SSL_GET_EXTMS_SUPPORT(3ossl)

🌸 NAME 🌸

okay so bestie, welcome to the SSL_GET_EXTMS_SUPPORT(3ossl) page — it’s an OpenSSL manual page, and the function in question is SSL_get_extms_support, aka your little check-in for extended master secret support 💅

✨ SYNOPSIS ✨

#include <openssl/ssl.h>

int SSL_get_extms_support(SSL *ssl);

🦋 DESCRIPTION 🦋

SSL_get_extms_support() tells you whether the current session used extended master secret. That’s literally the whole vibe check 🔥

And plot twist: this function is implemented as a macro. yes bestie, macro behavior, we love a tiny implementation detail 🎀

💖 RETURN VALUES 💖

SSL_get_extms_support() gives you one of these three iconic little numbers:

• 1 — the current session used extended master secret ✅
• 0 — it did not 🙈
• -1 — a handshake is currently in progress, i.e. it is not possible to determine if extended master secret was used 😭

so if you get -1, don’t panic, bestie — the handshake just isn’t done yet, and the answer is not possible to determine.

🌈 SEE ALSO 🌈

• ssl(7) — go check it out, iykyk 🫶

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👑 COPYRIGHT 👑

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>.

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mwah 💋 this page is from OpenSSL 3.5.6, dated 2026-04-07 — and that’s the cute little sign-off, bestie 🎀✨