.\" $OpenBSD: tls_config_set_session_id.3,v 1.3 2017/01/28 00:59:36 schwarze Exp $
.\"
.\" Copyright (c) 2017 Claudio Jeker <claudio@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\"
.Dd $Mdocdate: January 28 2017 $
.Dt TLS_CONFIG_SET_SESSION_ID 3
.Os
.Sh NAME
.Nm tls_config_set_session_id ,
.Nm tls_config_set_session_lifetime ,
.Nm tls_config_add_ticket_key
.Nd configure resuming of TLS handshakes
.Sh SYNOPSIS
.In tls.h
.Ft int
.Fo tls_config_set_session_id
.Fa "struct tls_config *config"
.Fa "const unsigned char *session_id"
.Fa "size_t len"
.Fc
.Ft int
.Fo tls_config_set_session_lifetime
.Fa "struct tls_config *config"
.Fa "int lifetime"
.Fc
.Ft int
.Fo tls_config_add_ticket_key
.Fa "struct tls_config *config"
.Fa "uint32_t keyrev"
.Fa "unsigned char *key"
.Fa "size_t keylen"
.Fc
.Sh DESCRIPTION
.Fn tls_config_set_session_id
sets the session identifier that will be used by the TLS server when
sessions are enabled.
By default a random value is used.
.Pp
.Fn tls_config_set_session_lifetime
sets the lifetime to be used for TLS sessions.
Session support is disabled if a lifetime of zero is specified, which is the
default.
.Pp
.Fn tls_config_add_ticket_key
adds a key used for the encryption and authentication of TLS tickets.
By default keys are generated and rotated automatically based on their lifetime.
This function should only be used to synchronise ticket encryption key across
multiple processes.
Re-adding a known key will result in an error, unless it is the most recently
added key.
.Sh RETURN VALUES
These functions return 0 on success or -1 on error.
.Sh SEE ALSO
.Xr tls_accept_socket 3 ,
.Xr tls_config_set_protocols 3 ,
.Xr tls_init 3 ,
.Xr tls_load_file 3 ,
.Xr tls_server 3
.Sh HISTORY
These functions appeared in
.Ox 6.1 .
.Sh AUTHORS
.An Claudio Jeker Aq Mt claudio@openbsd.org