1.\" $OpenBSD: SSL_CTX_set_keylog_callback.3,v 1.1 2021/10/23 11:41:52 beck Exp $ 2.\" Copyright (c) 2021, Bob Beck <beck@openbsd.org> 3.\" 4.\" Permission to use, copy, modify, and distribute this software for any 5.\" purpose with or without fee is hereby granted, provided that the above 6.\" copyright notice and this permission notice appear in all copies. 7.\" 8.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15.\" 16.Dd $Mdocdate: October 23 2021 $ 17.Dt SSL_CTX_SET_KEYLOG_CALLBACK 3 18.Os 19.Sh NAME 20.Nm SSL_CTX_set_keylog_callback , 21.Nm SSL_CTX_get_keylog_callback 22.Nd set and get the unused key logging callback 23.Sh SYNOPSIS 24.In openssl/ssl.h 25.Bd -literal 26typedef void (*SSL_CTX_keylog_cb_func)(const SSL *ssl, const char *line) 27.Ed 28.Ft void 29.Fn SSL_CTX_set_keylog_callback "SSL_CTX *ctx" "SSL_CTX_keylog_cb_func cb" 30.Ft SSL_CTX_keylog_cb_func 31.Fn SSL_CTX_get_keylog_callback "const SSL_CTX *ctx" 32.Sh DESCRIPTION 33.Fn SSL_CTX_set_keylog_callback 34sets the TLS key logging callback. 35This callback is never called in LibreSSL. 36.Pp 37.Fn SSL_CTX_set_keylog_callback 38retrieves the previously set TLS key logging callback. 39.Pp 40These functions are provided only for compatibility with OpenSSL. 41.Sh RETURN VALUES 42.Fn SSL_CTX_get_keylog_callback 43returns the previously set TLS key logging callback, or NULL 44if no callback has been set. 45