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Chapter 6. Execution Environment

Future chapters in this book present code examples to illustrate concepts. In order for you to be able to build and run these code examples, this chapter describes how to set up an execution environment and build TPM 2.0 sample applications. An execution environment consists of two things: a TPM and a software stack to communicate with the TPM. You can use a hardware or software TPM to run the code examples. In this chapter you learn how to set up the Microsoft TPM 2.0 simulator, a software implementation of TPM 2.0. For software stacks, currently there are two software API environments for TPM 2.0 programming: Microsoft's TSS.net and TSS 2.0. This chapter demonstrates how to set up both of these environments.

Setting Up the TPM

All TPM 2.0 programming environments require a TPM to run code against. For developers, the TPM that is easiest to use is the Microsoft TPM 2.0 simulator. Of course, you can also use other TPM 2.0 devices, hardware, and firmware, as they become available, to run the code examples. Because communication with a hardware or firmware TPM is platform specific, you must use the correct driver; setting up this driver isn't described here.

Microsoft Simulator

Provided by Microsoft, the Microsoft simulator is a full TPM 2.0 device implemented completely in software. Application code can communicate with the simulator via a sockets interface. This means the simulator can be run on the same system as the application or on a remote system connected via a network.

Two versions of the simulator are available. A binary-only version can be downloaded from: research.microsoft.com/en-US/downloads/35116857- e544-4003-8e7b-584182dc6833/default.aspx. For TCG members, the second, and better, option is to obtain the TPM 2.0 simulator source code and build it. The advantage of doing this is that it allows an application developer to step through the simulator itself, which is often quite useful when debugging errors. In either case, the simulator can only run under Windows.

You will first learn how to build the simulator from source code and set it up. Then, for non-TCG members, you will learn how to get the TSS.net or simulator binary and use the simulator executable. Finally, the chapter presents a simple Python program that you can use to test that the simulator is working.

Building the Simulator from Source Code

This option is available only to TCG members, because it requires downloading source code from TCG's web site. Go to the trustedcomputinggroup.org web site, click Member Login at top right, click the Groups pull-down at left, select TPMWG under My Groups, and then click Documents. At this point you should be at this web site: https://members.trustedcomputinggroup.org/apps/org/workgroup/tpmwg/ documents.php. Find the latest version of the simulator, and download it; it will be called something like TPM 2.0 vX.XX VS Solution.

Building the simulator requires that Visual Studio 2012 or later be installed. Follow the directions in the TPM 2.0 Simulator release notes file to build the simulator.

 
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