/// <summary>
/// Increments the current counter value and returns the new counter value
/// </summary>
/// <returns></returns>
public uint Increment()
{
Parameters incCounterParams = new Parameters();
incCounterParams.AddPrimitiveType("counter_id", _counterId);
return(_tpmSession.DoTPMCommandRequest(new TPMCommandRequest(TPMCommandNames.TPM_CMD_IncrementCounter, incCounterParams))
.Parameters.GetValueOf <TPMCounterValue>("counter_value").CounterValue);
}
/// <summary>
/// Creates a new counter if possible.
/// Creating a counter requires the owner password and also the secret_counter secret
/// </summary>
/// <param name="label">4 bytes to label the counter</param>
/// <returns></returns>
public CounterContext CreateCounter(byte[] label)
{
if (label.Length != 4)
{
throw new ArgumentException("label needs to be of size 4");
}
ProtectedPasswordStorage counterSecret = _tpmSession.RequestSecret(new HMACKeyInfo(HMACKeyInfo.HMACKeyType.CounterSecret, new Parameters()));
if (counterSecret.Hashed == false)
{
counterSecret.Hash();
}
counterSecret.DecryptHash();
Parameters createCounterParams = new Parameters();
createCounterParams.AddPrimitiveType("secret", counterSecret.HashValue);
createCounterParams.AddPrimitiveType("label", label);
return(new CounterContext(_tpmSession,
_tpmSession.DoTPMCommandRequest(new TPMCommandRequest(TPMCommandNames.TPM_CMD_CreateCounter, createCounterParams))
.Parameters.GetValueOf <uint>("counter_id")
));
}
private TPMCommandResponse BuildDoVerifyRequest(string commandIdentifier, Parameters parameters)
{
TPMCommandRequest versionRequest = new TPMCommandRequest(commandIdentifier, parameters);
TPMCommandResponse response = _tpmSession.DoTPMCommandRequest(versionRequest);
if (response.Status == false)
{
throw new TPMRequestException("An unknown tpm error occured");
}
return(response);
}
public void Init(bool forEncryption, ICipherParameters parameters)
{
_forEncryption = forEncryption;
if (forEncryption)
{
_encryptor = _keyHandle.PublicKey.CreateRSAEncrypter();
Parameters bindParameters = new Parameters();
bindParameters.AddPrimitiveType("type", "request_prefix");
TPMCommandRequest bindPrefixRequest = new TPMCommandRequest(
TPMCommandNames.TPM_CMD_Bind, bindParameters);
_prefix = _session.DoTPMCommandRequest(bindPrefixRequest).Parameters.GetValueOf <byte[]>("prefix");
}
}