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/* $OpenBSD: ssl_tlsext.h,v 1.33 2023/04/23 18:51:53 tb Exp $ */
/*
* Copyright (c) 2016, 2017 Joel Sing <jsing@openbsd.org>
* Copyright (c) 2017 Doug Hogan <doug@openbsd.org>
* Copyright (c) 2019 Bob Beck <beck@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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef HEADER_SSL_TLSEXT_H
#define HEADER_SSL_TLSEXT_H
/* TLSv1.3 - RFC 8446 Section 4.2. */
#define SSL_TLSEXT_MSG_CH 0x0001 /* ClientHello */
#define SSL_TLSEXT_MSG_SH 0x0002 /* ServerHello */
#define SSL_TLSEXT_MSG_EE 0x0004 /* EncryptedExtension */
#define SSL_TLSEXT_MSG_CT 0x0008 /* Certificate */
#define SSL_TLSEXT_MSG_CR 0x0010 /* CertificateRequest */
#define SSL_TLSEXT_MSG_NST 0x0020 /* NewSessionTicket */
#define SSL_TLSEXT_MSG_HRR 0x0040 /* HelloRetryRequest */
__BEGIN_HIDDEN_DECLS
int tlsext_alpn_check_format(CBS *cbs);
int tlsext_sni_is_valid_hostname(CBS *cbs, int *is_ip);
int tlsext_client_build(SSL *s, uint16_t msg_type, CBB *cbb);
int tlsext_client_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert);
int tlsext_server_build(SSL *s, uint16_t msg_type, CBB *cbb);
int tlsext_server_parse(SSL *s, uint16_t msg_type, CBS *cbs, int *alert);
int tlsext_extension_seen(SSL *s, uint16_t);
int tlsext_randomize_build_order(SSL *s);
__END_HIDDEN_DECLS
#endif
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