wolfCrypt and wolfSSL Separation

Up to now, wolfCrypt cryptography library users have had to use it as a part of wolfSSL.  We are now embarking on the project to separate the two, and when finished should have a separate wolfCrypt download for our users that only need to use our crypto.  Our goals are to make the separate downloads easy to maintain and easy to set up.  If you are a wolfCrypt user, and have concerns or comments on how we do this, then please contact us at facts@wolfssl.com.

Using Server Name Indication (SNI) with wolfSSL

Have you ever wondered how to use SNI with the wolfSSL embedded SSL library? SNI is useful when a server hosts multiple
‘virtual’ servers at a single underlying network address. It may be desirable for clients to provide the name of the server which it is contacting. To enable SNI with wolfSSL you can simply do:

./configure –enable-sni

Using SNI on the client side requires an additional function call, which should be one of the following functions:


wolfSSL_CTX_UseSNI() is most recommended when the client contacts the same server multiple times. Setting the SNI extension at the context level will enable the SNI usage in all SSL objects created from that same context from the moment of the call forward.

wolfSSL_UseSNI() will enable SNI usage for one SSL object only, so it is recommended to use this function when the server name changes between sessions.

On the server side one of the same function calls is required. Since the wolfSSL server doesn`t host multiple `virtual` servers, the SNI usage is useful when the termination of the connection is desired in the case of SNI mismatch. In this scenario, wolfSSL_CTX_UseSNI() will be more efficient, as the server will set it only once per context creating all subsequent SSL objects with SNI from that same context.

If you have any questions about using SNI with TLS please let us know at facts@wolfssl.com.

wolfSSL Support for Microchip TCP/IP Version 6

Are you interested in using the wolfSSL lightweight SSL/TLS library with version 6 of the Microchip TCP/IP stack? If so, you’re in luck! We recently added support for version 6 to wolfSSL. Now wolfSSL supports running on top of either version 5 or version 6 of the stack.

We have updated not only our library source code, but also our example PIC32 SSL client and server. You can find more details on our PIC32-specific webpage, here: http://yassl.com/yaSSL/cyassl-pic32.html.

To download the latest version of wolfSSL with support for Microchip TCP/IP version 6, please see our GitHub repository (https://github.com/cyassl/cyassl). Support will also roll into our next stable release of wolfSSL in June.

wolfSSL Product Page: http://yassl.com/yaSSL/Products-cyassl.html
Microchip TCP/IP Stack: https://www.microchip.com/SWLibraryWeb/product.aspx?product=TCPIPSTACK

wolfSSL Embedded SSL for Bare Metal and No OS Environments

Are you looking for an SSL/TLS library which will seamlessly integrate into your bare metal or No-OS environment? If so, continue reading to learn why the wolfSSL lightweight SSL library is a perfect fit for such environments.

wolfSSL has been designed with portability and ease of use in mind, allowing developers to easily integrate it into a bare metal or operating systemless environment. As a large percentage of wolfSSL users are running the library on small, embedded devices, we have added several abstraction layers which make tying wolfSSL into these types of environments an easy task.

Available abstraction layers include:
+ Custom Input/Output
+ Standard C library / Memory
+ File system (Able to use cert/key buffers instead)
+ Threading
+ Operating System

In addition to abstraction layers, we have tried to keep wolfSSL’s memory usage as low as possible. Build sizes for a complete SSL/TLS stack range from 20-100kB depending on build options, with RAM usage between 1-36kB per connection.

To learn more about how to integrate wolfSSL into your environment or get more information about reducing wolfSSL’s memory usage, please see the wolfSSL Manual or contact us directly.

SSL Through and Through

At wolfSSL we`ve been focusing on SSL/TLS/DTLS technology for 9 years.  We believe that`s important, and if you`re looking for an SSL provider for licenses, support, or custom consulting that may be important to you as well.  Some of our competitors have gone out of business, been sold to larger companies focused on other technologies, or have started on new technologies themselves.  For us, having a day to day primary interest in SSL is beneficial in providing a highly portable, lightweight, fast, up to date, scaleable, full featured solution.  If you`re looking at SSL solutions, we`d love to hear what`s important to you in a provider; we believe our focus on SSL will prove to be a good match for your requirements.

wolfSSL adds support for ARM`s Keil MDK-ARM and RTX

In an effort to ensure that the wolfSSL lightweight SSL library operates seamlessly with the Keil tools, we have recently added MDK-ARM 4 project files to our package.  Additionally, we have added support for Keil RTX.  Information on MDK-ARM 4 can be found here:  http://www.keil.com/arm/mdk.asp.  Information on RTX can be found here: http://www.keil.com/arm/rl-arm/kernel.asp.  Support is currently in beta.  Let us know if you would like to check it out by contacting us at facts@wolfssl.com.

We will also be adding support for Keil MDK-ARM 5, when it comes out of beta.