2022-04-24 16:29:35 -04:00
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/* $OpenBSD: tls13_record.h,v 1.5 2021/10/23 13:12:14 jsing Exp $ */
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2020-12-28 10:15:37 -05:00
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/*
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* Copyright (c) 2019 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef HEADER_TLS13_RECORD_H
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#define HEADER_TLS13_RECORD_H
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#include "bytestring.h"
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__BEGIN_HIDDEN_DECLS
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/*
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* TLSv1.3 Record Protocol - RFC 8446 section 5.
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*
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* The maximum plaintext is 2^14, however for inner plaintext an additional
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* byte is allowed for the content type. A maximum AEAD overhead of 255-bytes
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* is permitted, along with a 5-byte header, giving a maximum size of
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* 5 + 2^14 + 1 + 255 = 16,645-bytes.
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*/
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#define TLS13_RECORD_HEADER_LEN 5
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#define TLS13_RECORD_MAX_AEAD_OVERHEAD 255
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#define TLS13_RECORD_MAX_PLAINTEXT_LEN 16384
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#define TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN \
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(TLS13_RECORD_MAX_PLAINTEXT_LEN + 1)
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#define TLS13_RECORD_MAX_CIPHERTEXT_LEN \
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(TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN + TLS13_RECORD_MAX_AEAD_OVERHEAD)
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#define TLS13_RECORD_MAX_LEN \
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(TLS13_RECORD_HEADER_LEN + TLS13_RECORD_MAX_CIPHERTEXT_LEN)
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/*
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* TLSv1.3 Per-Record Nonces and Sequence Numbers - RFC 8446 section 5.3.
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*/
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#define TLS13_RECORD_SEQ_NUM_LEN 8
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struct tls13_record;
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struct tls13_record *tls13_record_new(void);
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void tls13_record_free(struct tls13_record *_rec);
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uint16_t tls13_record_version(struct tls13_record *_rec);
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uint8_t tls13_record_content_type(struct tls13_record *_rec);
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int tls13_record_header(struct tls13_record *_rec, CBS *_cbs);
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int tls13_record_content(struct tls13_record *_rec, CBS *_cbs);
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void tls13_record_data(struct tls13_record *_rec, CBS *_cbs);
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int tls13_record_set_data(struct tls13_record *_rec, uint8_t *_data,
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size_t _data_len);
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ssize_t tls13_record_recv(struct tls13_record *_rec, tls_read_cb _wire_read,
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void *_wire_arg);
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ssize_t tls13_record_send(struct tls13_record *_rec, tls_write_cb _wire_write,
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void *_wire_arg);
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__END_HIDDEN_DECLS
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#endif
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