1 /* $OpenBSD: tls13_record.h,v 1.5 2021/10/23 13:12:14 jsing Exp $ */ 2 /* 3 * Copyright (c) 2019 Joel Sing <jsing@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef HEADER_TLS13_RECORD_H 19 #define HEADER_TLS13_RECORD_H 20 21 #include "bytestring.h" 22 23 __BEGIN_HIDDEN_DECLS 24 25 /* 26 * TLSv1.3 Record Protocol - RFC 8446 section 5. 27 * 28 * The maximum plaintext is 2^14, however for inner plaintext an additional 29 * byte is allowed for the content type. A maximum AEAD overhead of 255-bytes 30 * is permitted, along with a 5-byte header, giving a maximum size of 31 * 5 + 2^14 + 1 + 255 = 16,645-bytes. 32 */ 33 #define TLS13_RECORD_HEADER_LEN 5 34 #define TLS13_RECORD_MAX_AEAD_OVERHEAD 255 35 #define TLS13_RECORD_MAX_PLAINTEXT_LEN 16384 36 #define TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN \ 37 (TLS13_RECORD_MAX_PLAINTEXT_LEN + 1) 38 #define TLS13_RECORD_MAX_CIPHERTEXT_LEN \ 39 (TLS13_RECORD_MAX_INNER_PLAINTEXT_LEN + TLS13_RECORD_MAX_AEAD_OVERHEAD) 40 #define TLS13_RECORD_MAX_LEN \ 41 (TLS13_RECORD_HEADER_LEN + TLS13_RECORD_MAX_CIPHERTEXT_LEN) 42 43 /* 44 * TLSv1.3 Per-Record Nonces and Sequence Numbers - RFC 8446 section 5.3. 45 */ 46 #define TLS13_RECORD_SEQ_NUM_LEN 8 47 48 struct tls13_record; 49 50 struct tls13_record *tls13_record_new(void); 51 void tls13_record_free(struct tls13_record *_rec); 52 uint16_t tls13_record_version(struct tls13_record *_rec); 53 uint8_t tls13_record_content_type(struct tls13_record *_rec); 54 int tls13_record_header(struct tls13_record *_rec, CBS *_cbs); 55 int tls13_record_content(struct tls13_record *_rec, CBS *_cbs); 56 void tls13_record_data(struct tls13_record *_rec, CBS *_cbs); 57 int tls13_record_set_data(struct tls13_record *_rec, uint8_t *_data, 58 size_t _data_len); 59 ssize_t tls13_record_recv(struct tls13_record *_rec, tls_read_cb _wire_read, 60 void *_wire_arg); 61 ssize_t tls13_record_send(struct tls13_record *_rec, tls_write_cb _wire_write, 62 void *_wire_arg); 63 64 __END_HIDDEN_DECLS 65 66 #endif 67