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Fixed address family test error for AF_UNIX in BIO_ADDR_make
[thirdparty/openssl.git] / ssl / tls13_enc.c
CommitLineData
34574f19
MC		 1/*
2 * Copyright 2016 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#include <stdlib.h>
11#include "ssl_locl.h"
12#include <openssl/evp.h>
13#include <openssl/kdf.h>
14
15#define TLS13_MAX_LABEL_LEN 246
16
17/* Always filled with zeros */
18static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
19
34574f19 20/*
a19ae67d
MC		 21 * Given a |secret|; a |label| of length |labellen|; and |data| of length
22 * |datalen| (e.g. typically a hash of the handshake messages), derive a new
23 * secret |outlen| bytes long and store it in the location pointed to be |out|.
24 * The |data| value may be zero length. Returns 1 on success 0 on failure.
34574f19 25 */
ec15acb6 26int tls13_hkdf_expand(SSL *s, const EVP_MD *md, const unsigned char *secret,
34574f19 27 const unsigned char *label, size_t labellen,
a19ae67d 28 const unsigned char *data, size_t datalen,
34574f19
MC		 29 unsigned char *out, size_t outlen)
30{
17aa119e 31 const unsigned char label_prefix[] = "tls13 ";
34574f19
MC		 32 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
33 int ret;
34 size_t hkdflabellen;
35 size_t hashlen;
36 /*
37 * 2 bytes for length of whole HkdfLabel + 1 byte for length of combined
38 * prefix and label + bytes for the label itself + bytes for the hash
39 */
40 unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
41 + sizeof(label_prefix) + TLS13_MAX_LABEL_LEN
42 + EVP_MAX_MD_SIZE];
43 WPACKET pkt;
44
45 if (pctx == NULL)
46 return 0;
47
48 hashlen = EVP_MD_size(md);
49
50 if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
51 || !WPACKET_put_bytes_u16(&pkt, outlen)
52 || !WPACKET_start_sub_packet_u8(&pkt)
53 || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
54 || !WPACKET_memcpy(&pkt, label, labellen)
55 || !WPACKET_close(&pkt)
a19ae67d 56 || !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
34574f19
MC		 57 || !WPACKET_get_total_written(&pkt, &hkdflabellen)
58 || !WPACKET_finish(&pkt)) {
d49e23ec 59 EVP_PKEY_CTX_free(pctx);
34574f19
MC		 60 WPACKET_cleanup(&pkt);
61 return 0;
62 }
63
64 ret = EVP_PKEY_derive_init(pctx) <= 0
65 || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY)
66 <= 0
67 || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
68 || EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, hashlen) <= 0
69 || EVP_PKEY_CTX_add1_hkdf_info(pctx, hkdflabel, hkdflabellen) <= 0
70 || EVP_PKEY_derive(pctx, out, &outlen) <= 0;
71
72 EVP_PKEY_CTX_free(pctx);
73
74 return ret == 0;
75}
76
34574f19 77/*
f5ca0b04
MC		 78 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
79 * success 0 on failure.
34574f19 80 */
d49e23ec
MC		 81int tls13_derive_key(SSL *s, const EVP_MD *md, const unsigned char *secret,
82 unsigned char *key, size_t keylen)
34574f19 83{
f5ca0b04
MC		 84 static const unsigned char keylabel[] = "key";
85
d49e23ec 86 return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
a19ae67d 87 NULL, 0, key, keylen);
34574f19
MC		 88}
89
90/*
f5ca0b04
MC		 91 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
92 * success 0 on failure.
34574f19 93 */
d49e23ec
MC		 94int tls13_derive_iv(SSL *s, const EVP_MD *md, const unsigned char *secret,
95 unsigned char *iv, size_t ivlen)
34574f19 96{
f5ca0b04
MC		 97 static const unsigned char ivlabel[] = "iv";
98
d49e23ec 99 return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
a19ae67d 100 NULL, 0, iv, ivlen);
34574f19
MC		 101}
102
ec15acb6
MC		 103int tls13_derive_finishedkey(SSL *s, const EVP_MD *md,
104 const unsigned char *secret,
105 unsigned char *fin, size_t finlen)
6484776f 106{
f5ca0b04
MC		 107 static const unsigned char finishedlabel[] = "finished";
108
ec15acb6 109 return tls13_hkdf_expand(s, md, secret, finishedlabel,
a19ae67d 110 sizeof(finishedlabel) - 1, NULL, 0, fin, finlen);
6484776f
MC		 111}
112
34574f19
MC		 113/*
114 * Given the previous secret |prevsecret| and a new input secret |insecret| of
115 * length |insecretlen|, generate a new secret and store it in the location
f5ca0b04 116 * pointed to by |outsecret|. Returns 1 on success 0 on failure.
34574f19 117 */
ec15acb6
MC		 118int tls13_generate_secret(SSL *s, const EVP_MD *md,
119 const unsigned char *prevsecret,
120 const unsigned char *insecret,
121 size_t insecretlen,
122 unsigned char *outsecret)
34574f19 123{
34574f19
MC		 124 size_t mdlen, prevsecretlen;
125 int ret;
126 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
17aa119e 127 static const char derived_secret_label[] = "derived";
3e0458fb 128 unsigned char preextractsec[EVP_MAX_MD_SIZE];
34574f19
MC		 129
130 if (pctx == NULL)
131 return 0;
132
133 mdlen = EVP_MD_size(md);
134
135 if (insecret == NULL) {
136 insecret = default_zeros;
137 insecretlen = mdlen;
138 }
139 if (prevsecret == NULL) {
140 prevsecret = default_zeros;
141 prevsecretlen = 0;
142 } else {
3e0458fb
MC		 143 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
144 unsigned char hash[EVP_MAX_MD_SIZE];
145
146 /* The pre-extract derive step uses a hash of no messages */
147 if (mctx == NULL
148 || EVP_DigestInit_ex(mctx, md, NULL) <= 0
149 || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
150 EVP_MD_CTX_free(mctx);
71d8c138 151 EVP_PKEY_CTX_free(pctx);
3e0458fb
MC		 152 return 0;
153 }
154 EVP_MD_CTX_free(mctx);
155
156 /* Generate the pre-extract secret */
157 if (!tls13_hkdf_expand(s, md, prevsecret,
158 (unsigned char *)derived_secret_label,
a19ae67d 159 sizeof(derived_secret_label) - 1, hash, mdlen,
71d8c138
BE		 160 preextractsec, mdlen)) {
161 EVP_PKEY_CTX_free(pctx);
3e0458fb 162 return 0;
71d8c138 163 }
3e0458fb
MC		 164
165 prevsecret = preextractsec;
34574f19
MC		 166 prevsecretlen = mdlen;
167 }
168
169 ret = EVP_PKEY_derive_init(pctx) <= 0
170 || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY)
171 <= 0
172 || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
173 || EVP_PKEY_CTX_set1_hkdf_key(pctx, insecret, insecretlen) <= 0
174 || EVP_PKEY_CTX_set1_hkdf_salt(pctx, prevsecret, prevsecretlen)
175 <= 0
176 || EVP_PKEY_derive(pctx, outsecret, &mdlen)
177 <= 0;
178
179 EVP_PKEY_CTX_free(pctx);
3e0458fb
MC		 180 if (prevsecret == preextractsec)
181 OPENSSL_cleanse(preextractsec, mdlen);
34574f19
MC		 182 return ret == 0;
183}
184
34574f19
MC		 185/*
186 * Given an input secret |insecret| of length |insecretlen| generate the
187 * handshake secret. This requires the early secret to already have been
f5ca0b04 188 * generated. Returns 1 on success 0 on failure.
34574f19
MC		 189 */
190int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
191 size_t insecretlen)
192{
ec15acb6
MC		 193 return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
194 insecret, insecretlen,
34574f19
MC		 195 (unsigned char *)&s->handshake_secret);
196}
197
198/*
199 * Given the handshake secret |prev| of length |prevlen| generate the master
f5ca0b04
MC		 200 * secret and store its length in |*secret_size|. Returns 1 on success 0 on
201 * failure.
34574f19
MC		 202 */
203int tls13_generate_master_secret(SSL *s, unsigned char *out,
204 unsigned char *prev, size_t prevlen,
205 size_t *secret_size)
206{
ec15acb6
MC		 207 const EVP_MD *md = ssl_handshake_md(s);
208
209 *secret_size = EVP_MD_size(md);
210 return tls13_generate_secret(s, md, prev, NULL, 0, out);
34574f19
MC		 211}
212
92760c21 213/*
f5ca0b04
MC		 214 * Generates the mac for the Finished message. Returns the length of the MAC or
215 * 0 on error.
92760c21
MC		 216 */
217size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
218 unsigned char *out)
219{
6484776f
MC		 220 const EVP_MD *md = ssl_handshake_md(s);
221 unsigned char hash[EVP_MAX_MD_SIZE];
222 size_t hashlen, ret = 0;
223 EVP_PKEY *key = NULL;
224 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
92760c21 225
6484776f
MC		 226 if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
227 goto err;
228
229 if (str == s->method->ssl3_enc->server_finished_label)
230 key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
231 s->server_finished_secret, hashlen);
232 else
233 key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
234 s->client_finished_secret, hashlen);
235
236 if (key == NULL
237 || ctx == NULL
238 || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
239 || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
240 || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0)
241 goto err;
92760c21 242
6484776f
MC		 243 ret = hashlen;
244 err:
245 EVP_PKEY_free(key);
246 EVP_MD_CTX_free(ctx);
247 return ret;
92760c21
MC		 248}
249
250/*
251 * There isn't really a key block in TLSv1.3, but we still need this function
f5ca0b04 252 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
92760c21
MC		 253 */
254int tls13_setup_key_block(SSL *s)
255{
256 const EVP_CIPHER *c;
257 const EVP_MD *hash;
258 int mac_type = NID_undef;
259
260 s->session->cipher = s->s3->tmp.new_cipher;
261 if (!ssl_cipher_get_evp
262 (s->session, &c, &hash, &mac_type, NULL, NULL, 0)) {
263 SSLerr(SSL_F_TLS13_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
264 return 0;
265 }
266
267 s->s3->tmp.new_sym_enc = c;
268 s->s3->tmp.new_hash = hash;
269
270 return 1;
271}
272
d1186c30 273static int derive_secret_key_and_iv(SSL *s, int sending, const EVP_MD *md,
d49e23ec 274 const EVP_CIPHER *ciph,
57389a32
MC		 275 const unsigned char *insecret,
276 const unsigned char *hash,
277 const unsigned char *label,
278 size_t labellen, unsigned char *secret,
279 unsigned char *iv, EVP_CIPHER_CTX *ciph_ctx)
280{
281 unsigned char key[EVP_MAX_KEY_LENGTH];
282 size_t ivlen, keylen, taglen;
57389a32 283 size_t hashlen = EVP_MD_size(md);
57389a32 284
a19ae67d
MC		 285 if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
286 secret, hashlen)) {
57389a32
MC		 287 SSLerr(SSL_F_DERIVE_SECRET_KEY_AND_IV, ERR_R_INTERNAL_ERROR);
288 goto err;
289 }
290
291 /* TODO(size_t): convert me */
292 keylen = EVP_CIPHER_key_length(ciph);
293 if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
c117af67
MC		 294 uint32_t algenc;
295
57389a32 296 ivlen = EVP_CCM_TLS_IV_LEN;
c117af67
MC		 297 if (s->s3->tmp.new_cipher == NULL) {
298 /* We've not selected a cipher yet - we must be doing early data */
299 algenc = s->session->cipher->algorithm_enc;
300 } else {
301 algenc = s->s3->tmp.new_cipher->algorithm_enc;
302 }
303 if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
57389a32
MC		 304 taglen = EVP_CCM8_TLS_TAG_LEN;
305 else
306 taglen = EVP_CCM_TLS_TAG_LEN;
307 } else {
308 ivlen = EVP_CIPHER_iv_length(ciph);
309 taglen = 0;
310 }
311
d49e23ec
MC		 312 if (!tls13_derive_key(s, md, secret, key, keylen)
313 || !tls13_derive_iv(s, md, secret, iv, ivlen)) {
57389a32
MC		 314 SSLerr(SSL_F_DERIVE_SECRET_KEY_AND_IV, ERR_R_INTERNAL_ERROR);
315 goto err;
316 }
317
d1186c30 318 if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
57389a32
MC		 319 || !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
320 || (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
321 taglen, NULL))
322 || EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
323 SSLerr(SSL_F_DERIVE_SECRET_KEY_AND_IV, ERR_R_EVP_LIB);
324 goto err;
325 }
326
57389a32
MC		 327 return 1;
328 err:
329 OPENSSL_cleanse(key, sizeof(key));
330 return 0;
331}
332
0d9824c1
MC		 333int tls13_change_cipher_state(SSL *s, int which)
334{
17aa119e
MC		 335 static const unsigned char client_early_traffic[] = "c e traffic";
336 static const unsigned char client_handshake_traffic[] = "c hs traffic";
337 static const unsigned char client_application_traffic[] = "c ap traffic";
338 static const unsigned char server_handshake_traffic[] = "s hs traffic";
339 static const unsigned char server_application_traffic[] = "s ap traffic";
0ca8d1ec 340 static const unsigned char exporter_master_secret[] = "exp master";
17aa119e 341 static const unsigned char resumption_master_secret[] = "res master";
bebc0c7d 342 unsigned char *iv;
0d9824c1 343 unsigned char secret[EVP_MAX_MD_SIZE];
ace081c1
MC		 344 unsigned char hashval[EVP_MAX_MD_SIZE];
345 unsigned char *hash = hashval;
0d9824c1 346 unsigned char *insecret;
6484776f 347 unsigned char *finsecret = NULL;
2c7bd692 348 const char *log_label = NULL;
0d9824c1 349 EVP_CIPHER_CTX *ciph_ctx;
57389a32 350 size_t finsecretlen = 0;
0d9824c1 351 const unsigned char *label;
ace081c1 352 size_t labellen, hashlen = 0;
6530c490 353 int ret = 0;
42f50fdf
MC		 354 const EVP_MD *md = NULL;
355 const EVP_CIPHER *cipher = NULL;
0d9824c1
MC		 356
357 if (which & SSL3_CC_READ) {
358 if (s->enc_read_ctx != NULL) {
359 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
360 } else {
361 s->enc_read_ctx = EVP_CIPHER_CTX_new();
362 if (s->enc_read_ctx == NULL) {
363 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
364 goto err;
365 }
366 }
367 ciph_ctx = s->enc_read_ctx;
bebc0c7d 368 iv = s->read_iv;
0d9824c1
MC		 369
370 RECORD_LAYER_reset_read_sequence(&s->rlayer);
371 } else {
372 if (s->enc_write_ctx != NULL) {
373 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
374 } else {
375 s->enc_write_ctx = EVP_CIPHER_CTX_new();
376 if (s->enc_write_ctx == NULL) {
377 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
378 goto err;
379 }
380 }
381 ciph_ctx = s->enc_write_ctx;
bebc0c7d 382 iv = s->write_iv;
0d9824c1
MC		 383
384 RECORD_LAYER_reset_write_sequence(&s->rlayer);
385 }
386
387 if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
388 || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
d49e23ec
MC		 389 if (which & SSL3_CC_EARLY) {
390 EVP_MD_CTX *mdctx = NULL;
391 long handlen;
392 void *hdata;
393 unsigned int hashlenui;
394 const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
395
396 insecret = s->early_secret;
397 label = client_early_traffic;
398 labellen = sizeof(client_early_traffic) - 1;
399 log_label = CLIENT_EARLY_LABEL;
400
401 handlen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
402 if (handlen <= 0) {
403 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE,
404 SSL_R_BAD_HANDSHAKE_LENGTH);
405 goto err;
406 }
407 if (sslcipher == NULL) {
408 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
409 goto err;
410 }
411
412 /*
413 * We need to calculate the handshake digest using the digest from
414 * the session. We haven't yet selected our ciphersuite so we can't
415 * use ssl_handshake_md().
416 */
417 mdctx = EVP_MD_CTX_new();
418 if (mdctx == NULL) {
419 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
420 goto err;
421 }
422 cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
423 md = ssl_md(sslcipher->algorithm2);
424 if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
425 || !EVP_DigestUpdate(mdctx, hdata, handlen)
426 || !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
427 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
428 EVP_MD_CTX_free(mdctx);
429 goto err;
430 }
431 hashlen = hashlenui;
432 EVP_MD_CTX_free(mdctx);
433 } else if (which & SSL3_CC_HANDSHAKE) {
0d9824c1 434 insecret = s->handshake_secret;
6484776f 435 finsecret = s->client_finished_secret;
6612d87b 436 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 437 label = client_handshake_traffic;
438 labellen = sizeof(client_handshake_traffic) - 1;
2c7bd692 439 log_label = CLIENT_HANDSHAKE_LABEL;
fe5e20fd 440 /*
69687aa8 441 * The handshake hash used for the server read/client write handshake
f7e393be
MC		 442 * traffic secret is the same as the hash for the server
443 * write/client read handshake traffic secret. However, if we
444 * processed early data then we delay changing the server
445 * read/client write cipher state until later, and the handshake
446 * hashes have moved on. Therefore we use the value saved earlier
447 * when we did the server write/client read change cipher state.
fe5e20fd 448 */
f7e393be 449 hash = s->handshake_traffic_hash;
0d9824c1 450 } else {
ec15acb6 451 insecret = s->master_secret;
0d9824c1
MC		 452 label = client_application_traffic;
453 labellen = sizeof(client_application_traffic) - 1;
2c7bd692 454 log_label = CLIENT_APPLICATION_LABEL;
ace081c1
MC		 455 /*
456 * For this we only use the handshake hashes up until the server
457 * Finished hash. We do not include the client's Finished, which is
458 * what ssl_handshake_hash() would give us. Instead we use the
459 * previously saved value.
460 */
461 hash = s->server_finished_hash;
0d9824c1
MC		 462 }
463 } else {
d49e23ec 464 /* Early data never applies to client-read/server-write */
0d9824c1
MC		 465 if (which & SSL3_CC_HANDSHAKE) {
466 insecret = s->handshake_secret;
6484776f 467 finsecret = s->server_finished_secret;
6612d87b 468 finsecretlen = EVP_MD_size(ssl_handshake_md(s));
0d9824c1
MC		 469 label = server_handshake_traffic;
470 labellen = sizeof(server_handshake_traffic) - 1;
2c7bd692 471 log_label = SERVER_HANDSHAKE_LABEL;
0d9824c1 472 } else {
ec15acb6 473 insecret = s->master_secret;
0d9824c1
MC		 474 label = server_application_traffic;
475 labellen = sizeof(server_application_traffic) - 1;
2c7bd692 476 log_label = SERVER_APPLICATION_LABEL;
0d9824c1
MC		 477 }
478 }
479
d49e23ec
MC		 480 if (!(which & SSL3_CC_EARLY)) {
481 md = ssl_handshake_md(s);
482 cipher = s->s3->tmp.new_sym_enc;
483 if (!ssl3_digest_cached_records(s, 1)
484 || !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
485 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
486 goto err;
487 }
ace081c1
MC		 488 }
489
ec15acb6
MC		 490 /*
491 * Save the hash of handshakes up to now for use when we calculate the
492 * client application traffic secret
493 */
494 if (label == server_application_traffic)
495 memcpy(s->server_finished_hash, hashval, hashlen);
496
f7e393be 497 if (label == server_handshake_traffic)
fe5e20fd
MC		 498 memcpy(s->handshake_traffic_hash, hashval, hashlen);
499
ec15acb6
MC		 500 if (label == client_application_traffic) {
501 /*
502 * We also create the resumption master secret, but this time use the
503 * hash for the whole handshake including the Client Finished
504 */
505 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
506 resumption_master_secret,
507 sizeof(resumption_master_secret) - 1,
a19ae67d
MC		 508 hashval, hashlen, s->session->master_key,
509 hashlen)) {
ec15acb6
MC		 510 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
511 goto err;
512 }
513 s->session->master_key_length = hashlen;
0ca8d1ec
MC		 514
515 /* Now we create the exporter master secret */
516 if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
517 exporter_master_secret,
518 sizeof(exporter_master_secret) - 1,
a19ae67d
MC		 519 hash, hashlen, s->exporter_master_secret,
520 hashlen)) {
0ca8d1ec
MC		 521 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
522 goto err;
523 }
ec15acb6
MC		 524 }
525
d49e23ec
MC		 526 if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
527 insecret, hash, label, labellen, secret, iv,
528 ciph_ctx)) {
57389a32 529 goto err;
ec07b1d8 530 }
0d9824c1 531
57389a32
MC		 532 if (label == server_application_traffic)
533 memcpy(s->server_app_traffic_secret, secret, hashlen);
534 else if (label == client_application_traffic)
535 memcpy(s->client_app_traffic_secret, secret, hashlen);
536
2c7bd692
CB		 537 if (!ssl_log_secret(s, log_label, secret, hashlen)) {
538 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
539 goto err;
540 }
541
57389a32
MC		 542 if (finsecret != NULL
543 && !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
544 finsecret, finsecretlen)) {
0d9824c1
MC		 545 SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
546 goto err;
547 }
548
57389a32
MC		 549 ret = 1;
550 err:
551 OPENSSL_cleanse(secret, sizeof(secret));
552 return ret;
553}
0d9824c1 554
d1186c30 555int tls13_update_key(SSL *s, int sending)
57389a32 556{
17aa119e 557 static const unsigned char application_traffic[] = "traffic upd";
57389a32
MC		 558 const EVP_MD *md = ssl_handshake_md(s);
559 size_t hashlen = EVP_MD_size(md);
560 unsigned char *insecret, *iv;
561 unsigned char secret[EVP_MAX_MD_SIZE];
562 EVP_CIPHER_CTX *ciph_ctx;
563 int ret = 0;
0d9824c1 564
d1186c30 565 if (s->server == sending)
57389a32
MC		 566 insecret = s->server_app_traffic_secret;
567 else
568 insecret = s->client_app_traffic_secret;
bebc0c7d 569
d1186c30 570 if (sending) {
57389a32
MC		 571 iv = s->write_iv;
572 ciph_ctx = s->enc_write_ctx;
573 RECORD_LAYER_reset_write_sequence(&s->rlayer);
574 } else {
575 iv = s->read_iv;
576 ciph_ctx = s->enc_read_ctx;
577 RECORD_LAYER_reset_read_sequence(&s->rlayer);
0d9824c1 578 }
57389a32 579
d1186c30 580 if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
d49e23ec
MC		 581 s->s3->tmp.new_sym_enc, insecret, NULL,
582 application_traffic,
57389a32
MC		 583 sizeof(application_traffic) - 1, secret, iv,
584 ciph_ctx))
585 goto err;
586
587 memcpy(insecret, secret, hashlen);
0d9824c1 588
6530c490 589 ret = 1;
0d9824c1
MC		 590 err:
591 OPENSSL_cleanse(secret, sizeof(secret));
6530c490 592 return ret;
0d9824c1 593}
04904312
MC		 594
595int tls13_alert_code(int code)
596{
ef6c191b 597 if (code == SSL_AD_MISSING_EXTENSION)
04904312
MC		 598 return code;
599
600 return tls1_alert_code(code);
601}
0ca8d1ec
MC		 602
603int tls13_export_keying_material(SSL *s, unsigned char *out, size_t olen,
604 const char *label, size_t llen,
605 const unsigned char *context,
606 size_t contextlen, int use_context)
607{
608 unsigned char exportsecret[EVP_MAX_MD_SIZE];
609 static const unsigned char exporterlabel[] = "exporter";
c8b93876 610 unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
0ca8d1ec
MC		 611 const EVP_MD *md = ssl_handshake_md(s);
612 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
c8b93876 613 unsigned int hashsize, datalen;
0ca8d1ec
MC		 614 int ret = 0;
615
a599574b 616 if (ctx == NULL || !SSL_is_init_finished(s))
0ca8d1ec
MC		 617 goto err;
618
619 if (!use_context)
620 contextlen = 0;
621
622 if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
623 || EVP_DigestUpdate(ctx, context, contextlen) <= 0
624 || EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
c8b93876
TT		 625 || EVP_DigestInit_ex(ctx, md, NULL) <= 0
626 || EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
0ca8d1ec 627 || !tls13_hkdf_expand(s, md, s->exporter_master_secret,
c8b93876
TT		 628 (const unsigned char *)label, llen,
629 data, datalen, exportsecret, hashsize)
0ca8d1ec 630 || !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
a19ae67d
MC		 631 sizeof(exporterlabel) - 1, hash, hashsize,
632 out, olen))
0ca8d1ec
MC		 633 goto err;
634
635 ret = 1;
636 err:
637 EVP_MD_CTX_free(ctx);
638 return ret;
639}
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