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OpenSSL is a software library for applications that provide secure communications over computer networks against eavesdropping, and identify the party at the other end. It is widely used by Internet servers, including the majority of HTTPS websites. OpenSSL contains an open-source implementation of the SSL and TLS protocols.
LibreSSL is an open-source implementation of the Transport Layer Security (TLS) protocol. The implementation is named after Secure Sockets Layer (SSL), the deprecated predecessor of TLS, for which support was removed in release 2.3.0.
OpenSSL was available at the time, and was dual licensed under the OpenSSL License and the SSLeay license. [7] yaSSL, alternatively, was developed and dual-licensed under both a commercial license and the GPL. [8] yaSSL offered a more modern API, commercial style developer support and was complete with an OpenSSL compatibility layer. [4]
Several versions of the TLS protocol exist. SSL 2.0 is a deprecated [27] protocol version with significant weaknesses. SSL 3.0 (1996) and TLS 1.0 (1999) are successors with two weaknesses in CBC-padding that were explained in 2001 by Serge Vaudenay. [28]
SSLeay is an open-source SSL implementation. It was developed by Eric Andrew Young [1] and Tim J. Hudson as an SSL 3.0 implementation using RC2 and RC4 encryption. [2] The recommended pronunciation is to say each letter s-s-l-e-a-y and was first developed by Eric A. Young ("eay"). [3]
This table denotes, if a cryptography library provides the technical requisites for FIPS 140, and the status of their FIPS 140 certification (according to NIST's CMVP search, [27] modules in process list [28] and implementation under test list).
The core SSL library is written in the C programming language and implements the SSL module, the basic cryptographic functions and provides various utility functions. Unlike OpenSSL and other implementations of TLS, Mbed TLS is like wolfSSL in that it is designed to fit on small embedded devices, with the minimum complete TLS stack requiring under 60KB of program space and under 64 KB of RAM.
In 2004, a patch for adding TLS/SNI into OpenSSL was created by the EdelKey project. [37] In 2006, this patch was then ported to the development branch of OpenSSL, and in 2007 it was back-ported to OpenSSL 0.9.8 (first released in 0.9.8f [38]). First web browsers with SNI support appeared in 2006 (Mozilla Firefox 2.0, Internet Explorer 7), web ...