1 /*
2 * Wi-Fi Protected Setup - common functionality
3 * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8 #include <string.h>
9
10 #include "utils/includes.h"
11 #include "utils/common.h"
12
13 #include "crypto/aes_wrap.h"
14 #include "crypto/crypto.h"
15 #include "crypto/sha1.h"
16 #include "crypto/sha256.h"
17 #include "crypto/dh_group5.h"
18 #include "crypto/random.h"
19
20 #include "wps/wps_i.h"
21
wps_kdf(const u8 * key,const u8 * label_prefix,size_t label_prefix_len,const char * label,u8 * res,size_t res_len)22 void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
23 const char *label, u8 *res, size_t res_len)
24 {
25 u8 i_buf[4], key_bits[4];
26 const u8 *addr[4];
27 size_t len[4];
28 int i, iter;
29 u8 hash[SHA256_MAC_LEN], *opos;
30 size_t left;
31
32 WPA_PUT_BE32(key_bits, res_len * 8);
33
34 addr[0] = i_buf;
35 len[0] = sizeof(i_buf);
36 addr[1] = label_prefix;
37 len[1] = label_prefix_len;
38 addr[2] = (const u8 *) label;
39 len[2] = os_strlen(label);
40 addr[3] = key_bits;
41 len[3] = sizeof(key_bits);
42
43 iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
44 opos = res;
45 left = res_len;
46
47 for (i = 1; i <= iter; i++) {
48 WPA_PUT_BE32(i_buf, i);
49 hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
50 if (i < iter) {
51 os_memcpy(opos, hash, SHA256_MAC_LEN);
52 opos += SHA256_MAC_LEN;
53 left -= SHA256_MAC_LEN;
54 } else
55 os_memcpy(opos, hash, left);
56 }
57 }
58
59
wps_derive_keys(struct wps_data * wps)60 int wps_derive_keys(struct wps_data *wps)
61 {
62 struct wpabuf *pubkey, *dh_shared;
63 u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
64 const u8 *addr[3];
65 size_t len[3];
66 u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
67
68 if (wps->dh_privkey == NULL) {
69 wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
70 return -1;
71 }
72
73 pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
74 if (pubkey == NULL) {
75 wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
76 return -1;
77 }
78
79 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
80 wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey);
81 dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
82 dh5_free(wps->dh_ctx);
83 wps->dh_ctx = NULL;
84 dh_shared = wpabuf_zeropad(dh_shared, 192);
85 if (dh_shared == NULL) {
86 wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
87 return -1;
88 }
89
90 /* Own DH private key is not needed anymore */
91 /*
92 * due to the public key calculated when wps start, it will not calculate anymore even when we build M1 message, also calculate the key need take a long time
93 * which would cause WPS fail, so we clean the key after WPS finished .
94 */
95 #ifndef ESP32_WORKAROUND
96 wpabuf_free(wps->dh_privkey);
97 wps->dh_privkey = NULL;
98 #endif //ESP32_WORKAROUND
99
100 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
101
102 /* DHKey = SHA-256(g^AB mod p) */
103 addr[0] = wpabuf_head(dh_shared);
104 len[0] = wpabuf_len(dh_shared);
105
106 sha256_vector(1, addr, len, dhkey);
107 wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
108 wpabuf_free(dh_shared);
109
110 /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
111 addr[0] = wps->nonce_e;
112 len[0] = WPS_NONCE_LEN;
113 addr[1] = wps->mac_addr_e;
114 len[1] = ETH_ALEN;
115 addr[2] = wps->nonce_r;
116 len[2] = WPS_NONCE_LEN;
117 hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
118 wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
119
120 wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
121 keys, sizeof(keys));
122 os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
123 os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
124 os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
125 WPS_EMSK_LEN);
126
127 wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
128 wps->authkey, WPS_AUTHKEY_LEN);
129 wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
130 wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
131 wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
132
133 return 0;
134 }
135
136
wps_derive_psk(struct wps_data * wps,const u8 * dev_passwd,size_t dev_passwd_len)137 void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
138 size_t dev_passwd_len)
139 {
140 u8 hash[SHA256_MAC_LEN];
141
142 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
143 (dev_passwd_len + 1) / 2, hash);
144 os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
145 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
146 dev_passwd + (dev_passwd_len + 1) / 2,
147 dev_passwd_len / 2, hash);
148 os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
149
150 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
151 dev_passwd, dev_passwd_len);
152 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
153 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
154 }
155
156
wps_decrypt_encr_settings(struct wps_data * wps,const u8 * encr,size_t encr_len)157 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
158 size_t encr_len)
159 {
160 struct wpabuf *decrypted;
161 const size_t block_size = 16;
162 size_t i;
163 u8 pad;
164 const u8 *pos;
165
166 /* AES-128-CBC */
167 if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
168 {
169 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
170 return NULL;
171 }
172
173 decrypted = wpabuf_alloc(encr_len - block_size);
174 if (decrypted == NULL)
175 return NULL;
176
177 wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
178 wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
179 wpa_printf(MSG_DEBUG, "WPS: AES Decrypt setting");
180 if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
181 wpabuf_len(decrypted))) {
182 wpabuf_free(decrypted);
183 return NULL;
184 }
185
186 wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
187 decrypted);
188
189 pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
190 pad = *pos;
191 if (pad > wpabuf_len(decrypted)) {
192 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
193 wpabuf_free(decrypted);
194 return NULL;
195 }
196 for (i = 0; i < pad; i++) {
197 if (*pos-- != pad) {
198 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
199 "string");
200 wpabuf_free(decrypted);
201 return NULL;
202 }
203 }
204 decrypted->used -= pad;
205
206 return decrypted;
207 }
208
209 #ifdef CONFIG_WPS_PIN
210 /**
211 * wps_pin_checksum - Compute PIN checksum
212 * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
213 * Returns: Checksum digit
214 */
wps_pin_checksum(unsigned int pin)215 unsigned int wps_pin_checksum(unsigned int pin)
216 {
217 unsigned int accum = 0;
218 while (pin) {
219 accum += 3 * (pin % 10);
220 pin /= 10;
221 accum += pin % 10;
222 pin /= 10;
223 }
224
225 return (10 - accum % 10) % 10;
226 }
227
228
229 /**
230 * wps_pin_valid - Check whether a PIN has a valid checksum
231 * @pin: Eight digit PIN (i.e., including the checksum digit)
232 * Returns: 1 if checksum digit is valid, or 0 if not
233 */
wps_pin_valid(unsigned int pin)234 unsigned int wps_pin_valid(unsigned int pin)
235 {
236 return wps_pin_checksum(pin / 10) == (pin % 10);
237 }
238
239
240 /**
241 * wps_generate_pin - Generate a random PIN
242 * Returns: Eight digit PIN (i.e., including the checksum digit)
243 */
wps_generate_pin(void)244 unsigned int wps_generate_pin(void)
245 {
246 unsigned int val;
247
248 /* Generate seven random digits for the PIN */
249 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) {
250 return -1;
251 }
252 val %= 10000000;
253
254 /* Append checksum digit */
255 return val * 10 + wps_pin_checksum(val);
256 }
257
258
wps_pin_str_valid(const char * pin)259 int wps_pin_str_valid(const char *pin)
260 {
261 const char *p;
262 size_t len;
263
264 p = pin;
265 while (*p >= '0' && *p <= '9')
266 p++;
267 if (*p != '\0')
268 return 0;
269
270 len = p - pin;
271 return len == 4 || len == 8;
272 }
273 #endif
274
wps_fail_event(struct wps_context * wps,enum wps_msg_type msg,u16 config_error,u16 error_indication)275 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,
276 u16 config_error, u16 error_indication)
277 {
278 union wps_event_data *data;
279
280 data = (union wps_event_data *)os_zalloc(sizeof(union wps_event_data));
281 if (data == NULL)
282 return;
283
284 if (wps->event_cb == NULL) {
285 os_free(data);
286 return;
287 }
288
289 os_memset(data, 0, sizeof(union wps_event_data));
290 data->fail.msg = msg;
291 data->fail.config_error = config_error;
292 data->fail.error_indication = error_indication;
293 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, data);
294 os_free(data);
295 }
296
297
wps_success_event(struct wps_context * wps)298 void wps_success_event(struct wps_context *wps)
299 {
300 if (wps->event_cb == NULL)
301 return;
302
303 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, NULL);
304 }
305
306
wps_pwd_auth_fail_event(struct wps_context * wps,int enrollee,int part)307 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part)
308 {
309 union wps_event_data *data;
310
311 data = (union wps_event_data *)os_zalloc(sizeof(union wps_event_data));
312 if (data == NULL)
313 return;
314
315 if (wps->event_cb == NULL) {
316 os_free(data);
317 return;
318 }
319
320 os_memset(data, 0, sizeof(union wps_event_data));
321 data->pwd_auth_fail.enrollee = enrollee;
322 data->pwd_auth_fail.part = part;
323 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, data);
324 os_free(data);
325 }
326
327
wps_pbc_overlap_event(struct wps_context * wps)328 void wps_pbc_overlap_event(struct wps_context *wps)
329 {
330 if (wps->event_cb == NULL)
331 return;
332
333 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
334 }
335
336
wps_pbc_timeout_event(struct wps_context * wps)337 void wps_pbc_timeout_event(struct wps_context *wps)
338 {
339 if (wps->event_cb == NULL)
340 return;
341
342 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
343 }
344
345
346 #ifdef CONFIG_WPS_OOB
347
wps_get_oob_cred(struct wps_context * wps)348 struct wpabuf * wps_get_oob_cred(struct wps_context *wps)
349 {
350 struct wps_data *data;
351 struct wpabuf *plain;
352
353 data = (struct wps_data *)os_zalloc(sizeof(struct wps_data));
354 if (data == NULL)
355 return NULL;
356
357 plain = wpabuf_alloc(500);
358 if (plain == NULL) {
359 os_free(data);
360 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
361 "credential");
362 return NULL;
363 }
364
365 os_memset(data, 0, sizeof(struct wps_data));
366 data->wps = wps;
367 data->auth_type = wps->auth_types;
368 data->encr_type = wps->encr_types;
369 if (wps_build_version(plain) ||
370 wps_build_cred(data, plain) ||
371 wps_build_wfa_ext(plain, 0, NULL, 0)) {
372 wpabuf_free(plain);
373 os_free(data);
374 return NULL;
375 }
376
377 os_free(data);
378 return plain;
379 }
380
381 #ifdef CONFIG_WPS_NFC
382
wps_build_nfc_pw_token(u16 dev_pw_id,const struct wpabuf * pubkey,const struct wpabuf * dev_pw)383 struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id,
384 const struct wpabuf *pubkey,
385 const struct wpabuf *dev_pw)
386 {
387 struct wpabuf *data;
388
389 data = wpabuf_alloc(200);
390 if (data == NULL)
391 return NULL;
392
393 if (wps_build_version(data) ||
394 wps_build_oob_dev_pw(data, dev_pw_id, pubkey,
395 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) ||
396 wps_build_wfa_ext(data, 0, NULL, 0)) {
397 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password "
398 "token");
399 wpabuf_free(data);
400 return NULL;
401 }
402
403 return data;
404 }
405
406 #endif
407
wps_oob_use_cred(struct wps_context * wps,struct wps_parse_attr * attr)408 int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr)
409 {
410 struct wpabuf msg;
411 size_t i;
412
413 for (i = 0; i < attr->num_cred; i++) {
414 struct wps_credential local_cred;
415 struct wps_parse_attr cattr;
416
417 os_memset(&local_cred, 0, sizeof(local_cred));
418 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]);
419 if (wps_parse_msg(&msg, &cattr) < 0 ||
420 wps_process_cred(&cattr, &local_cred)) {
421 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
422 "credential");
423 return -1;
424 }
425 wps->cred_cb(wps->cb_ctx, &local_cred);
426 }
427
428 return 0;
429 }
430
431
432 #endif /* CONFIG_WPS_OOB */
433
434
wps_dev_type_str2bin(const char * str,u8 dev_type[WPS_DEV_TYPE_LEN])435 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
436 {
437 const char *pos;
438
439 /* <categ>-<OUI>-<subcateg> */
440 WPA_PUT_BE16(dev_type, atoi(str));
441 pos = (char *)os_strchr(str, '-');
442 if (pos == NULL)
443 return -1;
444 pos++;
445 if (hexstr2bin(pos, &dev_type[2], 4))
446 return -1;
447 pos = (char *)os_strchr(pos, '-');
448 if (pos == NULL)
449 return -1;
450 pos++;
451 WPA_PUT_BE16(&dev_type[6], atoi(pos));
452
453
454 return 0;
455 }
456
457
wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN],char * buf,size_t buf_len)458 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
459 size_t buf_len)
460 {
461 int ret;
462
463 ret = snprintf(buf, buf_len, "%u-%08X-%u",
464 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
465 WPA_GET_BE16(&dev_type[6]));
466 if (ret < 0 || (unsigned int) ret >= buf_len)
467 return NULL;
468
469 return buf;
470 }
471
472
uuid_gen_mac_addr(const u8 * mac_addr,u8 * uuid)473 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
474 {
475 const u8 *addr[2];
476 size_t len[2];
477 u8 hash[SHA1_MAC_LEN];
478 u8 nsid[16] = {
479 0x52, 0x64, 0x80, 0xf8,
480 0xc9, 0x9b,
481 0x4b, 0xe5,
482 0xa6, 0x55,
483 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
484 };
485
486 addr[0] = nsid;
487 len[0] = sizeof(nsid);
488 addr[1] = mac_addr;
489 len[1] = 6;
490 sha1_vector(2, addr, len, hash);
491 os_memcpy(uuid, hash, 16);
492
493 /* Version: 5 = named-based version using SHA-1 */
494 uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
495
496 /* Variant specified in RFC 4122 */
497 uuid[8] = 0x80 | (uuid[8] & 0x3f);
498 }
499
500
wps_config_methods_str2bin(const char * str)501 u16 wps_config_methods_str2bin(const char *str)
502 {
503 u16 methods = 0;
504
505 if (str == NULL) {
506 /* Default to enabling methods based on build configuration */
507 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
508 #ifdef CONFIG_WPS2
509 methods |= WPS_CONFIG_VIRT_DISPLAY;
510 #endif /* CONFIG_WPS2 */
511 #ifdef CONFIG_WPS_NFC
512 methods |= WPS_CONFIG_NFC_INTERFACE;
513 #endif /* CONFIG_WPS_NFC */
514 } else {
515 if (os_strstr(str, "ethernet"))
516 methods |= WPS_CONFIG_ETHERNET;
517 if (os_strstr(str, "label"))
518 methods |= WPS_CONFIG_LABEL;
519 if (os_strstr(str, "display"))
520 methods |= WPS_CONFIG_DISPLAY;
521 if (os_strstr(str, "ext_nfc_token"))
522 methods |= WPS_CONFIG_EXT_NFC_TOKEN;
523 if (os_strstr(str, "int_nfc_token"))
524 methods |= WPS_CONFIG_INT_NFC_TOKEN;
525 if (os_strstr(str, "nfc_interface"))
526 methods |= WPS_CONFIG_NFC_INTERFACE;
527 if (os_strstr(str, "push_button"))
528 methods |= WPS_CONFIG_PUSHBUTTON;
529 if (os_strstr(str, "keypad"))
530 methods |= WPS_CONFIG_KEYPAD;
531 #ifdef CONFIG_WPS2
532 if (os_strstr(str, "virtual_display"))
533 methods |= WPS_CONFIG_VIRT_DISPLAY;
534 if (os_strstr(str, "physical_display"))
535 methods |= WPS_CONFIG_PHY_DISPLAY;
536 if (os_strstr(str, "virtual_push_button"))
537 methods |= WPS_CONFIG_VIRT_PUSHBUTTON;
538 if (os_strstr(str, "physical_push_button"))
539 methods |= WPS_CONFIG_PHY_PUSHBUTTON;
540 #endif /* CONFIG_WPS2 */
541 }
542
543 return methods;
544 }
545
546
wps_build_wsc_ack(struct wps_data * wps)547 struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
548 {
549 struct wpabuf *msg;
550
551 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
552
553 msg = wpabuf_alloc(1000);
554 if (msg == NULL)
555 return NULL;
556
557 if (wps_build_version(msg) ||
558 wps_build_msg_type(msg, WPS_WSC_ACK) ||
559 wps_build_enrollee_nonce(wps, msg) ||
560 wps_build_registrar_nonce(wps, msg) ||
561 wps_build_wfa_ext(msg, 0, NULL, 0)) {
562 wpabuf_free(msg);
563 return NULL;
564 }
565
566 return msg;
567 }
568
569
wps_build_wsc_nack(struct wps_data * wps)570 struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
571 {
572 struct wpabuf *msg;
573
574 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
575
576 msg = wpabuf_alloc(1000);
577 if (msg == NULL)
578 return NULL;
579
580 if (wps_build_version(msg) ||
581 wps_build_msg_type(msg, WPS_WSC_NACK) ||
582 wps_build_enrollee_nonce(wps, msg) ||
583 wps_build_registrar_nonce(wps, msg) ||
584 wps_build_config_error(msg, wps->config_error) ||
585 wps_build_wfa_ext(msg, 0, NULL, 0)) {
586 wpabuf_free(msg);
587 return NULL;
588 }
589
590 return msg;
591 }
592
593
594 #ifdef CONFIG_WPS_NFC
wps_nfc_token_gen(int ndef,int * id,struct wpabuf ** pubkey,struct wpabuf ** privkey,struct wpabuf ** dev_pw)595 struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey,
596 struct wpabuf **privkey,
597 struct wpabuf **dev_pw)
598 {
599 struct wpabuf *priv = NULL, *pub = NULL, *pw, *ret;
600 void *dh_ctx;
601 u16 val;
602
603 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN);
604 if (pw == NULL)
605 return NULL;
606
607 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN),
608 WPS_OOB_DEVICE_PASSWORD_LEN) ||
609 random_get_bytes((u8 *) &val, sizeof(val))) {
610 wpabuf_free(pw);
611 return NULL;
612 }
613
614 dh_ctx = dh5_init(&priv, &pub);
615 if (dh_ctx == NULL) {
616 wpabuf_free(pw);
617 return NULL;
618 }
619 dh5_free(dh_ctx);
620
621 *id = 0x10 + val % 0xfff0;
622 wpabuf_free(*pubkey);
623 *pubkey = pub;
624 wpabuf_free(*privkey);
625 *privkey = priv;
626 wpabuf_free(*dev_pw);
627 *dev_pw = pw;
628
629 ret = wps_build_nfc_pw_token(*id, *pubkey, *dev_pw);
630 if (ndef && ret) {
631 struct wpabuf *tmp;
632 tmp = ndef_build_wifi(ret);
633 wpabuf_free(ret);
634 if (tmp == NULL)
635 return NULL;
636 ret = tmp;
637 }
638
639 return ret;
640 }
641 #endif /* CONFIG_WPS_NFC */
642
