mirror of
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425 lines
16 KiB
C
Executable File
425 lines
16 KiB
C
Executable File
/* $OpenBSD: tls13_internal.h,v 1.86 2020/07/30 16:23:17 tb Exp $ */
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/*
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* Copyright (c) 2018 Bob Beck <beck@openbsd.org>
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* Copyright (c) 2018 Theo Buehler <tb@openbsd.org>
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* Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and/or 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 ANY
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* 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 ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef HEADER_TLS13_INTERNAL_H
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#define HEADER_TLS13_INTERNAL_H
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#include <openssl/evp.h>
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#include <openssl/ssl.h>
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#include "bytestring.h"
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__BEGIN_HIDDEN_DECLS
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#define TLS13_HS_CLIENT 1
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#define TLS13_HS_SERVER 2
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#define TLS13_IO_SUCCESS 1
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#define TLS13_IO_EOF 0
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#define TLS13_IO_FAILURE -1
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#define TLS13_IO_ALERT -2
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#define TLS13_IO_WANT_POLLIN -3
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#define TLS13_IO_WANT_POLLOUT -4
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#define TLS13_IO_WANT_RETRY -5 /* Retry the previous call immediately. */
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#define TLS13_IO_USE_LEGACY -6
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#define TLS13_IO_RECORD_VERSION -7
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#define TLS13_IO_RECORD_OVERFLOW -8
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#define TLS13_ERR_VERIFY_FAILED 16
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#define TLS13_ERR_HRR_FAILED 17
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#define TLS13_ERR_TRAILING_DATA 18
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#define TLS13_ERR_NO_SHARED_CIPHER 19
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#define TLS13_ERR_NO_CERTIFICATE 20
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#define TLS13_ERR_NO_PEER_CERTIFICATE 21
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#define TLS13_ALERT_LEVEL_WARNING 1
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#define TLS13_ALERT_LEVEL_FATAL 2
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#define TLS13_ALERT_CLOSE_NOTIFY 0
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#define TLS13_ALERT_UNEXPECTED_MESSAGE 10
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#define TLS13_ALERT_BAD_RECORD_MAC 20
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#define TLS13_ALERT_RECORD_OVERFLOW 22
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#define TLS13_ALERT_HANDSHAKE_FAILURE 40
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#define TLS13_ALERT_BAD_CERTIFICATE 42
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#define TLS13_ALERT_UNSUPPORTED_CERTIFICATE 43
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#define TLS13_ALERT_CERTIFICATE_REVOKED 44
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#define TLS13_ALERT_CERTIFICATE_EXPIRED 45
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#define TLS13_ALERT_CERTIFICATE_UNKNOWN 46
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#define TLS13_ALERT_ILLEGAL_PARAMETER 47
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#define TLS13_ALERT_UNKNOWN_CA 48
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#define TLS13_ALERT_ACCESS_DENIED 49
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#define TLS13_ALERT_DECODE_ERROR 50
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#define TLS13_ALERT_DECRYPT_ERROR 51
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#define TLS13_ALERT_PROTOCOL_VERSION 70
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#define TLS13_ALERT_INSUFFICIENT_SECURITY 71
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#define TLS13_ALERT_INTERNAL_ERROR 80
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#define TLS13_ALERT_INAPPROPRIATE_FALLBACK 86
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#define TLS13_ALERT_USER_CANCELED 90
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#define TLS13_ALERT_MISSING_EXTENSION 109
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#define TLS13_ALERT_UNSUPPORTED_EXTENSION 110
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#define TLS13_ALERT_UNRECOGNIZED_NAME 112
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#define TLS13_ALERT_BAD_CERTIFICATE_STATUS_RESPONSE 113
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#define TLS13_ALERT_UNKNOWN_PSK_IDENTITY 115
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#define TLS13_ALERT_CERTIFICATE_REQUIRED 116
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#define TLS13_ALERT_NO_APPLICATION_PROTOCOL 120
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#define TLS13_INFO_HANDSHAKE_STARTED SSL_CB_HANDSHAKE_START
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#define TLS13_INFO_HANDSHAKE_COMPLETED SSL_CB_HANDSHAKE_DONE
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typedef void (*tls13_alert_cb)(uint8_t _alert_desc, void *_cb_arg);
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typedef ssize_t (*tls13_phh_recv_cb)(void *_cb_arg, CBS *_cbs);
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typedef void (*tls13_phh_sent_cb)(void *_cb_arg);
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typedef ssize_t (*tls13_read_cb)(void *_buf, size_t _buflen, void *_cb_arg);
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typedef ssize_t (*tls13_write_cb)(const void *_buf, size_t _buflen,
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void *_cb_arg);
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typedef void (*tls13_handshake_message_cb)(void *_cb_arg);
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typedef void (*tls13_info_cb)(void *_cb_arg, int _state, int _ret);
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typedef int (*tls13_ocsp_status_cb)(void *_cb_arg);
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/*
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* Buffers.
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*/
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struct tls13_buffer;
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struct tls13_buffer *tls13_buffer_new(size_t init_size);
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int tls13_buffer_set_data(struct tls13_buffer *buf, CBS *data);
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void tls13_buffer_free(struct tls13_buffer *buf);
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ssize_t tls13_buffer_extend(struct tls13_buffer *buf, size_t len,
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tls13_read_cb read_cb, void *cb_arg);
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void tls13_buffer_cbs(struct tls13_buffer *buf, CBS *cbs);
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int tls13_buffer_finish(struct tls13_buffer *buf, uint8_t **out,
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size_t *out_len);
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/*
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* Secrets.
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*/
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struct tls13_secret {
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uint8_t *data;
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size_t len;
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};
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/* RFC 8446 Section 7.1 Page 92 */
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struct tls13_secrets {
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const EVP_MD *digest;
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int resumption;
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int init_done;
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int early_done;
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int handshake_done;
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int schedule_done;
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int insecure; /* Set by tests */
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struct tls13_secret zeros;
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struct tls13_secret empty_hash;
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struct tls13_secret extracted_early;
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struct tls13_secret binder_key;
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struct tls13_secret client_early_traffic;
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struct tls13_secret early_exporter_master;
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struct tls13_secret derived_early;
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struct tls13_secret extracted_handshake;
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struct tls13_secret client_handshake_traffic;
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struct tls13_secret server_handshake_traffic;
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struct tls13_secret derived_handshake;
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struct tls13_secret extracted_master;
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struct tls13_secret client_application_traffic;
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struct tls13_secret server_application_traffic;
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struct tls13_secret exporter_master;
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struct tls13_secret resumption_master;
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};
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struct tls13_secrets *tls13_secrets_create(const EVP_MD *digest,
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int resumption);
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void tls13_secrets_destroy(struct tls13_secrets *secrets);
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int tls13_hkdf_expand_label(struct tls13_secret *out, const EVP_MD *digest,
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const struct tls13_secret *secret, const char *label,
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const struct tls13_secret *context);
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int tls13_derive_early_secrets(struct tls13_secrets *secrets, uint8_t *psk,
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size_t psk_len, const struct tls13_secret *context);
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int tls13_derive_handshake_secrets(struct tls13_secrets *secrets,
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const uint8_t *ecdhe, size_t ecdhe_len, const struct tls13_secret *context);
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int tls13_derive_application_secrets(struct tls13_secrets *secrets,
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const struct tls13_secret *context);
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int tls13_update_client_traffic_secret(struct tls13_secrets *secrets);
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int tls13_update_server_traffic_secret(struct tls13_secrets *secrets);
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/*
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* Key shares.
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*/
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struct tls13_key_share;
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struct tls13_key_share *tls13_key_share_new(uint16_t group_id);
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struct tls13_key_share *tls13_key_share_new_nid(int nid);
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void tls13_key_share_free(struct tls13_key_share *ks);
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uint16_t tls13_key_share_group(struct tls13_key_share *ks);
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int tls13_key_share_peer_pkey(struct tls13_key_share *ks, EVP_PKEY *pkey);
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int tls13_key_share_generate(struct tls13_key_share *ks);
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int tls13_key_share_public(struct tls13_key_share *ks, CBB *cbb);
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int tls13_key_share_peer_public(struct tls13_key_share *ks, uint16_t group,
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CBS *cbs);
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int tls13_key_share_derive(struct tls13_key_share *ks, uint8_t **shared_key,
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size_t *shared_key_len);
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/*
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* Record Layer.
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*/
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struct tls13_record_layer;
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struct tls13_record_layer_callbacks {
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tls13_read_cb wire_read;
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tls13_write_cb wire_write;
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tls13_alert_cb alert_recv;
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tls13_alert_cb alert_sent;
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tls13_phh_recv_cb phh_recv;
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tls13_phh_sent_cb phh_sent;
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};
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struct tls13_record_layer *tls13_record_layer_new(
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const struct tls13_record_layer_callbacks *callbacks, void *cb_arg);
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void tls13_record_layer_free(struct tls13_record_layer *rl);
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void tls13_record_layer_allow_ccs(struct tls13_record_layer *rl, int allow);
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void tls13_record_layer_allow_legacy_alerts(struct tls13_record_layer *rl, int allow);
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void tls13_record_layer_rbuf(struct tls13_record_layer *rl, CBS *cbs);
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void tls13_record_layer_set_aead(struct tls13_record_layer *rl,
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const EVP_AEAD *aead);
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void tls13_record_layer_set_hash(struct tls13_record_layer *rl,
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const EVP_MD *hash);
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void tls13_record_layer_set_legacy_version(struct tls13_record_layer *rl,
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uint16_t version);
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void tls13_record_layer_set_retry_after_phh(struct tls13_record_layer *rl, int retry);
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void tls13_record_layer_handshake_completed(struct tls13_record_layer *rl);
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int tls13_record_layer_set_read_traffic_key(struct tls13_record_layer *rl,
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struct tls13_secret *read_key);
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int tls13_record_layer_set_write_traffic_key(struct tls13_record_layer *rl,
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struct tls13_secret *write_key);
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ssize_t tls13_record_layer_send_pending(struct tls13_record_layer *rl);
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ssize_t tls13_record_layer_phh(struct tls13_record_layer *rl, CBS *cbs);
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ssize_t tls13_read_handshake_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
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ssize_t tls13_write_handshake_data(struct tls13_record_layer *rl, const uint8_t *buf,
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size_t n);
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ssize_t tls13_pending_application_data(struct tls13_record_layer *rl);
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ssize_t tls13_peek_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
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ssize_t tls13_read_application_data(struct tls13_record_layer *rl, uint8_t *buf, size_t n);
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ssize_t tls13_write_application_data(struct tls13_record_layer *rl, const uint8_t *buf,
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size_t n);
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ssize_t tls13_send_alert(struct tls13_record_layer *rl, uint8_t alert_desc);
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ssize_t tls13_send_dummy_ccs(struct tls13_record_layer *rl);
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/*
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* Handshake Messages.
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*/
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struct tls13_handshake_msg;
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struct tls13_handshake_msg *tls13_handshake_msg_new(void);
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void tls13_handshake_msg_free(struct tls13_handshake_msg *msg);
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void tls13_handshake_msg_data(struct tls13_handshake_msg *msg, CBS *cbs);
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int tls13_handshake_msg_set_buffer(struct tls13_handshake_msg *msg, CBS *cbs);
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uint8_t tls13_handshake_msg_type(struct tls13_handshake_msg *msg);
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int tls13_handshake_msg_content(struct tls13_handshake_msg *msg, CBS *cbs);
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int tls13_handshake_msg_start(struct tls13_handshake_msg *msg, CBB *body,
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uint8_t msg_type);
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int tls13_handshake_msg_finish(struct tls13_handshake_msg *msg);
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int tls13_handshake_msg_recv(struct tls13_handshake_msg *msg,
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struct tls13_record_layer *rl);
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int tls13_handshake_msg_send(struct tls13_handshake_msg *msg,
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struct tls13_record_layer *rl);
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struct tls13_handshake_stage {
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uint8_t hs_type;
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uint8_t message_number;
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};
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struct ssl_handshake_tls13_st;
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struct tls13_error {
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int code;
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int subcode;
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int errnum;
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const char *file;
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int line;
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char *msg;
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};
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struct tls13_ctx {
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struct tls13_error error;
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SSL *ssl;
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struct ssl_handshake_tls13_st *hs;
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uint8_t mode;
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struct tls13_handshake_stage handshake_stage;
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int handshake_started;
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int handshake_completed;
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int middlebox_compat;
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int send_dummy_ccs;
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int send_dummy_ccs_after;
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int close_notify_sent;
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int close_notify_recv;
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const EVP_AEAD *aead;
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const EVP_MD *hash;
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struct tls13_record_layer *rl;
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struct tls13_handshake_msg *hs_msg;
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uint8_t key_update_request;
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uint8_t alert;
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int phh_count;
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time_t phh_last_seen;
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tls13_handshake_message_cb handshake_message_sent_cb;
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tls13_handshake_message_cb handshake_message_recv_cb;
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tls13_info_cb info_cb;
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tls13_ocsp_status_cb ocsp_status_recv_cb;
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};
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#ifndef TLS13_PHH_LIMIT_TIME
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#define TLS13_PHH_LIMIT_TIME 3600
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#endif
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#ifndef TLS13_PHH_LIMIT
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#define TLS13_PHH_LIMIT 100
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#endif
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struct tls13_ctx *tls13_ctx_new(int mode);
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void tls13_ctx_free(struct tls13_ctx *ctx);
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const EVP_AEAD *tls13_cipher_aead(const SSL_CIPHER *cipher);
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const EVP_MD *tls13_cipher_hash(const SSL_CIPHER *cipher);
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/*
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* Legacy interfaces.
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*/
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int tls13_use_legacy_client(struct tls13_ctx *ctx);
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int tls13_use_legacy_server(struct tls13_ctx *ctx);
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int tls13_legacy_accept(SSL *ssl);
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int tls13_legacy_connect(SSL *ssl);
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int tls13_legacy_return_code(SSL *ssl, ssize_t ret);
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ssize_t tls13_legacy_wire_read_cb(void *buf, size_t n, void *arg);
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ssize_t tls13_legacy_wire_write_cb(const void *buf, size_t n, void *arg);
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int tls13_legacy_pending(const SSL *ssl);
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int tls13_legacy_read_bytes(SSL *ssl, int type, unsigned char *buf, int len,
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int peek);
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int tls13_legacy_write_bytes(SSL *ssl, int type, const void *buf, int len);
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int tls13_legacy_shutdown(SSL *ssl);
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int tls13_legacy_servername_process(struct tls13_ctx *ctx, uint8_t *alert);
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/*
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* Message Types - RFC 8446, Section B.3.
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*
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* Values listed as "_RESERVED" were used in previous versions of TLS and are
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* listed here for completeness. TLS 1.3 implementations MUST NOT send them but
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* might receive them from older TLS implementations.
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*/
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#define TLS13_MT_HELLO_REQUEST_RESERVED 0
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#define TLS13_MT_CLIENT_HELLO 1
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#define TLS13_MT_SERVER_HELLO 2
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#define TLS13_MT_HELLO_VERIFY_REQUEST_RESERVED 3
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#define TLS13_MT_NEW_SESSION_TICKET 4
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#define TLS13_MT_END_OF_EARLY_DATA 5
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#define TLS13_MT_HELLO_RETRY_REQUEST_RESERVED 6
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#define TLS13_MT_ENCRYPTED_EXTENSIONS 8
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#define TLS13_MT_CERTIFICATE 11
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#define TLS13_MT_SERVER_KEY_EXCHANGE_RESERVED 12
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#define TLS13_MT_CERTIFICATE_REQUEST 13
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#define TLS13_MT_SERVER_HELLO_DONE_RESERVED 14
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#define TLS13_MT_CERTIFICATE_VERIFY 15
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#define TLS13_MT_CLIENT_KEY_EXCHANGE_RESERVED 16
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#define TLS13_MT_FINISHED 20
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#define TLS13_MT_CERTIFICATE_URL_RESERVED 21
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#define TLS13_MT_CERTIFICATE_STATUS_RESERVED 22
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#define TLS13_MT_SUPPLEMENTAL_DATA_RESERVED 23
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#define TLS13_MT_KEY_UPDATE 24
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#define TLS13_MT_MESSAGE_HASH 254
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int tls13_handshake_msg_record(struct tls13_ctx *ctx);
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int tls13_handshake_perform(struct tls13_ctx *ctx);
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int tls13_client_init(struct tls13_ctx *ctx);
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int tls13_server_init(struct tls13_ctx *ctx);
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int tls13_client_connect(struct tls13_ctx *ctx);
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int tls13_server_accept(struct tls13_ctx *ctx);
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int tls13_client_hello_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_hello_sent(struct tls13_ctx *ctx);
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int tls13_client_hello_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_hello_retry_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_hello_retry_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_end_of_early_data_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_end_of_early_data_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_certificate_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_certificate_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_finished_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_client_finished_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_client_finished_sent(struct tls13_ctx *ctx);
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int tls13_server_hello_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_hello_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_hello_sent(struct tls13_ctx *ctx);
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int tls13_server_hello_retry_request_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_hello_retry_request_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_hello_retry_request_sent(struct tls13_ctx *ctx);
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int tls13_server_encrypted_extensions_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_encrypted_extensions_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_certificate_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_certificate_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_certificate_request_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_certificate_request_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_certificate_verify_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_certificate_verify_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_finished_recv(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_server_finished_send(struct tls13_ctx *ctx, CBB *cbb);
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int tls13_server_finished_sent(struct tls13_ctx *ctx);
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void tls13_error_clear(struct tls13_error *error);
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int tls13_cert_add(struct tls13_ctx *ctx, CBB *cbb, X509 *cert,
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int(*build_extensions)(SSL *s, uint16_t msg_type, CBB *cbb));
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int tls13_synthetic_handshake_message(struct tls13_ctx *ctx);
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int tls13_clienthello_hash_init(struct tls13_ctx *ctx);
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void tls13_clienthello_hash_clear(struct ssl_handshake_tls13_st *hs);
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int tls13_clienthello_hash_update_bytes(struct tls13_ctx *ctx, void *data,
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size_t len);
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int tls13_clienthello_hash_update(struct tls13_ctx *ctx, CBS *cbs);
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int tls13_clienthello_hash_finalize(struct tls13_ctx *ctx);
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int tls13_clienthello_hash_validate(struct tls13_ctx *ctx);
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int tls13_error_set(struct tls13_error *error, int code, int subcode,
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const char *file, int line, const char *fmt, ...);
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int tls13_error_setx(struct tls13_error *error, int code, int subcode,
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const char *file, int line, const char *fmt, ...);
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#define tls13_set_error(ctx, code, subcode, fmt, ...) \
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tls13_error_set(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \
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(fmt), __VA_ARGS__)
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#define tls13_set_errorx(ctx, code, subcode, fmt, ...) \
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tls13_error_setx(&(ctx)->error, (code), (subcode), __FILE__, __LINE__, \
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(fmt), __VA_ARGS__)
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extern const uint8_t tls13_downgrade_12[8];
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extern const uint8_t tls13_downgrade_11[8];
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extern const uint8_t tls13_hello_retry_request_hash[32];
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extern const uint8_t tls13_cert_verify_pad[64];
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extern const uint8_t tls13_cert_client_verify_context[];
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extern const uint8_t tls13_cert_server_verify_context[];
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__END_HIDDEN_DECLS
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#endif
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