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SSL_CTX_get_keylog_callback.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .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" \&\fBSSL_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 \&\fBSSL_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" \&\fBSSL_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" \&\fBssl\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>.
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