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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 Zephyr Port

With wolfSSL 4.0.0, the wolfSSL embedded SSL/TLS library comes with many new features and improved functionality. Among these features is the addition of a port to the Zephyr Project - a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with safety and security in mind.

wolfSSL's Zephyr port comes with multiple test and example applications, such as the wolfCrypt unit tests, wolfSSL TLS with sockets, and wolfSSL TLS with threads example applications. This Zephyr port allows for its users to easily implement lightweight, high-speed and strong encryption for secure data transfer on their devices. As both Zephyr and wolfSSL are targeted for resource-constrained and embedded devices, this combination only makes sense.

More information about the 4.0.0 release of wolfSSL can be found in our blog post here:

For other information or queries, please contact

wolfSSH SSHv2 Server Library

wolfSSL provides many products, services, and support for almost all things TLS and embedded. One of these products provided by wolfSSL is wolfSSH - an SSHv2 server library!

wolfSSH is wolfSSL's own open-source and dual-licensed implementation of the SSHv2 protocol. It's a server library written in ANSI C and targeted for embedded/RTOS/resource-constrained environments. It's fast, has a small code size, and an extensive feature set.  This feature set includes items such as SCP support, SFTP support, PEM and DER certificate support, and also hardware cryptography for supported devices! This comes from wolfSSH's leverage of the wolfCrypt crypto engine for its cryptographic operations.

wolfSSH can be downloaded from the wolfSSL download page (located here:, or from a git-clone of the wolfSSH GitHub repository (located here:

Additionally, wolfSSL provides support and maintenance for all of its products, wolfSSH included. More information on wolfSSH support and maintenance can be found on the wolfSSL support page, located here:

For more information on wolfSSH or related products, please contact

wolfSSL at ESC Boston 2019

wolfSSL is at ESC Boston this year! Embedded Systems Conference is the largest event of its kind in the US, featuring two days of leading industry education in embedded hardware, embedded software, IoT and connected devices, and advanced technologies, as well as a free two-day supplier showcase.

Where ESC Boston will be held for 2019:
Venue: Boston Convention and Exhibition Center
wolfSSL Booth #: 965
When: May 16-17

Stop by our booth to hear more about the wolfSSL embedded SSL/TLS library, the wolfCrypt encryption engine, to meet the wolfSSL team, or to get some free stickers and swag!

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

More information about IoT World can be found here:

wolfSSL at IoT World 2019

wolfSSL is at IoT World this year! IoT World 2019 features pre-conference workshops and a Hackathon, Executive keynotes, conference tracks and a sprawling expo floor, all at the Santa Clara Convention Center. Join fellow IoT professionals in discovering the newest and most influential IoT innovations and developments. For 2019, IoT World will be held in Santa Clara, CA.

Where IoT World will be held for 2019:
Venue: Santa Clara Convention Center
wolfSSL Booth #: 1045
When: May 14-16

Stop by our booth to hear more about the wolfSSL embedded SSL/TLS library, the wolfCrypt encryption engine, to meet the wolfSSL team, or to get some free stickers and swag!

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

More information about IoT World can be found here:

wolfSSL Asymmetric Cryptography Support

One of the software libraries that is provided by wolfSSL includes the wolfCrypt crypto engine. wolfCrypt includes support for single-precision math, ECC, extensive list of supported ciphers, key/certificate generation, and also Asymmetric cryptography! Asymmetric cryptography differs from regular (synchronous) cryptography that instead of using a singular shared key, they will use a key-value pair. Popular algorithms where this is found include RSA, DH, and ECC - which are algorithms supported and implemented by wolfSSL!

wolfSSL's implementation of these Asymmetric algorithms can also be tuned based on the user's needs as well. For example, if a user requires the same security offered by these algorithms in combination with high performance fast encryption, wolfSSL has the options (or corresponding macro definitions) --enable-fastmath and --enable-fast-rsa available for use. Additionally, if a user needs to improve protection against attacks targeting implementations of these algorithms, wolfSSL has options to improve the security of its implementations of these Asymmetric algorithms. The options for these improvements are --enable-maxstrength and --enable-harden. These options can also be enabled by adding their corresponding defines within the settings file that is in use by the system, and are listed below:

  • --enable-fastmath corresponds with USE_FAST_MATH
  • --enable-fast-rsa has many different defines that would be used for many different devices, as hardware encryption and architecture comes in to play. It also requires the user have fast RSA libraries in place. Please contact for assistance with enabling this.
  • --enable-maxstrength corresponds with WOLFSSL_MAX_STRENGTH
  • --enable-harden corresponds with TFM_TIMING_RESISTANT, ECC_TIMING_RESISTANT, and WC_RSA_BLINDING if using rng.

For more information about wolfSSL or wolfCrypt's implementation of various algorithms, please contact

wolfSSL DTLS Session Export

The wolfSSL embedded SSL/TLS library supports features not only pertaining to TLS, but DTLS as well! A prime example of a DTLS feature supported by wolfSSL is DTLS session exporting. This allows for serializing and sending a DTLS session immediately after the handshake has been completed. The ability to export the session after a handshake is established has many practical use cases in IoT and embedded environments.

In establishing and maintaining a DTLS connection the handshake portion is the most resource intensive. With this additional feature it is possible to offload the handshake onto a more powerful system, serialize and export it after the handshake is completed, and then have throughput handled by a more resource constrained device.

For more information about wolfSSL and DTLS, or just wolfSSL, please contact

wolfSSL also supports TLS 1.3! More information can be found here:

wolfSSL Adds Support for the Deos Safety Critical RTOS

Are you a user of Deos?  If so, you will be happy to know that wolfSSL recently added support for Deos RTOS and added TLS client/server examples to the wolfSSL embedded SSL/TLS library for Deos!

Deos is an embedded RTOS used for safety-critical avionics applications on commercial and military aircraft. Certified to DO-178C DAL A, the time and space partitioned RTOS features deterministic real-time response and employs patented “slack scheduling” to deliver higher CPU utilization. DO-178C DAL A refers to a specification that is required for software to be used in aerospace software systems. 

The Deos port in wolfSSL is activated by using the "WOLFSSL_DEOS" macro. For instructions on how to build and run the examples on your projects, please see the “<wolfssl-root>/IDE/ECLIPSE/DEOS/README” file.  This support is currently located in our GitHub master branch, and will roll into the next stable release of wolfSSL as well.

wolfSSL provides support for the latest and greatest version of the TLS protocol, TLS 1.3! Using the wolfSSL port with your device running Deos will allow your device to connect to the internet in one of the most secure ways possible.

For more information, please contact

The most recent version of wolfSSL can be downloaded from our download page, here:
wolfSSL GitHub repository:
wolfSSL support for TLS 1.3:
Deos RTOS homepage:

wolfBoot – wolfSSL’s Secure Bootloader

wolfBoot is wolfSSL's own implementation of a secure bootloader that leverages wolfSSL's underlying wolfCrypt module to provide signature authentication for the running firmware.

The role of a secure bootloader is to effectively prevent the loading of malicious or unauthorized firmware on the target. Additionally, wolfBoot provides a fail-safe update mechanism, that can be interrupted at any time, and resumed at next boot.

wolfBoot is designed to be a portable, OS-agnostic, secure bootloader solution for all 32-bit microcontrollers, relying on wolfCrypt for firmware authentication.

Due to its minimalist design and the tiny Hardware Abstraction Layer (HAL) API, wolfBoot is completely independent of any OS or bare-metal application, and can be easily ported and integrated into existing embedded software solutions.

wolfBoot provides the basis for secure firmware update (OTA) management at boot time, cutting down the development effort needed to implement and validate the required mechanisms to handle the updates. It reduces the development effort to just receiving the image using a secure channel within the application/OS. We recommend using wolfSSL to encrypt the firmware transfer over TLS, to avoid eavesdropping. Once the image is transferred and stored into the update partition, wolfBoot takes care of the update procedure at the next boot.

Remote updates that would lead to a faulty firmware are automatically reverted by wolfBoot after the first 'test' boot, by restoring the original firmware image whenever the update has failed to boot properly. This mechanism protects the target device from accidental updates on the field.

wolfBoot can be downloaded from the wolfSSL download page here:

More about boot loaders can be found here:
More about wolfSSL:
More about wolfCrypt:

Additionally, wolfSSL will be at ICMC in a couple of weeks! Be sure to stop by booth #103 and say hello!

Contact for any questions or for more information

wolfSSH Version 1.4.0 Now Available

Version 1.4.0 of the wolfSSH SSHv2 server library has been released! Many new and exciting features were added to wolfSSH with this release. Some of the new additions include: support for port forwarding, client side pseudo terminal support, enhancements for non blocking use, AES-CTR cipher support, and support for SFTP on windows.

This release also includes fixes and enhancements to existing features. Some of the fixes include resolving GCC-7 warnings and fixes for example use cases when wolfSSL ECC caching is turned on.

A full list of notable addition and fixes is as follows:

  • SFTP support for time attributes
  • TCP port forwarding feature added (--enable-fwd)
  • Example TCP port forwarding added to /examples/portfwd/portfwd
  • Fixes to SCP, including default direction set
  • Fix to match ID during KEX init
  • Add check for window adjustment packets when sending large transfers
  • Fixes and maintenance to Nucleus port for file closing
  • Add enable all option (--enable-all)
  • Fix for --disable-inline build
  • Fixes for GCC-7 warnings when falling through switch statements
  • Additional sanity checks added from fuzz testing
  • Refactor and fixes for use with non blocking
  • Add extended data read for piping stderr
  • Add client side pseudo terminal connection with ./examples/client/client -t
  • Add some basic Windows terminal conversions with wolfSSH_ConvertConsole
  • Add wolfSSH_stream_peek function to peek at incoming SSH data
  • Change name of internal function from SendBuffered to wolfSSH_SendPacket to avoid clash with wolfSSL
  • Add support for SFTP on Windows
  • Use int types for arguments in examples to fix Raspberry Pi build
  • Fix for fail case with leading 0’s on MPINT
  • Default window size (DEFAULT_WINDOW_SZ) lowered from ~ 1 MB to ~ 16 KB
  • Disable examples option added to configure (--disable-examples)
  • Callback function and example use added for checking public key sent
  • AES CTR cipher support added
  • Fix for freeing ECC caches with examples
  • Renamed example SFTP to be examples/sftpclient/wolfsftp

The most up-to-date versions of wolfSSH and other wolfSSL products can be found on the wolfSSL download page here:

For more information about wolfSSH or the changes incorporated into the 1.4.0 release, please contact

wolfSSL at ICMC 2019

wolfSSL is at ICMC this year! The International Cryptographic Module Conference (ICMC) attracts hundreds of cryptographic professionals from across the Pacific to address the unique challenges faced by the people who develop, produce, test, specify, and use cryptographic modules, with an emphasis on FIPS 140-2, ISO/IEC 19790 and Common Criteria standards. For 2019, ICMC will be held in Vancouver, BC.

Where ICMC will be held for 2019:
Venue: JW Mariott Parq Vancouver
wolfSSL Booth #: 103
When: May 15-16

Additionally, wolfSSL founder and CTO Todd Ouska will be on the panel for the track session "Panel on TLS: The Problems in Moving to 1.3". Stop by the Cambie space to learn more about the problems in upgrading to the newest version of TLS (Friday, May 17th, at 10:30am)

Stop by our booth to hear more about the wolfSSL embedded SSL/TLS library, the wolfCrypt encryption engine, to meet the wolfSSL team, or to get some free stickers and swag!

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

More information about ICMC can be found here:

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