1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2013, Google Inc.
4 */
5
6 #include "mkimage.h"
7 #include <stdlib.h>
8 #include <stdio.h>
9 #include <string.h>
10 #include <image.h>
11 #include <time.h>
12 #include <u-boot/fdt-libcrypto.h>
13 #include <openssl/bn.h>
14 #include <openssl/ec.h>
15 #include <openssl/rsa.h>
16 #include <openssl/pem.h>
17 #include <openssl/err.h>
18 #include <openssl/ssl.h>
19 #include <openssl/evp.h>
20 #include <openssl/engine.h>
21
22 #if OPENSSL_VERSION_NUMBER >= 0x10000000L
23 #define HAVE_ERR_REMOVE_THREAD_STATE
24 #endif
25
26 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
27 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
RSA_get0_key(const RSA * r,const BIGNUM ** n,const BIGNUM ** e,const BIGNUM ** d)28 static void RSA_get0_key(const RSA *r,
29 const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
30 {
31 if (n != NULL)
32 *n = r->n;
33 if (e != NULL)
34 *e = r->e;
35 if (d != NULL)
36 *d = r->d;
37 }
38 #endif
39
rsa_err(const char * msg)40 static int rsa_err(const char *msg)
41 {
42 unsigned long sslErr = ERR_get_error();
43
44 fprintf(stderr, "%s", msg);
45 fprintf(stderr, ": %s\n",
46 ERR_error_string(sslErr, 0));
47
48 return -1;
49 }
50
51 /**
52 * rsa_pem_get_pub_key() - read a public key from a .crt file
53 *
54 * @keydir: Directory containins the key
55 * @name Name of key file (will have a .crt extension)
56 * @evpp Returns EVP_PKEY object, or NULL on failure
57 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
58 */
rsa_pem_get_pub_key(const char * keydir,const char * name,EVP_PKEY ** evpp)59 static int rsa_pem_get_pub_key(const char *keydir, const char *name, EVP_PKEY **evpp)
60 {
61 char path[1024];
62 EVP_PKEY *key = NULL;
63 X509 *cert;
64 FILE *f;
65 int ret;
66
67 if (!evpp)
68 return -EINVAL;
69
70 *evpp = NULL;
71 snprintf(path, sizeof(path), "%s/%s.crt", keydir, name);
72 f = fopen(path, "r");
73 if (!f) {
74 fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n",
75 path, strerror(errno));
76 return -EACCES;
77 }
78
79 /* Read the certificate */
80 cert = NULL;
81 if (!PEM_read_X509(f, &cert, NULL, NULL)) {
82 rsa_err("Couldn't read certificate");
83 ret = -EINVAL;
84 goto err_cert;
85 }
86
87 /* Get the public key from the certificate. */
88 key = X509_get_pubkey(cert);
89 if (!key) {
90 rsa_err("Couldn't read public key\n");
91 ret = -EINVAL;
92 goto err_pubkey;
93 }
94
95 fclose(f);
96 *evpp = key;
97 X509_free(cert);
98
99 return 0;
100
101 err_pubkey:
102 X509_free(cert);
103 err_cert:
104 fclose(f);
105 return ret;
106 }
107
108 /**
109 * rsa_engine_get_pub_key() - read a public key from given engine
110 *
111 * @keydir: Key prefix
112 * @name Name of key
113 * @engine Engine to use
114 * @evpp Returns EVP_PKEY object, or NULL on failure
115 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
116 */
rsa_engine_get_pub_key(const char * keydir,const char * name,ENGINE * engine,EVP_PKEY ** evpp)117 static int rsa_engine_get_pub_key(const char *keydir, const char *name,
118 ENGINE *engine, EVP_PKEY **evpp)
119 {
120 const char *engine_id;
121 char key_id[1024];
122 EVP_PKEY *key = NULL;
123
124 if (!evpp)
125 return -EINVAL;
126
127 *evpp = NULL;
128
129 engine_id = ENGINE_get_id(engine);
130
131 if (engine_id && !strcmp(engine_id, "pkcs11")) {
132 if (keydir)
133 if (strstr(keydir, "object="))
134 snprintf(key_id, sizeof(key_id),
135 "pkcs11:%s;type=public",
136 keydir);
137 else
138 snprintf(key_id, sizeof(key_id),
139 "pkcs11:%s;object=%s;type=public",
140 keydir, name);
141 else
142 snprintf(key_id, sizeof(key_id),
143 "pkcs11:object=%s;type=public",
144 name);
145 } else if (engine_id) {
146 if (keydir)
147 snprintf(key_id, sizeof(key_id),
148 "%s%s",
149 keydir, name);
150 else
151 snprintf(key_id, sizeof(key_id),
152 "%s",
153 name);
154 } else {
155 fprintf(stderr, "Engine not supported\n");
156 return -ENOTSUP;
157 }
158
159 key = ENGINE_load_public_key(engine, key_id, NULL, NULL);
160 if (!key)
161 return rsa_err("Failure loading public key from engine");
162
163 *evpp = key;
164
165 return 0;
166 }
167
168 /**
169 * rsa_get_pub_key() - read a public key
170 *
171 * @keydir: Directory containing the key (PEM file) or key prefix (engine)
172 * @name Name of key file (will have a .crt extension)
173 * @engine Engine to use
174 * @evpp Returns EVP_PKEY object, or NULL on failure
175 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
176 */
rsa_get_pub_key(const char * keydir,const char * name,ENGINE * engine,EVP_PKEY ** evpp)177 static int rsa_get_pub_key(const char *keydir, const char *name,
178 ENGINE *engine, EVP_PKEY **evpp)
179 {
180 if (engine)
181 return rsa_engine_get_pub_key(keydir, name, engine, evpp);
182 return rsa_pem_get_pub_key(keydir, name, evpp);
183 }
184
185 /**
186 * rsa_pem_get_priv_key() - read a private key from a .key file
187 *
188 * @keydir: Directory containing the key
189 * @name Name of key file (will have a .key extension)
190 * @evpp Returns EVP_PKEY object, or NULL on failure
191 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
192 */
rsa_pem_get_priv_key(const char * keydir,const char * name,const char * keyfile,EVP_PKEY ** evpp)193 static int rsa_pem_get_priv_key(const char *keydir, const char *name,
194 const char *keyfile, EVP_PKEY **evpp)
195 {
196 char path[1024] = {0};
197 FILE *f = NULL;
198
199 if (!evpp)
200 return -EINVAL;
201
202 *evpp = NULL;
203 if (keydir && name)
204 snprintf(path, sizeof(path), "%s/%s.key", keydir, name);
205 else if (keyfile)
206 snprintf(path, sizeof(path), "%s", keyfile);
207 else
208 return -EINVAL;
209
210 f = fopen(path, "r");
211 if (!f) {
212 fprintf(stderr, "Couldn't open RSA private key: '%s': %s\n",
213 path, strerror(errno));
214 return -ENOENT;
215 }
216
217 if (!PEM_read_PrivateKey(f, evpp, NULL, path)) {
218 rsa_err("Failure reading private key");
219 fclose(f);
220 return -EPROTO;
221 }
222 fclose(f);
223
224 return 0;
225 }
226
227 /**
228 * rsa_engine_get_priv_key() - read a private key from given engine
229 *
230 * @keydir: Key prefix
231 * @name Name of key
232 * @engine Engine to use
233 * @evpp Returns EVP_PKEY object, or NULL on failure
234 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
235 */
rsa_engine_get_priv_key(const char * keydir,const char * name,const char * keyfile,ENGINE * engine,EVP_PKEY ** evpp)236 static int rsa_engine_get_priv_key(const char *keydir, const char *name,
237 const char *keyfile,
238 ENGINE *engine, EVP_PKEY **evpp)
239 {
240 const char *engine_id;
241 char key_id[1024];
242 EVP_PKEY *key = NULL;
243
244 if (!evpp)
245 return -EINVAL;
246
247 engine_id = ENGINE_get_id(engine);
248
249 if (engine_id && !strcmp(engine_id, "pkcs11")) {
250 if (!keydir && !name) {
251 fprintf(stderr, "Please use 'keydir' with PKCS11\n");
252 return -EINVAL;
253 }
254 if (keydir)
255 if (strstr(keydir, "object="))
256 snprintf(key_id, sizeof(key_id),
257 "pkcs11:%s;type=private",
258 keydir);
259 else
260 snprintf(key_id, sizeof(key_id),
261 "pkcs11:%s;object=%s;type=private",
262 keydir, name);
263 else
264 snprintf(key_id, sizeof(key_id),
265 "pkcs11:object=%s;type=private",
266 name);
267 } else if (engine_id) {
268 if (keydir && name)
269 snprintf(key_id, sizeof(key_id),
270 "%s%s",
271 keydir, name);
272 else if (keydir)
273 snprintf(key_id, sizeof(key_id),
274 "%s",
275 name);
276 else if (keyfile)
277 snprintf(key_id, sizeof(key_id), "%s", keyfile);
278 else
279 return -EINVAL;
280
281 } else {
282 fprintf(stderr, "Engine not supported\n");
283 return -ENOTSUP;
284 }
285
286 key = ENGINE_load_private_key(engine, key_id, NULL, NULL);
287 if (!key)
288 return rsa_err("Failure loading private key from engine");
289
290 *evpp = key;
291
292 return 0;
293 }
294
295 /**
296 * rsa_get_priv_key() - read a private key
297 *
298 * @keydir: Directory containing the key (PEM file) or key prefix (engine)
299 * @name Name of key
300 * @engine Engine to use for signing
301 * @evpp Returns EVP_PKEY object, or NULL on failure
302 * @return 0 if ok, -ve on error (in which case *evpp will be set to NULL)
303 */
rsa_get_priv_key(const char * keydir,const char * name,const char * keyfile,ENGINE * engine,EVP_PKEY ** evpp)304 static int rsa_get_priv_key(const char *keydir, const char *name,
305 const char *keyfile, ENGINE *engine, EVP_PKEY **evpp)
306 {
307 if (engine)
308 return rsa_engine_get_priv_key(keydir, name, keyfile, engine,
309 evpp);
310 return rsa_pem_get_priv_key(keydir, name, keyfile, evpp);
311 }
312
rsa_init(void)313 static int rsa_init(void)
314 {
315 int ret;
316
317 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
318 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
319 ret = SSL_library_init();
320 #else
321 ret = OPENSSL_init_ssl(0, NULL);
322 #endif
323 if (!ret) {
324 fprintf(stderr, "Failure to init SSL library\n");
325 return -1;
326 }
327 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
328 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
329 SSL_load_error_strings();
330
331 OpenSSL_add_all_algorithms();
332 OpenSSL_add_all_digests();
333 OpenSSL_add_all_ciphers();
334 #endif
335
336 return 0;
337 }
338
rsa_engine_init(const char * engine_id,ENGINE ** pe)339 static int rsa_engine_init(const char *engine_id, ENGINE **pe)
340 {
341 ENGINE *e;
342 int ret;
343
344 ENGINE_load_builtin_engines();
345
346 e = ENGINE_by_id(engine_id);
347 if (!e) {
348 fprintf(stderr, "Engine isn't available\n");
349 ret = -1;
350 goto err_engine_by_id;
351 }
352
353 if (!ENGINE_init(e)) {
354 fprintf(stderr, "Couldn't initialize engine\n");
355 ret = -1;
356 goto err_engine_init;
357 }
358
359 if (!ENGINE_set_default_RSA(e)) {
360 fprintf(stderr, "Couldn't set engine as default for RSA\n");
361 ret = -1;
362 goto err_set_rsa;
363 }
364
365 *pe = e;
366
367 return 0;
368
369 err_set_rsa:
370 ENGINE_finish(e);
371 err_engine_init:
372 ENGINE_free(e);
373 err_engine_by_id:
374 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
375 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
376 ENGINE_cleanup();
377 #endif
378 return ret;
379 }
380
rsa_remove(void)381 static void rsa_remove(void)
382 {
383 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
384 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
385 CRYPTO_cleanup_all_ex_data();
386 ERR_free_strings();
387 #ifdef HAVE_ERR_REMOVE_THREAD_STATE
388 ERR_remove_thread_state(NULL);
389 #else
390 ERR_remove_state(0);
391 #endif
392 EVP_cleanup();
393 #endif
394 }
395
rsa_engine_remove(ENGINE * e)396 static void rsa_engine_remove(ENGINE *e)
397 {
398 if (e) {
399 ENGINE_finish(e);
400 ENGINE_free(e);
401 }
402 }
403
rsa_sign_with_key(EVP_PKEY * pkey,struct padding_algo * padding_algo,struct checksum_algo * checksum_algo,const struct image_region region[],int region_count,uint8_t ** sigp,uint * sig_size)404 static int rsa_sign_with_key(EVP_PKEY *pkey, struct padding_algo *padding_algo,
405 struct checksum_algo *checksum_algo,
406 const struct image_region region[], int region_count,
407 uint8_t **sigp, uint *sig_size)
408 {
409 EVP_PKEY_CTX *ckey;
410 EVP_MD_CTX *context;
411 int ret = 0;
412 size_t size;
413 uint8_t *sig;
414 int i;
415
416 size = EVP_PKEY_size(pkey);
417 sig = malloc(size);
418 if (!sig) {
419 fprintf(stderr, "Out of memory for signature (%zu bytes)\n",
420 size);
421 ret = -ENOMEM;
422 goto err_alloc;
423 }
424
425 context = EVP_MD_CTX_create();
426 if (!context) {
427 ret = rsa_err("EVP context creation failed");
428 goto err_create;
429 }
430 EVP_MD_CTX_init(context);
431
432 ckey = EVP_PKEY_CTX_new(pkey, NULL);
433 if (!ckey) {
434 ret = rsa_err("EVP key context creation failed");
435 goto err_create;
436 }
437
438 if (EVP_DigestSignInit(context, &ckey,
439 checksum_algo->calculate_sign(),
440 NULL, pkey) <= 0) {
441 ret = rsa_err("Signer setup failed");
442 goto err_sign;
443 }
444
445 #ifdef CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT
446 if (padding_algo && !strcmp(padding_algo->name, "pss")) {
447 if (EVP_PKEY_CTX_set_rsa_padding(ckey,
448 RSA_PKCS1_PSS_PADDING) <= 0) {
449 ret = rsa_err("Signer padding setup failed");
450 goto err_sign;
451 }
452 }
453 #endif /* CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT */
454
455 for (i = 0; i < region_count; i++) {
456 if (!EVP_DigestSignUpdate(context, region[i].data,
457 region[i].size)) {
458 ret = rsa_err("Signing data failed");
459 goto err_sign;
460 }
461 }
462
463 if (!EVP_DigestSignFinal(context, sig, &size)) {
464 ret = rsa_err("Could not obtain signature");
465 goto err_sign;
466 }
467
468 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
469 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
470 EVP_MD_CTX_cleanup(context);
471 #else
472 EVP_MD_CTX_reset(context);
473 #endif
474 EVP_MD_CTX_destroy(context);
475
476 debug("Got signature: %d bytes, expected %zu\n", *sig_size, size);
477 *sigp = sig;
478 *sig_size = size;
479
480 return 0;
481
482 err_sign:
483 EVP_MD_CTX_destroy(context);
484 err_create:
485 free(sig);
486 err_alloc:
487 return ret;
488 }
489
rsa_sign(struct image_sign_info * info,const struct image_region region[],int region_count,uint8_t ** sigp,uint * sig_len)490 int rsa_sign(struct image_sign_info *info,
491 const struct image_region region[], int region_count,
492 uint8_t **sigp, uint *sig_len)
493 {
494 EVP_PKEY *pkey = NULL;
495 ENGINE *e = NULL;
496 int ret;
497
498 ret = rsa_init();
499 if (ret)
500 return ret;
501
502 if (info->engine_id) {
503 ret = rsa_engine_init(info->engine_id, &e);
504 if (ret)
505 goto err_engine;
506 }
507
508 ret = rsa_get_priv_key(info->keydir, info->keyname, info->keyfile,
509 e, &pkey);
510 if (ret)
511 goto err_priv;
512 ret = rsa_sign_with_key(pkey, info->padding, info->checksum, region,
513 region_count, sigp, sig_len);
514 if (ret)
515 goto err_sign;
516
517 EVP_PKEY_free(pkey);
518 if (info->engine_id)
519 rsa_engine_remove(e);
520 rsa_remove();
521
522 return ret;
523
524 err_sign:
525 EVP_PKEY_free(pkey);
526 err_priv:
527 if (info->engine_id)
528 rsa_engine_remove(e);
529 err_engine:
530 rsa_remove();
531 return ret;
532 }
533
534 /*
535 * rsa_get_exponent(): - Get the public exponent from an RSA key
536 */
rsa_get_exponent(RSA * key,uint64_t * e)537 static int rsa_get_exponent(RSA *key, uint64_t *e)
538 {
539 int ret;
540 BIGNUM *bn_te;
541 const BIGNUM *key_e;
542 uint64_t te;
543
544 ret = -EINVAL;
545 bn_te = NULL;
546
547 if (!e)
548 goto cleanup;
549
550 RSA_get0_key(key, NULL, &key_e, NULL);
551 if (BN_num_bits(key_e) > 64)
552 goto cleanup;
553
554 *e = BN_get_word(key_e);
555
556 if (BN_num_bits(key_e) < 33) {
557 ret = 0;
558 goto cleanup;
559 }
560
561 bn_te = BN_dup(key_e);
562 if (!bn_te)
563 goto cleanup;
564
565 if (!BN_rshift(bn_te, bn_te, 32))
566 goto cleanup;
567
568 if (!BN_mask_bits(bn_te, 32))
569 goto cleanup;
570
571 te = BN_get_word(bn_te);
572 te <<= 32;
573 *e |= te;
574 ret = 0;
575
576 cleanup:
577 if (bn_te)
578 BN_free(bn_te);
579
580 return ret;
581 }
582
583 /*
584 * rsa_get_params(): - Get the important parameters of an RSA public key
585 */
rsa_get_params(RSA * key,uint64_t * exponent,uint32_t * n0_invp,BIGNUM ** modulusp,BIGNUM ** r_squaredp)586 int rsa_get_params(RSA *key, uint64_t *exponent, uint32_t *n0_invp,
587 BIGNUM **modulusp, BIGNUM **r_squaredp)
588 {
589 BIGNUM *big1, *big2, *big32, *big2_32;
590 BIGNUM *n, *r, *r_squared, *tmp;
591 const BIGNUM *key_n;
592 BN_CTX *bn_ctx = BN_CTX_new();
593 int ret = 0;
594
595 /* Initialize BIGNUMs */
596 big1 = BN_new();
597 big2 = BN_new();
598 big32 = BN_new();
599 r = BN_new();
600 r_squared = BN_new();
601 tmp = BN_new();
602 big2_32 = BN_new();
603 n = BN_new();
604 if (!big1 || !big2 || !big32 || !r || !r_squared || !tmp || !big2_32 ||
605 !n) {
606 fprintf(stderr, "Out of memory (bignum)\n");
607 return -ENOMEM;
608 }
609
610 if (0 != rsa_get_exponent(key, exponent))
611 ret = -1;
612
613 RSA_get0_key(key, &key_n, NULL, NULL);
614 if (!BN_copy(n, key_n) || !BN_set_word(big1, 1L) ||
615 !BN_set_word(big2, 2L) || !BN_set_word(big32, 32L))
616 ret = -1;
617
618 /* big2_32 = 2^32 */
619 if (!BN_exp(big2_32, big2, big32, bn_ctx))
620 ret = -1;
621
622 /* Calculate n0_inv = -1 / n[0] mod 2^32 */
623 if (!BN_mod_inverse(tmp, n, big2_32, bn_ctx) ||
624 !BN_sub(tmp, big2_32, tmp))
625 ret = -1;
626 *n0_invp = BN_get_word(tmp);
627
628 /* Calculate R = 2^(# of key bits) */
629 if (!BN_set_word(tmp, BN_num_bits(n)) ||
630 !BN_exp(r, big2, tmp, bn_ctx))
631 ret = -1;
632
633 /* Calculate r_squared = R^2 mod n */
634 if (!BN_copy(r_squared, r) ||
635 !BN_mul(tmp, r_squared, r, bn_ctx) ||
636 !BN_mod(r_squared, tmp, n, bn_ctx))
637 ret = -1;
638
639 *modulusp = n;
640 *r_squaredp = r_squared;
641
642 BN_free(big1);
643 BN_free(big2);
644 BN_free(big32);
645 BN_free(r);
646 BN_free(tmp);
647 BN_free(big2_32);
648 if (ret) {
649 fprintf(stderr, "Bignum operations failed\n");
650 return -ENOMEM;
651 }
652
653 return ret;
654 }
655
rsa_add_verify_data(struct image_sign_info * info,void * keydest)656 int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
657 {
658 BIGNUM *modulus, *r_squared;
659 uint64_t exponent;
660 uint32_t n0_inv;
661 int parent, node;
662 char name[100];
663 int ret;
664 int bits;
665 RSA *rsa;
666 EVP_PKEY *pkey = NULL;
667 ENGINE *e = NULL;
668
669 debug("%s: Getting verification data\n", __func__);
670 if (info->engine_id) {
671 ret = rsa_engine_init(info->engine_id, &e);
672 if (ret)
673 return ret;
674 }
675 ret = rsa_get_pub_key(info->keydir, info->keyname, e, &pkey);
676 if (ret)
677 goto err_get_pub_key;
678 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
679 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
680 rsa = EVP_PKEY_get1_RSA(pkey);
681 #else
682 rsa = EVP_PKEY_get0_RSA(pkey);
683 #endif
684 ret = rsa_get_params(rsa, &exponent, &n0_inv, &modulus, &r_squared);
685 if (ret)
686 goto err_get_params;
687 bits = BN_num_bits(modulus);
688 parent = fdt_subnode_offset(keydest, 0, FIT_SIG_NODENAME);
689 if (parent == -FDT_ERR_NOTFOUND) {
690 parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME);
691 if (parent < 0) {
692 ret = parent;
693 if (ret != -FDT_ERR_NOSPACE) {
694 fprintf(stderr, "Couldn't create signature node: %s\n",
695 fdt_strerror(parent));
696 }
697 }
698 }
699 if (ret)
700 goto done;
701
702 /* Either create or overwrite the named key node */
703 snprintf(name, sizeof(name), "key-%s", info->keyname);
704 node = fdt_subnode_offset(keydest, parent, name);
705 if (node == -FDT_ERR_NOTFOUND) {
706 node = fdt_add_subnode(keydest, parent, name);
707 if (node < 0) {
708 ret = node;
709 if (ret != -FDT_ERR_NOSPACE) {
710 fprintf(stderr, "Could not create key subnode: %s\n",
711 fdt_strerror(node));
712 }
713 }
714 } else if (node < 0) {
715 fprintf(stderr, "Cannot select keys parent: %s\n",
716 fdt_strerror(node));
717 ret = node;
718 }
719
720 if (!ret) {
721 ret = fdt_setprop_string(keydest, node, FIT_KEY_HINT,
722 info->keyname);
723 }
724 if (!ret)
725 ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits);
726 if (!ret)
727 ret = fdt_setprop_u32(keydest, node, "rsa,n0-inverse", n0_inv);
728 if (!ret) {
729 ret = fdt_setprop_u64(keydest, node, "rsa,exponent", exponent);
730 }
731 if (!ret) {
732 ret = fdt_add_bignum(keydest, node, "rsa,modulus", modulus,
733 bits);
734 }
735 if (!ret) {
736 ret = fdt_add_bignum(keydest, node, "rsa,r-squared", r_squared,
737 bits);
738 }
739 if (!ret) {
740 ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP,
741 info->name);
742 }
743 if (!ret && info->require_keys) {
744 ret = fdt_setprop_string(keydest, node, FIT_KEY_REQUIRED,
745 info->require_keys);
746 }
747 done:
748 BN_free(modulus);
749 BN_free(r_squared);
750 if (ret)
751 ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
752 err_get_params:
753 #if OPENSSL_VERSION_NUMBER < 0x10100000L || \
754 (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
755 RSA_free(rsa);
756 #endif
757 EVP_PKEY_free(pkey);
758 err_get_pub_key:
759 if (info->engine_id)
760 rsa_engine_remove(e);
761
762 return ret;
763 }
764