1/*
2 * Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
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
21#define END_OF_EARLY_DATA_MAX_LENGTH    0
22#define SERVER_HELLO_MAX_LENGTH         20000
23#define HELLO_RETRY_REQUEST_MAX_LENGTH  20000
24#define ENCRYPTED_EXTENSIONS_MAX_LENGTH 20000
25#define SERVER_KEY_EXCH_MAX_LENGTH      102400
26#define SERVER_HELLO_DONE_MAX_LENGTH    0
27#define KEY_UPDATE_MAX_LENGTH           1
28#define CCS_MAX_LENGTH                  1
29/* Max should actually be 36 but we are generous */
30#define FINISHED_MAX_LENGTH             64
31
32/* Dummy message type */
33#define SSL3_MT_DUMMY   -1
34
35extern const unsigned char hrrrandom[];
36
37/* Message processing return codes */
38typedef enum {
39    /* Something bad happened */
40    MSG_PROCESS_ERROR,
41    /* We've finished reading - swap to writing */
42    MSG_PROCESS_FINISHED_READING,
43    /*
44     * We've completed the main processing of this message but there is some
45     * post processing to be done.
46     */
47    MSG_PROCESS_CONTINUE_PROCESSING,
48    /* We've finished this message - read the next message */
49    MSG_PROCESS_CONTINUE_READING
50} MSG_PROCESS_RETURN;
51
52typedef int (*confunc_f) (SSL *s, WPACKET *pkt);
53
54int ssl3_take_mac(SSL *s);
55int check_in_list(SSL *s, uint16_t group_id, const uint16_t *groups,
56                  size_t num_groups, int checkallow);
57int create_synthetic_message_hash(SSL *s, const unsigned char *hashval,
58                                  size_t hashlen, const unsigned char *hrr,
59                                  size_t hrrlen);
60int parse_ca_names(SSL *s, PACKET *pkt);
61const STACK_OF(X509_NAME) *get_ca_names(SSL *s);
62int construct_ca_names(SSL *s, const STACK_OF(X509_NAME) *ca_sk, WPACKET *pkt);
63size_t construct_key_exchange_tbs(SSL *s, unsigned char **ptbs,
64                                  const void *param, size_t paramlen);
65
66/*
67 * TLS/DTLS client state machine functions
68 */
69int ossl_statem_client_read_transition(SSL *s, int mt);
70WRITE_TRAN ossl_statem_client_write_transition(SSL *s);
71WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst);
72WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst);
73int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
74                                         confunc_f *confunc, int *mt);
75size_t ossl_statem_client_max_message_size(SSL *s);
76MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt);
77WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst);
78
79/*
80 * TLS/DTLS server state machine functions
81 */
82int ossl_statem_server_read_transition(SSL *s, int mt);
83WRITE_TRAN ossl_statem_server_write_transition(SSL *s);
84WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst);
85WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst);
86int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
87                                         confunc_f *confunc,int *mt);
88size_t ossl_statem_server_max_message_size(SSL *s);
89MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt);
90WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst);
91
92/* Functions for getting new message data */
93__owur int tls_get_message_header(SSL *s, int *mt);
94__owur int tls_get_message_body(SSL *s, size_t *len);
95__owur int dtls_get_message(SSL *s, int *mt, size_t *len);
96
97/* Message construction and processing functions */
98__owur int tls_process_initial_server_flight(SSL *s);
99__owur MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt);
100__owur MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt);
101__owur int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
102__owur int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt);
103
104__owur int tls_construct_finished(SSL *s, WPACKET *pkt);
105__owur int tls_construct_key_update(SSL *s, WPACKET *pkt);
106__owur MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt);
107__owur WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst, int clearbufs,
108                                       int stop);
109__owur WORK_STATE dtls_wait_for_dry(SSL *s);
110
111/* some client-only functions */
112__owur int tls_construct_client_hello(SSL *s, WPACKET *pkt);
113__owur MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt);
114__owur MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt);
115__owur MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt);
116__owur int tls_process_cert_status_body(SSL *s, PACKET *pkt);
117__owur MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt);
118__owur MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt);
119__owur int tls_construct_cert_verify(SSL *s, WPACKET *pkt);
120__owur WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst);
121__owur int tls_construct_client_certificate(SSL *s, WPACKET *pkt);
122__owur int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey);
123__owur int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt);
124__owur int tls_client_key_exchange_post_work(SSL *s);
125__owur int tls_construct_cert_status_body(SSL *s, WPACKET *pkt);
126__owur int tls_construct_cert_status(SSL *s, WPACKET *pkt);
127__owur MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt);
128__owur MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt);
129__owur int ssl3_check_cert_and_algorithm(SSL *s);
130#ifndef OPENSSL_NO_NEXTPROTONEG
131__owur int tls_construct_next_proto(SSL *s, WPACKET *pkt);
132#endif
133__owur MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt);
134__owur MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt);
135__owur int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt);
136
137/* some server-only functions */
138__owur MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt);
139__owur WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst);
140__owur int tls_construct_server_hello(SSL *s, WPACKET *pkt);
141__owur int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt);
142__owur int tls_construct_server_certificate(SSL *s, WPACKET *pkt);
143__owur int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt);
144__owur int tls_construct_certificate_request(SSL *s, WPACKET *pkt);
145__owur int tls_construct_server_done(SSL *s, WPACKET *pkt);
146__owur MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt);
147__owur MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt);
148__owur WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst);
149__owur MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt);
150#ifndef OPENSSL_NO_NEXTPROTONEG
151__owur MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt);
152#endif
153__owur int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt);
154MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt);
155
156
157/* Extension processing */
158
159typedef enum ext_return_en {
160    EXT_RETURN_FAIL,
161    EXT_RETURN_SENT,
162    EXT_RETURN_NOT_SENT
163} EXT_RETURN;
164
165__owur int tls_validate_all_contexts(SSL *s, unsigned int thisctx,
166                                     RAW_EXTENSION *exts);
167__owur int extension_is_relevant(SSL *s, unsigned int extctx,
168                                 unsigned int thisctx);
169__owur int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
170                                  RAW_EXTENSION **res, size_t *len, int init);
171__owur int tls_parse_extension(SSL *s, TLSEXT_INDEX idx, int context,
172                               RAW_EXTENSION *exts,  X509 *x, size_t chainidx);
173__owur int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
174                                    X509 *x, size_t chainidx, int fin);
175__owur int should_add_extension(SSL *s, unsigned int extctx,
176                                unsigned int thisctx, int max_version);
177__owur int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
178                                    X509 *x, size_t chainidx);
179
180__owur int tls_psk_do_binder(SSL *s, const EVP_MD *md,
181                             const unsigned char *msgstart,
182                             size_t binderoffset, const unsigned char *binderin,
183                             unsigned char *binderout,
184                             SSL_SESSION *sess, int sign, int external);
185
186/* Server Extension processing */
187int tls_parse_ctos_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
188                               X509 *x, size_t chainidx);
189int tls_parse_ctos_server_name(SSL *s, PACKET *pkt, unsigned int context,
190                               X509 *x, size_t chainidx);
191int tls_parse_ctos_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
192                                  X509 *x, size_t chainidx);
193#ifndef OPENSSL_NO_SRP
194int tls_parse_ctos_srp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
195                       size_t chainidx);
196#endif
197int tls_parse_ctos_early_data(SSL *s, PACKET *pkt, unsigned int context,
198                              X509 *x, size_t chainidx);
199#ifndef OPENSSL_NO_EC
200int tls_parse_ctos_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
201                                 X509 *x, size_t chainidx);
202int tls_parse_ctos_supported_groups(SSL *s, PACKET *pkt, unsigned int context,
203                                    X509 *x, size_t chainidxl);
204#endif
205int tls_parse_ctos_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
206                                  X509 *x, size_t chainidx);
207int tls_parse_ctos_sig_algs_cert(SSL *s, PACKET *pkt, unsigned int context,
208                                 X509 *x, size_t chainidx);
209int tls_parse_ctos_sig_algs(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
210                            size_t chainidx);
211#ifndef OPENSSL_NO_OCSP
212int tls_parse_ctos_status_request(SSL *s, PACKET *pkt, unsigned int context,
213                                  X509 *x, size_t chainidx);
214#endif
215#ifndef OPENSSL_NO_NEXTPROTONEG
216int tls_parse_ctos_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
217                       size_t chainidx);
218#endif
219int tls_parse_ctos_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
220                        size_t chainidx);
221#ifndef OPENSSL_NO_SRTP
222int tls_parse_ctos_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
223                            size_t chainidx);
224#endif
225int tls_parse_ctos_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
226                       size_t chainidx);
227int tls_parse_ctos_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
228                             size_t chainidx);
229int tls_parse_ctos_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
230                          size_t chainidx);
231int tls_parse_ctos_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
232                       size_t chainidx);
233int tls_parse_ctos_psk_kex_modes(SSL *s, PACKET *pkt, unsigned int context,
234                                 X509 *x, size_t chainidx);
235int tls_parse_ctos_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
236                       size_t chainidx);
237int tls_parse_ctos_post_handshake_auth(SSL *, PACKET *pkt, unsigned int context,
238                                       X509 *x, size_t chainidx);
239
240EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt,
241                                          unsigned int context, X509 *x,
242                                          size_t chainidx);
243EXT_RETURN tls_construct_stoc_server_name(SSL *s, WPACKET *pkt,
244                                          unsigned int context, X509 *x,
245                                          size_t chainidx);
246EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
247                                         unsigned int context, X509 *x,
248                                         size_t chainidx);
249EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt,
250                                             unsigned int context, X509 *x,
251                                             size_t chainidx);
252#ifndef OPENSSL_NO_EC
253EXT_RETURN tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt,
254                                            unsigned int context, X509 *x,
255                                            size_t chainidx);
256#endif
257EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
258                                               unsigned int context, X509 *x,
259                                               size_t chainidx);
260EXT_RETURN tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
261                                             unsigned int context, X509 *x,
262                                             size_t chainidx);
263#ifndef OPENSSL_NO_OCSP
264EXT_RETURN tls_construct_stoc_status_request(SSL *s, WPACKET *pkt,
265                                             unsigned int context, X509 *x,
266                                             size_t chainidx);
267#endif
268#ifndef OPENSSL_NO_NEXTPROTONEG
269EXT_RETURN tls_construct_stoc_next_proto_neg(SSL *s, WPACKET *pkt,
270                                             unsigned int context, X509 *x,
271                                             size_t chainidx);
272#endif
273EXT_RETURN tls_construct_stoc_alpn(SSL *s, WPACKET *pkt, unsigned int context,
274                                   X509 *x, size_t chainidx);
275#ifndef OPENSSL_NO_SRTP
276EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
277                                X509 *x, size_t chainidx);
278#endif
279EXT_RETURN tls_construct_stoc_etm(SSL *s, WPACKET *pkt, unsigned int context,
280                                  X509 *x, size_t chainidx);
281EXT_RETURN tls_construct_stoc_ems(SSL *s, WPACKET *pkt, unsigned int context,
282                                  X509 *x, size_t chainidx);
283EXT_RETURN tls_construct_stoc_supported_versions(SSL *s, WPACKET *pkt,
284                                                 unsigned int context, X509 *x,
285                                                 size_t chainidx);
286EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt,
287                                        unsigned int context, X509 *x,
288                                        size_t chainidx);
289EXT_RETURN tls_construct_stoc_cookie(SSL *s, WPACKET *pkt, unsigned int context,
290                                     X509 *x, size_t chainidx);
291/*
292 * Not in public headers as this is not an official extension. Only used when
293 * SSL_OP_CRYPTOPRO_TLSEXT_BUG is set.
294 */
295#define TLSEXT_TYPE_cryptopro_bug      0xfde8
296EXT_RETURN tls_construct_stoc_cryptopro_bug(SSL *s, WPACKET *pkt,
297                                            unsigned int context, X509 *x,
298                                            size_t chainidx);
299EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context,
300                                  X509 *x, size_t chainidx);
301
302/* Client Extension processing */
303EXT_RETURN tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, unsigned int context,
304                                   X509 *x, size_t chainidx);
305EXT_RETURN tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context,
306                                   X509 *x, size_t chainidx);
307EXT_RETURN tls_construct_ctos_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context,
308                                             X509 *x, size_t chainidx);
309#ifndef OPENSSL_NO_SRP
310EXT_RETURN tls_construct_ctos_srp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,
311                           size_t chainidx);
312#endif
313#ifndef OPENSSL_NO_EC
314EXT_RETURN tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt,
315                                            unsigned int context, X509 *x,
316                                            size_t chainidx);
317EXT_RETURN tls_construct_ctos_supported_groups(SSL *s, WPACKET *pkt,
318                                               unsigned int context, X509 *x,
319                                               size_t chainidx);
320#endif
321EXT_RETURN tls_construct_ctos_early_data(SSL *s, WPACKET *pkt,
322                                         unsigned int context, X509 *x,
323                                         size_t chainidx);
324EXT_RETURN tls_construct_ctos_session_ticket(SSL *s, WPACKET *pkt,
325                                             unsigned int context, X509 *x,
326                                             size_t chainidx);
327EXT_RETURN tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt,
328                                       unsigned int context, X509 *x,
329                                       size_t chainidx);
330#ifndef OPENSSL_NO_OCSP
331EXT_RETURN tls_construct_ctos_status_request(SSL *s, WPACKET *pkt,
332                                             unsigned int context, X509 *x,
333                                             size_t chainidx);
334#endif
335#ifndef OPENSSL_NO_NEXTPROTONEG
336EXT_RETURN tls_construct_ctos_npn(SSL *s, WPACKET *pkt, unsigned int context,
337                                  X509 *x, size_t chainidx);
338#endif
339EXT_RETURN tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context,
340                                   X509 *x, size_t chainidx);
341#ifndef OPENSSL_NO_SRTP
342EXT_RETURN tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, unsigned int context,
343                                       X509 *x, size_t chainidx);
344#endif
345EXT_RETURN tls_construct_ctos_etm(SSL *s, WPACKET *pkt, unsigned int context,
346                                  X509 *x, size_t chainidx);
347#ifndef OPENSSL_NO_CT
348EXT_RETURN tls_construct_ctos_sct(SSL *s, WPACKET *pkt, unsigned int context,
349                                  X509 *x, size_t chainidx);
350#endif
351EXT_RETURN tls_construct_ctos_ems(SSL *s, WPACKET *pkt, unsigned int context,
352                                  X509 *x, size_t chainidx);
353EXT_RETURN tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt,
354                                                 unsigned int context, X509 *x,
355                                                 size_t chainidx);
356EXT_RETURN tls_construct_ctos_key_share(SSL *s, WPACKET *pkt,
357                                        unsigned int context, X509 *x,
358                                        size_t chainidx);
359EXT_RETURN tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt,
360                                            unsigned int context, X509 *x,
361                                            size_t chainidx);
362EXT_RETURN tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
363                                     X509 *x, size_t chainidx);
364EXT_RETURN tls_construct_ctos_padding(SSL *s, WPACKET *pkt,
365                                      unsigned int context, X509 *x,
366                                      size_t chainidx);
367EXT_RETURN tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context,
368                                  X509 *x, size_t chainidx);
369EXT_RETURN tls_construct_ctos_post_handshake_auth(SSL *s, WPACKET *pkt, unsigned int context,
370                                                  X509 *x, size_t chainidx);
371
372int tls_parse_stoc_renegotiate(SSL *s, PACKET *pkt, unsigned int context,
373                               X509 *x, size_t chainidx);
374int tls_parse_stoc_server_name(SSL *s, PACKET *pkt, unsigned int context,
375                               X509 *x, size_t chainidx);
376int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
377                              X509 *x, size_t chainidx);
378int tls_parse_stoc_maxfragmentlen(SSL *s, PACKET *pkt, unsigned int context,
379                                  X509 *x, size_t chainidx);
380#ifndef OPENSSL_NO_EC
381int tls_parse_stoc_ec_pt_formats(SSL *s, PACKET *pkt, unsigned int context,
382                                 X509 *x, size_t chainidx);
383#endif
384int tls_parse_stoc_session_ticket(SSL *s, PACKET *pkt, unsigned int context,
385                                  X509 *x, size_t chainidx);
386#ifndef OPENSSL_NO_OCSP
387int tls_parse_stoc_status_request(SSL *s, PACKET *pkt, unsigned int context,
388                                  X509 *x, size_t chainidx);
389#endif
390#ifndef OPENSSL_NO_CT
391int tls_parse_stoc_sct(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
392                       size_t chainidx);
393#endif
394#ifndef OPENSSL_NO_NEXTPROTONEG
395int tls_parse_stoc_npn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
396                       size_t chainidx);
397#endif
398int tls_parse_stoc_alpn(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
399                        size_t chainidx);
400#ifndef OPENSSL_NO_SRTP
401int tls_parse_stoc_use_srtp(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
402                            size_t chainidx);
403#endif
404int tls_parse_stoc_etm(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
405                       size_t chainidx);
406int tls_parse_stoc_ems(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
407                       size_t chainidx);
408int tls_parse_stoc_supported_versions(SSL *s, PACKET *pkt, unsigned int context,
409                                      X509 *x, size_t chainidx);
410int tls_parse_stoc_key_share(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
411                             size_t chainidx);
412int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
413                       size_t chainidx);
414int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
415                       size_t chainidx);
416
417int tls_handle_alpn(SSL *s);
418
419int tls13_save_handshake_digest_for_pha(SSL *s);
420int tls13_restore_handshake_digest_for_pha(SSL *s);
421