wolfSSL now has support for Zephyr RTOS through a newly added wolfTPM Zephyr port. This enables easy integration of TPM 2.0 functionality in embedded projects using Zephyr, expanding the flexibility and portability of secure applications.
Below is a summary of the key features introduced in the PR#395:
Key Changes and Features
Zephyr Module Integration
wolfTPM has been added as a Zephyr module, complete with CMake and Kconfig support. This makes it simple to include TPM functionality in any Zephyr-based project using standard module inclusion through west.
Sample Applications
Two test/sample applications are included in the port:
- wolftpm_wrap_test – tests core TPM wrapper functionality
- wolftpm_wrap_caps – displays TPM capabilities
Both examples build and run successfully on qemu_x86, providing developers with a solid foundation to build on.
Custom Configuration Support
The module uses a user_settings.h configuration file, which can be customized or replaced as needed by developers to match project-specific requirements.
CI Integration
A new
Device Tree Integration
Communicating with your TPM in zephyr is as simple as setting WOLFTPM_ZEPHYR_I2C_BUS in user_settings.h to the node describing the i2c bus on your device. You can also set the speed of the i2c line with WOLFTPM_ZEPHYR_I2C_SPEED.
Getting Started
To learn more about using wolfTPM with Zephyr and how to set it up in your project, see:
- Pull Request with full details: PR#395
- Getting Started Documentation: zephyr/README.md
Conclusion
wolfTPM now supports Zephyr RTOS, enabling robust TPM 2.0 integration in lightweight embedded systems. With CI coverage, modular design, and working samples, developers can confidently build secure applications using wolfTPM on Zephyr.
If you have questions about any of the above, please contact us at facts@wolfssl.com or call us at +1 425 245 8247.
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