Mbed TLS
| Developer(s) | Simon Butcher (lead maintainer), Janos Follath, Andrés Amaya García |
|---|---|
| Stable release |
2.2.1 (January 4, 2016 ) |
| Preview release | 1.4 DTLS preview (February 16, 2015) |
| Written in | C |
| Operating system | Multi-platform |
| Type | Security library |
| License | Apache 2.0 (GPLv2 is still available that was the default previously or proprietary; PolarSSL has a GPL linking exception for free software. |
| Website | tls |
2.2.1 (January 4, 2016 )
2.1.4 (January 4, 2016 )
1.3.16 (January 4, 2016 )
mbed TLS (previously PolarSSL) is an implementation of the TLS and SSL protocols and the respective cryptographic algorithms and support code required. It is dual-licensed with the Apache License version 2.0 (with GPLv2 also available). Stated on the website is that mbed TLS aims to be "easy to understand, use, integrate and expand".
The PolarSSL SSL library is the official continuation fork of the XySSL SSL library. XySSL was created by the French "white hat hacker" Christophe Devine and was first released on November 1, 2006, under GPL and BSD licenses. In 2008, Christophe Devine was no longer able to support XySSL and allowed Paul Bakker to create the official fork, named PolarSSL. In November 2014, PolarSSL was acquired by ARM Holdings.
In 2011, the Dutch government approved an integration between OpenVPN and PolarSSL, which is named OpenVPN-NL. This version of OpenVPN has been approved for use in protecting government communications up to the level of Restricted.
As of the release of version 1.3.10, PolarSSL has been rebranded to mbed TLS to better show its fit inside the mbed ecosystem. It was also announced that the licence would change from GPL to Apache License later in 2015 (with a goal of before October).
The core SSL library is written in the C programming language and implements the SSL module, the basic cryptographic functions and provides various utility functions. Unlike OpenSSL and other implementations of TLS, mbed TLS is designed to fit on small embedded devices, with the minimum complete TLS stack requiring under 60KB of program space and under 64 KB of RAM. It is also highly modular: each component, such as a cryptographic function, can be used independently from the rest of the framework. Versions are also available for Microsoft Windows and Linux. Because mbed TLS is written in the C programming language, without external dependencies, it works on most operating systems and architectures without any trouble.
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