OpenSSL is a framework which implements the secure socket layer. It ships with a program/library which gives you access to all those functions.
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mkcert Alternatives
mkcert is described as 'Using certificates from real certificate authorities (CAs) for development can be dangerous or impossible (for hosts like example.test, localhost or 127.0.0.1), but self-signed certificates cause trust errors' and is an app. There are 1 alternatives to mkcert for Mac, Windows, Linux, BSD and Haiku. The best mkcert alternative is OpenSSL, which is both free and Open Source.
Alternatives list
10 OpenSSL alternatives
