The jTSS Wrapper series 0.3.x is compatible with TrouSerS 0.2.9.x. There is a newer BETA release of jTSS Wrapper 0.4 which is compatible with TrouSerS 0.3.1+ available in the file download section.
IAIK/OpenTC jTSS Wrapper - TSS Wrapper for the Java (tm) Platform
Trusted Computing, as specified by the Trusted Computing Group (TCG, http://www.trustedcomputinggroup.org/), comprises multiple layers of hard and software. While the hardware consists of the Trusted Platform Module (TPM) and related trusted building blocks, the main software components include the TPM hardware driver and a Trusted Software Stack (TSS). This TSS is typically developed in pure C and can therefore not directly be used from other languages such as Java (tm). For that reason, the IAIK/OpenTC jTSS Wrapper provides language bindings for Java (tm). The goal is to make the Trusted Service Provider Interface (TSPI) layer of the TSS stack available to Java (tm) developers, by wrapping a complete, functional system stack with a Java (tm) interface.
Development of the IAIK/OpenTC jTSS Wrapper is supported by the European Commission as part of the OpenTC project (Ref. Nr. 027635). For more information about the OpenTC project please refer to the OpenTC Project section below.
The IAIK/OpenTC jTSS Wrapper is developed and maintained at the Institute for Applied Information Processing and Communication (Institut fuer Angewandte Informationsverarbeitung und Kommunikation, IAIK, http://www.iaik.tugraz.at/) at Graz University of Technology (http://www.tugraz.at/).
The Open Trusted Computing (OpenTC) consortium is an R&D project focusing on the development of trusted and secure computing systems based on open source software. The project targets traditional computer platforms as well as embedded systems such as mobile phones.
The goal of OpenTC is to reduce system-related threats, errors and malfunctions. The lack of platform security in today's computers has given rise to waves of successful attacks, resulting in severe damages to enterprises and potential failure of critical infrastructures.
The OpenTC consortium will define and implement an open Trusted Computing framework. The architecture is based on security mechanisms provided by low level operating system layers with isolation properties and interfaces to Trusted Computing hardware. These layers make it possible to leverage enhanced trust and security properties of the platform for standard operating systems, middleware, and applications.
For more information about the OpenTC project please refer to http://www.opentc.net/.
3. A Word of Caution
When experimenting with a real TPM, please keep in mind that the IAIK/OpenTC jTSS Wrapper is currently experimental software. If you are using your TPM in a real production environment, the use of the IAIK/OpenTC jTSS Wrapper is discouraged. No guarantees for data protected by the TPM can be made. Use the software at your own risk!
The IAIK/OpenTC jTSS Wrapper is using a dual licensing model:
5. IAIK/OpenTC jTSS Wrapper vs. IAIK jTSS
Since version 0.3, IAIK/OpenTC jTSS Wrapper is no longer a standalone package but it is an addon to the IAIK jTSS. IAIK jTSS is a TSS completely written using the Java (tm) programming language while IAIK/OpenTC jTSS Wrapper provides Java (tm) bindings for the TrouSerS TSS. To make switching between the wrapper and the full Java (tm) stack as simple as possible, both packages have to use the same API (TSP interface or TSPI). For that reason, IAIK/OpenTC jTSS Wrapper version 0.3 was modified to use the same top level API as the IAIK jTSS. As a consequence, applications developed for older version of IAIK/OpenTC jTSS Wrapper have to be modified to work with the new API. A porting guide is included with IAIK/OpenTC jTSS Wrapper that provides all required information for application porting.
6. Technical Documentation
This section deals with the technical aspects of the IAIK/OpenTC jTSS Wrapper. After outlining the basic architecture, this section deals with the requirements and the installation procedure.
Development of the IAIK/OpenTC jTSS Wrapper is done under Linux using IBM's TrouSerS TSS stack (http://trousers.sourceforge.net/) and hardware TPMs as well as the TPM Emulator from ETH Zuerich (https://developer.berlios.de/projects/tpm-emulator/). Since all software components are publicly available they provide an ideal playground for everyone who is interested in getting a "hands on" experience with Trusted Computing even if there is no hardware TPM available.
The following sections will also provide some instructions about how to install the TPM Emulator and the TrouSerS TSS stack.
6.1. Current Status
The IAIK/OpenTC jTSS Wrapper is currently considered almost feature complete with respect to the TSS 1.1 specification. That means that the TSPI layer of the TSS stack (TrouSerS) is fully made available to Java (tm) developers in an object oriented fashion. The only missing parts are the callback functions Tspicb_*. Those callback functions are not required to make full use of the TSS as they only provide a mechanism to customize the behavior of the TSS.
The following table provides an outline of the architecture of IAIK/OpenTC jTSS Wrapper. The layers are described from the lowest layer, the TPM, upwards.
6.4. Compiling and Installing
This section will guide you through the build and installation process. It covers the TPM Emulator from ETH, the TrouSerS TSS stack and finally the IAIK/OpenTC jTSS Wrapper.
6.5. Building and Installing the TPM Emulator
If you have a hardware TPM you can skip this step (but you have to make sure that you have a hardware driver installed for your TPM that is compatible with TrouSerS).
6.6. Building and Installing the TrouSerS TSS stack
6.7. Building and Installing the IAIK/OpenTC jTSS Wrapper
This section provides a step by step guide of the build process of the "partially prebuilt" version of the IAIK/OpenTC jTSS Wrapper.
unpack the source and change into the source folder
+tar jxf jTssWrapper_0.3.tar.bz2
Now save and close the Makefile.
building the native library with +make
note: For linking, it is assumed that the libtspi library of TrouSerS is located in a path known to your linker. Otherwise you might want to set the LD_LIBRARY_PATH environment variable accordingly.
note: you can re-generate the prebuilt swig interface with make full.
At this point you should now have a file called libtspiwrapper.so in the output/lib folder. For testing the setup, please proceed to the Testing the Setup section below.
6.8. IAIK jTSS TSP Library
Please ensure that you have downloaded the IAIK jTSS TSP library (see External Requirements). The IAIK jTSS TSP library has to be copied from the lib folder of the IAIK jTSS to the ext_libs folder of the IAIK/OpenTC jTSS Wrapper.
The IAIK/OpenTC jTSS Wrapper is shipped together with a set of unit tests which can be found in the tsp_tests folder. The unit test come already as a jar. This section describes how to start the individual components to be able to run the unit tests. It is assumed that the TPM emulator is used. If you are using a hardware TPM simply skip the steps involving the emulator.
WARNING: If you are not using the TPM emulator, please note that the jUnit tests include also test code for the TakeOwnership operation where an owner password (for instance "opentc") is set. The TakeOwnership operation will fail if there is already an owner set. It is generally NOT recommended to run the test suite on a TPM that is actually used in a production system with sensitive data protected by the TPM.
Before the unit tests can be run, the TPM emulator Kernel module has to be loaded:
In the next step start the userspace part of the TPM Emulator:
tpmd -f clear
Please note, that it might be required to unload TPM hardware drivers loaded by your distribution since they might conflict with your distribution.
After loading the emulator, a new device node /dev/tpm should show up. Depending on distribution, you might need to create the following symlink to make the TrouSerS TSS work with the emulator:
ln -s /dev/tpm /dev/tpm0
As a next step, the Trusted Core Services Daemon tcsd of the TrouSerS TSS has to be started (-f for foreground):
The tcsd binary is assumed to be located in the PATH of your shell.
Finally, to start the unit tests change into the IAIK/OpenTC jTSS Wrapper folder and enter the following command:
This will run the JUnit test suit. If all goes well, the test run should conclude with a statement like: OK (52 tests).
In case you want to clear the persistent storage of the TrouSerS TSS (which might happen from time to time when doing tests and development), you have to delete the following file (default location):
6.10. Summary of components
This section presents a summary of the of the most important parts of the IAIK/OpenTC jTSS Wrapper distribution.
7. Documentation and Further Reading
IAIK/OpenTC jTSS Wrapper distribution comes together with a JavaDoc type documentation which can be found in the output/javadoc_highlevel folder.
A good starting point for further reading is the TSS 1.1b specification at http://www.trustedcomputinggroup.org/ where all TSS functions are described. As far as the IAIK/OpenTC jTSS Wrapper is concerned, the relevant parts are the general sections of the document and the parts detailing the Tspi_* functions.
A good place to get started with the IAIK/OpenTC jTSS Wrapper are the JUnit tests provided in the highlevel_tests folder.
This software is provided "as is". However, a mailing list mailto:firstname.lastname@example.org is maintained at http://trustedjava.sf.net/ to assist users and to allow users to help each other. You are invited to join the discussion, but kindly take a look at the mailing list archive before posting a question.
9. Experimental Features
These features are purely experimental, not throughly tested and NO support whatsoever can be provided.
11. Copyright Notice
The copyright for contents of the IAIK/OpenTC jTSS Wrapper package, including all related documentation, is owned by IAIK, Graz University of Technology.
Java (tm) and all Java (tm) based marks are a trademark or registered trademark of Sun Microsystems, Inc, in the United States and other countries. All other trademarks and copyrights are property of their respective owners.
13. Revision History