yaSSL 2.3.7

This release of yaSSL fixes the potential to process duplicate handshake messages by explicitly marking/checking received handshake messages.

wolfSSL is a lightweight C-language-based SSL/TLS library targeted for embedded, RTOS, or resource-constrained environments primarily because of its small size, speed, and portability.  wolfSSL supports industry standards up to the current TLS 1.2 and DTLS 1.2 levels, is up to 20 times smaller than OpenSSL, offers a simple API, an OpenSSL compatibility layer, OCSP and CRL, and offers several progressive ciphers. wolfSSL is under active development, and should be chosen over yaSSL when possible.

wolfSSL provides lightweight, portable security solutions with a focus on speed and size.  If you are looking for an SSL library or web server offering optimal speeds while keeping the footprint size at a minimum, look no further.  Dual licensed to cater to a diversity of users ranging from the hobbyist to the commercial customer, we are happy to help you in any way we can.  Our products are open source, giving users the freedom to inspect our codebase first hand. For inquiries, questions, or comments, please Contact Us, or call us direct at +1 425 245 8247.

To read about some of the areas that wolfSSL products are being used, please see our Case Studies page. If you unsure which product best fits your needs, please read Choosing the Correct yaSSL Technology or contact us for guidance.

yaSSL is a C++ based SSL library for embedded and RTOS environments targeted at individuals who prefer to use the C++ language.  yaSSL supports industry standards up to TLS 1.1, and also includes an OpenSSL compatibility interface. CyaSSL should be chosen over yaSSL when possible.

SSL / TLS Libraries


wolfSSL 3.4.0

Release 3.4.0 changes CyaSSL to wolfSSL, adds Curve25519, includes updates to AIX, PIC32MZ, TI-RTOS, PowerPC, Xcode, memory optimizations, warnings, and more.

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The wolfCrypt embedded cryptography engine is a lightweight cryptography library targeted for embedded, RTOS, and resource constrained environments primarily because of its small size, speed, and portability.  wolfCrypt supports the most popular algorithms and ciphers as well as progressive ones such as HC-128, RABBIT, NTRU, and SHA-3.  wolfCrypt is stable, production-ready, and backed by an excellent support team.

Crypto Engines

For Java applications that wish to leverage the industry-leading wolfSSL SSL/TLS implementation for secure communication, this JNI wrapper provides an interface to give those applications support for the current SSL/TLS standards up to TLS 1.2 and DTLS 1.2.


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The wolfCrypt software library is under testing at the leading Cryptographic Security Testing (CST) Laboratory. A FIPS 140-2 Level 1 certificate is expected to be issued in 1Q2015. For additional information, visit the wolfCrypt FIPS FAQ or contact fips@wolfssl.com