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/* $OpenBSD: tls_internal.h,v 1.10 2022/11/10 18:06:37 jsing Exp $ */
/*
* Copyright (c) 2018, 2019, 2021 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_TLS_INTERNAL_H
#define HEADER_TLS_INTERNAL_H
#include <openssl/dh.h>
#include <openssl/evp.h>
#include "bytestring.h"
__BEGIN_HIDDEN_DECLS
#define TLS_IO_SUCCESS 1
#define TLS_IO_EOF 0
#define TLS_IO_FAILURE -1
#define TLS_IO_ALERT -2
#define TLS_IO_WANT_POLLIN -3
#define TLS_IO_WANT_POLLOUT -4
#define TLS_IO_WANT_RETRY -5 /* Retry the previous call immediately. */
enum ssl_encryption_level_t;
struct tls13_secret;
/*
* Callbacks.
*/
typedef ssize_t (*tls_read_cb)(void *_buf, size_t _buflen, void *_cb_arg);
typedef ssize_t (*tls_write_cb)(const void *_buf, size_t _buflen,
void *_cb_arg);
typedef ssize_t (*tls_flush_cb)(void *_cb_arg);
typedef ssize_t (*tls_handshake_read_cb)(void *_buf, size_t _buflen,
void *_cb_arg);
typedef ssize_t (*tls_handshake_write_cb)(const void *_buf, size_t _buflen,
void *_cb_arg);
typedef int (*tls_traffic_key_cb)(struct tls13_secret *key,
enum ssl_encryption_level_t level, void *_cb_arg);
typedef int (*tls_alert_send_cb)(int _alert_desc, void *_cb_arg);
/*
* Buffers.
*/
struct tls_buffer;
struct tls_buffer *tls_buffer_new(size_t init_size);
void tls_buffer_clear(struct tls_buffer *buf);
void tls_buffer_free(struct tls_buffer *buf);
void tls_buffer_set_capacity_limit(struct tls_buffer *buf, size_t limit);
ssize_t tls_buffer_extend(struct tls_buffer *buf, size_t len,
tls_read_cb read_cb, void *cb_arg);
size_t tls_buffer_remaining(struct tls_buffer *buf);
ssize_t tls_buffer_read(struct tls_buffer *buf, uint8_t *rbuf, size_t n);
ssize_t tls_buffer_write(struct tls_buffer *buf, const uint8_t *wbuf, size_t n);
int tls_buffer_append(struct tls_buffer *buf, const uint8_t *wbuf, size_t n);
int tls_buffer_data(struct tls_buffer *buf, CBS *cbs);
int tls_buffer_finish(struct tls_buffer *buf, uint8_t **out, size_t *out_len);
/*
* Key shares.
*/
struct tls_key_share;
struct tls_key_share *tls_key_share_new(uint16_t group_id);
struct tls_key_share *tls_key_share_new_nid(int nid);
void tls_key_share_free(struct tls_key_share *ks);
uint16_t tls_key_share_group(struct tls_key_share *ks);
int tls_key_share_nid(struct tls_key_share *ks);
void tls_key_share_set_key_bits(struct tls_key_share *ks, size_t key_bits);
int tls_key_share_set_dh_params(struct tls_key_share *ks, DH *dh_params);
int tls_key_share_peer_pkey(struct tls_key_share *ks, EVP_PKEY *pkey);
int tls_key_share_generate(struct tls_key_share *ks);
int tls_key_share_params(struct tls_key_share *ks, CBB *cbb);
int tls_key_share_public(struct tls_key_share *ks, CBB *cbb);
int tls_key_share_peer_params(struct tls_key_share *ks, CBS *cbs,
int *decode_error, int *invalid_params);
int tls_key_share_peer_public(struct tls_key_share *ks, CBS *cbs,
int *decode_error, int *invalid_key);
int tls_key_share_derive(struct tls_key_share *ks, uint8_t **shared_key,
size_t *shared_key_len);
int tls_key_share_peer_security(const SSL *ssl, struct tls_key_share *ks);
__END_HIDDEN_DECLS
#endif
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