/// <summary>
/// Handles a HMAC generation request from the server
/// </summary>
/// <param name="subsystem"></param>
/// <param name="requestContext"></param>
private void HandleGenerateHMACRequest(TPMClientSubsystem subsystem, RequestContext <GenerateHMACRequest, GenerateHMACResponse> requestContext)
{
TPMSession session = MyClientContext.TPMClient.FindSession(requestContext.Request.TpmSessionIdentifier);
GenerateHMACResponse response = requestContext.CreateResponse();
if (session == null)
{
_logger.WarnFormat("Received HMAC request for tpm session with id #{0}, but this id is not associated with an active session!",
requestContext.Request.TpmSessionIdentifier);
response.Succeeded = false;
response.SetKnownErrorCode(GenerateHMACResponse.ErrorCodeEnum.TPMSessionNotFound);
response.Execute();
return;
}
_logger.DebugFormat("Requesting password: {0}", requestContext.Request.KeyInfo.KeyType);
ProtectedPasswordStorage pw = session.RequestSecret(requestContext.Request.KeyInfo);
if (pw == null)
{
response.Succeeded = false;
response.SetKnownErrorCode(GenerateHMACResponse.ErrorCodeEnum.HMACSecretMissing);
response.Execute();
return;
}
HMACProvider hmacProvider = new HMACProvider(pw);
response.Succeeded = true;
response.TpmAuthData = hmacProvider.Hash(requestContext.Request.HMACDataProviders);
response.Execute();
}
/// <summary>
/// Gets the key data (which is needed to load the key)
/// </summary>
/// <param name="subsystem"></param>
/// <param name="requestContext"></param>
private void HandleGetKeyDataRequest(TPMClientSubsystem subsystem, RequestContext <GetKeyDataRequest, GetKeyDataResponse> requestContext)
{
TPMSession session = MyClientContext.TPMClient.FindSession(requestContext.Request.TpmSessionIdentifier);
GetKeyDataResponse response = requestContext.CreateResponse();
if (session == null)
{
_logger.WarnFormat("Received HMAC request for tpm session with id #{0}, but this id is not associated with an active session!",
requestContext.Request.TpmSessionIdentifier);
response.Succeeded = false;
response.SetKnownErrorCode(TPMClientSubsystemResponseBase.ErrorCodeEnum.TPMSessionNotFound);
response.Execute();
return;
}
if (session.Keystore.ContainsIdentifier(requestContext.Request.Identifier) == false)
{
response.SetKnownErrorCode(TPMClientSubsystemResponseBase.ErrorCodeEnum.KeyIdentifierMissing);
response.Succeeded = false;
response.Execute();
return;
}
response.KeyData = session.Keystore.GetKeyBlob(requestContext.Request.Identifier);
response.Execute();
}