So, what’s new at wolfSSL? Take a look below to check out the most recent news.
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In addition, wolfSSL now has a support-specific blog page dedicated to answering some of the more commonly received support questions.

wolfSSL 4.5.0 Now Available

The summer release of wolfSSL, v4.5.0, is now available! This release has many new features, optimizations, and bug fixes. Some of the new features we added to the wolfSSL embedded SSL/TLS library include:

  • TLS v1.3 is now enabled by default
  • Building FIPS 140-2 code and test on Solaris
  • Secure renegotiation with DTLS 1.2
  • Additional OpenSSL compatibility layer functions added
  • Added certificate parsing and inspection to C# wrapper layer
  • Added Xilinx Vitis 2019.2 example and README updates
  • Update RSA calls for hardware acceleration with Xilsecurew
  • Cypress PSoC6 wolfCrypt driver added
  • Added STM32CubeIDE support
  • TSIP v1.09 for target board GR-ROSE support added
  • Added support for the Renesas RX72N “X72N Envision Kit” evaluation board

Check out the README from the download for a full list, or contact us at with any questions.

Upcoming Webinar: wolfSSL for STM32CubeMXv6

We are excited to announce our upcoming webinar: wolfSSL for STM32CubeMXv6! Join us for a 1-hour webinar to learn how wolfSSL & ST can easily integrate in STM32CubeMX projects.

You will learn:

  • New features of the latest STM32CubeMX tool from ST
  • How wolfSSL embedded security features set users ahead of the pack with speed, portability and feature set
  • How to easily integrate wolfSSL into your project using the STM32CubeMX tool

There will be a live Q&A session at the end of the webinar where ST and wolfSSL’s experienced engineers will be available to answer your questions.

By registering for this webinar, you submit your information to STMicroelectronics and wolfSSL and their distributors, who will use it to communicate with you regarding this event and their other services.



Session 1:  Oct 1, 2020 08:00 AM Paris 

Register in advance for this webinar:


Session 2: Oct 1, 2020 10:00 AM Paris 

Register in advance for this webinar:

After registering, you will receive a confirmation email containing information about joining the webinar.


Latest updates on STMicroelectronics and wolfSSL: 

wolfSSL, an ST Authorized Partner, now offers support for STM32Cube pack for STM32, adding on to previous support for the STM32 Standard Peripheral Library as well as the STM32Cube HAL (Hardware Abstraction Layer). wolfSSL also maintains and makes available an STM32Cube Expansion Package for wolfSSL to make it easy for users to pull wolfSSL directly into STM32CubeMX and STM32CubeIDE projects.

The wolfSSL embedded SSL/TLS library has support for several of the STM32 microcontrollers and for the hardware-based cryptography and random number generator offered by them as well. Our most recent update is that wolfSSL now offers support for Cube pack for STM32, adding on to previous support for the STM32 Standard Peripheral Library as well as the Cube HAL (Hardware Abstraction Layer). wolfSSL also maintains and makes available an STM32Cube Expansion Package for wolfSSL to make it easy for users to pull wolfSSL directly into STM32CubeMX and STM32CubeIDE projects. 

A full list of STM32 benchmarks can be found here:


About STMicroelectronics 

STMicroelectronics is a global leader in the semiconductor market serving customers across the spectrum of sense and power and automotive products and embedded processing solutions. From energy management and savings to trust and data security, from healthcare and wellness to smart consumer devices, in the home, car and office, at work and at play, ST is found everywhere microelectronics make a positive and innovative contribution to people’s life. By getting more from technology to get more from life, ST stands for life.augmented.




Read our latest blog post about how the Cube pack for STM32 is now available! – wolfSSL


Check out the wolfSSL embedded SSL/TLS library, star us on Github, and learn more about the latest TLS 1.3 is available in wolfSSL.

wolfSSL will be attending Black Hat Asia

We have exciting news, wolfSSL will be attending Black Hat Asia! This event will be held virtually in the Singapore Time Zone from September 29-October 2. During this week, information security experts will teach interactive, online Trainings, innovative research will be presented at Briefings, the latest open-source tools will be showcased at Arsenal, and the Business Hall will feature top-tier security solutions and service providers, plus ample networking events and opportunities. 

As part of this event, you can attend training sessions that provide opportunities for firsthand technical skill-building taught by specialists for offensive and defensive hackers of all levels and learn the latest information security risks and trends! The virtual Business Hall offers unique opportunities for community engagement between vendors and attendees from around the world including wolfSSL! Come talk to one of our experts on TLS 1.3, embedded security, embedded SSL/TLS, Secure Boot, MQTT, SSH, TPM 2.0, curl + tiny-curl, FIPS, DO-178, MISRA and more. We’ve got the best-tested crypto on the market and the best security without sacrificing performance, so feel free to ask about our benchmarks!

We can’t wait to “see” you!


For more information about wolfSSL, our products, or future events, please contact

Raccoon Attacks

If our little meme didn’t already convince you otherwise, raccoon attacks are not a big deal when it comes to wolfSSL, read more on our internal review of raccoon attacks here:!

To learn more about us, checkout the wolfSSL embedded SSL/TLS library, star us on GitHub, and find out more about using TLS 1.3 on wolfSSL! Contact us at with any questions and for technical support, email!

wolfSSL + Tenasys INTime RTOS

Did you know that wolfSSL includes a port to the Tenasys INTime RTOS? You can read more in our original press release from Tenasys here: Secured INtime system traffic!  Tenasys is using wolfSSL to secure their networked real-time systems and wolfSSL is happy to be integrated into the INTime networking stack which allows us to provide world renowned security to INTime SDK consumers.

wolfSSL also provides a FIPS 140-2 (and soon to be FIPS 140-3!) validated version of wolfCrypt! We also provide a “FIPS Ready” version of wolfSSL which is not associated with a FIPS validation, but includes FIPS-specific code. For users who may need a FIPS validated cryptography library in the future, FIPS Ready can be a good choice to make the transition as easy as possible.

If you have any questions, contact wolfSSL at


User-Generated Performance Advisory for Cortex M – Newlib vs Newlib-Nano

A big thank you to who has shared results for their own project in hopes of further helping fellow users when building on an embedded Cortex M platform.

“I had a working project build with Segger Embedded Studio for a Nordic NRF52840 (64MHz Cortex M). We switched our build tooling to use cmake/ninja along with the newlib-nano libraries packaged with ARM GCC tools. One thing I noticed is that our TLS handshake in our application went from 3 seconds to about 16 seconds.

Using the built in wolf test functions, I was able to track down the issue.

While Segger Embedded Studio uses GCC, they have their own builds of the C standard libraries.The wolfcrypt ECC routines are very sensitive to how the C libraries are built.



I could eventually get “better” performance than the SES custom library but had to use NewLib and not NewLib-nano. This results in a larger binary but the performance is much better.   


wolf Test Time 

Segger Embedded Studio w/ custom std libs: 208 seconds

ARM GCC Embedded w/ Newlib-Nano:  608 seconds

ARM GCC Embedded w/ Newlib:  202 seconds

ARM GCC Embedded w/ Newlib &WOLFSSL_SP_ARM_CORTEX_M_ASM :  175 seconds


In addition to using Newlib, I found the macro WOLFSSL_SP_ARM_CORTEX_M_ASM helped quite a bit.  (Appears it has hand tuned ASM routines for SP math).

Apparently, newlib is built with speed optimizations and newlib-nano is built with size optimizations. I was surprised at the stark difference. I have other math heavy routines and the difference in execution speed is only 5% between -03 and -Os.  It seems that the ECC SP routines have some sensitivity to the C library.

Hope this is helpful to anyone building for a Cortex M MCU.” 


To read the original forum post:

Thank you for sharing these findings. We hope others on the Cortex M will see this. The SP WOLFSSL_SP_ARM_CORTEX_M_ASM option is quite impressive for RSA/DH/ECC math speedups because it uses hand written assembly. At wolfSSL, we love to hear your findings and projects, so please feel free to reach out and keep us posted! 


Additional Resources 

Check out Eli’s article series for NXP on LPC55S69 and stay tuned for an upcoming set on cellular IoT and cloud connectivity. 

Please contact us at for any general questions and for technical support, please contact or view our FAQ page

Check out the wolfSSL embedded SSL/TLS library, star us on Github, and learn more about the latest TLS 1.3 is available in wolfSSL. 



This post has been cross posted from Daniel Stenberg’s blog – originally posted here.

We have started the work on extending wolfSSL to provide the necessary API calls to power QUIC and HTTP/3 implementations!

Small, fast and FIPS

The TLS library known as wolfSSL is already very often a top choice when users are looking for a small and yet very fast TLS stack that supports all the latest protocol features; including TLS 1.3 support – open source with commercial support available.

As manufacturers of IoT devices and other systems with memory, CPU and footprint constraints are looking forward to following the Internet development and switching over to upcoming QUIC and HTTP/3 protocols, wolfSSL is here to help users take that step.

A QUIC reminder

In case you have forgot, here’s a schematic view of HTTPS stacks, old vs new. On the right side you can see HTTP/3, QUIC and the little TLS 1.3 box there within QUIC.


There are no plans to write a full QUIC stack. There are already plenty of those. We’re talking about adjustments and extensions of the existing TLS library API set to make sure wolfSSL can be used as the TLS component in a QUIC stack.

One of the leading QUIC stacks and so far the only one I know of that does this, ngtcp2 is written to be TLS library agnostic and allows different TLS libraries to be plugged in as different backends. I believe it makes perfect sense to make such a plugin for wolfSSL to be a sensible step as soon as there’s code to try out.

A neat effect of that, would be that once wolfSSL works as a backend to ngtcp2, it should be possible to do full-fledged HTTP/3 transfers using curl powered by ngtcp2+wolfSSL. Contact us with other ideas for QUIC stacks you would like us to test wolfSSL with!

FIPS 140-2

We expect wolfSSL to be the first FIPS-based implementation to add support for QUIC. I hear this is valuable to a number of users.


This work begins now and this is just a blog post of our intentions. We and I will of course love to get your feedback on this and whatever else that is related. We’re also interested to get in touch with people and companies who want to be early testers of our implementation. You know where to find us!

I can promise you that the more interest we can sense to exist for this effort, the sooner we will see the first code to test out.

It seems likely that we’re not going to support any older TLS drafts for QUIC than draft-29.

wolfSSL offers commercial support packages and consulting for cURL and tiny-curl!  Contact us at to learn more.

Where We’ll Be This Week

Happy Monday to our wolfSSL community! This week we will be participating in two very exciting events! Come visit us virtually to learn more about wolfSSL as well as the greater community in cryptography and embedded systems.


September 21st – 24th is the virtual International Cryptographic Module Conference (ICMC20)!
ICMC is the leading event for global expertise in commercial cryptography. At ICMC20 Virtual over 400 industry leaders from 27 countries collaborate to address the challenges faced by those who develop, produce, test, specify, and use cryptographic modules. In this upcoming event, there will be a strong emphasis on standards such as FIPS 140-3, ISO/IEC 19790, eEIDAS, and Common Criteria.

To learn more:

September 23rd – 24th is the MtoM & Connected Objects – Embedded Systems Conference! This conference will be a virtual event surrounding embedded systems and software, display, visualization, design and testing of systems. It enables attendees to discover new technological trends, standards and regulations of IoT, MtoM and embedded systems markets and supports them in developing or deploying new projects.

Our partner AC6 will be hosting at our stand A12. Stop by to learn about this exciting new partnership and how your customers can benefit from wolfSSL training in SSL/TLS and the importance of security in embedded systems.

To learn more:

In the meanwhile, check out the wolfSSL embedded SSL/TLS library, star us on GitHub, and learn more about using TLS 1.3 in wolfSSL!  Contact us at with any questions.

wolfSSL supports Infineon AURIX Boards

Three years ago, wolfSSL partnered with Infineon, making it easier to ensure security on Infineon-based projects. Today wolfSSL continues to foster our relationship with Infineon, including support for the latest AURIX boards.  

AURIX (Automotive Real Time Integrated Next Generation Architecture) is a 32- bit Infineon microcontroller family targeting the automotive industry in terms of performance and safety. AURIX’s multicore architecture is based on up to three independent 32-bit TriCore CPUs.



Infineon designs, develops, manufactures and markets a broad range of semiconductors and system solutions. The focus of its activities is on automotive electronics, industrial electronics, mobile devices and chip card-based security. Combining entrepreneurial success with responsible action, Infineon addresses some of the most critical challenges of society: Efficient use of energy, environmentally friendly mobility and security in a connected world.

The wolfSSL embedded SSL/TLS library is a perfect fit for securing lightweight, resource-constrained devices. wolfSSL has a footprint size of 20-100kB, offers protocol support up to TLS 1.3 and DTLS 1.2, progressive algorithm support, hardware crypto support, and more.

Read more about our partnership with Infineon:


For more information regarding wolfSSL or any additional questions, please contact

In the meanwhile, check out the wolfSSLembedded SSL/TLS library, star us on GitHub, and learn more about the latestTLS 1.3 is available in wolfSSL.


Upcoming Partner Webinar: Security & Certifications for Critical Embedded Industries Hosted by wolfSSL and SYSGO 

wolfSSL and SYSGO are excited to announce our partner webinar: Security & Certifications for Critical Embedded Industries! 

wolfSSL and SYSGO have teamed up to integrate wolfSSL’s SSL/TLS crypto library into PikeOS real-time operating system (RTOS), which includes a type 1 hypervisor. With this integration, wolfSSL brings a FIPS crypto library to PikeOS’ certified Separation Kernel in a pre-integrated bundle that ensures robust, proven Security for your project’s architecture.

Join this webinar for a demo in which you can also see two instances of wolfMQTT: One subscriber as the input side, and a publisher as the output side, each utilizing a TLS connection. Learn about the benefits of utilizing the latest TLS 1.3 protocol, for which wolfSSL was the first commercial implementation.

Webinar Date and Time 

The webinar will be offered twice: On September 22nd at 4PM CEST for our customers in the AMER and EMEA region as well as on September 23rd at 9AM CEST for those in the APAC region.

Webinar Registration


After registering, you will receive a confirmation email containing information about joining the webinar.


SYSGO, the European leader in real-time operating systems (RTOS) and hypervisors for certifiable embedded systems, and wolfSSL, the leading provider of TLS and cryptography, have announced that they joined forces to integrate wolfSSL security technology into SYSGO’s PikeOS real-time operating system (RTOS) that includes a separation kernel based type 1 hypervisor. As part of the cooperation, SYSGO will provide pre-integrated wolfSSL technologies into the development environment of PikeOS and its embedded Linux ELinOS product.

Find out more about our partner announcement here:

Are you new to wolfSSL?

wolfSSL focuses on providing lightweight and embedded security solutions with an emphasis on speed, size, portability, features, and standards compliance, such as FIPS 140-2 and 140-3, RTCA DO-178C level A certification, and support for MISRA-C capabilities. wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.2, is up to 20 times smaller than OpenSSL, offers a simple API, an OpenSSL compatibility layer, is backed by the robust wolfCrypt cryptography library, and much more. Our products are open source, giving customers the freedom to look under the hood.

See you there!


Additional Resources 

In the meanwhile, check out the wolfSSL embedded SSL/TLS library, star us on Github, and learn more about the latest TLS 1.3 is available in wolfSSL.  


Contact Us 

Please contact us at with any questions about the webinar and for technical support, please contact or view our FAQ page. As always, there will be a Q&A session following the live presentation. 

Are you curious to learn more about wolfBoot and TPM? 

Check out this fantastic tutorial by Daniele Lacamera about wolfBoot and its TPM capabilities, hosted by our friends at! To watch the recording and slides from the presentation, check out the link below:   

About wolfBoot 

wolfBoot is a portable, OS-agnostic, secure bootloader solution, relying on wolfCrypt for firmware authentication, providing firmware update mechanisms.

  • Multi-slot partitioning of the flash device
  • Integrity verification of the firmware image(s) using SHA2 or SHA3
  • Authenticity verification of the firmware image(s) using wolfCrypt’s digital signature algorithms (ECDSA SECP256R1, Ed25519, RSA 2048/4096)
  • Highly reliable, transport-agnostic firmware update mechanism
  • Anti-rollback protection (via version numbering)
  • Hardware-assisted dual-bank swapping
  • Support for secure keystores, OTP memory, TPM 2.0
  • Support for encrypted firmware images


To learn more:

To watch more videos and tutorials on wolfSSL products, check out our Youtube Channel:

Watch the Tutorial and Download the Slides:

And as always, contact us at facts@wolfssl for general questions and for technical help! 

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