SSL_GET_EXTMS_SUPPORT(3ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💖 SSL_GET_EXTMS_SUPPORT — extended master secret support 💖

okay so bestie, this is SSL_get_extms_support, and it's one of those tiny OpenSSL man pages from the 3ossl fam that does exactly one thing but does it so well. no notes. 🫶

🌸 SYNOPSIS 🌸

like, the whole vibe right here:

#include <openssl/ssl.h>

int SSL_get_extms_support(SSL *ssl);

that's it. that's the function. iconic behavior honestly. ✨

🦋 DESCRIPTION 🦋

okay so SSL_get_extms_support() tells you whether the current session used extended master secret. that's the whole tea. ☕ no cap.

lowkey important detail tho: this function is implemented as a macro. so it's not a "real" function you can take a pointer to or whatever — it's a macro, periodt. 💅

🎀 RETURN VALUES 🎀

the return value check is literally the main character here, so pay attention bestie 👑

  • 1 — yes bestie, the current session used extended master secret. slay. 🌈
  • 0 — nope, it did not. 🍓
  • -1 — a handshake is currently in progress, which means it's not possible to determine if extended master secret was used. like, the vibe check isn't finished yet 😭 give it a sec.
fr fr, that -1 is not an error in the "something broke" sense — it's just "handshake still happening, ask me later." 🙈

🧚 SEE ALSO 🧚

  • ssl(7) — go read the big one, iykyk 🦋

Copyright 2015-2016 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>. 🔥

and that's the whole page, bestie! this version is from 3.5.0, dated 2026-09-25, and it lives in the SSL_GET_EXTMS_SUPPORT(3ossl) manual. go off, extms queen 💅🎀⭐

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