob MAC {i:x2} is invalid. Are SBK/TSEC key correct?");
}
Aes.DecryptCtr128(s.EncryptedKeyBlobs[i].Bytes.Slice(0x20), s.KeyBlobs[i].Bytes, s.KeyBlobKeys[i],
s.EncryptedKeyBlobs[i].Counter);
}
}
public Result Commit(Keyset keyset)
{
CoreDataIvfcStorage.Flush();
FatIvfcStorage?.Flush();
Stream headerStream = BaseStorage.AsStream();
var hashData = new byte[0x3d00];
headerStream.Position = 0x300;
headerStream.Read(hashData, 0, hashData.Length);
var hash = new byte[Sha256.DigestSize];
Sha256.GenerateSha256Hash(hashData, hash);
headerStream.Position = 0x108;
headerStream.Write(hash, 0, hash.Length);
if (keyset == null || keyset.SaveMacKey.IsEmpty())
{
return(ResultFs.PreconditionViolation.Log());
}
var cmacData = new byte[0x200];
var cmac = new byte[0x10];
headerStream.Position = 0x100;
headerStream.Read(cmacData, 0, 0x200);
Aes.CalculateCmac(cmac, cmacData, keyset.SaveMacKey);
headerStream.Position = 0;
headerStream.Write(cmac, 0, 0x10);
headerStream.Flush();
return(Result.Success);
}
