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.\" ========================================================================
.\"
.IX Title "SSL_CTX_SET_KEYLOG_CALLBACK 3"
.TH SSL_CTX_SET_KEYLOG_CALLBACK 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.nh
.SH "NAME"
SSL_CTX_set_keylog_callback, SSL_CTX_get_keylog_callback, SSL_CTX_keylog_cb_func \- logging TLS key material
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_CTX_set_keylog_callback()\fR sets the \s-1TLS\s0 key logging callback. This callback
is called whenever \s-1TLS\s0 key material is generated or received, in order to allow
applications to store this keying material for debugging purposes.
.PP
\&\fISSL_CTX_get_keylog_callback()\fR retrieves the previously set \s-1TLS\s0 key logging
callback. If no callback has been set, this will return \s-1NULL.\s0 When there is no
key logging callback, or if SSL_CTX_set_keylog_callback is called with \s-1NULL\s0 as
the value of cb, no logging of key material will be done.
.PP
The key logging callback is called with two items: the \fBssl\fR object associated
with the connection, and \fBline\fR, a string containing the key material in the
format used by \s-1NSS\s0 for its \fB\s-1SSLKEYLOGFILE\s0\fR debugging output. To recreate that
file, the key logging callback should log \fBline\fR, followed by a newline.
\&\fBline\fR will always be a NULL-terminated string.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISSL_CTX_get_keylog_callback()\fR returns a pointer to \fBSSL_CTX_keylog_cb_func\fR or
\&\s-1NULL\s0 if the callback is not set.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIssl\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.