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192.168.1.100 / R306 / 2dbc1526a2b84342aa5d5d2a0b7c25c960d13710 / . / ap / lib / libssl / openssl-1.1.1o / crypto / rsa / rsa_ameth.c
blob: fb045544a832fbafed31132daaa06fae82724f26 [file] [log] [blame]
yuezonghe824eb0c2024-06-27 02:32:26 -0700[diff] [blame]1/*
2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/asn1t.h>
13#include <openssl/x509.h>
14#include <openssl/bn.h>
15#include <openssl/cms.h>
16#include "crypto/asn1.h"
17#include "crypto/evp.h"
18#include "rsa_local.h"
19
20#ifndef OPENSSL_NO_CMS
21static int rsa_cms_sign(CMS_SignerInfo *si);
22static int rsa_cms_verify(CMS_SignerInfo *si);
23static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
24static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
25#endif
26
27static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
28
29/* Set any parameters associated with pkey */
30static int rsa_param_encode(const EVP_PKEY *pkey,
31 ASN1_STRING **pstr, int *pstrtype)
32{
33 const RSA *rsa = pkey->pkey.rsa;
34
35 *pstr = NULL;
36 /* If RSA it's just NULL type */
37 if (pkey->ameth->pkey_id != EVP_PKEY_RSA_PSS) {
38 *pstrtype = V_ASN1_NULL;
39 return 1;
40 }
41 /* If no PSS parameters we omit parameters entirely */
42 if (rsa->pss == NULL) {
43 *pstrtype = V_ASN1_UNDEF;
44 return 1;
45 }
46 /* Encode PSS parameters */
47 if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL)
48 return 0;
49
50 *pstrtype = V_ASN1_SEQUENCE;
51 return 1;
52}
53/* Decode any parameters and set them in RSA structure */
54static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
55{
56 const ASN1_OBJECT *algoid;
57 const void *algp;
58 int algptype;
59
60 X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
61 if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
62 return 1;
63 if (algptype == V_ASN1_UNDEF)
64 return 1;
65 if (algptype != V_ASN1_SEQUENCE) {
66 RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS);
67 return 0;
68 }
69 rsa->pss = rsa_pss_decode(alg);
70 if (rsa->pss == NULL)
71 return 0;
72 return 1;
73}
74
75static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
76{
77 unsigned char *penc = NULL;
78 int penclen;
79 ASN1_STRING *str;
80 int strtype;
81
82 if (!rsa_param_encode(pkey, &str, &strtype))
83 return 0;
84 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
85 if (penclen <= 0)
86 return 0;
87 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
88 strtype, str, penc, penclen))
89 return 1;
90
91 OPENSSL_free(penc);
92 return 0;
93}
94
95static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
96{
97 const unsigned char *p;
98 int pklen;
99 X509_ALGOR *alg;
100 RSA *rsa = NULL;
101
102 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
103 return 0;
104 if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
105 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
106 return 0;
107 }
108 if (!rsa_param_decode(rsa, alg)) {
109 RSA_free(rsa);
110 return 0;
111 }
112 if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) {
113 RSA_free(rsa);
114 return 0;
115 }
116 return 1;
117}
118
119static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
120{
121 /*
122 * Don't check the public/private key, this is mostly for smart
123 * cards.
124 */
125 if (((RSA_flags(a->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK))
126 || (RSA_flags(b->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK)) {
127 return 1;
128 }
129
130 if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
131 || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
132 return 0;
133 return 1;
134}
135
136static int old_rsa_priv_decode(EVP_PKEY *pkey,
137 const unsigned char **pder, int derlen)
138{
139 RSA *rsa;
140
141 if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
142 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
143 return 0;
144 }
145 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
146 return 1;
147}
148
149static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
150{
151 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
152}
153
154static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
155{
156 unsigned char *rk = NULL;
157 int rklen;
158 ASN1_STRING *str;
159 int strtype;
160
161 if (!rsa_param_encode(pkey, &str, &strtype))
162 return 0;
163 rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
164
165 if (rklen <= 0) {
166 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
167 ASN1_STRING_free(str);
168 return 0;
169 }
170
171 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
172 strtype, str, rk, rklen)) {
173 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
174 ASN1_STRING_free(str);
175 return 0;
176 }
177
178 return 1;
179}
180
181static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
182{
183 const unsigned char *p;
184 RSA *rsa;
185 int pklen;
186 const X509_ALGOR *alg;
187
188 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8))
189 return 0;
190 rsa = d2i_RSAPrivateKey(NULL, &p, pklen);
191 if (rsa == NULL) {
192 RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
193 return 0;
194 }
195 if (!rsa_param_decode(rsa, alg)) {
196 RSA_free(rsa);
197 return 0;
198 }
199 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
200 return 1;
201}
202
203static int int_rsa_size(const EVP_PKEY *pkey)
204{
205 return RSA_size(pkey->pkey.rsa);
206}
207
208static int rsa_bits(const EVP_PKEY *pkey)
209{
210 return BN_num_bits(pkey->pkey.rsa->n);
211}
212
213static int rsa_security_bits(const EVP_PKEY *pkey)
214{
215 return RSA_security_bits(pkey->pkey.rsa);
216}
217
218static void int_rsa_free(EVP_PKEY *pkey)
219{
220 RSA_free(pkey->pkey.rsa);
221}
222
223static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
224{
225 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
226 return NULL;
227 return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
228 alg->parameter);
229}
230
231static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss,
232 int indent)
233{
234 int rv = 0;
235 X509_ALGOR *maskHash = NULL;
236
237 if (!BIO_indent(bp, indent, 128))
238 goto err;
239 if (pss_key) {
240 if (pss == NULL) {
241 if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
242 return 0;
243 return 1;
244 } else {
245 if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
246 return 0;
247 }
248 } else if (pss == NULL) {
249 if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
250 return 0;
251 return 1;
252 }
253 if (BIO_puts(bp, "\n") <= 0)
254 goto err;
255 if (pss_key)
256 indent += 2;
257 if (!BIO_indent(bp, indent, 128))
258 goto err;
259 if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
260 goto err;
261
262 if (pss->hashAlgorithm) {
263 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
264 goto err;
265 } else if (BIO_puts(bp, "sha1 (default)") <= 0) {
266 goto err;
267 }
268
269 if (BIO_puts(bp, "\n") <= 0)
270 goto err;
271
272 if (!BIO_indent(bp, indent, 128))
273 goto err;
274
275 if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
276 goto err;
277 if (pss->maskGenAlgorithm) {
278 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
279 goto err;
280 if (BIO_puts(bp, " with ") <= 0)
281 goto err;
282 maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
283 if (maskHash != NULL) {
284 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
285 goto err;
286 } else if (BIO_puts(bp, "INVALID") <= 0) {
287 goto err;
288 }
289 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
290 goto err;
291 }
292 BIO_puts(bp, "\n");
293
294 if (!BIO_indent(bp, indent, 128))
295 goto err;
296 if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
297 goto err;
298 if (pss->saltLength) {
299 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
300 goto err;
301 } else if (BIO_puts(bp, "14 (default)") <= 0) {
302 goto err;
303 }
304 BIO_puts(bp, "\n");
305
306 if (!BIO_indent(bp, indent, 128))
307 goto err;
308 if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
309 goto err;
310 if (pss->trailerField) {
311 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
312 goto err;
313 } else if (BIO_puts(bp, "BC (default)") <= 0) {
314 goto err;
315 }
316 BIO_puts(bp, "\n");
317
318 rv = 1;
319
320 err:
321 X509_ALGOR_free(maskHash);
322 return rv;
323
324}
325
326static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
327{
328 const RSA *x = pkey->pkey.rsa;
329 char *str;
330 const char *s;
331 int ret = 0, mod_len = 0, ex_primes;
332
333 if (x->n != NULL)
334 mod_len = BN_num_bits(x->n);
335 ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos);
336
337 if (!BIO_indent(bp, off, 128))
338 goto err;
339
340 if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0)
341 goto err;
342
343 if (priv && x->d) {
344 if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n",
345 mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0)
346 goto err;
347 str = "modulus:";
348 s = "publicExponent:";
349 } else {
350 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
351 goto err;
352 str = "Modulus:";
353 s = "Exponent:";
354 }
355 if (!ASN1_bn_print(bp, str, x->n, NULL, off))
356 goto err;
357 if (!ASN1_bn_print(bp, s, x->e, NULL, off))
358 goto err;
359 if (priv) {
360 int i;
361
362 if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
363 goto err;
364 if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
365 goto err;
366 if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
367 goto err;
368 if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
369 goto err;
370 if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
371 goto err;
372 if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
373 goto err;
374 for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) {
375 /* print multi-prime info */
376 BIGNUM *bn = NULL;
377 RSA_PRIME_INFO *pinfo;
378 int j;
379
380 pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i);
381 for (j = 0; j < 3; j++) {
382 if (!BIO_indent(bp, off, 128))
383 goto err;
384 switch (j) {
385 case 0:
386 if (BIO_printf(bp, "prime%d:", i + 3) <= 0)
387 goto err;
388 bn = pinfo->r;
389 break;
390 case 1:
391 if (BIO_printf(bp, "exponent%d:", i + 3) <= 0)
392 goto err;
393 bn = pinfo->d;
394 break;
395 case 2:
396 if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0)
397 goto err;
398 bn = pinfo->t;
399 break;
400 default:
401 break;
402 }
403 if (!ASN1_bn_print(bp, "", bn, NULL, off))
404 goto err;
405 }
406 }
407 }
408 if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
409 goto err;
410 ret = 1;
411 err:
412 return ret;
413}
414
415static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
416 ASN1_PCTX *ctx)
417{
418 return pkey_rsa_print(bp, pkey, indent, 0);
419}
420
421static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
422 ASN1_PCTX *ctx)
423{
424 return pkey_rsa_print(bp, pkey, indent, 1);
425}
426
427static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
428{
429 RSA_PSS_PARAMS *pss;
430
431 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
432 alg->parameter);
433
434 if (pss == NULL)
435 return NULL;
436
437 if (pss->maskGenAlgorithm != NULL) {
438 pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
439 if (pss->maskHash == NULL) {
440 RSA_PSS_PARAMS_free(pss);
441 return NULL;
442 }
443 }
444
445 return pss;
446}
447
448static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
449 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
450{
451 if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
452 int rv;
453 RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
454
455 rv = rsa_pss_param_print(bp, 0, pss, indent);
456 RSA_PSS_PARAMS_free(pss);
457 if (!rv)
458 return 0;
459 } else if (!sig && BIO_puts(bp, "\n") <= 0) {
460 return 0;
461 }
462 if (sig)
463 return X509_signature_dump(bp, sig, indent);
464 return 1;
465}
466
467static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
468{
469 X509_ALGOR *alg = NULL;
470 const EVP_MD *md;
471 const EVP_MD *mgf1md;
472 int min_saltlen;
473
474 switch (op) {
475
476 case ASN1_PKEY_CTRL_PKCS7_SIGN:
477 if (arg1 == 0)
478 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
479 break;
480
481 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
482 if (pkey_is_pss(pkey))
483 return -2;
484 if (arg1 == 0)
485 PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
486 break;
487#ifndef OPENSSL_NO_CMS
488 case ASN1_PKEY_CTRL_CMS_SIGN:
489 if (arg1 == 0)
490 return rsa_cms_sign(arg2);
491 else if (arg1 == 1)
492 return rsa_cms_verify(arg2);
493 break;
494
495 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
496 if (pkey_is_pss(pkey))
497 return -2;
498 if (arg1 == 0)
499 return rsa_cms_encrypt(arg2);
500 else if (arg1 == 1)
501 return rsa_cms_decrypt(arg2);
502 break;
503
504 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
505 if (pkey_is_pss(pkey))
506 return -2;
507 *(int *)arg2 = CMS_RECIPINFO_TRANS;
508 return 1;
509#endif
510
511 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
512 if (pkey->pkey.rsa->pss != NULL) {
513 if (!rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md,
514 &min_saltlen)) {
515 RSAerr(0, ERR_R_INTERNAL_ERROR);
516 return 0;
517 }
518 *(int *)arg2 = EVP_MD_type(md);
519 /* Return of 2 indicates this MD is mandatory */
520 return 2;
521 }
522 *(int *)arg2 = NID_sha256;
523 return 1;
524
525 default:
526 return -2;
527
528 }
529
530 if (alg)
531 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
532
533 return 1;
534
535}
536
537/* allocate and set algorithm ID from EVP_MD, default SHA1 */
538static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
539{
540 if (md == NULL || EVP_MD_type(md) == NID_sha1)
541 return 1;
542 *palg = X509_ALGOR_new();
543 if (*palg == NULL)
544 return 0;
545 X509_ALGOR_set_md(*palg, md);
546 return 1;
547}
548
549/* Allocate and set MGF1 algorithm ID from EVP_MD */
550static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
551{
552 X509_ALGOR *algtmp = NULL;
553 ASN1_STRING *stmp = NULL;
554
555 *palg = NULL;
556 if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
557 return 1;
558 /* need to embed algorithm ID inside another */
559 if (!rsa_md_to_algor(&algtmp, mgf1md))
560 goto err;
561 if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
562 goto err;
563 *palg = X509_ALGOR_new();
564 if (*palg == NULL)
565 goto err;
566 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
567 stmp = NULL;
568 err:
569 ASN1_STRING_free(stmp);
570 X509_ALGOR_free(algtmp);
571 if (*palg)
572 return 1;
573 return 0;
574}
575
576/* convert algorithm ID to EVP_MD, default SHA1 */
577static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
578{
579 const EVP_MD *md;
580
581 if (!alg)
582 return EVP_sha1();
583 md = EVP_get_digestbyobj(alg->algorithm);
584 if (md == NULL)
585 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
586 return md;
587}
588
589/*
590 * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
591 * suitable for setting an AlgorithmIdentifier.
592 */
593
594static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
595{
596 const EVP_MD *sigmd, *mgf1md;
597 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
598 int saltlen;
599
600 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
601 return NULL;
602 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
603 return NULL;
604 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
605 return NULL;
606 if (saltlen == -1) {
607 saltlen = EVP_MD_size(sigmd);
608 } else if (saltlen == -2 || saltlen == -3) {
609 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
610 if ((EVP_PKEY_bits(pk) & 0x7) == 1)
611 saltlen--;
612 if (saltlen < 0)
613 return NULL;
614 }
615
616 return rsa_pss_params_create(sigmd, mgf1md, saltlen);
617}
618
619RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
620 const EVP_MD *mgf1md, int saltlen)
621{
622 RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
623
624 if (pss == NULL)
625 goto err;
626 if (saltlen != 20) {
627 pss->saltLength = ASN1_INTEGER_new();
628 if (pss->saltLength == NULL)
629 goto err;
630 if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
631 goto err;
632 }
633 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
634 goto err;
635 if (mgf1md == NULL)
636 mgf1md = sigmd;
637 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
638 goto err;
639 if (!rsa_md_to_algor(&pss->maskHash, mgf1md))
640 goto err;
641 return pss;
642 err:
643 RSA_PSS_PARAMS_free(pss);
644 return NULL;
645}
646
647static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
648{
649 RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
650 ASN1_STRING *os;
651
652 if (pss == NULL)
653 return NULL;
654
655 os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
656 RSA_PSS_PARAMS_free(pss);
657 return os;
658}
659
660/*
661 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
662 * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
663 * passed to pkctx instead.
664 */
665
666static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
667 X509_ALGOR *sigalg, EVP_PKEY *pkey)
668{
669 int rv = -1;
670 int saltlen;
671 const EVP_MD *mgf1md = NULL, *md = NULL;
672 RSA_PSS_PARAMS *pss;
673
674 /* Sanity check: make sure it is PSS */
675 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
676 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
677 return -1;
678 }
679 /* Decode PSS parameters */
680 pss = rsa_pss_decode(sigalg);
681
682 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
683 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
684 goto err;
685 }
686
687 /* We have all parameters now set up context */
688 if (pkey) {
689 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
690 goto err;
691 } else {
692 const EVP_MD *checkmd;
693 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
694 goto err;
695 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
696 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
697 goto err;
698 }
699 }
700
701 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
702 goto err;
703
704 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
705 goto err;
706
707 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
708 goto err;
709 /* Carry on */
710 rv = 1;
711
712 err:
713 RSA_PSS_PARAMS_free(pss);
714 return rv;
715}
716
717int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
718 const EVP_MD **pmgf1md, int *psaltlen)
719{
720 if (pss == NULL)
721 return 0;
722 *pmd = rsa_algor_to_md(pss->hashAlgorithm);
723 if (*pmd == NULL)
724 return 0;
725 *pmgf1md = rsa_algor_to_md(pss->maskHash);
726 if (*pmgf1md == NULL)
727 return 0;
728 if (pss->saltLength) {
729 *psaltlen = ASN1_INTEGER_get(pss->saltLength);
730 if (*psaltlen < 0) {
731 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
732 return 0;
733 }
734 } else {
735 *psaltlen = 20;
736 }
737
738 /*
739 * low-level routines support only trailer field 0xbc (value 1) and
740 * PKCS#1 says we should reject any other value anyway.
741 */
742 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
743 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER);
744 return 0;
745 }
746
747 return 1;
748}
749
750#ifndef OPENSSL_NO_CMS
751static int rsa_cms_verify(CMS_SignerInfo *si)
752{
753 int nid, nid2;
754 X509_ALGOR *alg;
755 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
756
757 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
758 nid = OBJ_obj2nid(alg->algorithm);
759 if (nid == EVP_PKEY_RSA_PSS)
760 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
761 /* Only PSS allowed for PSS keys */
762 if (pkey_ctx_is_pss(pkctx)) {
763 RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
764 return 0;
765 }
766 if (nid == NID_rsaEncryption)
767 return 1;
768 /* Workaround for some implementation that use a signature OID */
769 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
770 if (nid2 == NID_rsaEncryption)
771 return 1;
772 }
773 return 0;
774}
775#endif
776
777/*
778 * Customised RSA item verification routine. This is called when a signature
779 * is encountered requiring special handling. We currently only handle PSS.
780 */
781
782static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
783 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
784 EVP_PKEY *pkey)
785{
786 /* Sanity check: make sure it is PSS */
787 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
788 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
789 return -1;
790 }
791 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
792 /* Carry on */
793 return 2;
794 }
795 return -1;
796}
797
798#ifndef OPENSSL_NO_CMS
799static int rsa_cms_sign(CMS_SignerInfo *si)
800{
801 int pad_mode = RSA_PKCS1_PADDING;
802 X509_ALGOR *alg;
803 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
804 ASN1_STRING *os = NULL;
805
806 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
807 if (pkctx) {
808 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
809 return 0;
810 }
811 if (pad_mode == RSA_PKCS1_PADDING) {
812 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
813 return 1;
814 }
815 /* We don't support it */
816 if (pad_mode != RSA_PKCS1_PSS_PADDING)
817 return 0;
818 os = rsa_ctx_to_pss_string(pkctx);
819 if (!os)
820 return 0;
821 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
822 return 1;
823}
824#endif
825
826static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
827 X509_ALGOR *alg1, X509_ALGOR *alg2,
828 ASN1_BIT_STRING *sig)
829{
830 int pad_mode;
831 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
832
833 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
834 return 0;
835 if (pad_mode == RSA_PKCS1_PADDING)
836 return 2;
837 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
838 ASN1_STRING *os1 = NULL;
839 os1 = rsa_ctx_to_pss_string(pkctx);
840 if (!os1)
841 return 0;
842 /* Duplicate parameters if we have to */
843 if (alg2) {
844 ASN1_STRING *os2 = ASN1_STRING_dup(os1);
845 if (!os2) {
846 ASN1_STRING_free(os1);
847 return 0;
848 }
849 X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
850 V_ASN1_SEQUENCE, os2);
851 }
852 X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
853 V_ASN1_SEQUENCE, os1);
854 return 3;
855 }
856 return 2;
857}
858
859static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
860 const ASN1_STRING *sig)
861{
862 int rv = 0;
863 int mdnid, saltlen;
864 uint32_t flags;
865 const EVP_MD *mgf1md = NULL, *md = NULL;
866 RSA_PSS_PARAMS *pss;
867
868 /* Sanity check: make sure it is PSS */
869 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
870 return 0;
871 /* Decode PSS parameters */
872 pss = rsa_pss_decode(sigalg);
873 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
874 goto err;
875 mdnid = EVP_MD_type(md);
876 /*
877 * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
878 * match and salt length must equal digest size
879 */
880 if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
881 && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
882 flags = X509_SIG_INFO_TLS;
883 else
884 flags = 0;
885 /* Note: security bits half number of digest bits */
886 X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4,
887 flags);
888 rv = 1;
889 err:
890 RSA_PSS_PARAMS_free(pss);
891 return rv;
892}
893
894#ifndef OPENSSL_NO_CMS
895static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
896{
897 RSA_OAEP_PARAMS *oaep;
898
899 oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
900 alg->parameter);
901
902 if (oaep == NULL)
903 return NULL;
904
905 if (oaep->maskGenFunc != NULL) {
906 oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
907 if (oaep->maskHash == NULL) {
908 RSA_OAEP_PARAMS_free(oaep);
909 return NULL;
910 }
911 }
912 return oaep;
913}
914
915static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
916{
917 EVP_PKEY_CTX *pkctx;
918 X509_ALGOR *cmsalg;
919 int nid;
920 int rv = -1;
921 unsigned char *label = NULL;
922 int labellen = 0;
923 const EVP_MD *mgf1md = NULL, *md = NULL;
924 RSA_OAEP_PARAMS *oaep;
925
926 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
927 if (pkctx == NULL)
928 return 0;
929 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
930 return -1;
931 nid = OBJ_obj2nid(cmsalg->algorithm);
932 if (nid == NID_rsaEncryption)
933 return 1;
934 if (nid != NID_rsaesOaep) {
935 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
936 return -1;
937 }
938 /* Decode OAEP parameters */
939 oaep = rsa_oaep_decode(cmsalg);
940
941 if (oaep == NULL) {
942 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
943 goto err;
944 }
945
946 mgf1md = rsa_algor_to_md(oaep->maskHash);
947 if (mgf1md == NULL)
948 goto err;
949 md = rsa_algor_to_md(oaep->hashFunc);
950 if (md == NULL)
951 goto err;
952
953 if (oaep->pSourceFunc != NULL) {
954 X509_ALGOR *plab = oaep->pSourceFunc;
955
956 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
957 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
958 goto err;
959 }
960 if (plab->parameter->type != V_ASN1_OCTET_STRING) {
961 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
962 goto err;
963 }
964
965 label = plab->parameter->value.octet_string->data;
966 /* Stop label being freed when OAEP parameters are freed */
967 plab->parameter->value.octet_string->data = NULL;
968 labellen = plab->parameter->value.octet_string->length;
969 }
970
971 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
972 goto err;
973 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
974 goto err;
975 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
976 goto err;
977 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
978 goto err;
979 /* Carry on */
980 rv = 1;
981
982 err:
983 RSA_OAEP_PARAMS_free(oaep);
984 return rv;
985}
986
987static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
988{
989 const EVP_MD *md, *mgf1md;
990 RSA_OAEP_PARAMS *oaep = NULL;
991 ASN1_STRING *os = NULL;
992 X509_ALGOR *alg;
993 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
994 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
995 unsigned char *label;
996
997 if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
998 return 0;
999 if (pkctx) {
1000 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
1001 return 0;
1002 }
1003 if (pad_mode == RSA_PKCS1_PADDING) {
1004 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
1005 return 1;
1006 }
1007 /* Not supported */
1008 if (pad_mode != RSA_PKCS1_OAEP_PADDING)
1009 return 0;
1010 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
1011 goto err;
1012 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
1013 goto err;
1014 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
1015 if (labellen < 0)
1016 goto err;
1017 oaep = RSA_OAEP_PARAMS_new();
1018 if (oaep == NULL)
1019 goto err;
1020 if (!rsa_md_to_algor(&oaep->hashFunc, md))
1021 goto err;
1022 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
1023 goto err;
1024 if (labellen > 0) {
1025 ASN1_OCTET_STRING *los;
1026 oaep->pSourceFunc = X509_ALGOR_new();
1027 if (oaep->pSourceFunc == NULL)
1028 goto err;
1029 los = ASN1_OCTET_STRING_new();
1030 if (los == NULL)
1031 goto err;
1032 if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
1033 ASN1_OCTET_STRING_free(los);
1034 goto err;
1035 }
1036 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
1037 V_ASN1_OCTET_STRING, los);
1038 }
1039 /* create string with pss parameter encoding. */
1040 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
1041 goto err;
1042 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
1043 os = NULL;
1044 rv = 1;
1045 err:
1046 RSA_OAEP_PARAMS_free(oaep);
1047 ASN1_STRING_free(os);
1048 return rv;
1049}
1050#endif
1051
1052static int rsa_pkey_check(const EVP_PKEY *pkey)
1053{
1054 return RSA_check_key_ex(pkey->pkey.rsa, NULL);
1055}
1056
1057const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
1058 {
1059 EVP_PKEY_RSA,
1060 EVP_PKEY_RSA,
1061 ASN1_PKEY_SIGPARAM_NULL,
1062
1063 "RSA",
1064 "OpenSSL RSA method",
1065
1066 rsa_pub_decode,
1067 rsa_pub_encode,
1068 rsa_pub_cmp,
1069 rsa_pub_print,
1070
1071 rsa_priv_decode,
1072 rsa_priv_encode,
1073 rsa_priv_print,
1074
1075 int_rsa_size,
1076 rsa_bits,
1077 rsa_security_bits,
1078
1079 0, 0, 0, 0, 0, 0,
1080
1081 rsa_sig_print,
1082 int_rsa_free,
1083 rsa_pkey_ctrl,
1084 old_rsa_priv_decode,
1085 old_rsa_priv_encode,
1086 rsa_item_verify,
1087 rsa_item_sign,
1088 rsa_sig_info_set,
1089 rsa_pkey_check
1090 },
1091
1092 {
1093 EVP_PKEY_RSA2,
1094 EVP_PKEY_RSA,
1095 ASN1_PKEY_ALIAS}
1096};
1097
1098const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
1099 EVP_PKEY_RSA_PSS,
1100 EVP_PKEY_RSA_PSS,
1101 ASN1_PKEY_SIGPARAM_NULL,
1102
1103 "RSA-PSS",
1104 "OpenSSL RSA-PSS method",
1105
1106 rsa_pub_decode,
1107 rsa_pub_encode,
1108 rsa_pub_cmp,
1109 rsa_pub_print,
1110
1111 rsa_priv_decode,
1112 rsa_priv_encode,
1113 rsa_priv_print,
1114
1115 int_rsa_size,
1116 rsa_bits,
1117 rsa_security_bits,
1118
1119 0, 0, 0, 0, 0, 0,
1120
1121 rsa_sig_print,
1122 int_rsa_free,
1123 rsa_pkey_ctrl,
1124 0, 0,
1125 rsa_item_verify,
1126 rsa_item_sign,
1127 0,
1128 rsa_pkey_check
1129};