https://github.com/siemens/embeddedcmp

proof-of-concept CMP client on the NXP FRDM-K64F platform
https://github.com/siemens/embeddedcmp

Last synced: 3 months ago
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proof-of-concept CMP client on the NXP FRDM-K64F platform

• Host: GitHub
• URL: https://github.com/siemens/embeddedcmp
• Owner: siemens
• License: other
• Created: 2019-10-01T12:59:16.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2025-04-01T13:24:10.000Z (10 months ago)
• Last Synced: 2025-06-13T13:42:52.087Z (7 months ago)
• Language: C
• Size: 310 KB
• Stars: 4
• Watchers: 12
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

          


# frdmk64f_CMP-Client

This project provides source code, documentation, and other files for a CMP client

implemented on the NXP FRDM-K64F platform based on the Kinetis SDK (KSDK).

It is a fork of [CMPclient-embedded-lib](https://github.com/nokia/CMPclient-embedded-lib) by Martin Peylo at Nokia.

This prototypical code explicitly does not have production quality

but constructively proves that CMP can be implemented and used

even on a device that does not have the capacity to contain OpenSSL

(or any other TLS implementation) nor a proper operating system.

It essentially uses just the cryptography support provided by mbedTLS

and some basic I/O functionality including a bare-bones HTTP or CoAP client.

As expected, its code size, network bandwidth, and computation resource

footprint are similar to an EST implementation (while it does not need (d)TLS

but performs self-contained message protection as far as needed).

This also serves as a PoC for current standardization efforts at the IETF

on profiling the CMP standard [RFC 4210](https://tools.ietf.org/html/rfc4210),

[RFC 6712](https://tools.ietf.org/html/rfc6712)

towards use in embedded systems and the IoT.

## License

This software is licensed under the Apache License, Version 2.0.

## Disclaimer

Please note that this software and associated documentation files is a prototypical

implementation and merely serves as proof-of-concept.

It is explicitly not guaranteed that all related functionality and hardening measures

needed for productive software have been implemented.

The development procedures and processes for proof-of-concept implementation are

not sufficient to assure product-grade software quality. Therefore the code, scripts,

configuration, and documentation of the software are provided ‘as is’

and can only serve as an example or starting point for further development.

## How to use

For instructions how to get the required underlying sources

and then build and use this software

please refer to [HOWTO.md](/cmp_doc/HOWTO.md).

## Software architecture

The following picture gives a rough overview of the software components used by the embedded CMP client.

The bulk of the underlying software is part of the Kinetis SDK or the Git repository of libcoap.

![SW architecture](/cmp_doc/sw_architecture.jpg)

The generic data flow of the certificates is shown in the following figure.

![Certificate flow](/cmp_doc/certificate_flow.jpg)