1.\" $OpenBSD: SSL_CTX_set_keylog_callback.3,v 1.2 2021/10/23 13:17:03 schwarze Exp $ 2.\" OpenSSL pod checked up to: 61f805c1 Jan 16 01:01:46 2018 +0800 3.\" 4.\" Copyright (c) 2021 Bob Beck <beck@openbsd.org> 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd $Mdocdate: October 23 2021 $ 19.Dt SSL_CTX_SET_KEYLOG_CALLBACK 3 20.Os 21.Sh NAME 22.Nm SSL_CTX_set_keylog_callback , 23.Nm SSL_CTX_get_keylog_callback 24.Nd set and get the unused key logging callback 25.Sh SYNOPSIS 26.In openssl/ssl.h 27.Ft typedef void 28.Fo (*SSL_CTX_keylog_cb_func) 29.Fa "const SSL *ssl" 30.Fa "const char *line" 31.Fc 32.Ft void 33.Fn SSL_CTX_set_keylog_callback "SSL_CTX *ctx" "SSL_CTX_keylog_cb_func cb" 34.Ft SSL_CTX_keylog_cb_func 35.Fn SSL_CTX_get_keylog_callback "const SSL_CTX *ctx" 36.Sh DESCRIPTION 37.Fn SSL_CTX_set_keylog_callback 38sets the TLS key logging callback. 39This callback is never called in LibreSSL. 40.Pp 41.Fn SSL_CTX_set_keylog_callback 42retrieves the previously set TLS key logging callback. 43.Pp 44These functions are provided only for compatibility with OpenSSL. 45.Sh RETURN VALUES 46.Fn SSL_CTX_get_keylog_callback 47returns the previously set TLS key logging callback, or 48.Dv NULL 49if no callback has been set. 50.Sh SEE ALSO 51.Xr ssl 3 , 52.Xr SSL_CTX_new 3 53.Sh HISTORY 54These function first appeared in OpenSSL 1.1.1 55and have been available since 56.Ox 7.1 . 57