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Make sure we save ALPN data in the session
[thirdparty/openssl.git] / ssl / statem / statem_locl.h
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846e33c7
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1/*
2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
61ae935a 3 *
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4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
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8 */
9
10/*****************************************************************************
11 * *
12 * The following definitions are PRIVATE to the state machine. They should *
13 * NOT be used outside of the state machine. *
14 * *
15 *****************************************************************************/
16
17/* Max message length definitions */
18
19/* The spec allows for a longer length than this, but we limit it */
20#define HELLO_VERIFY_REQUEST_MAX_LENGTH 258
ef6c191b 21#define END_OF_EARLY_DATA_MAX_LENGTH 0
61ae935a 22#define SERVER_HELLO_MAX_LENGTH 20000
3847d426 23#define HELLO_RETRY_REQUEST_MAX_LENGTH 20000
e46f2334 24#define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000
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25#define SERVER_KEY_EXCH_MAX_LENGTH 102400
26#define SERVER_HELLO_DONE_MAX_LENGTH 0
e1c3de44 27#define KEY_UPDATE_MAX_LENGTH 1
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28#define CCS_MAX_LENGTH 1
29/* Max should actually be 36 but we are generous */
30#define FINISHED_MAX_LENGTH 64
31
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32/* The maximum number of incoming KeyUpdate messages we will accept */
33#define MAX_KEY_UPDATE_MESSAGES 32
34
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35/* Dummy message type */
36#define SSL3_MT_DUMMY -1
37
61ae935a 38/* Message processing return codes */
be3583fa 39typedef enum {
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40 /* Something bad happened */
41 MSG_PROCESS_ERROR,
42 /* We've finished reading - swap to writing */
43 MSG_PROCESS_FINISHED_READING,
44 /*
45 * We've completed the main processing of this message but there is some
46 * post processing to be done.
47 */
48 MSG_PROCESS_CONTINUE_PROCESSING,
49 /* We've finished this message - read the next message */
50 MSG_PROCESS_CONTINUE_READING
be3583fa 51} MSG_PROCESS_RETURN;
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52
53/* Flush the write BIO */
54int statem_flush(SSL *s);
55
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56typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
57
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58#define GET_GROUP_ID(group, idx) \
59 (unsigned int)(((group)[(idx) * 2] << 8) | (group)[((idx) * 2) + 1])
60
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61int check_in_list(SSL *s, unsigned int group_id, const unsigned char *groups,
62 size_t num_groups, int checkallow);
11c67eea 63int create_synthetic_message_hash(SSL *s);
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DSH
64int parse_ca_names(SSL *s, PACKET *pkt, int *al);
65int construct_ca_names(SSL *s, WPACKET *pkt);
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DSH
66size_t construct_key_exchange_tbs(const SSL *s, unsigned char **ptbs,
67 const void *param, size_t paramlen);
5d6cca05 68
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69/*
70 * TLS/DTLS client state machine functions
71 */
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72int ossl_statem_client_read_transition(SSL *s, int mt);
73WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
74WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
75WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
6392fb8e 76int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
a15c953f 77 confunc_f *confunc, int *mt);
eda75751 78size_t ossl_statem_client_max_message_size(SSL *s);
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79MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
80WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
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81
82/*
83 * TLS/DTLS server state machine functions
84 */
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85int ossl_statem_server_read_transition(SSL *s, int mt);
86WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
87WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
88WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
6392fb8e 89int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
a15c953f 90 confunc_f *confunc,int *mt);
eda75751 91size_t ossl_statem_server_max_message_size(SSL *s);
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92MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
93WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
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94
95/* Functions for getting new message data */
96__owur int tls_get_message_header(SSL *s, int *mt);
eda75751
MC
97__owur int tls_get_message_body(SSL *s, size_t *len);
98__owur int dtls_get_message(SSL *s, int *mt, size_t *len);
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99
100/* Message construction and processing functions */
7776a36c 101__owur int tls_process_initial_server_flight(SSL *s, int *al);
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102__owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
103__owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
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104__owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
105__owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
61ae935a 106
229185e6 107__owur int tls_construct_finished(SSL *s, WPACKET *pkt);
44c04a2e 108__owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
e1c3de44 109__owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
30f05b19 110__owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs);
be3583fa 111__owur WORK_STATE dtls_wait_for_dry(SSL *s);
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112
113/* some client-only functions */
7cea05dc 114__owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
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115__owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
116__owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
117__owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
f63e4288 118__owur int tls_process_cert_status_body(SSL *s, PACKET *pkt, int *al);
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MC
119__owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
120__owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
d8bc1399 121__owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
be3583fa 122__owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
7cea05dc 123__owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
61ae935a 124__owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
7cea05dc 125__owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
61ae935a 126__owur int tls_client_key_exchange_post_work(SSL *s);
f63e4288 127__owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
7cea05dc 128__owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
a230b26e 129__owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
be3583fa 130__owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
61ae935a 131__owur int ssl3_check_cert_and_algorithm(SSL *s);
a230b26e 132#ifndef OPENSSL_NO_NEXTPROTONEG
7cea05dc 133__owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
a230b26e 134#endif
c7f47786 135__owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
be3583fa 136__owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
ef6c191b 137__owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
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138
139/* some server-only functions */
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140__owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
141__owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
7cea05dc 142__owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
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MC
143__owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
144__owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
145__owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
146__owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
147__owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
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148__owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
149__owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
150__owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
151__owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
a230b26e 152#ifndef OPENSSL_NO_NEXTPROTONEG
be3583fa 153__owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
a230b26e 154#endif
7cea05dc 155__owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
ef6c191b 156MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
6b473aca 157
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MC
158
159/* Extension processing */
160
355a0d10 161typedef enum ext_return_en {
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162 EXT_RETURN_FAIL,
163 EXT_RETURN_SENT,
164 EXT_RETURN_NOT_SENT
165} EXT_RETURN;
166
43ae5eed
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167__owur int extension_is_relevant(SSL *s, unsigned int extctx,
168 unsigned int thisctx);
70af3d8e 169__owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
735d5b59
TT
170 RAW_EXTENSION **res, int *al, size_t *len,
171 int init);
7d152a3c 172__owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
8521ced6 173 RAW_EXTENSION *exts, X509 *x, size_t chainidx,
f97d4c37 174 int *al);
4b299b8e 175__owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
735d5b59 176 X509 *x, size_t chainidx, int *al, int fin);
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177__owur int should_add_extension(SSL *s, unsigned int extctx,
178 unsigned int thisctx, int max_version);
4b299b8e 179__owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
8521ced6 180 X509 *x, size_t chainidx, int *al);
25670f3e 181
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MC
182__owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
183 const unsigned char *msgstart,
184 size_t binderoffset, const unsigned char *binderin,
185 unsigned char *binderout,
3a7c56b2 186 SSL_SESSION *sess, int sign, int external);
1053a6e2 187
25670f3e 188/* Server Extension processing */
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MC
189int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
190 X509 *x, size_t chainidx, int *al);
191int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
192 X509 *x, size_t chainidx, int *al);
25670f3e 193#ifndef OPENSSL_NO_SRP
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194int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
195 size_t chainidx, int *al);
25670f3e 196#endif
0a87d0ac
MC
197int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
198 X509 *x, size_t chainidx, int *al);
25670f3e 199#ifndef OPENSSL_NO_EC
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200int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
201 X509 *x, size_t chainidx, int *al);
202int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
203 X509 *x, size_t chainidx, int *al);
25670f3e 204#endif
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205int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
206 X509 *x, size_t chainidx, int *al);
207int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
208 size_t chainidx, int *al);
ab83e314 209#ifndef OPENSSL_NO_OCSP
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210int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
211 X509 *x, size_t chainidx, int *al);
ab83e314 212#endif
25670f3e 213#ifndef OPENSSL_NO_NEXTPROTONEG
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214int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
215 size_t chainidx, int *al);
25670f3e 216#endif
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MC
217int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
218 size_t chainidx, int *al);
25670f3e 219#ifndef OPENSSL_NO_SRTP
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220int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
221 size_t chainidx, int *al);
25670f3e 222#endif
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223int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
224 size_t chainidx, int *al);
225int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
226 size_t chainidx, int *al);
227int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
228 size_t chainidx, int *al);
229int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
230 X509 *x, size_t chainidx, int *al);
231int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
232 size_t chainidx, int *al);
7da160b0 233
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234EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
235 unsigned int context, X509 *x,
236 size_t chainidx, int *al);
237EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
238 unsigned int context, X509 *x,
239 size_t chainidx, int *al);
240EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
241 unsigned int context, X509 *x,
242 size_t chainidx, int *al);
ab83e314 243#ifndef OPENSSL_NO_EC
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244EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
245 unsigned int context, X509 *x,
246 size_t chainidx, int *al);
ab83e314 247#endif
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248EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
249 unsigned int context, X509 *x,
250 size_t chainidx, int *al);
251EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
252 unsigned int context, X509 *x,
253 size_t chainidx, int *al);
ab83e314 254#ifndef OPENSSL_NO_OCSP
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255EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
256 unsigned int context, X509 *x,
257 size_t chainidx, int *al);
ab83e314
MC
258#endif
259#ifndef OPENSSL_NO_NEXTPROTONEG
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260EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
261 unsigned int context, X509 *x,
262 size_t chainidx, int *al);
ab83e314 263#endif
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264EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
265 X509 *x, size_t chainidx, int *al);
ab83e314 266#ifndef OPENSSL_NO_SRTP
b186a592 267EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
61138358 268 X509 *x, size_t chainidx, int *al);
ab83e314 269#endif
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270EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
271 X509 *x, size_t chainidx, int *al);
272EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
273 X509 *x, size_t chainidx, int *al);
274EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
275 unsigned int context, X509 *x,
276 size_t chainidx, int *al);
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277/*
278 * Not in public headers as this is not an official extension. Only used when
279 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
280 */
281#define TLSEXT_TYPE_cryptopro_bug 0xfde8
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282EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
283 unsigned int context, X509 *x,
284 size_t chainidx, int *al);
285EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
286 X509 *x, size_t chainidx, int *al);
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MC
287
288/* Client Extension processing */
b186a592 289EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
61138358 290 X509 *x, size_t chainidx, int *al);
b186a592 291EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
61138358 292 X509 *x, size_t chainidx, int *al);
ab83e314 293#ifndef OPENSSL_NO_SRP
b186a592 294EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
61138358 295 size_t chainidx, int *al);
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MC
296#endif
297#ifndef OPENSSL_NO_EC
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298EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
299 unsigned int context, X509 *x,
300 size_t chainidx, int *al);
301EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
302 unsigned int context, X509 *x,
303 size_t chainidx, int *al);
ab83e314 304#endif
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305EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
306 unsigned int context, X509 *x,
307 size_t chainidx, int *al);
308EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
309 unsigned int context, X509 *x,
310 size_t chainidx, int *al);
311EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
312 unsigned int context, X509 *x,
313 size_t chainidx, int *al);
ab83e314 314#ifndef OPENSSL_NO_OCSP
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315EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
316 unsigned int context, X509 *x,
317 size_t chainidx, int *al);
ab83e314
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318#endif
319#ifndef OPENSSL_NO_NEXTPROTONEG
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320EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
321 X509 *x, size_t chainidx, int *al);
ab83e314 322#endif
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323EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
324 X509 *x, size_t chainidx, int *al);
ab83e314 325#ifndef OPENSSL_NO_SRTP
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326EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
327 X509 *x, size_t chainidx, int *al);
ab83e314 328#endif
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329EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
330 X509 *x, size_t chainidx, int *al);
ab83e314 331#ifndef OPENSSL_NO_CT
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332EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
333 X509 *x, size_t chainidx, int *al);
ab83e314 334#endif
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335EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
336 X509 *x, size_t chainidx, int *al);
337EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
338 unsigned int context, X509 *x,
339 size_t chainidx, int *al);
340EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
341 unsigned int context, X509 *x,
342 size_t chainidx, int *al);
343EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
344 unsigned int context, X509 *x,
345 size_t chainidx, int *al);
346EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
61138358 347 X509 *x, size_t chainidx, int *al);
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MC
348EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
349 unsigned int context, X509 *x,
350 size_t chainidx, int *al);
351EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
352 X509 *x, size_t chainidx, int *al);
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MC
353int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
354 X509 *x, size_t chainidx, int *al);
355int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
356 X509 *x, size_t chainidx, int *al);
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MC
357int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
358 X509 *x, size_t chainidx, int *al);
6dd083fd 359#ifndef OPENSSL_NO_EC
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360int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
361 X509 *x, size_t chainidx, int *al);
6dd083fd 362#endif
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363int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
364 X509 *x, size_t chainidx, int *al);
ab83e314 365#ifndef OPENSSL_NO_OCSP
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366int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
367 X509 *x, size_t chainidx, int *al);
ab83e314 368#endif
6dd083fd 369#ifndef OPENSSL_NO_CT
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370int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
371 size_t chainidx, int *al);
6dd083fd
MC
372#endif
373#ifndef OPENSSL_NO_NEXTPROTONEG
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374int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
375 size_t chainidx, int *al);
6dd083fd 376#endif
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377int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
378 size_t chainidx, int *al);
6dd083fd 379#ifndef OPENSSL_NO_SRTP
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380int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
381 size_t chainidx, int *al);
6dd083fd 382#endif
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383int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
384 size_t chainidx, int *al);
385int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
386 size_t chainidx, int *al);
387int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
388 size_t chainidx, int *al);
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389int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
390 size_t chainidx, int *al);
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391int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
392 size_t chainidx, int *al);