OpenSSL is a library available for multiple systems. It has been available since 1998. It is widely used in the area of cryptography. It is an open-source, commercial-grade application that enables its users to install the SSL certificate and complete the SSL tasks with ease. It helps with Certificate Signing Requests (CSR) and also provides the facility to convert the certificate into different SSL formats and perform verifications.

OpenSSL comes with a toolkit with a rich set of features for the purposes of Transport Layer Security (TLS) and Secure Sockets Layer (SSL). It is actively run and maintained by the OpenSSL Management Committee.

mod_ssl is a module available only for the Apache HTTP server. It is considered optional for use. It is known for placing a strong emphasis on cryptography. It focuses on the Secure Sockets Layer and Transport Layer Security protocols. It is fully open source. It is suitable for both commercial and non-commercial purposes. It can be used on Unix and Win32 platforms.

Mod_ssl is known for its high-performance SSL engine logging facility. It also provides ease of integration by way of Extended API. It provides full dynamic shared object (DSO) support as well. It is known for its well-developed Apache module architecture and for its clean source code.

Comparison OpenSSL vs mod ssl