So, what’s new at wolfSSL? Take a look below to check out the most recent news, or sign up to receive weekly email notifications containing the latest news from wolfSSL. wolfSSL also has a support-specific blog page dedicated to answering some of the more commonly received support questions.

Targets supported by wolfBoot

Designed by Freepik:

Here at wolfSSL, we pride ourselves on the portability of our products. An essential part of the real-world applicability of our projects is that they can run in various environments in support of various use cases. We recently published an incomplete list of parts that our SSL/TLS library wolfSSL has been run on. Since our secure bootloader wolfBoot shares the same flexibility, we wanted to share a similar list of supported targets and architectures.

Here’s a list of supported CPU architectures:

CPU Architectures
ARMv6-M Cortex-M0
ARMv7-A Cortex-A9
ARMv7-M Cortex-M3
ARMv7-M Cortex-M4
ARMv7-M Cortex-M7
ARMv7-R Cortex-R5
ARMv8-A Cortex-A53
ARMv8-A Cortex-A57
ARMv8-M Cortex-M33
PowerPC 32-Bit
PowerPC 64-Bit
RV32 32-Bit RISC-V
Intel x86 32-Bit
Intel x86 64-Bit
RXv3 core

Here’s a list of supported hardware parts and their manufacturers:

Part Manufacturer
Xilinx UltraScale+ ZCU102 AMD
PSoC 62S2 Infineon/Cypress
i.MX-RT1050 NXP/Freescale
i.MX-RT1060 NXP/Freescale
i.MX-RT1064 NXP/Freescale
Kinetis K64 NXP/Freescale
Kinetis K82 NXP/Freescale
QorIQ P1021 NXP/Freescale
QorIQ T1024 NXP/Freescale
QorIQ T2080 NXP/Freescale
QorIQ LS1028A NXP/Freescale
LPC54xxxx NXP/Freescale
nRF5280 Nordic
11th Gen Core i7 (Tiger Lake) Intel
PI3 RaspberryPi
RX72N Renesas
RA6M4 Renesas
STM32C0xx ST Microelectronics
STM32F4xx ST Microelectronics
STM32F7xx ST Microelectronics
STM32G0xx ST Microelectronics
STM32H7xx ST Microelectronics
STM32L0xx ST Microelectronics
STM32L4xx ST Microelectronics
STM32L5xx ST Microelectronics
STM32U5xx ST Microelectronics
STM32WBxx ST Microelectronics
HiFive1 SiFive (RISC-V)
ATSAMR21 Microchip (Atmel)
TM4C1294xx Texas Instruments
TMS570lc4xx Texas Instruments
CC26x2 Texas Instruments

For info on the wolfBoot configuration details of the targets listed above, visit For wolfBoot usage examples, visit

Don’t see your part/architecture on this list? Not to worry! The minimalistic design and tiny HAL API of wolfBoot make it portable to the highest degree. Reach out to us letting us know the details of your system and we can get you in touch with our porting experts.

If you have questions, comments, and suggestions about any of the above, contact us at or call us at +1 425 245 8247.

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XMSS and LMS in wolfBoot and wolfCrypt for CNSA 2.0

Designed by Freepik:

Have you seen the recently released wolfBoot v2.0.0? It is full of a lot of interesting new features and optimizations. You can see full detail in the changelog.

What about the CNSA 2.0 Guidance? We’ve mentioned it many times in our blog posts. You can find it here.

You might be wondering, what do these have to do with each other? The NSA’s CNSA 2.0 guidance specifically states that LMS/HSS and XMSS/XMSS^MT are appropriate for firmware signing. These algorithms are now supported in the 2.0.0 release of wolfBoot. They depend on our LMS and XMSS integrations in wolfCrypt which are part of the recently released 5.6.4 version of wolfSSL! So, you can start working with these algorithms and signing and verifying your firmware images TODAY.

Being able to do that today is really important because the CNSA 2.0 says that LMS/HSS and XMSS/XMSS^MT are to be added as an option and tested in your systems and products today. By 2025, only a year from now, these algorithms are to be the default and preferred algorithms. By 2030, all other algorithms are to be phased out.

Are you ready to meet these expectations? You are if you use wolfBoot!

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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Keystores and Secure Elements supported by wolfSSL/wolfCrypt

When looking to store your cryptographic secrets, it is important to have a good platform to store them on. Even more important is the ease of accessing and using those secrets. With wolfTPM, we have already added support for the following platforms:

  • Raspberry Pi (Linux)
  • MMIO (Memory mapped IO)
  • STM32 with CubeMX
  • Atmel ASF
  • Xilinx (Ultrascale+ / Microblaze)
  • QNX
  • Infineon TriCore (TC2xx/TC3xx)
  • Barebox

These TPM (Trusted Platform Module) 2.0 modules are tested and running in the field:

  • Infineon OPTIGA SLB9670/SLB9672
  • Microchip ATTPM20
  • Nations Tech Z32H330TC
  • Nuvoton NPCT650/NPCT750

For direct Secure Element access, we have ports in wolfSSL for:

Wolfcrypt has support for the following:

For more detailed information on our supported hardware take a look at our Hardware Support list.

We also offer support for PKCS11 to interface to various HSMs like:

  • Infineon TriCore Aurix
  • Renesas RH850
  • ST SPC58

Wolfcrypt also gives support for PSA (Platform Security Architecture). This includes the following algorithms:

  • hashes: SHA-1, SHA-224, SHA-256
  • ECDH PK callbacks (P-256)
  • ECDSA PK callbacks (P-256)
  • RNG

Another product of interest could be wolfBoot, which – as the name suggests – is a bootloader that can use an HSM (Hardware Security Module) for validation and verification. It supports use of the ARM TrustZone technology. WolfBoot also supports all of the TPMs and secure elements listed above, as it inherits all of wolfCrypt’s capabilities. WolfBoot can also be used in an fTPM (Firmware TPM) environment where the bootloader code is running on the same device as the one providing TPM functionality.

If you have questions about any of the above, please contact us at, call us at +1 425 245 8247 or view our FAQ page.

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Partnership News: wolfSSL and Weston Embedded Solutions

wolfSSL is proud to partner with Weston Embedded Solutions, developers of the Cesium RTOS line of real time kernels and protocol stacks for embedded systems. Weston Embedded Solutions and their products trace their roots back to Micrium and the popular uC/OS software that pioneered the use of real time kernels more than 30 years ago. Cesium RTOS is popular among customers demanding real time performance and proven reliability in the most critical embedded applications. This partnership allows wolfSSL to broaden its portfolio of supported real time operating systems giving customers integrated access to the most reliable and trusted embedded kernels and middleware components.

The combination of wolfSSL’s state-of-the-art SSL/TLS library and Weston Embedded Solutions’ highly reliable Cesium RTOS provide a level of protection that is simply unmatched in the industry. Customers can now enjoy enhanced security and performance, reduced development time, and increased flexibility in their embedded systems.

The ultra configurability of wolfSSL will let you make the optimizations and trade offs that make the most sense for you. Whether your application requires a small code size, no stack usage, no heap usage, minimal memory usage or blazing performance, wolfSSL and Weston Embedded Solutions will get you where you need to be.

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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wolfBoot: support for post-quantum secure-boot with XMSS/XMSS^MT signatures

Designed by Freepik:

wolfBoot v2.0 is here, and with it a number of new features and enhancements. Rounding out our post-quantum support, in addition to LMS/HSS, wolfBoot now supports the XMSS/XMSS^MT post-quantum stateful hash-based signature (HBS) scheme. XMSS is the eXtended Merkle Signature Scheme, while XMSS^MT is its multi-tree generalization that allows it to scale efficiently into a large number of signatures by constructing a hypertree from layers of XMSS subtrees.

Like our previous LMS support, XMSS wolfBoot support includes keygen, signing, verifying, and importing externally generated public keys. Furthermore, XMSS wolfBoot support builds on our previous XMSS wolfCrypt integration, and thus supports all SHA256 parameter sets from tables 10 and 11 of NIST SP 800-208, while also allowing for hardware acceleration of hash operations when computing the hash-chains needed for XMSS signatures.

Thus wolfBoot now supports both post-quantum stateful HBS schemes recommended by NIST SP 800-208 and the NSA’s CNSA 2.0 suite. Do you have a post-quantum secure-boot requirement from the CNSA 2.0 timeline? Are you curious about integrating post-quantum support into your secure-boot process? If so, please contact us at

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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wolfBoot support for Renesas RX72N

Designed by @Noxifer81

We are excited to announce wolfBoot’s support for the Renesas RX72N. The RX72N MCU is the flagship model of RX series, using a 32-bit RX72N 240 MHz microcontroller.

wolfBoot is a portable secure bootloader solution that offers firmware authentication and firmware update mechanisms. Due to its minimalistic design and tiny HAL API, wolfBoot is completely independent from any OS or bare-metal application.

By adding wolfBoot support for the board, it demonstrates simple secure firmware update by wolfBoot. A sample application v1 is securely updated to v2. Both versions behave the same except displaying its version of v1 or v2. They are compiled by e2Studio and run on the target board. Detailed steps to run the application can be found at GitHub README.

Additionally, you are able to run wolfBoot with Renesas TSIP (Trusted Secure IP) driver, which supports high-speed hardware encryption. You can find the Readme at wolfBoot GitHub.

Current support for Renesas TSIP driver acceleration includes:

  • SHA256/RSA

If interested in trying wolfBoot on the RX72N or have questions about any of the above, please contact or call us at +1 425 245 8247.

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Live Webinar: Mastering libcurl with Daniel Stenberg

We are excited to invite you to our upcoming two-part webinar series on Mastering libcurl, presented by the founder and lead developer of cURL and libcurl, Daniel Stenberg. The first part will take place on November 16th at 9 AM PT, and the second part is scheduled for November 20th at 9 AM PT.

Save the date

Part 1: November 16th at 9 AM PT

Part 2: November 20th at 9 AM PT

Sneak peek of the webinar

  • Getting started with cURL
  • API and Architecture
  • Functional Features
  • Advanced Functionality
  • HTTP, URLs and more

libcurl is a powerful tool that has revolutionized the way developers interact with the internet. Whether you’re a seasoned programmer or a curious novice, this webinar is the perfect opportunity to unlock your potential and discover the endless possibilities of libcurl.

Don’t miss out on this exclusive webinar to learn from the founder of cURL and take your development skills to the next level. Register now and join us for an unforgettable deep dive into the world of libcurl.

Check out Daniel’s blog for more details.

As always, our webinars will include Q&A sessions throughout. If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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wolfSSL Release 5.6.4

wolfSSL version 5.6.4 is now available! This update introduces a number of exciting new features. We’ve added post-quantum support to DTLS 1.3, expanded sniffer support with keylog use, integrated post-quantum stateful hash-based signature schemes like LMS/HSS and XMSS/XMSS^MT, introduced Ada bindings, expanded our range with additional SM2 cipher suites, and incorporated AES EAX mode, and much more! Alongside these enhancements, the release brings quality improvements and addresses one identified vulnerability. You can review the full rundown of updates in the included Here’s a breakdown of the latest features and enhancements:

New Feature Additions

  • DTLS 1.3 PQC: support fragmenting the second ClientHello message. This allows arbitrarily long keys to be used, opening up support for all PQC ciphersuites in DTLS 1.3.
  • SM2/SM3/SM4: Chinese cipher support including TLS 1.3 and 1.2 cipher suites. SM2 SP math implementation available for improved performance and minimum size. Bare metal support available.
  • Ability to parse ASN1 only with SMIME_read_PKCS7
  • Added support for MemUse Entropy on Windows
  • Added Ada Bindings for wolfSSL, benefiting Ada language users who need to add security and FIPS to their designs.
  • Added a PEM example that converts to and from DER/PEM.
  • Added LMS/HSS and XMSS/XMSS^MT stateful hash-based signature scheme wolfcrypt hooks, both normal and verify-only options. wolfBoot, wolfSSH, and wolfSSL will inherit this functionality from wolfCrypt for users moving to CNSA 2.0
  • Added support for the AES EAX mode of operation
  • Port for use with Hitch ( added
  • Add XTS API’s to handle multiple sectors in the new port to VeraCrypt. VeraCrypt users now have access to FIPS based encryption of wolfCrypt.
  • Sniffer tool now supports decrypting TLS sessions using secrets obtained from a SSLKEYLOGFILE

Enhancements and Optimizations

  • Turned on SNI by default on hosts with resources
  • Improved support for Silicon Labs Simplicity Studio and the ERF32 Gecko SDK
  • Thumb-2 and ARM32 Curve25519 and Ed25519 assembly have significantly improved performance.
  • Thumb-2 AES assembly code added.
  • Thumb-2 and ARM32 SP implementations of RSA, DH and ECC have significantly improved performance.
  • Minor performance improvements to SP ECC for Intel x64.
  • AES-XTS assembly code added for Intel x64, Aarch64 and ARM32 to dramatically improve performance
  • Added support for X963 KDFs to ECIES.
  • Added 32-bit type only implementation of AES GMULT using tables.
  • Add support for nginx version 1.25.0 for those using nginx with wolfSSL
  • Add support for Kerberos version 5 1.21.1
  • Check all CRL entries in case a single issuer has multiple CRL’s loaded
  • CRL verify of the entire chain including loaded CA’s
  • Added example for building wolfSSL as an Apple universal binary framework using configure

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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wolfBoot v2.0.0

Designed by @Noxifer81

The long awaited version 2.0.0 of our bootloader is finally out!

Here is a summary of some of the new key features, selected from the full changelog, available at github.

Post-Quantum secure boot

As previously announced in a recent blog post, wolfBoot 2.0.0 supports post-quantum secure boot.
wolfBoot 2.0.0 is, to our knowledge, the first secure bootloader supporting post-quantum stateful hash-based signature (HBS) schemes for firmware verification.Thanks to the support for LMS/HSS and XMSS/XMSS^MT recently added in wolfCrypt and the integration with third-party signing entities, such as HSM providers, we successfully added HBS schemes to the list of supported algorithms.

wolfBoot as TrustZone-M secure supervisor

The latest generation of ARM Cortex-M microcontroller has introduced a hardware-assisted Trusted Execution Environment (TEE), called TrustZone-M. By installing wolfBoot to secure the boot process on those devices, it is now possible to extend the cryptography library linked with the bootloader to cover multiple algorithms and key lengths beyond those required to implement the secure boot mechanism. An application or operating system running in non-secure mode has access to all those cryptographic operations provided by wolfBoot, through a non-secure-callable API, that is accessible through standard PKCS#11 function calls.
An extended description of this feature has been previewed in a blog post we have recently published.

Advanced TPM features

Since the early days of wolfBoot development, we have been researching the integration with wolfTPM and the unique opportunities it offers to communicate with TPM devices in the very early stages of the target’s boot up process. With wolfBoot 2.0, we expanded this integration to include some new powerful features. Among other things, TPM 2.0 devices can now be used as Root of Trust for the boot process. The extension of the PCRs can be customized according to the specific characteristic of the boot mechanism, to easily implement measured boot at different stages. Moreover, wolfBoot can now seal and unseal non-volatile memory slots in the TPM based both on the verification of externally signed PCR policy and/or password based sealing.

Full support for secure boot on Intel x86-64 bit targets

Adding support for x86-64 targets using Intel’s Firmware Support Packages (FSP) in wolfBoot 2.0.0 has paved the way to controlling the entire secure boot mechanism from the machine power-on. This gives a key advantage in keeping the entire boot process secure on x86-based Single-board Computer systems (SBC). wolfBoot 2.0 boot flow is divided into two stages. The first stage includes basic memory, silicon initialization, PCI enumeration and the interaction with hardware-assisted security mechanisms. The first stage will then verify the second stage and pass control to it. The second stage is responsible for AHCI initialization, SATA disk locking/unlocking, TPM interaction to unseal secrets, verification of entire disk partitions or images and finally staging the image. It supports different payloads: raw images, Linux kernel, or Multiboot2/ELF images.

Find out more about wolfBoot! Download the source code and documentation from download page, or clone the repository from github. If you have any questions about any of the above, comments or suggestions, please contact us at or call us at +1 425 245 8247.

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wolfMQTT Releases v1.17.0

The latest release of wolfMQTT, v1.17.0, is now available! This release has several bug fixes and optimizations including:

Release 1.17.0 has been developed according to wolfSSL’s development and QA process and successfully passed the quality criteria.

Check out the changelog from the download for a full list of features and fixes, or contact us at with any questions.

While you’re there, show us some love and give the wolfMQTT project a Star!

You can download the latest release of wolfMQTT today Or clone directly from our GitHub repository.

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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