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.

World IPv6 Day

June 8, 2011 (this Wednesday) is World IPv6 Day, a day that several major organizations will offer content over IPv6 during a 24-hour time period. As stated on the ISOC website, “the goal of the test flight day is to motivate organizations across the industry – Internet service providers, hardware makers, operating system vendors and web companies – to prepare their services for IPv6 to ensure a successful transition as IPv4 addresses run out.”

Organizations who are taking part in World IPv6 Day include Google, Facebook, Yahoo, Akamai, Limelight Networks, CISCO, Comcast, and many more. You can find the entire list of stated participants here,

wolfSSL has support for IPv6 as well! wolfSSL was designed as IP neutral, and will work with both IPv4 and IPv6. The test applications included in the wolfSSL download currently default to using IPv4 (to apply to a broader number of systems). In order to change the test applications to use IPv6, use the –enable-ipv6 option while building the wolfSSL embedded SSL library.

Are you prepared for IPv6 Day? To test your current browser setup for World IPv6 Day, you can visit the following pages (which will run a test on your browser setup):

Google`s IPv6 Test Page:
ISOC IPv6 Test Page:

To learn more about IPv6 in general, visit the Wikipedia page, here: As always, if you have questions or comments about the wolfSSL embedded SSL library or the yaSSL Embedded Web Server, please let us know at

wolfSSL 2.0 rc2 Release

The 2nd and possible final release candidate for wolfSSL 2.0 is now available.  This release contains bug fixes for Alert processing and DTLS with DHE.  New features include:

– FreeRTOS support
– lwIP support
– Wshadow warnings removed
– ctc_ prefix for CTaoCrypt headers (manual still being updated for this)
– asn public header for better collision avoidance

Stay tuned for more detailed explanations of the new features that haven`t been covered in our blog series yet.  For questions or comments about this release or embedded SSL in general please contact the yaSSL team at

The State of SSL on the Internet with Ivan Risti?

Ivan Risti?, Director of Engineering at Qualys, Inc., will be presenting the results of the first publicly-available survey aimed at assessing the state of SSL on the Internet. His results will be presented through a free webcast on June 22, 2011 at 2:00 PM EDT. The presentation will also provide documentation and free tools to test and improve the configuration on SSL servers. If you are interested in listening to SSL Labs` results, you can register for the free webcast using the following link.

Qualys SSL Labs:

wolfSSL Competitive Upgrade Program

One of the services that yaSSL provides is the wolfSSL Competitive Upgrade Program. With this program, yaSSL offer competitive upgrade pricing for those who wish move from an outdated or expensive SSL library to wolfSSL with low cost and minimal disturbance to their code base.    
Here’s an outline of the Competitive Upgrade Program:
1. You need to currently be using a commercial competitor to wolfSSL.
2. You will receive up to two weeks of on-site consulting to switch out your old SSL library with wolfSSL.  Travel expenses are not included.
3. Normally, two weeks is the right amount of time for us to make the replacement in your code and do initial testing.  Additional consulting on a replacement is available as needed.
4. You will receive the standard wolfSSL royalty free license to ship with your product.
5. The price is $10,000.
The purpose of this program is to enable users who are currently spending too much on their embedded SSL implementation to move to wolfSSL with ease.  If you are interested in learning more, or interested in how wolfSSL compares to what you are currently using, then please contact us at

wolfSSL now has lwIP support

The wolfSSL embedded SSL/TLS library supports lwIP, the light weight internet protocol implementation, out of the box.  The user merely needs to define WOLFSSL_LWIP or uncomment the line /* #define WOLFSSL_LWIP */ in os_settings.h to use wolfSSL with lwIP.

The focus of lwIP is to reduce RAM usage while still providing a full TCP stack.  That focus makes lwIP great for use in embedded systems, the same area where wolfSSL is an ideal match for SSL/TLS needs.  An active community exists with contributor ports for many systems.  Give it a try and let us know if you have any suggestions or questions.

For the latest news and releases of lwIP, you can visit the project homepage, here:

For more information, please contact

TLS 1.2 Support in CyaSSL

The CyaSSL embedded SSL library has had support for TLS 1.2 since version 1.1.0 in September of 2009 (over a year and a half ago).  We realize that many people don’t know the difference between TLS 1.1 and TLS 1.2, and we wanted to give some quick highlights on the differences between these two protocol versions.

As stated in the TLS 1.1 and 1.2 protocol definitions (RFC 4346, RFC 5246), “The primary goal of the TLS protocol is to provide privacy and data integrity between two communicating applications.”  TLS 1.2 is an improvement to the TLS 1.1 standard, but how exactly do they differ?  What was changed in TLS 1.2 to warrant a new version of the protocol?

Listed below are the changes made in version 1.2 of the TLS protocol.  TLS 1.2 support is slowly making it’s way into existing projects.  CyaSSL fully supports SSL 3.0, TLS 1.0, TLS 1.1, and TLS 1.2.

  1. A. TLS 1.2

This protocol was defined in RFC 5246 in August of 2008.  Based on TLS 1.1, TLS 1.2 contains improved flexibility. One of the primary goals of the TLS 1.2 revision was to remove the protocol’s dependency on the MD5 and SHA-1 digest algorithms.  The major differences include:

  1. The MD5/SHA-1 combination in the pseudorandom function (PRF) was replaced with cipher-suite-specified PRFs.

  2. The MD5/SHA-1 combination in the digitally-signed element was replaced with a single hash.  Signed elements include a field explicitly specifying the hash algorithm used.

  3. There was substantial cleanup to the client’s and server’s ability to specify which hash and signature algorithms they will accept.

  4. Addition of support for authenticated encryption with additional data modes.

  5. TLS Extensions definition and AES Cipher Suites were merged in.

  6. Tighter checking of EncryptedPreMasterSecret version numbers.

  7. Many of the requirements were tightened

  8. Verify_data length depends on the cipher suite

  9. Description of Bleichenbacher/Dlima attack defenses cleaned up.

  10. Alerts must be sent in many cases

  11. After a certificate_request, if no certificates are available, clients now MUST send an empty certificate list.

  12. TLS_RSA_WITH_AES_128_CBC_SHA is now the mandatory to implement cipher suite.

  13. Added HMAC-SHA256 cipher suites.

  14. Removed IDEA and DES cipher suites.  They are now deprecated.

To read more about TLS 1.2, you can find the specification (RFC 5246), here:

B.  Goals of the TLS Protocol

  1. Cryptographic security: TLS should be used to establish a secure connection between two parties.

  2. Interoperability: Independent programmers should be able to develop applications utilizing TLS that can successfully exchange cryptographic parameters without knowledge of one another’s code.

  3. Extensibility: TLS seeks to provide a framework into which new public key and bulk encryption methods can be incorporated as necessary.  This will also accomplish two sub-goals: preventing the need to create a new protocol (and risking the introduction of possible new weaknesses) and avoiding the need to implement an entire new security library.

  4. Relative efficiency: Cryptographic operations tend to be highly CPU intensive, particularly public key operations.  For this reason, the TLS protocol has incorporated an optional session caching scheme to reduce the number of connections that need to be established from scratch.  Additionally, care has been taken to reduce network activity.


If you would like to read more about SSL or TLS, here are several resources that might be helpful:

TLS – Wikipedia (

TLS 1.0 (RFC 0000):

TLS 1.1 (RFC 0000):

TLS 1.2 (RFC 0000):

As always, if you have any questions or would like more information about the CyaSSL embedded SSL library or the yaSSL Embedded Web Server, please contact

wolfSSL 2.0 Release In Progress

If you`ve been keeping an eye on our blog lately, you`ve probably noticed our series of blog posts about new features and changes we have made in wolfSSL 2.0. If you`re as excited as we are about our next release, we hope you enjoy the following video link:

Release Candidate 1 for wolfSSL 2.0 is available for download from our “Download” page (link). We invite you to download it and take it for a spin. Let us know about any bugs or problems you run into, and if you have any suggestions to make our 2.0 release more robust we`d love to hear them. Please send any comments or questions to

Team yaSSL

wolfSSL 2.0 New Features – Part 3

Here`s the third part in a four part series giving a more detailed report on some of the new features present in the recent wolfSSL release.

• Runtime hooks for logging.  The wolfSSL embedded SSL library has had the ability to do logging when debug is enabled for some time.  Now, logging callback functions can be registered at runtime to provide some more flexibility with how logging is done.  The logging callback can be registered with:

int wolfSSL_SetLoggingCb(wolfSSL_Logging_cb log_function);

typedef void (*wolfSSL_Logging_cb)(const int logLevel,
                                 const char *const logMessage);

The log levels can be found in logging.h and the implementation is in logging.c.  By default, wolfSSL logs to stderr with fprintf.

• More informative error codes.  With the new logging facility an effort was made to change generic errors (-1) to more informative ones.  This should aid in the debugging of SSL problems in general and particularly during the SSL handshake.

• More informative logging messages.  As with the above feature, an effort was made to have more descriptive logging messages both in error cases and for informational output.  These should aid debugging and tracking as well.

• EDH on server side.  A wolfSSL server can now do Ephemeral Diffie-Hellman.  No build changes are needed to add this feature.  Though an application will have to register the ephemeral group parameters on the server side to enable the EDH cipher suites.  A new API can be used to do this:

int wolfSSL_SetTmpDH(SSL* ssl, unsigned char* p,int pSz,unsigned char* g,int gSz);

The example server and echoserver use this function from SetDH().

• More robust server downgrade.  Both wolfSSL clients and servers now have robust version downgrade capability.  If a specific version method is used on either side then only that version will be negotiated or an error will be returned.  A client that uses TLSv1 and tries to connect to a SSLv3 only server will fail, likewise connecting to a TLSv1.1 will fail as well.  On the other hand, a client that uses SSLv23 (use the highest version supported and downgrade to SSLv3 if needed) will connect to a server running SSLv3 – TLSv1.2.  The only version it can`t connect to is SSLv2 which has been insecure for years.  Similarly, a server using SSLv23 can handle clients from SSLv3 – TLSv1.2.  A wolfSSL server can`t accept a connection from SSLv2 because no security is provided.

Please email us at or with any questions regarding the above feature additions, the wolfSSL embedded SSL library, or embedded SSL in general.

wolfSSL is Being Ported to OpenRTOS

We wanted to let our followers know that we`re in the process of porting wolfSSL to FreeRTOS/OpenRTOS. FreeRTOS is a real-time operating system for embedded devices which is designed to be small and simple. Currently, it officially supports 27 architectures and is downloaded over 77 thousand times every year.

Like wolfSSL, FreeRTOS is portable, open source and royalty free. OpenRTOS has an identical code base to FreeRTOS except it offers a commercial license for those projects which would rather not abide by the terms of the GPL.

For a full list of features in FreeRTOS/OpenRTOS, and to learn more about the project in general, visit the FreeRTOS website at

If you would like to use wolfSSL with FreeRTOS, or have any questions about our port, please let us know at


wolfSSL and the KLone Web Application Framework

We want to announce that the wolfSSL embedded SSL library has been ported to the popular KLone Web Application Framework and is now available as a build option in KLone 2.4.0!

KLone is a multi-platform web application development framework which is targeted specifically for embedded systems and appliances.  It not only includes a full-featured web server, but also an SDK for creating websites with both static and dynamic content.  KLone combines the web server application (HTTP, HTTPS) together with content and configuration into one single executable file.  Because it`s optimized to run in embedded environments, it maintains a small application footprint and offers fast execution speeds.

We think that KLone and wolfSSL fit together very well.  Both are optimized for embedded environments, are dual licensed under the GPLv2 and commercial licensing, are royalty free, and have awesome development teams behind them.  Initial tests with KLone and wolfSSL resulted in a 20X disk/flash footprint decrease and a 3X performance gain over the comparable OpenSSL+libcrypto combo.

To build KLone with wolfSSL, follow the instructions provided with the KLone download located in the README.wolfSSL file, or download the KLone “Crypto” example application and follow the included instructions.  More information can be found at the following links:

KLone Crypto Examples:

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