OpenSSL

OpenSSL
source
Name	OpenSSL
Developer	OpenSSL Software Foundation
Released	1998
Programming language	C, assembly
Operating system	Cross-platform
Genre	Cryptography, TLS, SSL
License	Apache License 2.0

OpenSSL. It is a robust, open-source toolkit implementing the Secure Sockets Layer and Transport Layer Security protocols, alongside a full-strength general-purpose cryptographic library. The software is developed and maintained by the OpenSSL Software Foundation with contributions from a global community, forming a critical component of internet security infrastructure. It is widely used to secure communications for web servers, email servers, virtual private networks, and countless other applications across diverse operating systems.

Overview

The toolkit provides a comprehensive suite of cryptographic functions and utilities, enabling developers to incorporate strong encryption, digital certificate validation, and secure network communication into their applications. Its core library supports a vast array of symmetric-key algorithms, public-key cryptography, and hash functions, making it a versatile foundation for security software. As a foundational element of the modern internet, it is integrated into major operating systems like Linux, BSD variants, and is utilized by prominent software projects including the Apache HTTP Server and the nginx web server. The project's governance and development are overseen by the OpenSSL Software Foundation, which manages releases and coordinates the efforts of volunteer contributors.

History

The project originated from a merger between two earlier free software projects: SSLeay, developed by Eric A. Young and Timothy J. Hudson, and a separate effort by a group of volunteers. Following the conclusion of SSLeay development in 1998, the merged codebase was adopted to create the initial version. A significant early milestone was its adoption for the implementation of HTTPS in the burgeoning World Wide Web. The project gained immense prominence and scrutiny following the disclosure of the Heartbleed bug in 2014, a severe vulnerability that prompted a major overhaul of its development practices and funding model. This event led to increased financial support from corporations like Google, Microsoft, and the Linux Foundation through initiatives such as the Core Infrastructure Initiative.

Features

Its cryptographic library offers implementations of numerous algorithms including Advanced Encryption Standard, RSA (cryptosystem), and Elliptic-curve cryptography. The toolkit includes command-line utilities for tasks such as generating Certificate signing requests, creating and managing public key certificates, and testing TLS connections. It supports the latest protocol standards defined by the Internet Engineering Task Force, including TLS 1.3, and provides engines for hardware acceleration. Additional features encompass support for OCSP stapling, Session tickets, and a wide range of cipher suites configurable for various security and compatibility requirements.

Security and vulnerabilities

The software's critical role in global infrastructure has made it a high-value target for security researchers and malicious actors alike. Its history includes several significant security flaws, most notably the Heartbleed bug which affected the Transport Layer Security heartbeat extension. Other notable vulnerabilities have included POODLE, related to SSL 3.0 fallback, and DROWN, which exploited support for the obsolete Secure Sockets Layer protocol. In response to these incidents, the development team has instituted more rigorous code review processes, formalized a security policy, and established a dedicated team for handling vulnerability reports. The project now benefits from ongoing security audits funded by supporting organizations.

Usage and implementation

It is the de facto standard for TLS implementation on Unix-like operating systems and is embedded in a multitude of commercial and open-source products. Major web servers like Apache HTTP Server and nginx use it to enable HTTPS, while programming languages such as Python (programming language) and PHP often rely on its bindings for secure socket operations. System administrators use its command-line tools for tasks like generating private keys for Let's Encrypt certificates and verifying chain-of-trust for X.509 certificates. Its Application programming interface allows developers to add cryptographic functionality directly into applications written in C.

Development and community

Development is primarily conducted by a team of volunteers, with key contributions coordinated by the OpenSSL Software Foundation. The project's technical decisions and roadmap are guided by a group of principal developers. Following the Heartbleed crisis, the project received substantial funding from technology giants including IBM, Cisco Systems, and Intel to improve code quality, documentation, and security practices. The source code is hosted on GitHub, where it is managed using Git and where external contributions are submitted via pull requests. The community engages through mailing lists and a public issue tracker to discuss bugs, features, and the implementation of new Internet Engineering Task Force standards.

Category:Cryptographic software Category:Free security software Category:Transport Layer Security Category:Open-source software