LIBRESSL-SSL_CTX_SET_KEYLOG_CALLBACK(3)

🎀 SSL_CTX_SET_KEYLOG_CALLB(3) 🎀

okay bestie so this one's from the Library Functions Manual and honestly? it's a little bit of a comedy bit. strap in 💅

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✨ NAME ✨

SSL_CTX_set_keylog_callback, SSL_CTX_get_keylog_callback — they set and get the TLS key logging callback 🎀 …which, and I cannot stress this enough, is unused. like, the callback exists, the setter exists, the getter exists, and the callback never gets called. it's giving decorative. it's giving aesthetic. 🔥

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🌸 SYNOPSIS 🌸

library “libssl” libcrypto

#include <openssl/ssl.h>

typedef void
(*SSL_CTX_keylog_cb_func)(const SSL *ssl, const char *line);

void
SSL_CTX_set_keylog_callback(SSL_CTX *ctx, SSL_CTX_keylog_cb_func cb);

SSL_CTX_keylog_cb_func
SSL_CTX_get_keylog_callback(const SSL_CTX *ctx);

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🦋 DESCRIPTION 🦋

so SSL_CTX_set_keylog_callback() sets the TLS key logging callback. and then — plot twist — this callback is never called in LibreSSL 😭 that's the whole vibe. you set it, it sits there, it's a callback that never rings. main character energy but the show got cancelled.

SSL_CTX_get_keylog_callback() retrieves the previously set TLS key logging callback. so like, at least you can look at it. retrieval is real, execution is not 💀

both of these functions are provided only for compatibility with OpenSSL. that's it, that's the whole reason they exist, no cap 🫶

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💖 RETURN VALUES 💖

SSL_CTX_get_keylog_callback() returns the previously set TLS key logging callback, or NULL if no callback has been set. lowkey the most action this page gets ✨

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🌈 SEE ALSO 🌈

• ssl(3)
• SSL_CTX_new(3)

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👑 HISTORY 👑

these functions first appeared in OpenSSL 1.1.1 and have been available since OpenBSD 7.1. iconic lineage honestly 🧚

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ngl bestie, this is the manpage equivalent of a callback that never gets called back 💀 set it, get it, but don't expect a text back.

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mwah 💋 this lil page is from Debian, dated September 1, 2026, and lives under SSL_CTX_SET_KEYLOG_CALLBACK(3) — or SSL_CTX_SET_KEYLOG_CALLB(3) if you go by the top of the page, which, yes, is a whole different spelling, and no, we're not going to talk about it 😭💅