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Title: CyaSSL  
Author: World Heritage Encyclopedia
Language: English
Subject: Transport Layer Security, CURL, GnuTLS, Cryptlib, AES instruction set
Publisher: World Heritage Encyclopedia


Developer(s) Todd Ouska
Initial release February 19, 2006 (2006-02-19)[1]
Stable release 2.8.0 / August 30, 2013; 10 months ago (2013-08-30)[1]
Development status Active
Written in C language
Operating system Multi-platform
Type Security library
License GNU General Public License or Commercial Distribution License

CyaSSL (or yet another SSL) is a small, portable, embedded SSL programming library targeted for use by embedded systems developers. It is an open source implementation of SSL (SSL 3, TLS 1.0, 1.1, 1.2, and DTLS 1.0 and 1.2) built in the C language. It includes SSL client libraries and an SSL server implementation as well as support for multiple API's, including those defined by SSL and TLS. CyaSSL also includes an OpenSSL compatibility interface with the most commonly used OpenSSL functions.[2]


CyaSSL is currently available for Win32/64, Linux, Mac OS X, Solaris, FreeBSD, NetBSD, OpenBSD, embedded linux, Haiku, OpenWrt, iPhone, Android, Nintendo Wii and Gamecube through DevKitPro support, QNX, VxWorks, MontaVista, ThreadX, Tron variants, NonStop, OpenCL, Micrium's MicroC/OS-II, FreeRTOS, Freescale MQX, Nucleus, and TinyOS.


The first major user of CyaSSL/yaSSL was MySQL.[3] Through bundling with MySQL, yaSSL has achieved extremely high distribution volumes in the millions.

Today CyaSSL is used in both open source and commercial projects.[4] CyaSSL is included in many types of network devices such as smart devices on automobiles, IP phones, mobile phones, routers, printers, and credit card scanners.


The CyaSSL lightweight SSL library implements the following protocols:[5]

  • SSL 3.0, TLS 1.0, TLS 1.1, TLS 1.2
  • DTLS 1.0, DTLS 1.2

CyaSSL does not support SSL 2.0 as it is insecure.


CyaSSL uses the following cryptography libraries:


By default, CyaSSL uses the cryptographic services provided by wolfCrypt.[6] CTaoCrypt strives to be more portable while only providing the functionality necessary for SSL type needs. CTaoCrypt Provides RSA, DSS, Diffie–Hellman, EDH, NTRU, DES, Triple DES, AES (CBC, CTR, CCM, GCM), Camellia, ARC4, HC-128, MD2, MD4, MD5, SHA-1, SHA-2, BLAKE2, RIPEMD-160, Random Number Generation, Large Integer support, and base 16/64 encoding/decoding. An experimental cipher called Rabbit, a public domain stream cipher from the EU's eSTREAM project, is also included. Rabbit is potentially useful to those encrypting streaming media in high performance, high demand environments.

CTaoCrypt acts as a back-end crypto implementation for several popular software packages and libraries, including MIT Kerberos[7] (where it can be enabled using a build option).


CyaSSL+ includes NTRU[8] public key encryption. The addition of NTRU in CyaSSL+ was a result of the partnership between yaSSL and Security Innovations.[8] NTRU works well in mobile and embedded environments due to the reduced bit size needed to provide the same security as other public key systems. In addition, it's not vulnerable to quantum attacks. Several cipher suites utilizing NTRU are available with CyaSSL+ including AES-256, RC4, and HC-128.

Product history

Milestones in CyaSSL development include:

  • CyaSSL version 2.3.0 was released on August 10, 2012
  • CyaSSL version 2.2.0 was released on May 18, 2012
  • CyaSSL version 2.0.8 was released on February 24, 2012
  • CyaSSL version 2.0.0rc3 was released on September 28, 2011
  • CyaSSL version 1.9.0 was released on March 2, 2011
  • CyaSSL version 1.6.0 was released on August 27, 2010.
  • CyaSSL version 1.5.0 was released on May 11, 2010.
  • CyaSSL version 1.2.0 was released on November 2, 2009.
  • CyaSSL version 1.1.0 was released on September 2, 2009.
  • CyaSSL version 1.0.2 was released on April 2, 2009.
  • CyaSSL version rc3-1.0.0 was released on February 25, 2009.
  • CyaSSL version rc1-1.0.0 was released on December 17, 2008.


CyaSSL is Open Source, licensed under the GNU General Public License GPLv2.[9]


2011 Tomorrow's Technology Today - Mobile Encryption[10]

See also

Free software portal
Cryptography portal


External links

  • wolfSSL/CyaSSL Homepage
  • CyaSSL/wolfSSL Documentation
  • Free TLS Implementation Comparison
  • CyaSSL - High-Performance SSL, Security Innovation
  • wolfSSL Secures Embedded Systems with Tiny Footprints

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