1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
|
/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <ctype.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/obj_mac.h>
#include <openssl/rand.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "rma_auth.h"
#include "curve25519.h"
#include "sha256.h"
#include "base32.h"
#define EC_COORDINATE_SZ 32
#define EC_PRIV_KEY_SZ 32
#define EC_P256_UNCOMPRESSED_PUB_KEY_SZ (EC_COORDINATE_SZ * 2 + 1)
#define EC_P256_COMPRESSED_PUB_KEY_SZ (EC_COORDINATE_SZ + 1)
#define SERVER_ADDRESS \
"https://www.google.com/chromeos/partner/console/cr50reset/request"
/* Test server keys for x25519 and p256 curves. */
static const uint8_t rma_test_server_x25519_public_key[] = {
0x03, 0xae, 0x2d, 0x2c, 0x06, 0x23, 0xe0, 0x73, 0x0d, 0xd3, 0xb7,
0x92, 0xac, 0x54, 0xc5, 0xfd, 0x7e, 0x9c, 0xf0, 0xa8, 0xeb, 0x7e,
0x2a, 0xb5, 0xdb, 0xf4, 0x79, 0x5f, 0x8a, 0x0f, 0x28, 0x3f
};
static const uint8_t rma_test_server_x25519_private_key[] = {
0x47, 0x3b, 0xa5, 0xdb, 0xc4, 0xbb, 0xd6, 0x77, 0x20, 0xbd, 0xd8,
0xbd, 0xc8, 0x7a, 0xbb, 0x07, 0x03, 0x79, 0xba, 0x7b, 0x52, 0x8c,
0xec, 0xb3, 0x4d, 0xaa, 0x69, 0xf5, 0x65, 0xb4, 0x31, 0xad
};
#define RMA_TEST_SERVER_X25519_KEY_ID 0x10
#define RMA_PROD_SERVER_X25519_KEY_ID 0
/*
* P256 curve keys, generated using openssl as follows:
*
* openssl ecparam -name prime256v1 -genkey -out key.pem
* openssl ec -in key.pem -text -noout
*/
static const uint8_t rma_test_server_p256_private_key[] = {
0x54, 0xb0, 0x82, 0x92, 0x54, 0x92, 0xfc, 0x4a, 0xa7, 0x6b, 0xea,
0x8f, 0x30, 0xcc, 0xf7, 0x3d, 0xa2, 0xf6, 0xa7, 0xad, 0xf0, 0xec,
0x7d, 0xe9, 0x26, 0x75, 0xd1, 0xec, 0xde, 0x20, 0x8f, 0x81
};
/*
* P256 public key in full form, x and y coordinates with a single byte
* prefix, 65 bytes total.
*/
static const uint8_t rma_test_server_p256_public_key[] = {
0x04, 0xe7, 0xbe, 0x37, 0xaa, 0x68, 0xca, 0xcc, 0x68, 0xf4, 0x8c,
0x56, 0x65, 0x5a, 0xcb, 0xf8, 0xf4, 0x65, 0x3c, 0xd3, 0xc6, 0x1b,
0xae, 0xd6, 0x51, 0x7a, 0xcc, 0x00, 0x8d, 0x59, 0x6d, 0x1b, 0x0a,
0x66, 0xe8, 0x68, 0x5e, 0x6a, 0x82, 0x19, 0x81, 0x76, 0x84, 0x92,
0x7f, 0x8d, 0xb2, 0xbe, 0xf5, 0x39, 0x50, 0xd5, 0xfe, 0xee, 0x00,
0x67, 0xcf, 0x40, 0x5f, 0x68, 0x12, 0x83, 0x4f, 0xa4, 0x35
};
#define RMA_TEST_SERVER_P256_KEY_ID 0x20
#define RMA_PROD_SERVER_P256_KEY_ID 0x01
/* Default values which can change based on command line arguments. */
static uint8_t server_key_id = RMA_TEST_SERVER_X25519_KEY_ID;
static uint8_t board_id[4] = { 'Z', 'Z', 'C', 'R' };
static uint8_t device_id[8] = { 'T', 'H', 'X', 1, 1, 3, 8, 0xfe };
static uint8_t hw_id[20] = "TESTSAMUS1234";
static char challenge[RMA_CHALLENGE_BUF_SIZE];
static char authcode[RMA_AUTHCODE_BUF_SIZE];
static char *progname;
static char *short_opts = "a:b:c:d:hpk:tw:";
static const struct option long_opts[] = {
/* name hasarg *flag val */
{ "auth_code", 1, NULL, 'a' }, { "board_id", 1, NULL, 'b' },
{ "challenge", 1, NULL, 'c' }, { "device_id", 1, NULL, 'd' },
{ "help", 0, NULL, 'h' }, { "hw_id", 1, NULL, 'w' },
{ "key_id", 1, NULL, 'k' }, { "p256", 0, NULL, 'p' },
{ "test", 0, NULL, 't' }, {},
};
void panic_assert_fail(const char *fname, int linenum);
void rand_bytes(void *buffer, size_t len);
int safe_memcmp(const void *s1, const void *s2, size_t size);
void panic_assert_fail(const char *fname, int linenum)
{
printf("\nASSERTION FAILURE at %s:%d\n", fname, linenum);
}
int safe_memcmp(const void *s1, const void *s2, size_t size)
{
const uint8_t *us1 = s1;
const uint8_t *us2 = s2;
int result = 0;
if (size == 0)
return 0;
while (size--)
result |= *us1++ ^ *us2++;
return result != 0;
}
void rand_bytes(void *buffer, size_t len)
{
RAND_bytes(buffer, len);
}
/*
* Generate a p256 key pair and calculate the shared secret based on our
* private key and the server public key.
*
* Return the X coordinate of the generated public key and the shared secret.
*
* @pub_key - the compressed public key without the prefix; by convention
* between RMA client and server the generated pubic key would
* always have prefix of 0x03, (the Y coordinate value is odd), so
* it is omitted from the key blob, which allows to keep the blob
* size at 32 bytes.
* @secret_seed - the product of multiplying of the server point by our
* private key, only the 32 bytes of X coordinate are returned.
*/
static void p256_key_and_secret_seed(uint8_t pub_key[32],
uint8_t secret_seed[32])
{
const EC_GROUP *group;
EC_KEY *key;
EC_POINT *pub;
EC_POINT *secret_point;
uint8_t buf[EC_P256_UNCOMPRESSED_PUB_KEY_SZ];
/* Prepare structures to operate on. */
key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
group = EC_KEY_get0_group(key);
pub = EC_POINT_new(group);
/*
* We might have to try multiple times, until the Y coordinate is an
* odd value as required by convention.
*/
do {
EC_KEY_generate_key(key);
/* Extract public key into an octal array. */
EC_POINT_point2oct(group, EC_KEY_get0_public_key(key),
POINT_CONVERSION_UNCOMPRESSED, buf,
sizeof(buf), NULL);
/* If Y coordinate is an odd value, we are done. */
} while (!(buf[sizeof(buf) - 1] & 1));
/* Copy X coordinate out. */
memcpy(pub_key, buf + 1, 32);
/*
* We have our private key and the server's point coordinates (aka
* server public key). Let's multiply the coordinates by our private
* key to get the shared secret.
*/
/* Load raw public key into the point structure. */
EC_POINT_oct2point(group, pub, rma_test_server_p256_public_key,
sizeof(rma_test_server_p256_public_key), NULL);
secret_point = EC_POINT_new(group);
/* Multiply server public key by our private key. */
EC_POINT_mul(group, secret_point, 0, pub, EC_KEY_get0_private_key(key),
0);
/* Pull the result back into the octal buffer. */
EC_POINT_point2oct(group, secret_point, POINT_CONVERSION_UNCOMPRESSED,
buf, sizeof(buf), NULL);
/*
* Copy X coordinate into the output to use as the shared secret
* seed.
*/
memcpy(secret_seed, buf + 1, 32);
/* release resources */
EC_KEY_free(key);
EC_POINT_free(pub);
EC_POINT_free(secret_point);
}
/*
* When imitating server side, calculate the secret value given the client's
* compressed public key (X coordinate only with 0x03 prefix implied) and
* knowing our (server) private key.
*
* @secret - array to return the X coordinate of the calculated point.
* @raw_pub_key - X coordinate of the point calculated by the client, 0x03
* prefix implied.
*/
static void p256_calculate_secret(uint8_t secret[32],
const uint8_t raw_pub_key[32])
{
uint8_t raw_pub_key_x[EC_P256_COMPRESSED_PUB_KEY_SZ];
EC_KEY *key;
const uint8_t *kp = raw_pub_key_x;
EC_POINT *secret_point;
const EC_GROUP *group;
BIGNUM *priv;
uint8_t buf[EC_P256_UNCOMPRESSED_PUB_KEY_SZ];
/* Express server private key as a BN. */
priv = BN_new();
BN_bin2bn(rma_test_server_p256_private_key, EC_PRIV_KEY_SZ, priv);
/*
* Populate a p256 key structure based on the compressed
* representation of the client's public key.
*/
raw_pub_key_x[0] = 3; /* Implied by convention. */
memcpy(raw_pub_key_x + 1, raw_pub_key, sizeof(raw_pub_key_x) - 1);
key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
group = EC_KEY_get0_group(key);
key = o2i_ECPublicKey(&key, &kp, sizeof(raw_pub_key_x));
/* This is where the multiplication result will go. */
secret_point = EC_POINT_new(group);
/* Multiply client's point by our private key. */
EC_POINT_mul(group, secret_point, 0, EC_KEY_get0_public_key(key), priv,
0);
/* Pull the result back into the octal buffer. */
EC_POINT_point2oct(group, secret_point, POINT_CONVERSION_UNCOMPRESSED,
buf, sizeof(buf), NULL);
/* Copy X coordinate into the output to use as the shared secret. */
memcpy(secret, buf + 1, 32);
}
static int rma_server_side(const char *generated_challenge)
{
int key_id, version;
uint8_t secret[32];
uint8_t hmac[32];
struct rma_challenge c;
uint8_t *cptr = (uint8_t *)&c;
/* Convert the challenge back into binary */
if (base32_decode(cptr, 8 * sizeof(c), generated_challenge, 9) !=
8 * sizeof(c)) {
printf("Error decoding challenge\n");
return -1;
}
version = RMA_CHALLENGE_GET_VERSION(c.version_key_id);
key_id = RMA_CHALLENGE_GET_KEY_ID(c.version_key_id);
printf("Challenge: %s\n", generated_challenge);
printf("Version: %d\n", version);
printf("Server KeyID: %d\n", key_id);
if (version != RMA_CHALLENGE_VERSION)
printf("Unsupported challenge version %d\n", version);
/* Calculate the shared secret, use curve based on the key ID. */
switch (key_id) {
case RMA_PROD_SERVER_X25519_KEY_ID:
printf("Unsupported Prod KeyID %d\n", key_id);
case RMA_TEST_SERVER_X25519_KEY_ID:
X25519(secret, rma_test_server_x25519_private_key,
c.device_pub_key);
break;
case RMA_PROD_SERVER_P256_KEY_ID:
printf("Unsupported Prod KeyID %d\n", key_id);
case RMA_TEST_SERVER_P256_KEY_ID:
p256_calculate_secret(secret, c.device_pub_key);
break;
default:
printf("Unknown KeyID %d\n", key_id);
return 1;
}
/*
* Auth code is a truncated HMAC of the ephemeral public key, BoardID,
* and DeviceID.
*/
hmac_SHA256(hmac, secret, sizeof(secret), cptr + 1, sizeof(c) - 1);
if (base32_encode(authcode, RMA_AUTHCODE_BUF_SIZE, hmac,
RMA_AUTHCODE_CHARS * 5, 0)) {
printf("Error encoding auth code\n");
return -1;
}
printf("Authcode: %s\n", authcode);
return 0;
};
static int rma_create_test_challenge(int p256_mode)
{
uint8_t temp[32]; /* Private key or HMAC */
uint8_t secret_seed[32];
struct rma_challenge c;
uint8_t *cptr = (uint8_t *)&c;
uint32_t bid;
/* Clear the current challenge and authcode, if any */
memset(challenge, 0, sizeof(challenge));
memset(authcode, 0, sizeof(authcode));
memset(&c, 0, sizeof(c));
c.version_key_id =
RMA_CHALLENGE_VKID_BYTE(RMA_CHALLENGE_VERSION, server_key_id);
memcpy(&bid, board_id, sizeof(bid));
bid = be32toh(bid);
memcpy(c.board_id, &bid, sizeof(c.board_id));
memcpy(c.device_id, device_id, sizeof(c.device_id));
if (p256_mode) {
p256_key_and_secret_seed(c.device_pub_key, secret_seed);
} else {
/* Calculate a new ephemeral key pair */
X25519_keypair(c.device_pub_key, temp);
/* Calculate the shared secret seed. */
X25519(secret_seed, temp, rma_test_server_x25519_public_key);
}
/* Encode the challenge */
if (base32_encode(challenge, sizeof(challenge), cptr, 8 * sizeof(c), 9))
return 1;
/*
* Auth code is a truncated HMAC of the ephemeral public key, BoardID,
* and DeviceID. Those are all in the right order in the challenge
* struct, after the version/key id byte.
*/
hmac_SHA256(temp, secret_seed, sizeof(secret_seed), cptr + 1,
sizeof(c) - 1);
if (base32_encode(authcode, sizeof(authcode), temp,
RMA_AUTHCODE_CHARS * 5, 0))
return 1;
return 0;
}
int rma_try_authcode(const char *code)
{
return safe_memcmp(authcode, code, RMA_AUTHCODE_CHARS);
}
static void dump_key(const char *title, const uint8_t *key, size_t key_size)
{
size_t i;
const int bytes_per_line = 8;
printf("\n\n\%s\n", title);
for (i = 0; i < key_size; i++)
printf("%02x%c", key[i],
((i + 1) % bytes_per_line) ? ' ' : '\n');
if (i % bytes_per_line)
printf("\n");
}
static void print_params(int p_flag)
{
int i;
const uint8_t *priv_key;
const uint8_t *pub_key;
int key_id;
size_t pub_key_size;
printf("\nBoard Id:\n");
for (i = 0; i < 4; i++)
printf("%c ", board_id[i]);
printf("\n\nDevice Id:\n");
for (i = 0; i < 3; i++)
printf("%c ", device_id[i]);
for (i = 3; i < 8; i++)
printf("%02x ", device_id[i]);
if (p_flag) {
priv_key = rma_test_server_p256_private_key;
pub_key = rma_test_server_p256_public_key;
pub_key_size = sizeof(rma_test_server_p256_public_key);
key_id = RMA_TEST_SERVER_P256_KEY_ID;
} else {
priv_key = rma_test_server_x25519_private_key;
pub_key = rma_test_server_x25519_public_key;
pub_key_size = sizeof(rma_test_server_x25519_public_key);
key_id = RMA_TEST_SERVER_X25519_KEY_ID;
}
printf("\n\nServer Key Id:\n");
printf("%02x", key_id);
/* Both private keys are of the same size */
dump_key("Server Private Key:", priv_key, EC_PRIV_KEY_SZ);
dump_key("Server Public Key:", pub_key, pub_key_size);
printf("\nChallenge:\n");
for (i = 0; i < RMA_CHALLENGE_CHARS; i++) {
printf("%c", challenge[i]);
if (((i + 1) % 5) == 0)
printf(" ");
if (((i + 1) % 40) == 0)
printf("\n");
}
printf("\nAuthorization Code:\n");
for (i = 0; i < RMA_AUTHCODE_BUF_SIZE; i++)
printf("%c", authcode[i]);
printf("\n\nChallenge String:\n");
printf("%s?challenge=", SERVER_ADDRESS);
for (i = 0; i < RMA_CHALLENGE_CHARS; i++)
printf("%c", challenge[i]);
printf("&hwid=%s\n", hw_id);
printf("\n");
}
static void usage(void)
{
printf("\nUsage: %s [--p256] --key_id <arg> --board_id <arg> "
"--device_id <arg> --hw_id <arg> |\n"
" --auth_code <arg> |\n"
" --challenge <arg>\n"
"\n"
"This is used to generate the cr50 or server responses for rma "
"open.\n"
"The cr50 side can be used to generate a challenge response "
"and sends authoriztion code to reset device.\n"
"The server side can generate an authcode from cr50's "
"rma challenge.\n"
"\n"
" -c,--challenge The challenge generated by cr50\n"
" -k,--key_id Index of the server private key\n"
" -b,--board_id BoardID type field\n"
" -d,--device_id Device-unique identifier\n"
" -a,--auth_code Reset authorization code\n"
" -w,--hw_id Hardware id\n"
" -h,--help Show this message\n"
" -p,--p256 Use prime256v1 curve instead of x25519\n"
" -t,--test "
"Generate challenge using default test inputs\n"
"\n",
progname);
}
static int atoh(char *v)
{
char hn;
char ln;
hn = toupper(*v);
ln = toupper(*(v + 1));
hn -= (isdigit(hn) ? '0' : '7');
ln -= (isdigit(ln) ? '0' : '7');
if ((hn < 0 || hn > 0xf) || (ln < 0 || ln > 0xf))
return 0;
return (hn << 4) | ln;
}
static int set_server_key_id(char *id)
{
/* verify length */
if (strlen(id) != 2)
return 1;
/* verify digits */
if (!isxdigit(*id) || !isxdigit(*(id + 1)))
return 1;
server_key_id = atoh(id);
return 0;
}
static int set_board_id(char *id)
{
int i;
/* verify length */
if (strlen(id) != 8)
return 1;
/* verify digits */
for (i = 0; i < 8; i++)
if (!isxdigit(*(id + i)))
return 1;
for (i = 0; i < 4; i++)
board_id[i] = atoh((id + (i * 2)));
return 0;
}
static int set_device_id(char *id)
{
int i;
/* verify length */
if (strlen(id) != 16)
return 1;
for (i = 0; i < 16; i++)
if (!isxdigit(*(id + i)))
return 1;
for (i = 0; i < 8; i++)
device_id[i] = atoh((id + (i * 2)));
return 0;
}
static int set_hw_id(char *id)
{
int i;
int len;
len = strlen(id);
if (len > 20)
len = 20;
for (i = 0; i < 20; i++)
hw_id[i] = *(id + i);
return 0;
}
static int set_auth_code(char *code)
{
int i;
if (strlen(code) != 8)
return 1;
for (i = 0; i < 8; i++)
authcode[i] = *(code + i);
authcode[i] = 0;
return 0;
}
int main(int argc, char **argv)
{
int a_flag = 0;
int b_flag = 0;
int d_flag = 0;
int k_flag = 0;
int p_flag = 0;
int t_flag = 0;
int w_flag = 0;
int i;
progname = strrchr(argv[0], '/');
if (progname)
progname++;
else
progname = argv[0];
opterr = 0;
while ((i = getopt_long(argc, argv, short_opts, long_opts, 0)) != -1) {
switch (i) {
case 't':
t_flag = 1;
break;
case 'c':
return rma_server_side(optarg);
case 'k':
if (set_server_key_id(optarg)) {
printf("Malformed key id\n");
return 1;
}
k_flag = 1;
break;
case 'b':
if (set_board_id(optarg)) {
printf("Malformed board id\n");
return 1;
}
b_flag = 1;
break;
case 'd':
if (set_device_id(optarg)) {
printf("Malformed device id\n");
return 1;
}
d_flag = 1;
break;
case 'a':
if (set_auth_code(optarg)) {
printf("Malformed authorization code\n");
return 1;
}
a_flag = 1;
break;
case 'w':
if (set_hw_id(optarg)) {
printf("Malformed hardware id\n");
return 1;
}
w_flag = 1;
break;
case 'h':
usage();
return 0;
case 0: /* auto-handled option */
break;
case '?':
if (optopt)
printf("Unrecognized option: -%c\n", optopt);
else
printf("Unrecognized option: %s\n",
argv[optind - 1]);
break;
case ':':
printf("Missing argument to %s\n", argv[optind - 1]);
break;
case 'p':
p_flag = 1;
server_key_id = RMA_TEST_SERVER_P256_KEY_ID;
break;
default:
printf("Internal error at %s:%d\n", __FILE__, __LINE__);
return 1;
}
}
if (a_flag) {
FILE *acode;
char verify_authcode[RMA_AUTHCODE_BUF_SIZE];
int rv;
acode = fopen("/tmp/authcode", "r");
if (acode == NULL) {
printf("Please generate challenge\n");
return 1;
}
rv = fread(verify_authcode, 1, RMA_AUTHCODE_BUF_SIZE, acode);
if (rv != RMA_AUTHCODE_BUF_SIZE) {
printf("Error reading saved authcode\n");
return 1;
}
if (strcmp(verify_authcode, authcode) == 0)
printf("Code Accepted\n");
else
printf("Invalid Code\n");
} else {
if (!t_flag) { /* Use default values */
if (!k_flag || !b_flag || !d_flag || !w_flag) {
printf("server-side: Flag -c is mandatory\n");
printf("cr50-side: Flags -k, -b, -d, and -w "
"are mandatory\n");
return 1;
}
}
rma_create_test_challenge(p_flag);
{
FILE *acode;
acode = fopen("/tmp/authcode", "w");
if (acode < 0)
return 1;
fwrite(authcode, 1, RMA_AUTHCODE_BUF_SIZE, acode);
fclose(acode);
}
print_params(p_flag);
}
return 0;
}
|