public static byte[] CalculateSignature(byte[] signingKey, SMB2Dialect dialect, byte[] buffer, int offset, int paddedLength)
{
if (dialect != SMB2Dialect.SMB202 && dialect != SMB2Dialect.SMB210)
{
return(AesCmac.CalculateAesCmac(signingKey, buffer, offset, paddedLength));
}
using HMACSHA256 sha256 = new HMACSHA256(signingKey);
return(sha256.ComputeHash(buffer, offset, paddedLength));
}
public static byte[] CalculateSignature(byte[] signingKey, SMB2Dialect dialect, byte[] buffer, int offset, int paddedLength)
{
if (dialect == SMB2Dialect.SMB202 || dialect == SMB2Dialect.SMB210)
{
return(new HMACSHA256(signingKey).ComputeHash(buffer, offset, paddedLength));
}
else
{
return(AesCmac.CalculateAesCmac(signingKey, buffer, offset, paddedLength));
}
}
public MacBenchmark()
{
var key = Utils.GetRandomBytes(BlockSize);
var iv = Utils.GetRandomBytes(BlockSize);
message = Utils.GetRandomBytes(MessageSize);
cmac = new AesCmac(key);
pmac = new AesPmac(key);
var aes = Aes.Create();
aes.Mode = CipherMode.CBC;
encryptor = aes.CreateEncryptor(key, iv);
}
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);
}
}