1 /*
2 * DPP configurator backup
3 * Copyright (c) 2019-2020, The Linux Foundation
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "crypto/aes.h"
13 #include "crypto/aes_siv.h"
14 #include "tls/asn1.h"
15 #include "dpp.h"
16 #include "dpp_i.h"
17
18 #ifdef CONFIG_DPP2
19
dpp_free_asymmetric_key(struct dpp_asymmetric_key * key)20 void dpp_free_asymmetric_key(struct dpp_asymmetric_key *key)
21 {
22 while (key) {
23 struct dpp_asymmetric_key *next = key->next;
24
25 crypto_ec_key_deinit(key->csign);
26 crypto_ec_key_deinit(key->pp_key);
27 str_clear_free(key->config_template);
28 str_clear_free(key->connector_template);
29 os_free(key);
30 key = next;
31 }
32 }
33
34
dpp_build_conf_params(struct dpp_configurator * conf)35 static struct wpabuf * dpp_build_conf_params(struct dpp_configurator *conf)
36 {
37 struct wpabuf *buf, *priv_key = NULL;
38 size_t len;
39 /* TODO: proper template values */
40 const char *conf_template = "{\"wi-fi_tech\":\"infra\",\"discovery\":{\"ssid\":\"test\"},\"cred\":{\"akm\":\"dpp\"}}";
41 const char *connector_template = NULL;
42
43 if (!conf->pp_key)
44 return NULL;
45
46 priv_key = crypto_ec_key_get_ecprivate_key(conf->pp_key, false);
47 if (!priv_key)
48 return NULL;
49
50 len = 100 + os_strlen(conf_template);
51 if (connector_template)
52 len += os_strlen(connector_template);
53 if (priv_key)
54 len += wpabuf_len(priv_key);
55 buf = wpabuf_alloc(len);
56 if (!buf)
57 goto fail;
58
59 /*
60 * DPPConfigurationParameters ::= SEQUENCE {
61 * privacyProtectionKey PrivateKey,
62 * configurationTemplate UTF8String,
63 * connectorTemplate UTF8String OPTIONAL}
64 */
65
66 /* PrivateKey ::= OCTET STRING */
67 asn1_put_octet_string(buf, priv_key);
68
69 asn1_put_utf8string(buf, conf_template);
70 if (connector_template)
71 asn1_put_utf8string(buf, connector_template);
72 wpabuf_clear_free(priv_key);
73 return asn1_encaps(buf, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
74 fail:
75 wpabuf_clear_free(priv_key);
76 return NULL;
77 }
78
79
dpp_build_attribute(struct dpp_configurator * conf)80 static struct wpabuf * dpp_build_attribute(struct dpp_configurator *conf)
81 {
82 struct wpabuf *conf_params, *attr;
83
84 /*
85 * aa-DPPConfigurationParameters ATTRIBUTE ::=
86 * { TYPE DPPConfigurationParameters IDENTIFIED BY id-DPPConfigParams }
87 *
88 * Attribute ::= SEQUENCE {
89 * type OBJECT IDENTIFIER,
90 * values SET SIZE(1..MAX) OF Type
91 */
92 conf_params = dpp_build_conf_params(conf);
93 conf_params = asn1_encaps(conf_params, ASN1_CLASS_UNIVERSAL,
94 ASN1_TAG_SET);
95 if (!conf_params)
96 return NULL;
97
98 attr = wpabuf_alloc(100 + wpabuf_len(conf_params));
99 if (!attr) {
100 wpabuf_clear_free(conf_params);
101 return NULL;
102 }
103
104 asn1_put_oid(attr, &asn1_dpp_config_params_oid);
105 wpabuf_put_buf(attr, conf_params);
106 wpabuf_clear_free(conf_params);
107
108 return asn1_encaps(attr, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
109 }
110
111
dpp_build_key_alg(const struct dpp_curve_params * curve)112 static struct wpabuf * dpp_build_key_alg(const struct dpp_curve_params *curve)
113 {
114 const struct asn1_oid *oid;
115 struct wpabuf *params, *res;
116
117 switch (curve->ike_group) {
118 case 19:
119 oid = &asn1_prime256v1_oid;
120 break;
121 case 20:
122 oid = &asn1_secp384r1_oid;
123 break;
124 case 21:
125 oid = &asn1_secp521r1_oid;
126 break;
127 case 28:
128 oid = &asn1_brainpoolP256r1_oid;
129 break;
130 case 29:
131 oid = &asn1_brainpoolP384r1_oid;
132 break;
133 case 30:
134 oid = &asn1_brainpoolP512r1_oid;
135 break;
136 default:
137 return NULL;
138 }
139
140 params = wpabuf_alloc(20);
141 if (!params)
142 return NULL;
143 asn1_put_oid(params, oid); /* namedCurve */
144
145 res = asn1_build_alg_id(&asn1_ec_public_key_oid, params);
146 wpabuf_free(params);
147 return res;
148 }
149
150
dpp_build_key_pkg(struct dpp_authentication * auth)151 static struct wpabuf * dpp_build_key_pkg(struct dpp_authentication *auth)
152 {
153 struct wpabuf *key = NULL, *attr, *alg, *priv_key = NULL;
154
155 priv_key = crypto_ec_key_get_ecprivate_key(auth->conf->csign, false);
156 if (!priv_key)
157 return NULL;
158
159 alg = dpp_build_key_alg(auth->conf->curve);
160
161 /* Attributes ::= SET OF Attribute { { OneAsymmetricKeyAttributes } } */
162 attr = dpp_build_attribute(auth->conf);
163 attr = asn1_encaps(attr, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SET);
164 if (!priv_key || !attr || !alg)
165 goto fail;
166
167 /*
168 * OneAsymmetricKey ::= SEQUENCE {
169 * version Version,
170 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
171 * privateKey PrivateKey,
172 * attributes [0] Attributes OPTIONAL,
173 * ...,
174 * [[2: publicKey [1] BIT STRING OPTIONAL ]],
175 * ...
176 * }
177 */
178
179 key = wpabuf_alloc(100 + wpabuf_len(alg) + wpabuf_len(priv_key) +
180 wpabuf_len(attr));
181 if (!key)
182 goto fail;
183
184 asn1_put_integer(key, 0); /* version = v1(0) */
185
186 /* PrivateKeyAlgorithmIdentifier */
187 wpabuf_put_buf(key, alg);
188
189 /* PrivateKey ::= OCTET STRING */
190 asn1_put_octet_string(key, priv_key);
191
192 /* [0] Attributes OPTIONAL */
193 asn1_put_hdr(key, ASN1_CLASS_CONTEXT_SPECIFIC, 1, 0, wpabuf_len(attr));
194 wpabuf_put_buf(key, attr);
195
196 fail:
197 wpabuf_clear_free(attr);
198 wpabuf_clear_free(priv_key);
199 wpabuf_free(alg);
200
201 /*
202 * DPPAsymmetricKeyPackage ::= AsymmetricKeyPackage
203 *
204 * AsymmetricKeyPackage ::= SEQUENCE SIZE (1..MAX) OF OneAsymmetricKey
205 *
206 * OneAsymmetricKey ::= SEQUENCE
207 */
208 return asn1_encaps(asn1_encaps(key,
209 ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE),
210 ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
211 }
212
213
dpp_build_pbkdf2_alg_id(const struct wpabuf * salt,size_t hash_len)214 static struct wpabuf * dpp_build_pbkdf2_alg_id(const struct wpabuf *salt,
215 size_t hash_len)
216 {
217 struct wpabuf *params = NULL, *buf = NULL, *prf = NULL;
218 const struct asn1_oid *oid;
219
220 /*
221 * PBKDF2-params ::= SEQUENCE {
222 * salt CHOICE {
223 * specified OCTET STRING,
224 * otherSource AlgorithmIdentifier}
225 * iterationCount INTEGER (1..MAX),
226 * keyLength INTEGER (1..MAX),
227 * prf AlgorithmIdentifier}
228 *
229 * salt is an 64 octet value, iterationCount is 1000, keyLength is based
230 * on Configurator signing key length, prf is
231 * id-hmacWithSHA{256,384,512} based on Configurator signing key.
232 */
233
234 if (hash_len == 32)
235 oid = &asn1_pbkdf2_hmac_sha256_oid;
236 else if (hash_len == 48)
237 oid = &asn1_pbkdf2_hmac_sha384_oid;
238 else if (hash_len == 64)
239 oid = &asn1_pbkdf2_hmac_sha512_oid;
240 else
241 goto fail;
242 prf = asn1_build_alg_id(oid, NULL);
243 if (!prf)
244 goto fail;
245 params = wpabuf_alloc(100 + wpabuf_len(salt) + wpabuf_len(prf));
246 if (!params)
247 goto fail;
248 asn1_put_octet_string(params, salt); /* salt.specified */
249 asn1_put_integer(params, 1000); /* iterationCount */
250 asn1_put_integer(params, hash_len); /* keyLength */
251 wpabuf_put_buf(params, prf);
252 params = asn1_encaps(params, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
253 if (!params)
254 goto fail;
255 buf = asn1_build_alg_id(&asn1_pbkdf2_oid, params);
256 fail:
257 wpabuf_free(params);
258 wpabuf_free(prf);
259 return buf;
260 }
261
262
263 static struct wpabuf *
dpp_build_pw_recipient_info(struct dpp_authentication * auth,size_t hash_len,const struct wpabuf * cont_enc_key)264 dpp_build_pw_recipient_info(struct dpp_authentication *auth, size_t hash_len,
265 const struct wpabuf *cont_enc_key)
266 {
267 struct wpabuf *pwri = NULL, *enc_key = NULL, *key_der_alg = NULL,
268 *key_enc_alg = NULL, *salt;
269 u8 kek[DPP_MAX_HASH_LEN];
270 u8 key[DPP_MAX_HASH_LEN];
271 size_t key_len;
272 int res;
273
274 salt = wpabuf_alloc(64);
275 if (!salt || os_get_random(wpabuf_put(salt, 64), 64) < 0)
276 goto fail;
277 wpa_hexdump_buf(MSG_DEBUG, "DPP: PBKDF2 salt", salt);
278
279 key_len = auth->curve->hash_len;
280 /* password = HKDF-Expand(bk, "Enveloped Data Password", length) */
281 res = dpp_hkdf_expand(key_len, auth->bk, key_len,
282 "Enveloped Data Password", key, key_len);
283 if (res < 0)
284 goto fail;
285 wpa_hexdump_key(MSG_DEBUG, "DPP: PBKDF2 key", key, key_len);
286
287 if (dpp_pbkdf2(hash_len, key, key_len, wpabuf_head(salt), 64, 1000,
288 kek, hash_len)) {
289 wpa_printf(MSG_DEBUG, "DPP: PBKDF2 failed");
290 goto fail;
291 }
292 wpa_hexdump_key(MSG_DEBUG, "DPP: key-encryption key from PBKDF2",
293 kek, hash_len);
294
295 enc_key = wpabuf_alloc(hash_len + AES_BLOCK_SIZE);
296 if (!enc_key ||
297 aes_siv_encrypt(kek, hash_len, wpabuf_head(cont_enc_key),
298 wpabuf_len(cont_enc_key), 0, NULL, NULL,
299 wpabuf_put(enc_key, hash_len + AES_BLOCK_SIZE)) < 0)
300 goto fail;
301 wpa_hexdump_buf(MSG_DEBUG, "DPP: encryptedKey", enc_key);
302
303 /*
304 * PasswordRecipientInfo ::= SEQUENCE {
305 * version CMSVersion,
306 * keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier OPTIONAL,
307 * keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
308 * encryptedKey EncryptedKey}
309 *
310 * version is 0, keyDerivationAlgorithm is id-PKBDF2, and the
311 * parameters contains PBKDF2-params SEQUENCE.
312 */
313
314 key_der_alg = dpp_build_pbkdf2_alg_id(salt, hash_len);
315 key_enc_alg = asn1_build_alg_id(&asn1_aes_siv_cmac_aead_256_oid, NULL);
316 if (!key_der_alg || !key_enc_alg)
317 goto fail;
318 pwri = wpabuf_alloc(100 + wpabuf_len(key_der_alg) +
319 wpabuf_len(key_enc_alg) + wpabuf_len(enc_key));
320 if (!pwri)
321 goto fail;
322
323 /* version = 0 */
324 asn1_put_integer(pwri, 0);
325
326 /* [0] KeyDerivationAlgorithmIdentifier */
327 asn1_put_hdr(pwri, ASN1_CLASS_CONTEXT_SPECIFIC, 1, 0,
328 wpabuf_len(key_der_alg));
329 wpabuf_put_buf(pwri, key_der_alg);
330
331 /* KeyEncryptionAlgorithmIdentifier */
332 wpabuf_put_buf(pwri, key_enc_alg);
333
334 /* EncryptedKey ::= OCTET STRING */
335 asn1_put_octet_string(pwri, enc_key);
336
337 fail:
338 wpabuf_clear_free(key_der_alg);
339 wpabuf_free(key_enc_alg);
340 wpabuf_free(enc_key);
341 wpabuf_free(salt);
342 forced_memzero(kek, sizeof(kek));
343 return asn1_encaps(pwri, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
344 }
345
346
347 static struct wpabuf *
dpp_build_recipient_info(struct dpp_authentication * auth,size_t hash_len,const struct wpabuf * cont_enc_key)348 dpp_build_recipient_info(struct dpp_authentication *auth, size_t hash_len,
349 const struct wpabuf *cont_enc_key)
350 {
351 struct wpabuf *pwri;
352
353 /*
354 * RecipientInfo ::= CHOICE {
355 * ktri KeyTransRecipientInfo,
356 * kari [1] KeyAgreeRecipientInfo,
357 * kekri [2] KEKRecipientInfo,
358 * pwri [3] PasswordRecipientInfo,
359 * ori [4] OtherRecipientInfo}
360 *
361 * Shall always use the pwri CHOICE.
362 */
363
364 pwri = dpp_build_pw_recipient_info(auth, hash_len, cont_enc_key);
365 return asn1_encaps(pwri, ASN1_CLASS_CONTEXT_SPECIFIC, 3);
366 }
367
368
369 static struct wpabuf *
dpp_build_enc_cont_info(struct dpp_authentication * auth,size_t hash_len,const struct wpabuf * cont_enc_key)370 dpp_build_enc_cont_info(struct dpp_authentication *auth, size_t hash_len,
371 const struct wpabuf *cont_enc_key)
372 {
373 struct wpabuf *key_pkg, *enc_cont_info = NULL, *enc_cont = NULL,
374 *enc_alg;
375 const struct asn1_oid *oid;
376 size_t enc_cont_len;
377
378 /*
379 * EncryptedContentInfo ::= SEQUENCE {
380 * contentType ContentType,
381 * contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
382 * encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL}
383 */
384
385 if (hash_len == 32)
386 oid = &asn1_aes_siv_cmac_aead_256_oid;
387 else if (hash_len == 48)
388 oid = &asn1_aes_siv_cmac_aead_384_oid;
389 else if (hash_len == 64)
390 oid = &asn1_aes_siv_cmac_aead_512_oid;
391 else
392 return NULL;
393
394 key_pkg = dpp_build_key_pkg(auth);
395 enc_alg = asn1_build_alg_id(oid, NULL);
396 if (!key_pkg || !enc_alg)
397 goto fail;
398
399 wpa_hexdump_buf_key(MSG_MSGDUMP, "DPP: DPPAsymmetricKeyPackage",
400 key_pkg);
401
402 enc_cont_len = wpabuf_len(key_pkg) + AES_BLOCK_SIZE;
403 enc_cont = wpabuf_alloc(enc_cont_len);
404 if (!enc_cont ||
405 aes_siv_encrypt(wpabuf_head(cont_enc_key), wpabuf_len(cont_enc_key),
406 wpabuf_head(key_pkg), wpabuf_len(key_pkg),
407 0, NULL, NULL,
408 wpabuf_put(enc_cont, enc_cont_len)) < 0)
409 goto fail;
410
411 enc_cont_info = wpabuf_alloc(100 + wpabuf_len(enc_alg) +
412 wpabuf_len(enc_cont));
413 if (!enc_cont_info)
414 goto fail;
415
416 /* ContentType ::= OBJECT IDENTIFIER */
417 asn1_put_oid(enc_cont_info, &asn1_dpp_asymmetric_key_package_oid);
418
419 /* ContentEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier */
420 wpabuf_put_buf(enc_cont_info, enc_alg);
421
422 /* encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL
423 * EncryptedContent ::= OCTET STRING */
424 asn1_put_hdr(enc_cont_info, ASN1_CLASS_CONTEXT_SPECIFIC, 0, 0,
425 wpabuf_len(enc_cont));
426 wpabuf_put_buf(enc_cont_info, enc_cont);
427
428 fail:
429 wpabuf_clear_free(key_pkg);
430 wpabuf_free(enc_cont);
431 wpabuf_free(enc_alg);
432 return enc_cont_info;
433 }
434
435
dpp_gen_random(size_t len)436 static struct wpabuf * dpp_gen_random(size_t len)
437 {
438 struct wpabuf *key;
439
440 key = wpabuf_alloc(len);
441 if (!key || os_get_random(wpabuf_put(key, len), len) < 0) {
442 wpabuf_free(key);
443 key = NULL;
444 }
445 wpa_hexdump_buf_key(MSG_DEBUG, "DPP: content-encryption key", key);
446 return key;
447 }
448
449
dpp_build_enveloped_data(struct dpp_authentication * auth)450 struct wpabuf * dpp_build_enveloped_data(struct dpp_authentication *auth)
451 {
452 struct wpabuf *env = NULL;
453 struct wpabuf *recipient_info = NULL, *enc_cont_info = NULL;
454 struct wpabuf *cont_enc_key = NULL;
455 size_t hash_len;
456
457 if (!auth->conf) {
458 wpa_printf(MSG_DEBUG,
459 "DPP: No Configurator instance selected for the session - cannot build DPPEnvelopedData");
460 return NULL;
461 }
462
463 if (!auth->provision_configurator) {
464 wpa_printf(MSG_DEBUG,
465 "DPP: Configurator provisioning not allowed");
466 return NULL;
467 }
468
469 wpa_printf(MSG_DEBUG, "DPP: Building DPPEnvelopedData");
470
471 hash_len = auth->conf->curve->hash_len;
472 cont_enc_key = dpp_gen_random(hash_len);
473 if (!cont_enc_key)
474 goto fail;
475 recipient_info = dpp_build_recipient_info(auth, hash_len, cont_enc_key);
476 enc_cont_info = dpp_build_enc_cont_info(auth, hash_len, cont_enc_key);
477 if (!recipient_info || !enc_cont_info)
478 goto fail;
479
480 env = wpabuf_alloc(wpabuf_len(recipient_info) +
481 wpabuf_len(enc_cont_info) +
482 100);
483 if (!env)
484 goto fail;
485
486 /*
487 * DPPEnvelopedData ::= EnvelopedData
488 *
489 * EnvelopedData ::= SEQUENCE {
490 * version CMSVersion,
491 * originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
492 * recipientInfos RecipientInfos,
493 * encryptedContentInfo EncryptedContentInfo,
494 * unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL}
495 *
496 * For DPP, version is 3, both originatorInfo and
497 * unprotectedAttrs are omitted, and recipientInfos contains a single
498 * RecipientInfo.
499 */
500
501 /* EnvelopedData.version = 3 */
502 asn1_put_integer(env, 3);
503
504 /* RecipientInfos ::= SET SIZE (1..MAX) OF RecipientInfo */
505 asn1_put_set(env, recipient_info);
506
507 /* EncryptedContentInfo ::= SEQUENCE */
508 asn1_put_sequence(env, enc_cont_info);
509
510 env = asn1_encaps(env, ASN1_CLASS_UNIVERSAL, ASN1_TAG_SEQUENCE);
511 wpa_hexdump_buf(MSG_MSGDUMP, "DPP: DPPEnvelopedData", env);
512 out:
513 wpabuf_clear_free(cont_enc_key);
514 wpabuf_clear_free(recipient_info);
515 wpabuf_free(enc_cont_info);
516 return env;
517 fail:
518 wpabuf_free(env);
519 env = NULL;
520 goto out;
521 }
522
523
524 struct dpp_enveloped_data {
525 const u8 *enc_cont;
526 size_t enc_cont_len;
527 const u8 *enc_key;
528 size_t enc_key_len;
529 const u8 *salt;
530 size_t pbkdf2_key_len;
531 size_t prf_hash_len;
532 };
533
534
dpp_parse_recipient_infos(const u8 * pos,size_t len,struct dpp_enveloped_data * data)535 static int dpp_parse_recipient_infos(const u8 *pos, size_t len,
536 struct dpp_enveloped_data *data)
537 {
538 struct asn1_hdr hdr;
539 const u8 *end = pos + len;
540 const u8 *next, *e_end;
541 struct asn1_oid oid;
542 int val;
543 const u8 *params;
544 size_t params_len;
545
546 wpa_hexdump(MSG_MSGDUMP, "DPP: RecipientInfos", pos, len);
547
548 /*
549 * RecipientInfo ::= CHOICE {
550 * ktri KeyTransRecipientInfo,
551 * kari [1] KeyAgreeRecipientInfo,
552 * kekri [2] KEKRecipientInfo,
553 * pwri [3] PasswordRecipientInfo,
554 * ori [4] OtherRecipientInfo}
555 *
556 * Shall always use the pwri CHOICE.
557 */
558
559 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !hdr.constructed ||
560 !asn1_is_cs_tag(&hdr, 3)) {
561 asn1_unexpected(&hdr, "DPP: Expected CHOICE [3] (pwri)");
562 return -1;
563 }
564 wpa_hexdump(MSG_MSGDUMP, "DPP: PasswordRecipientInfo",
565 hdr.payload, hdr.length);
566 pos = hdr.payload;
567 end = pos + hdr.length;
568
569 /*
570 * PasswordRecipientInfo ::= SEQUENCE {
571 * version CMSVersion,
572 * keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier OPTIONAL,
573 * keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
574 * encryptedKey EncryptedKey}
575 *
576 * version is 0, keyDerivationAlgorithm is id-PKBDF2, and the
577 * parameters contains PBKDF2-params SEQUENCE.
578 */
579
580 if (asn1_get_sequence(pos, end - pos, &hdr, &end) < 0)
581 return -1;
582 pos = hdr.payload;
583
584 if (asn1_get_integer(pos, end - pos, &val, &pos) < 0)
585 return -1;
586 if (val != 0) {
587 wpa_printf(MSG_DEBUG, "DPP: pwri.version != 0");
588 return -1;
589 }
590
591 wpa_hexdump(MSG_MSGDUMP, "DPP: Remaining PasswordRecipientInfo after version",
592 pos, end - pos);
593
594 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !hdr.constructed ||
595 !asn1_is_cs_tag(&hdr, 0)) {
596 asn1_unexpected(&hdr,
597 "DPP: Expected keyDerivationAlgorithm [0]");
598 return -1;
599 }
600 pos = hdr.payload;
601 e_end = pos + hdr.length;
602
603 /* KeyDerivationAlgorithmIdentifier ::= AlgorithmIdentifier */
604 if (asn1_get_alg_id(pos, e_end - pos, &oid, ¶ms, ¶ms_len,
605 &next) < 0)
606 return -1;
607 if (!asn1_oid_equal(&oid, &asn1_pbkdf2_oid)) {
608 char buf[80];
609
610 asn1_oid_to_str(&oid, buf, sizeof(buf));
611 wpa_printf(MSG_DEBUG,
612 "DPP: Unexpected KeyDerivationAlgorithmIdentifier %s",
613 buf);
614 return -1;
615 }
616
617 /*
618 * PBKDF2-params ::= SEQUENCE {
619 * salt CHOICE {
620 * specified OCTET STRING,
621 * otherSource AlgorithmIdentifier}
622 * iterationCount INTEGER (1..MAX),
623 * keyLength INTEGER (1..MAX),
624 * prf AlgorithmIdentifier}
625 *
626 * salt is an 64 octet value, iterationCount is 1000, keyLength is based
627 * on Configurator signing key length, prf is
628 * id-hmacWithSHA{256,384,512} based on Configurator signing key.
629 */
630 if (!params ||
631 asn1_get_sequence(params, params_len, &hdr, &e_end) < 0)
632 return -1;
633 pos = hdr.payload;
634
635 if (asn1_get_next(pos, e_end - pos, &hdr) < 0 ||
636 !asn1_is_octetstring(&hdr)) {
637 asn1_unexpected(&hdr,
638 "DPP: Expected OCTETSTRING (salt.specified)");
639 return -1;
640 }
641 wpa_hexdump(MSG_MSGDUMP, "DPP: salt.specified",
642 hdr.payload, hdr.length);
643 if (hdr.length != 64) {
644 wpa_printf(MSG_DEBUG, "DPP: Unexpected salt length %u",
645 hdr.length);
646 return -1;
647 }
648 data->salt = hdr.payload;
649 pos = hdr.payload + hdr.length;
650
651 if (asn1_get_integer(pos, e_end - pos, &val, &pos) < 0)
652 return -1;
653 if (val != 1000) {
654 wpa_printf(MSG_DEBUG, "DPP: Unexpected iterationCount %d", val);
655 return -1;
656 }
657
658 if (asn1_get_integer(pos, e_end - pos, &val, &pos) < 0)
659 return -1;
660 if (val != 32 && val != 48 && val != 64) {
661 wpa_printf(MSG_DEBUG, "DPP: Unexpected keyLength %d", val);
662 return -1;
663 }
664 data->pbkdf2_key_len = val;
665
666 if (asn1_get_sequence(pos, e_end - pos, &hdr, NULL) < 0 ||
667 asn1_get_oid(hdr.payload, hdr.length, &oid, &pos) < 0) {
668 wpa_printf(MSG_DEBUG, "DPP: Could not parse prf");
669 return -1;
670 }
671 if (asn1_oid_equal(&oid, &asn1_pbkdf2_hmac_sha256_oid)) {
672 data->prf_hash_len = 32;
673 } else if (asn1_oid_equal(&oid, &asn1_pbkdf2_hmac_sha384_oid)) {
674 data->prf_hash_len = 48;
675 } else if (asn1_oid_equal(&oid, &asn1_pbkdf2_hmac_sha512_oid)) {
676 data->prf_hash_len = 64;
677 } else {
678 char buf[80];
679
680 asn1_oid_to_str(&oid, buf, sizeof(buf));
681 wpa_printf(MSG_DEBUG, "DPP: Unexpected PBKDF2-params.prf %s",
682 buf);
683 return -1;
684 }
685
686 pos = next;
687
688 /* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier
689 *
690 * KeyEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
691 *
692 * id-alg-AES-SIV-CMAC-aed-256, id-alg-AES-SIV-CMAC-aed-384, or
693 * id-alg-AES-SIV-CMAC-aed-512. */
694 if (asn1_get_alg_id(pos, end - pos, &oid, NULL, NULL, &pos) < 0)
695 return -1;
696 if (!asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_256_oid) &&
697 !asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_384_oid) &&
698 !asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_512_oid)) {
699 char buf[80];
700
701 asn1_oid_to_str(&oid, buf, sizeof(buf));
702 wpa_printf(MSG_DEBUG,
703 "DPP: Unexpected KeyEncryptionAlgorithmIdentifier %s",
704 buf);
705 return -1;
706 }
707
708 /*
709 * encryptedKey EncryptedKey
710 *
711 * EncryptedKey ::= OCTET STRING
712 */
713 if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
714 !asn1_is_octetstring(&hdr)) {
715 asn1_unexpected(&hdr,
716 "DPP: Expected OCTETSTRING (pwri.encryptedKey)");
717 return -1;
718 }
719 wpa_hexdump(MSG_MSGDUMP, "DPP: pwri.encryptedKey",
720 hdr.payload, hdr.length);
721 data->enc_key = hdr.payload;
722 data->enc_key_len = hdr.length;
723
724 return 0;
725 }
726
727
dpp_parse_encrypted_content_info(const u8 * pos,const u8 * end,struct dpp_enveloped_data * data)728 static int dpp_parse_encrypted_content_info(const u8 *pos, const u8 *end,
729 struct dpp_enveloped_data *data)
730 {
731 struct asn1_hdr hdr;
732 struct asn1_oid oid;
733
734 /*
735 * EncryptedContentInfo ::= SEQUENCE {
736 * contentType ContentType,
737 * contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
738 * encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL}
739 */
740 if (asn1_get_sequence(pos, end - pos, &hdr, &pos) < 0)
741 return -1;
742 wpa_hexdump(MSG_MSGDUMP, "DPP: EncryptedContentInfo",
743 hdr.payload, hdr.length);
744 if (pos < end) {
745 wpa_hexdump(MSG_DEBUG,
746 "DPP: Unexpected extra data after EncryptedContentInfo",
747 pos, end - pos);
748 return -1;
749 }
750
751 end = pos;
752 pos = hdr.payload;
753
754 /* ContentType ::= OBJECT IDENTIFIER */
755 if (asn1_get_oid(pos, end - pos, &oid, &pos) < 0) {
756 wpa_printf(MSG_DEBUG, "DPP: Could not parse ContentType");
757 return -1;
758 }
759 if (!asn1_oid_equal(&oid, &asn1_dpp_asymmetric_key_package_oid)) {
760 char buf[80];
761
762 asn1_oid_to_str(&oid, buf, sizeof(buf));
763 wpa_printf(MSG_DEBUG, "DPP: Unexpected ContentType %s", buf);
764 return -1;
765 }
766
767 /* ContentEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier */
768 if (asn1_get_alg_id(pos, end - pos, &oid, NULL, NULL, &pos) < 0)
769 return -1;
770 if (!asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_256_oid) &&
771 !asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_384_oid) &&
772 !asn1_oid_equal(&oid, &asn1_aes_siv_cmac_aead_512_oid)) {
773 char buf[80];
774
775 asn1_oid_to_str(&oid, buf, sizeof(buf));
776 wpa_printf(MSG_DEBUG,
777 "DPP: Unexpected ContentEncryptionAlgorithmIdentifier %s",
778 buf);
779 return -1;
780 }
781 /* ignore optional parameters */
782
783 /* encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL
784 * EncryptedContent ::= OCTET STRING */
785 if (asn1_get_next(pos, end - pos, &hdr) < 0 || hdr.constructed ||
786 !asn1_is_cs_tag(&hdr, 0)) {
787 asn1_unexpected(&hdr,
788 "DPP: Expected [0] IMPLICIT (EncryptedContent)");
789 return -1;
790 }
791 wpa_hexdump(MSG_MSGDUMP, "DPP: EncryptedContent",
792 hdr.payload, hdr.length);
793 data->enc_cont = hdr.payload;
794 data->enc_cont_len = hdr.length;
795 return 0;
796 }
797
798
dpp_parse_enveloped_data(const u8 * env_data,size_t env_data_len,struct dpp_enveloped_data * data)799 static int dpp_parse_enveloped_data(const u8 *env_data, size_t env_data_len,
800 struct dpp_enveloped_data *data)
801 {
802 struct asn1_hdr hdr;
803 const u8 *pos, *end;
804 int val;
805
806 os_memset(data, 0, sizeof(*data));
807
808 /*
809 * DPPEnvelopedData ::= EnvelopedData
810 *
811 * EnvelopedData ::= SEQUENCE {
812 * version CMSVersion,
813 * originatorInfo [0] IMPLICIT OriginatorInfo OPTIONAL,
814 * recipientInfos RecipientInfos,
815 * encryptedContentInfo EncryptedContentInfo,
816 * unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL}
817 *
818 * CMSVersion ::= INTEGER
819 *
820 * RecipientInfos ::= SET SIZE (1..MAX) OF RecipientInfo
821 *
822 * For DPP, version is 3, both originatorInfo and
823 * unprotectedAttrs are omitted, and recipientInfos contains a single
824 * RecipientInfo.
825 */
826 if (asn1_get_sequence(env_data, env_data_len, &hdr, &end) < 0)
827 return -1;
828 pos = hdr.payload;
829 if (end < env_data + env_data_len) {
830 wpa_hexdump(MSG_DEBUG,
831 "DPP: Unexpected extra data after DPPEnvelopedData",
832 end, env_data + env_data_len - end);
833 return -1;
834 }
835
836 if (asn1_get_integer(pos, end - pos, &val, &pos) < 0)
837 return -1;
838 if (val != 3) {
839 wpa_printf(MSG_DEBUG, "DPP: EnvelopedData.version != 3");
840 return -1;
841 }
842
843 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !asn1_is_set(&hdr)) {
844 asn1_unexpected(&hdr,
845 "DPP: Expected SET (RecipientInfos)");
846 return -1;
847 }
848
849 if (dpp_parse_recipient_infos(hdr.payload, hdr.length, data) < 0)
850 return -1;
851 return dpp_parse_encrypted_content_info(hdr.payload + hdr.length, end,
852 data);
853 }
854
855
856 static struct dpp_asymmetric_key *
dpp_parse_one_asymmetric_key(const u8 * buf,size_t len)857 dpp_parse_one_asymmetric_key(const u8 *buf, size_t len)
858 {
859 struct asn1_hdr hdr;
860 const u8 *pos = buf, *end = buf + len, *next;
861 int val;
862 const u8 *params;
863 size_t params_len;
864 struct asn1_oid oid;
865 char txt[80];
866 struct dpp_asymmetric_key *key;
867
868 wpa_hexdump_key(MSG_MSGDUMP, "DPP: OneAsymmetricKey", buf, len);
869
870 key = os_zalloc(sizeof(*key));
871 if (!key)
872 return NULL;
873
874 /*
875 * OneAsymmetricKey ::= SEQUENCE {
876 * version Version,
877 * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
878 * privateKey PrivateKey,
879 * attributes [0] Attributes OPTIONAL,
880 * ...,
881 * [[2: publicKey [1] BIT STRING OPTIONAL ]],
882 * ...
883 * }
884 */
885 if (asn1_get_sequence(pos, end - pos, &hdr, &end) < 0)
886 goto fail;
887 pos = hdr.payload;
888
889 /* Version ::= INTEGER { v1(0), v2(1) } (v1, ..., v2) */
890 if (asn1_get_integer(pos, end - pos, &val, &pos) < 0)
891 goto fail;
892 if (val != 0 && val != 1) {
893 wpa_printf(MSG_DEBUG,
894 "DPP: Unsupported DPPAsymmetricKeyPackage version %d",
895 val);
896 goto fail;
897 }
898
899 /* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier */
900 if (asn1_get_alg_id(pos, end - pos, &oid, ¶ms, ¶ms_len,
901 &pos) < 0)
902 goto fail;
903 if (!asn1_oid_equal(&oid, &asn1_ec_public_key_oid)) {
904 asn1_oid_to_str(&oid, txt, sizeof(txt));
905 wpa_printf(MSG_DEBUG,
906 "DPP: Unsupported PrivateKeyAlgorithmIdentifier %s",
907 txt);
908 goto fail;
909 }
910 wpa_hexdump(MSG_MSGDUMP, "DPP: PrivateKeyAlgorithmIdentifier params",
911 params, params_len);
912 /*
913 * ECParameters ::= CHOICE {
914 * namedCurve OBJECT IDENTIFIER
915 * -- implicitCurve NULL
916 * -- specifiedCurve SpecifiedECDomain}
917 */
918 if (!params || asn1_get_oid(params, params_len, &oid, &next) < 0) {
919 wpa_printf(MSG_DEBUG,
920 "DPP: Could not parse ECParameters.namedCurve");
921 goto fail;
922 }
923 asn1_oid_to_str(&oid, txt, sizeof(txt));
924 wpa_printf(MSG_MSGDUMP, "DPP: namedCurve %s", txt);
925 /* Assume the curve is identified within ECPrivateKey, so that this
926 * separate indication is not really needed. */
927
928 /*
929 * PrivateKey ::= OCTET STRING
930 * (Contains DER encoding of ECPrivateKey)
931 */
932 if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
933 !asn1_is_octetstring(&hdr)) {
934 asn1_unexpected(&hdr,
935 "DPP: Expected OCTETSTRING (PrivateKey)");
936 goto fail;
937 }
938 wpa_hexdump_key(MSG_MSGDUMP, "DPP: PrivateKey",
939 hdr.payload, hdr.length);
940 pos = hdr.payload + hdr.length;
941 key->csign = crypto_ec_key_parse_priv(hdr.payload, hdr.length);
942 if (!key->csign)
943 goto fail;
944 if (wpa_debug_show_keys)
945 dpp_debug_print_key("DPP: Received c-sign-key", key->csign);
946
947 /*
948 * Attributes ::= SET OF Attribute { { OneAsymmetricKeyAttributes } }
949 *
950 * Exactly one instance of type Attribute in OneAsymmetricKey.
951 */
952 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !hdr.constructed ||
953 !asn1_is_cs_tag(&hdr, 0)) {
954 asn1_unexpected(&hdr, "DPP: Expected [0] Attributes");
955 goto fail;
956 }
957 wpa_hexdump_key(MSG_MSGDUMP, "DPP: Attributes",
958 hdr.payload, hdr.length);
959 if (hdr.payload + hdr.length < end) {
960 wpa_hexdump_key(MSG_MSGDUMP,
961 "DPP: Ignore additional data at the end of OneAsymmetricKey",
962 hdr.payload + hdr.length,
963 end - (hdr.payload + hdr.length));
964 }
965 pos = hdr.payload;
966 end = hdr.payload + hdr.length;
967
968 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !asn1_is_set(&hdr)) {
969 asn1_unexpected(&hdr, "DPP: Expected SET (Attributes)");
970 goto fail;
971 }
972 if (hdr.payload + hdr.length < end) {
973 wpa_hexdump_key(MSG_MSGDUMP,
974 "DPP: Ignore additional data at the end of OneAsymmetricKey (after SET)",
975 hdr.payload + hdr.length,
976 end - (hdr.payload + hdr.length));
977 }
978 pos = hdr.payload;
979 end = hdr.payload + hdr.length;
980
981 /*
982 * OneAsymmetricKeyAttributes ATTRIBUTE ::= {
983 * aa-DPPConfigurationParameters,
984 * ... -- For local profiles
985 * }
986 *
987 * aa-DPPConfigurationParameters ATTRIBUTE ::=
988 * { TYPE DPPConfigurationParameters IDENTIFIED BY id-DPPConfigParams }
989 *
990 * Attribute ::= SEQUENCE {
991 * type OBJECT IDENTIFIER,
992 * values SET SIZE(1..MAX) OF Type
993 *
994 * Exactly one instance of ATTRIBUTE in attrValues.
995 */
996 if (asn1_get_sequence(pos, end - pos, &hdr, &pos) < 0)
997 goto fail;
998 if (pos < end) {
999 wpa_hexdump_key(MSG_MSGDUMP,
1000 "DPP: Ignore additional data at the end of ATTRIBUTE",
1001 pos, end - pos);
1002 }
1003 end = pos;
1004 pos = hdr.payload;
1005
1006 if (asn1_get_oid(pos, end - pos, &oid, &pos) < 0)
1007 goto fail;
1008 if (!asn1_oid_equal(&oid, &asn1_dpp_config_params_oid)) {
1009 asn1_oid_to_str(&oid, txt, sizeof(txt));
1010 wpa_printf(MSG_DEBUG,
1011 "DPP: Unexpected Attribute identifier %s", txt);
1012 goto fail;
1013 }
1014
1015 if (asn1_get_next(pos, end - pos, &hdr) < 0 || !asn1_is_set(&hdr)) {
1016 asn1_unexpected(&hdr, "DPP: Expected SET (Attribute)");
1017 goto fail;
1018 }
1019 pos = hdr.payload;
1020 end = hdr.payload + hdr.length;
1021
1022 /*
1023 * DPPConfigurationParameters ::= SEQUENCE {
1024 * privacyProtectionKey PrivateKey,
1025 * configurationTemplate UTF8String,
1026 * connectorTemplate UTF8String OPTIONAL}
1027 */
1028
1029 wpa_hexdump_key(MSG_MSGDUMP, "DPP: DPPConfigurationParameters",
1030 pos, end - pos);
1031 if (asn1_get_sequence(pos, end - pos, &hdr, &pos) < 0)
1032 goto fail;
1033 if (pos < end) {
1034 wpa_hexdump_key(MSG_MSGDUMP,
1035 "DPP: Ignore additional data after DPPConfigurationParameters",
1036 pos, end - pos);
1037 }
1038 end = pos;
1039 pos = hdr.payload;
1040
1041 /*
1042 * PrivateKey ::= OCTET STRING
1043 * (Contains DER encoding of ECPrivateKey)
1044 */
1045 if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
1046 !asn1_is_octetstring(&hdr)) {
1047 asn1_unexpected(&hdr, "DPP: Expected OCTETSTRING (PrivateKey)");
1048 goto fail;
1049 }
1050 wpa_hexdump_key(MSG_MSGDUMP, "DPP: privacyProtectionKey",
1051 hdr.payload, hdr.length);
1052 pos = hdr.payload + hdr.length;
1053 key->pp_key = crypto_ec_key_parse_priv(hdr.payload, hdr.length);
1054 if (!key->pp_key)
1055 goto fail;
1056 if (wpa_debug_show_keys)
1057 dpp_debug_print_key("DPP: Received privacyProtectionKey",
1058 key->pp_key);
1059
1060 if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
1061 !asn1_is_utf8string(&hdr)) {
1062 asn1_unexpected(&hdr,
1063 "DPP: Expected UTF8STRING (configurationTemplate)");
1064 goto fail;
1065 }
1066 wpa_hexdump_ascii_key(MSG_MSGDUMP, "DPP: configurationTemplate",
1067 hdr.payload, hdr.length);
1068 key->config_template = os_zalloc(hdr.length + 1);
1069 if (!key->config_template)
1070 goto fail;
1071 os_memcpy(key->config_template, hdr.payload, hdr.length);
1072
1073 pos = hdr.payload + hdr.length;
1074
1075 if (pos < end) {
1076 if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
1077 !asn1_is_utf8string(&hdr)) {
1078 asn1_unexpected(&hdr,
1079 "DPP: Expected UTF8STRING (connectorTemplate)");
1080 goto fail;
1081 }
1082 wpa_hexdump_ascii_key(MSG_MSGDUMP, "DPP: connectorTemplate",
1083 hdr.payload, hdr.length);
1084 key->connector_template = os_zalloc(hdr.length + 1);
1085 if (!key->connector_template)
1086 goto fail;
1087 os_memcpy(key->connector_template, hdr.payload, hdr.length);
1088 }
1089
1090 return key;
1091 fail:
1092 wpa_printf(MSG_DEBUG, "DPP: Failed to parse OneAsymmetricKey");
1093 dpp_free_asymmetric_key(key);
1094 return NULL;
1095 }
1096
1097
1098 static struct dpp_asymmetric_key *
dpp_parse_dpp_asymmetric_key_package(const u8 * key_pkg,size_t key_pkg_len)1099 dpp_parse_dpp_asymmetric_key_package(const u8 *key_pkg, size_t key_pkg_len)
1100 {
1101 struct asn1_hdr hdr;
1102 const u8 *pos = key_pkg, *end = key_pkg + key_pkg_len;
1103 struct dpp_asymmetric_key *first = NULL, *last = NULL, *key;
1104
1105 wpa_hexdump_key(MSG_MSGDUMP, "DPP: DPPAsymmetricKeyPackage",
1106 key_pkg, key_pkg_len);
1107
1108 /*
1109 * DPPAsymmetricKeyPackage ::= AsymmetricKeyPackage
1110 *
1111 * AsymmetricKeyPackage ::= SEQUENCE SIZE (1..MAX) OF OneAsymmetricKey
1112 */
1113 while (pos < end) {
1114 if (asn1_get_sequence(pos, end - pos, &hdr, &pos) < 0 ||
1115 !(key = dpp_parse_one_asymmetric_key(hdr.payload,
1116 hdr.length))) {
1117 dpp_free_asymmetric_key(first);
1118 return NULL;
1119 }
1120 if (!last) {
1121 first = last = key;
1122 } else {
1123 last->next = key;
1124 last = key;
1125 }
1126 }
1127
1128 return first;
1129 }
1130
1131
dpp_conf_resp_env_data(struct dpp_authentication * auth,const u8 * env_data,size_t env_data_len)1132 int dpp_conf_resp_env_data(struct dpp_authentication *auth,
1133 const u8 *env_data, size_t env_data_len)
1134 {
1135 u8 key[DPP_MAX_HASH_LEN];
1136 size_t key_len;
1137 u8 kek[DPP_MAX_HASH_LEN];
1138 u8 cont_encr_key[DPP_MAX_HASH_LEN];
1139 size_t cont_encr_key_len;
1140 int res;
1141 u8 *key_pkg;
1142 size_t key_pkg_len;
1143 struct dpp_enveloped_data data;
1144 struct dpp_asymmetric_key *keys;
1145
1146 wpa_hexdump(MSG_DEBUG, "DPP: DPPEnvelopedData", env_data, env_data_len);
1147
1148 if (dpp_parse_enveloped_data(env_data, env_data_len, &data) < 0)
1149 return -1;
1150
1151 key_len = auth->curve->hash_len;
1152 /* password = HKDF-Expand(bk, "Enveloped Data Password", length) */
1153 res = dpp_hkdf_expand(key_len, auth->bk, key_len,
1154 "Enveloped Data Password", key, key_len);
1155 if (res < 0)
1156 return -1;
1157 wpa_hexdump_key(MSG_DEBUG, "DPP: PBKDF2 key", key, key_len);
1158
1159 if (dpp_pbkdf2(data.prf_hash_len, key, key_len, data.salt, 64, 1000,
1160 kek, data.pbkdf2_key_len)) {
1161 wpa_printf(MSG_DEBUG, "DPP: PBKDF2 failed");
1162 return -1;
1163 }
1164 wpa_hexdump_key(MSG_DEBUG, "DPP: key-encryption key from PBKDF2",
1165 kek, data.pbkdf2_key_len);
1166
1167 if (data.enc_key_len < AES_BLOCK_SIZE ||
1168 data.enc_key_len > sizeof(cont_encr_key) + AES_BLOCK_SIZE) {
1169 wpa_printf(MSG_DEBUG, "DPP: Invalid encryptedKey length");
1170 return -1;
1171 }
1172 res = aes_siv_decrypt(kek, data.pbkdf2_key_len,
1173 data.enc_key, data.enc_key_len,
1174 0, NULL, NULL, cont_encr_key);
1175 forced_memzero(kek, data.pbkdf2_key_len);
1176 if (res < 0) {
1177 wpa_printf(MSG_DEBUG,
1178 "DPP: AES-SIV decryption of encryptedKey failed");
1179 return -1;
1180 }
1181 cont_encr_key_len = data.enc_key_len - AES_BLOCK_SIZE;
1182 wpa_hexdump_key(MSG_DEBUG, "DPP: content-encryption key",
1183 cont_encr_key, cont_encr_key_len);
1184
1185 if (data.enc_cont_len < AES_BLOCK_SIZE)
1186 return -1;
1187 key_pkg_len = data.enc_cont_len - AES_BLOCK_SIZE;
1188 key_pkg = os_malloc(key_pkg_len);
1189 if (!key_pkg)
1190 return -1;
1191 res = aes_siv_decrypt(cont_encr_key, cont_encr_key_len,
1192 data.enc_cont, data.enc_cont_len,
1193 0, NULL, NULL, key_pkg);
1194 forced_memzero(cont_encr_key, cont_encr_key_len);
1195 if (res < 0) {
1196 bin_clear_free(key_pkg, key_pkg_len);
1197 wpa_printf(MSG_DEBUG,
1198 "DPP: AES-SIV decryption of encryptedContent failed");
1199 return -1;
1200 }
1201
1202 keys = dpp_parse_dpp_asymmetric_key_package(key_pkg, key_pkg_len);
1203 bin_clear_free(key_pkg, key_pkg_len);
1204 dpp_free_asymmetric_key(auth->conf_key_pkg);
1205 auth->conf_key_pkg = keys;
1206
1207 return keys != NULL;
1208 }
1209
1210 #endif /* CONFIG_DPP2 */
1211
