LIBRESSL-SSL_SESSION_IS_RESUMABLE(3)

💖 SSL_SESSION_IS_RESUMABLE(3) 💖

okay bestie, welcome to the LibreSSL manual page for SSL_SESSION_is_resumable — section 3, Library Functions Manual, the whole vibe. This is your go-to for checking whether an SSL_SESSION object can be used for resumption. Slay. ✨

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🌸 NAME 🌸

SSL_SESSION_is_resumable — determine whether an SSL_SESSION object can be used for resumption. That’s the mission, that’s the moment. 💅

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✨ SYNOPSIS ✨

okay so you’re pulling in the library situation and the header, and the function looks like this:

library “libssl” libcrypto
#include <openssl/ssl.h>

int
SSL_SESSION_is_resumable(const SSL_SESSION *session);

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🦋 DESCRIPTION 🦋

SSL_SESSION_is_resumable() determines whether the session object can be used to resume a session. That’s literally the function’s whole personality. 🫶

Note that attempting to resume with a non-resumable session will result in a full handshake. So yeah — if the session is not resumable, you’re getting the full-handshake experience instead of the cute little resume moment. 😭

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🎀 RETURN VALUES 🎀

• 1 — the session is resumable ✨
• 0 — otherwise

and with LibreSSL, it always returns 0. Not me getting a permanent zero, but okay. 💀

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🌈 SEE ALSO 🌈

• ssl(3)
• SSL_CTX_sess_set_new_cb(3)
• SSL_get_session(3)

go read those too, bestie — the lore is connected. 👑

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⭐ HISTORY ⭐

SSL_SESSION_is_resumable() first appeared in OpenSSL 1.1.1 and has been available since OpenBSD 7.0. iconic little timeline moment. 🦋

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Debian · June 8, 2025 · SSL_SESSION_IS_RESUMABLE(3) — brought to you with section-3 main character energy, mwah 💋🎀