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.

Using Supported Elliptic Curves Extension with wolfSSL

We are back to talk about TLS extensions again. Today we present the addition of Supported Elliptic Curves on wolfSSL!

RFC 4492 introduces five new ECC-based key exchange algorithms for TLS: ECDH_ECDSA, ECDHE_ECDSA, ECDH_RSA, ECDHE_RSA and ECDH_anon. However, it may be desirable in constrained environments to only support a limited number of curves. When a client uses this extension, servers that understands it MUST NOT negotiate the use of an ECC cipher suite unless they can complete the handshake while respecting the choice of curves specified by the client. This eliminates the possibility that a negotiated ECC handshake will be subsequently aborted due to a client’s inability to deal with the server’s ECC key.

To enable the usage of Supported Elliptic Curves in wolfSSL you can simply do:

./configure –enable-supportedcurves

Using Supported Elliptic Curves on the client side requires additional function calls, which should be one of the following functions:


wolfSSL_CTX_UseSupportedCurve() is most recommended when the client would like to enable Supported Curves for all sessions. Setting the Supported Elliptic Curves extension at context level will enable it in all SSL objects created from that same context from the moment of the call forward.

wolfSSL_UseSupportedCurve() will enable it for one SSL object only, so it`s recommended to use this function when there is no need for Supported Elliptic Curves on all sessions.

These functions can be called more than once to indicate the support of multiple curves.

On the server side no call is required. The server will automatically attend to the client`s request selecting ECC cipher suites only if the supported curves are allowed.

All TLS extensions can also be enabled with:

./configure –enable-tlsx

If you have any questions about using TLS Extensions with wolfSSL please let us know at

OCSP in wolfSSL Embedded SSL

Hi!  Do you need OCSP (Online Certificate Status Protocol) in wolfSSL?  We added OCSP as a wolfSSL feature back in 2011.  At this point it is well tested by our users and well into the deployment phase.  More information on the protocol is available here:  The gist of the feature is that a client can go out and check to see the status of a certificate.  OCSP is the modern CRL.

If you have questions about our OCSP support, just email us at

Interesting SmartGrid use case for wolfSSL: ISO 15118

Hi!  If you`re interested in smart grid security, and specifically the security required when connecting an electric car to the smart grid, this post is for you!

wolfSSL has recently been supporting the development efforts of eNterop (as of 26 March 2018 at 9:30m MDT, this link no longer works and has no alternative), which is a group led by Germany`s Federal Ministry of Economics and Technology (BMWi), and includes Germany`s Continental AG, a leading auto parts manufacturer, as well as DaimlerVolkswagenBMW and Siemens.  The eNterop group is putting together an open source implementation of the vehicle-to-grid (V2G) standard ISO 15118.  A component of their open source release will be CyaSSL.  

The standards designers for ISO 15118 knew they had some security critical data flowing between the vehicle and the smartgrid, including billing data, Customer ID, location data, firmware and software updates.  As such, security is a critical part of the standard, and TLS 1.2 is the chosen method, which is where CyaSSL comes in.

As the most widely used embedded implementation of the TLS 1.2 standard, CyaSSL is the ideal choice for electric vehicle to grid security.  

If you`re curious to hear more about CyaSSL in ISO 15118, feel free to contact us at, or call us at +1 425 245 8247.

wolfSSL 2013 Annual Report

2013 was an interesting year in the world of cryptography and computer security.  We have seen and mitigated against attacks such as Lucky13 and watched with interest as existing technologies such as Dual_EC_DRBG have become widely regarded as insecure.  wolfSSL has been happy to provide our users with timely fixes, suggestions, and new technologies to react to the changing application and communication security landscape.

wolfSSL has made significant progress in 2013 as a business and through technical advancements.  As one of the key goals of wolfSSL is to be open source and transparent, highlights of our business, technical, and partner progress throughout the past year are outlined below.

Business and Company Progress

1. Successfully participated in the following events: CES 2013, RSA USA 2013, DESIGN West 2013, Interop 2013, Black Hat 2013, Microchip Masters, and ARM TechCon 2013 – giving a technical presentation on securing embedded devices at the later.
2. Completed a company name change from yaSSL to wolfSSL, better reflecting our company and culture.  To us the wolf represents us well as it is a creature that communicates effectively, works well in groups, and shares with the pack.
3. Added more developers to the team, allowing us to help secure more projects, add new features, and work with partners and open source community members with higher efficiency.
4. Increased activity in onsite consulting to help customers design and validate their security architectures.
5. Experienced a dramatic increase in design wins for wolfCrypt.
6. Doubled our customer base.
7. Continued to support the open source community.
8. Added several new resale, technology, and co-marketing partnerships.
9. Launched our Kickstart consulting service package, making it easier for customers to seamlessly get CyaSSL up and running in their environment.
10. Began the FIPS validation process with CTaoCrypt / wolfCrypt

CyaSSL Technical Progress

A total of four CyaSSL releases were delivered in 2013, each with bug fixes, enhancements, and new feature additions.  Highlights of these releases included:

1. A timely fix for the Lucky13 attack
2. SHA-3 finalist BLAKE2b support (a fast and low resource use hash algorithm)
3. AES-CCM-8 crypto and cipher suites
4. Ability for AES-GCM and AES-CCM to leverage Intel AES-NI
5. Camellia crypto and cipher suites
6. DTLS 1.2 support, including AEAD ciphers
7. DTLS reliability enhancements, IPv6 fixes
8. SHA-384 cipher suites
9. Persistent session and CA cache functionality
10. User atomic record layer processing callbacks
11. Public key callbacks for ECC and RSA
12. HMAC now supports SHA-512
13. New supported TLS Extensions including SNI, SEP, Maximum Fragment Length, Truncated HMAC
14. Ability to unload certs/keys for lower memory use
15. The separation of wolfCrypt from CyaSSL, giving users the ability to use wolfCrypt as a standalone cryptography engine
16. Enhanced examples, including the ability to track memory usage and better IPv6 support
17. Updated CTaoCrypt benchmark app for easier use on embedded systems
18. Updated XCode project files
19. More flexible ./configure options for enabling and disabling features
20. Bug fixes and enhancements in SSL sniffer functionality
21. Enhanced OCSP support with bug fixes and the addition of callbacks
22. Addition of the LeanPSK build option for a small 20kB build
23. Updated and expanded API documentation
24. Release of wolfSSL JNI 1.0, giving Java users a pre-built JNI wrapper around the CyaSSL lightweight SSL library

CyaSSL Porting Progress

1. Release of the CyaSSL Porting Guide
2. Support for Microchip PIC32MX and PIC32MZ and the new MPLAB Harmony development environment
3. Support for version 6 of Microchip’s TCP/IP stack
4. Cavium NITROX support
5. HP/UX support
6. STM32F2 support with hardware crypto and RNG
7. KEIL MDK-ARM and MDK5 project files complete with new CyaSSL software pack for MDK5
8. Better ThreadX support and the addition of NetX I/O callback handlers
9. Freescale Kinetis RNGB support
10. Freescale Kinetis mmCAU support
11. One of our favorite projects, Gearman, now supports CyaSSL

In summary, we had a great year!  2013 was successful for us on multiple fronts, and we look forward to serving our customers and community with ever more secure and functional software in 2014!  As always, your feedback is welcome at!

Software Defined Networking and CyaSSL

Hi!  Someone told us the other day that Software Defined Networking (SDN) is stupid.  No way will SDN ever replace the high end networking gear, we were told.

We were reminded of a scientific study that proved unequivocally that babies are stupid, courtesy of The Onion.  But of course babies grow, and eventually have much greater capabilities, much like SDN will.

We are watching the development of Software Defined Networking (SDN) with a keen eye at wolfSSL.  We already have some users and customers in SDN, and we expect more.  What is more exciting is that the SDN code bases are fresh and new, and the developers of these new SDN switches are released from the legacy decisions that were made 20+ years ago, allowing for a new world of new capabilities.  SDN is networking’s fresh start!  Here’s to what babies can become!

Technologies and Techniques for Securing Connected Devices

wolfSSL will be presenting a session titled “Technologies and Techniques for Securing Connected Devices” at the upcoming 2014 Embedded World Conference in Nürnberg, Germany. If you are going to be attending the conference, we welcome you to come and listen to our presentation.

Technologies and Techniques for Securing Connected Devices
Day: 02.27.2014
Time: 11:30am – 12:00pm
Speaker: Chris Conlon

Connected and smart devices, in conjunction with smart applications, are continually enabling exciting possibilities for the future. As we rely on these systems more frequently in our everyday lives, it is becoming a necessity for them to be designed and implemented with good security practices in mind.

New attacks and vulnerabilities are in the news and media on a daily basis, and as such, it is important that engineers, developers, and managers understand how to be protect applications and devices from such attacks. Security is a broad and often complex field, which can be confusing, overwhelming, and time consuming.

This presentation will introduce several security technologies and techniques for securing smart and connected devices, systems, and applications – giving attendees a good starting place and better understanding for developing secure connected devices for today and into the future. Technologies and techniques covered in this presentation will include a discussion about preventing man-in-the-middle attacks with SSL/TLS, optimizing SSL for resource-limited devices, current industry standards for device security, code signing and secure firmware updates, using hardware cryptography on devices, random number generation, and key generation and storage. 

wolfSSL on Google Glass

Hi!  We received our Google Glass a few weeks ago.  It is a fun new toy for our team!  

After getting through the standard process of playing with them and getting familiar with the tools, we have decided to embark on the coding.  We will port and verify a number of items on Glass, including wolfSSL lightweight TLS, wolfCrypt, and MIT Kerberos.  Should be fun!  Let us know if you have an interest in our wolfCrypt cryptography library running on Glass, as it will be the first of our tools that we bring to the environment.  

If you have questions for us about running any of our projects on Google Glass, then don`t hesitate to email us at, or simply call at +1 425 245 8247.

Using the MIT Kerberos GSS-API with wolfSSL on Android

Are you interested on using the GSS-API with Kerberos on Android? If so, you’ll be happy to hear about wolfSSL’s port of the MIT GSS-API library to Android platform – complete with an org.ietf.jgss (RFC 5653) compatible application programming interface, CyaSSL cryptography integration, and NDK sample application.

You may have read our previous blog entries about porting the MIT Kerberos libraries and CyaSSL embedded SSL library to the Android platform (see link in Reference section, below). With this post, we wanted to take a moment to describe current availability of the Kerberos and GSS-API libraries on Android through the native NDK framework and the Java GSS-API wrapper.

1. Java GSS-API Wrapper

The addition of a Java wrapper around the native MIT GSS-API took part in two stages – a SWIG-generated ( Java interface, which then in turn was used as a building block for a org.ietf.jgss Java API. The individual layers are visualized in the figure below. Both the SWIG layer and the Java GSS-API layer are able to be used in a Java application to access the underlying MIT Kerberos/GSS-API libraries. The SWIG layer is more tedious to use and less standardized than the Java GSS-API layer, but is closer to the C programming API of the native MIT GSS-API. We suggest that Java developers use the org.ietf.jgss Java interface over using the SWIG layer directly. As the org.ietf.jgss interface follows RFC 5653, Java developers should be able to refer to the standard Java documentation for the org.ietf.jgss package for usage instructions and class descriptions.

Source code for this project has been released under the open source MIT license, and is currently available for download on GitHub. Both the Java Generic Security Services API wrappers (SWIG and Java GSS-API), as well as example client and server applications and build instructions are located in the kerberos-java-gssapi package, at the following GitHub URL:

2. Enhanced Example Code

Included in the Java GSS-API package, we have created several example applications to help developers understand how to use this project in their own application. There are two sets of client and server examples provided. The first one is a set of client and server applications which directly use the SWIG-generated Java interface. The second set of applications is a client and server that use the more standardized Java GSS-API interface (org.ietf.jgss).

It is recommended for Java developers to use the Java GSS-API examples, as they demonstrate programming and API usage which is more common in the Java programming language. Before running any of the included examples, the development machine must first have a krb5.conf file and KDC set up correctly to match the principal names used in the examples. For more details about building and running these example applications, please see the README included in the kerberos-java-gssapi package.

3. Sample NDK Application

As one of the main goals of this project was to bring MIT Kerberos/GSS-API support to the Android platform, we have created a sample Android NDK application to serve as an example and reference to Android developers. This sample application provides a GUI wrapper around the MIT Kerberos kinit, klist, kvno, and kdestroy applications. It also provides a sample client using the Java GSS-API interface to connect and communicate with the example server application (from Section 2, above).

This package contains cross-compiled version of the MIT Kerberos libraries, and includes instructions on how to re-compile the Kerberos libraries yourself for the Android platform. For details on how to build and run this example application in the Android emulator, please see the README file located in the NDK application package.

All sources for this sample application are located in the kerberos-android-ndk package, located at the following URL:

wolfSSL looks forward to seeing what kinds of applications will use this functionality. If you have any questions, comments, or feedback, we would enjoy to hear it! Please contact us directly at


MIT Kerberos:
Initial announcement:

Team wolfSSL

More Dual_EC_DRBG News

It was reported yesterday in The Guardian and elsewhere that the NSA paid RSA $10M to set Dual_EC_DRBG as their default PRNG.  See the news here:  

As we have previously stated, we never implemented Dual_EC_DRBG in any of our products, much less set it as default, because of its suspect nature.  If you`re not familiar with Dual_EC_DRBG, the background on wikipedia is here:

For even more background, here`s a great Black Hat talk by Derek Soeder, Christopher Abad, and Gabriel Acevedo from Cylance on the subject of breaking Pseudorandom Algorithms.

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