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/* $OpenBSD: tls13_record.h,v 1.5 2021/10/23 13:12:14 jsing Exp $ */
/*
* Copyright (c) 2019 Joel Sing <jsing@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_TLS13_RECORD_H
#define HEADER_TLS13_RECORD_H
#include "bytestring.h"
__BEGIN_HIDDEN_DECLS
/*
* TLSv1.3 Record Protocol - RFC 8446 section 5.
*
* The maximum plaintext is 2^14, however for inner plaintext an additional
* byte is allowed for the content type. A maximum AEAD overhead of 255-bytes
* is permitted, along with a 5-byte header, giving a maximum size of
* 5 + 2^14 + 1 + 255 = 16,645-bytes.
*/
#define TLS13_RECORD_HEADER_LEN 5
#define TLS13_RECORD_MAX_AEAD_OVERHEAD 255
#define TLS13_RECORD_MAX_PLAINTEXT_LEN 16384
#define TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN \
(TLS13_RECORD_MAX_PLAINTEXT_LEN + 1)
#define TLS13_RECORD_MAX_CIPHERTEXT_LEN \
(TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN + TLS13_RECORD_MAX_AEAD_OVERHEAD)
#define TLS13_RECORD_MAX_LEN \
(TLS13_RECORD_HEADER_LEN + TLS13_RECORD_MAX_CIPHERTEXT_LEN)
/*
* TLSv1.3 Per-Record Nonces and Sequence Numbers - RFC 8446 section 5.3.
*/
#define TLS13_RECORD_SEQ_NUM_LEN 8
struct tls13_record;
struct tls13_record *tls13_record_new(void);
void tls13_record_free(struct tls13_record *_rec);
uint16_t tls13_record_version(struct tls13_record *_rec);
uint8_t tls13_record_content_type(struct tls13_record *_rec);
int tls13_record_header(struct tls13_record *_rec, CBS *_cbs);
int tls13_record_content(struct tls13_record *_rec, CBS *_cbs);
void tls13_record_data(struct tls13_record *_rec, CBS *_cbs);
int tls13_record_set_data(struct tls13_record *_rec, uint8_t *_data,
size_t _data_len);
ssize_t tls13_record_recv(struct tls13_record *_rec, tls_read_cb _wire_read,
void *_wire_arg);
ssize_t tls13_record_send(struct tls13_record *_rec, tls_write_cb _wire_write,
void *_wire_arg);
__END_HIDDEN_DECLS
#endif
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