SSL_LIBRARY_INIT(3ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💖 SSL_LIBRARY_INIT 💖

okay so bestie, welcome to the SSL_LIBRARY_INIT(3ossl) page of the OpenSSL manual 🌸 — yes that's the manual name, we're in OpenSSL land, buckle up 🎀

✨ NAME ✨

SSL_library_init, OpenSSL_add_ssl_algorithms — these two are the original "light it up" functions: they initialize the SSL library by registering algorithms 💅

🦋 SYNOPSIS 🦋

#include <openssl/ssl.h>

int SSL_library_init(void);

int OpenSSL_add_ssl_algorithms(void);

that's it, that's the whole vibe check 🔥

🌈 DESCRIPTION 🌈

SSL_library_init() registers the available SSL/TLS ciphers and digests. that's the whole personality, no cap ✨

OpenSSL_add_ssl_algorithms() is a synonym for SSL_library_init() and is implemented as a macro — so like, same energy, different name, iykyk 🫶

👑 NOTES 👑

  • SSL_library_init() must be called before any other action takes place. like bestie, before anything else, it's giving main character energy and honestly it deserves it 💀
  • SSL_library_init() is not reentrant. do not try to run it from multiple threads at once, that's not the move 🙈

💀 WARNINGS 💀

SSL_library_init() adds ciphers and digests used directly and indirectly by SSL/TLS — so the stuff you call and the stuff that gets called behind your back, all of it, bestie 🍓

🎀 RETURN VALUES 🎀

SSL_library_init() always returns "1" — literally always, it's that consistent king 👑 — so it is safe to discard the return value. no need to check it, fr fr 💖

⭐ SEE ALSO ⭐

go read those next, they're iconic too 🦋

🧚 HISTORY 🧚

the SSL_library_init() and OpenSSL_add_ssl_algorithms() functions were deprecated in OpenSSL 1.1.0 by OPENSSL_init_ssl(). so like... they're still here, but they're old news, ngl 😭

Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 🫶

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html> 🌸

bestie reminder: this page ships with 3.5.0, dated 2026-09-25 — that's the source/version and the date, so you know exactly which manual you're reading 💜 love that for you, mwah 💅✨
📦 where this page comes from