1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2006.
3 */
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com). */
55
56 #include <openssl/evp.h>
57
58 #include <openssl/asn1.h>
59 #include <openssl/asn1t.h>
60 #include <openssl/bytestring.h>
61 #include <openssl/digest.h>
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
64 #include <openssl/obj.h>
65 #include <openssl/rsa.h>
66 #include <openssl/x509.h>
67
68 #include "../rsa/internal.h"
69 #include "internal.h"
70
71
rsa_pub_encode(X509_PUBKEY * pk,const EVP_PKEY * pkey)72 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) {
73 uint8_t *encoded;
74 size_t encoded_len;
75 if (!RSA_public_key_to_bytes(&encoded, &encoded_len, pkey->pkey.rsa)) {
76 return 0;
77 }
78
79 if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA), V_ASN1_NULL, NULL,
80 encoded, encoded_len)) {
81 OPENSSL_free(encoded);
82 return 0;
83 }
84
85 return 1;
86 }
87
rsa_pub_decode(EVP_PKEY * pkey,X509_PUBKEY * pubkey)88 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) {
89 const uint8_t *p;
90 int pklen;
91 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey)) {
92 return 0;
93 }
94
95 /* Estonian IDs issued between September 2014 to September 2015 are
96 * broken. See https://crbug.com/532048 and https://crbug.com/534766.
97 *
98 * TODO(davidben): Switch this to the strict version in March 2016 or when
99 * Chromium can force client certificates down a different codepath, whichever
100 * comes first. */
101 CBS cbs;
102 CBS_init(&cbs, p, pklen);
103 RSA *rsa = RSA_parse_public_key_buggy(&cbs);
104 if (rsa == NULL || CBS_len(&cbs) != 0) {
105 OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
106 RSA_free(rsa);
107 return 0;
108 }
109
110 EVP_PKEY_assign_RSA(pkey, rsa);
111 return 1;
112 }
113
rsa_pub_cmp(const EVP_PKEY * a,const EVP_PKEY * b)114 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
115 return BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) == 0 &&
116 BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) == 0;
117 }
118
rsa_priv_encode(PKCS8_PRIV_KEY_INFO * p8,const EVP_PKEY * pkey)119 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) {
120 uint8_t *encoded;
121 size_t encoded_len;
122 if (!RSA_private_key_to_bytes(&encoded, &encoded_len, pkey->pkey.rsa)) {
123 return 0;
124 }
125
126 /* TODO(fork): const correctness in next line. */
127 if (!PKCS8_pkey_set0(p8, (ASN1_OBJECT *)OBJ_nid2obj(NID_rsaEncryption), 0,
128 V_ASN1_NULL, NULL, encoded, encoded_len)) {
129 OPENSSL_free(encoded);
130 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
131 return 0;
132 }
133
134 return 1;
135 }
136
rsa_priv_decode(EVP_PKEY * pkey,PKCS8_PRIV_KEY_INFO * p8)137 static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) {
138 const uint8_t *p;
139 int pklen;
140 if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8)) {
141 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
142 return 0;
143 }
144
145 RSA *rsa = RSA_private_key_from_bytes(p, pklen);
146 if (rsa == NULL) {
147 OPENSSL_PUT_ERROR(EVP, ERR_R_RSA_LIB);
148 return 0;
149 }
150
151 EVP_PKEY_assign_RSA(pkey, rsa);
152 return 1;
153 }
154
rsa_opaque(const EVP_PKEY * pkey)155 static int rsa_opaque(const EVP_PKEY *pkey) {
156 return RSA_is_opaque(pkey->pkey.rsa);
157 }
158
rsa_supports_digest(const EVP_PKEY * pkey,const EVP_MD * md)159 static int rsa_supports_digest(const EVP_PKEY *pkey, const EVP_MD *md) {
160 return RSA_supports_digest(pkey->pkey.rsa, md);
161 }
162
int_rsa_size(const EVP_PKEY * pkey)163 static int int_rsa_size(const EVP_PKEY *pkey) {
164 return RSA_size(pkey->pkey.rsa);
165 }
166
rsa_bits(const EVP_PKEY * pkey)167 static int rsa_bits(const EVP_PKEY *pkey) {
168 return BN_num_bits(pkey->pkey.rsa->n);
169 }
170
int_rsa_free(EVP_PKEY * pkey)171 static void int_rsa_free(EVP_PKEY *pkey) { RSA_free(pkey->pkey.rsa); }
172
update_buflen(const BIGNUM * b,size_t * pbuflen)173 static void update_buflen(const BIGNUM *b, size_t *pbuflen) {
174 size_t i;
175
176 if (!b) {
177 return;
178 }
179
180 i = BN_num_bytes(b);
181 if (*pbuflen < i) {
182 *pbuflen = i;
183 }
184 }
185
do_rsa_print(BIO * out,const RSA * rsa,int off,int include_private)186 static int do_rsa_print(BIO *out, const RSA *rsa, int off,
187 int include_private) {
188 char *str;
189 const char *s;
190 uint8_t *m = NULL;
191 int ret = 0, mod_len = 0;
192 size_t buf_len = 0;
193
194 update_buflen(rsa->n, &buf_len);
195 update_buflen(rsa->e, &buf_len);
196
197 if (include_private) {
198 update_buflen(rsa->d, &buf_len);
199 update_buflen(rsa->p, &buf_len);
200 update_buflen(rsa->q, &buf_len);
201 update_buflen(rsa->dmp1, &buf_len);
202 update_buflen(rsa->dmq1, &buf_len);
203 update_buflen(rsa->iqmp, &buf_len);
204
205 if (rsa->additional_primes != NULL) {
206 size_t i;
207
208 for (i = 0; i < sk_RSA_additional_prime_num(rsa->additional_primes);
209 i++) {
210 const RSA_additional_prime *ap =
211 sk_RSA_additional_prime_value(rsa->additional_primes, i);
212 update_buflen(ap->prime, &buf_len);
213 update_buflen(ap->exp, &buf_len);
214 update_buflen(ap->coeff, &buf_len);
215 }
216 }
217 }
218
219 m = (uint8_t *)OPENSSL_malloc(buf_len + 10);
220 if (m == NULL) {
221 OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
222 goto err;
223 }
224
225 if (rsa->n != NULL) {
226 mod_len = BN_num_bits(rsa->n);
227 }
228
229 if (!BIO_indent(out, off, 128)) {
230 goto err;
231 }
232
233 if (include_private && rsa->d) {
234 if (BIO_printf(out, "Private-Key: (%d bit)\n", mod_len) <= 0) {
235 goto err;
236 }
237 str = "modulus:";
238 s = "publicExponent:";
239 } else {
240 if (BIO_printf(out, "Public-Key: (%d bit)\n", mod_len) <= 0) {
241 goto err;
242 }
243 str = "Modulus:";
244 s = "Exponent:";
245 }
246 if (!ASN1_bn_print(out, str, rsa->n, m, off) ||
247 !ASN1_bn_print(out, s, rsa->e, m, off)) {
248 goto err;
249 }
250
251 if (include_private) {
252 if (!ASN1_bn_print(out, "privateExponent:", rsa->d, m, off) ||
253 !ASN1_bn_print(out, "prime1:", rsa->p, m, off) ||
254 !ASN1_bn_print(out, "prime2:", rsa->q, m, off) ||
255 !ASN1_bn_print(out, "exponent1:", rsa->dmp1, m, off) ||
256 !ASN1_bn_print(out, "exponent2:", rsa->dmq1, m, off) ||
257 !ASN1_bn_print(out, "coefficient:", rsa->iqmp, m, off)) {
258 goto err;
259 }
260
261 if (rsa->additional_primes != NULL &&
262 sk_RSA_additional_prime_num(rsa->additional_primes) > 0) {
263 size_t i;
264
265 if (BIO_printf(out, "otherPrimeInfos:\n") <= 0) {
266 goto err;
267 }
268 for (i = 0; i < sk_RSA_additional_prime_num(rsa->additional_primes);
269 i++) {
270 const RSA_additional_prime *ap =
271 sk_RSA_additional_prime_value(rsa->additional_primes, i);
272
273 if (BIO_printf(out, "otherPrimeInfo (prime %u):\n",
274 (unsigned)(i + 3)) <= 0 ||
275 !ASN1_bn_print(out, "prime:", ap->prime, m, off) ||
276 !ASN1_bn_print(out, "exponent:", ap->exp, m, off) ||
277 !ASN1_bn_print(out, "coeff:", ap->coeff, m, off)) {
278 goto err;
279 }
280 }
281 }
282 }
283 ret = 1;
284
285 err:
286 OPENSSL_free(m);
287 return ret;
288 }
289
rsa_pub_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)290 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
291 ASN1_PCTX *ctx) {
292 return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
293 }
294
295
rsa_priv_print(BIO * bp,const EVP_PKEY * pkey,int indent,ASN1_PCTX * ctx)296 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
297 ASN1_PCTX *ctx) {
298 return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
299 }
300
301 /* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
rsa_mgf1_decode(X509_ALGOR * alg)302 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg) {
303 const uint8_t *p;
304 int plen;
305
306 if (alg == NULL || alg->parameter == NULL ||
307 OBJ_obj2nid(alg->algorithm) != NID_mgf1 ||
308 alg->parameter->type != V_ASN1_SEQUENCE) {
309 return NULL;
310 }
311
312 p = alg->parameter->value.sequence->data;
313 plen = alg->parameter->value.sequence->length;
314 return d2i_X509_ALGOR(NULL, &p, plen);
315 }
316
rsa_pss_decode(const X509_ALGOR * alg,X509_ALGOR ** pmaskHash)317 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
318 X509_ALGOR **pmaskHash) {
319 const uint8_t *p;
320 int plen;
321 RSA_PSS_PARAMS *pss;
322
323 *pmaskHash = NULL;
324
325 if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE) {
326 return NULL;
327 }
328 p = alg->parameter->value.sequence->data;
329 plen = alg->parameter->value.sequence->length;
330 pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen);
331
332 if (!pss) {
333 return NULL;
334 }
335
336 *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
337
338 return pss;
339 }
340
rsa_pss_param_print(BIO * bp,RSA_PSS_PARAMS * pss,X509_ALGOR * maskHash,int indent)341 static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
342 X509_ALGOR *maskHash, int indent) {
343 int rv = 0;
344
345 if (!pss) {
346 if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0) {
347 return 0;
348 }
349 return 1;
350 }
351
352 if (BIO_puts(bp, "\n") <= 0 ||
353 !BIO_indent(bp, indent, 128) ||
354 BIO_puts(bp, "Hash Algorithm: ") <= 0) {
355 goto err;
356 }
357
358 if (pss->hashAlgorithm) {
359 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) {
360 goto err;
361 }
362 } else if (BIO_puts(bp, "sha1 (default)") <= 0) {
363 goto err;
364 }
365
366 if (BIO_puts(bp, "\n") <= 0 ||
367 !BIO_indent(bp, indent, 128) ||
368 BIO_puts(bp, "Mask Algorithm: ") <= 0) {
369 goto err;
370 }
371
372 if (pss->maskGenAlgorithm) {
373 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0 ||
374 BIO_puts(bp, " with ") <= 0) {
375 goto err;
376 }
377
378 if (maskHash) {
379 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) {
380 goto err;
381 }
382 } else if (BIO_puts(bp, "INVALID") <= 0) {
383 goto err;
384 }
385 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
386 goto err;
387 }
388 BIO_puts(bp, "\n");
389
390 if (!BIO_indent(bp, indent, 128) ||
391 BIO_puts(bp, "Salt Length: 0x") <= 0) {
392 goto err;
393 }
394
395 if (pss->saltLength) {
396 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) {
397 goto err;
398 }
399 } else if (BIO_puts(bp, "14 (default)") <= 0) {
400 goto err;
401 }
402 BIO_puts(bp, "\n");
403
404 if (!BIO_indent(bp, indent, 128) ||
405 BIO_puts(bp, "Trailer Field: 0x") <= 0) {
406 goto err;
407 }
408
409 if (pss->trailerField) {
410 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) {
411 goto err;
412 }
413 } else if (BIO_puts(bp, "BC (default)") <= 0) {
414 goto err;
415 }
416 BIO_puts(bp, "\n");
417
418 rv = 1;
419
420 err:
421 return rv;
422 }
423
rsa_sig_print(BIO * bp,const X509_ALGOR * sigalg,const ASN1_STRING * sig,int indent,ASN1_PCTX * pctx)424 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
425 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) {
426 if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) {
427 int rv;
428 RSA_PSS_PARAMS *pss;
429 X509_ALGOR *maskHash;
430
431 pss = rsa_pss_decode(sigalg, &maskHash);
432 rv = rsa_pss_param_print(bp, pss, maskHash, indent);
433 RSA_PSS_PARAMS_free(pss);
434 X509_ALGOR_free(maskHash);
435 if (!rv) {
436 return 0;
437 }
438 } else if (!sig && BIO_puts(bp, "\n") <= 0) {
439 return 0;
440 }
441
442 if (sig) {
443 return X509_signature_dump(bp, sig, indent);
444 }
445 return 1;
446 }
447
old_rsa_priv_decode(EVP_PKEY * pkey,const uint8_t ** pder,int derlen)448 static int old_rsa_priv_decode(EVP_PKEY *pkey, const uint8_t **pder,
449 int derlen) {
450 RSA *rsa = d2i_RSAPrivateKey(NULL, pder, derlen);
451 if (rsa == NULL) {
452 OPENSSL_PUT_ERROR(EVP, ERR_R_RSA_LIB);
453 return 0;
454 }
455 EVP_PKEY_assign_RSA(pkey, rsa);
456 return 1;
457 }
458
old_rsa_priv_encode(const EVP_PKEY * pkey,uint8_t ** pder)459 static int old_rsa_priv_encode(const EVP_PKEY *pkey, uint8_t **pder) {
460 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
461 }
462
463 /* allocate and set algorithm ID from EVP_MD, default SHA1 */
rsa_md_to_algor(X509_ALGOR ** palg,const EVP_MD * md)464 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md) {
465 if (EVP_MD_type(md) == NID_sha1) {
466 return 1;
467 }
468 *palg = X509_ALGOR_new();
469 if (!*palg) {
470 return 0;
471 }
472 X509_ALGOR_set_md(*palg, md);
473 return 1;
474 }
475
476 /* Allocate and set MGF1 algorithm ID from EVP_MD */
rsa_md_to_mgf1(X509_ALGOR ** palg,const EVP_MD * mgf1md)477 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md) {
478 X509_ALGOR *algtmp = NULL;
479 ASN1_STRING *stmp = NULL;
480 *palg = NULL;
481
482 if (EVP_MD_type(mgf1md) == NID_sha1) {
483 return 1;
484 }
485 /* need to embed algorithm ID inside another */
486 if (!rsa_md_to_algor(&algtmp, mgf1md) ||
487 !ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp)) {
488 goto err;
489 }
490 *palg = X509_ALGOR_new();
491 if (!*palg) {
492 goto err;
493 }
494 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
495 stmp = NULL;
496
497 err:
498 ASN1_STRING_free(stmp);
499 X509_ALGOR_free(algtmp);
500 if (*palg) {
501 return 1;
502 }
503
504 return 0;
505 }
506
507 /* convert algorithm ID to EVP_MD, default SHA1 */
rsa_algor_to_md(X509_ALGOR * alg)508 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg) {
509 const EVP_MD *md;
510 if (!alg) {
511 return EVP_sha1();
512 }
513 md = EVP_get_digestbyobj(alg->algorithm);
514 if (md == NULL) {
515 OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_DIGEST);
516 }
517 return md;
518 }
519
520 /* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
rsa_mgf1_to_md(X509_ALGOR * alg,X509_ALGOR * maskHash)521 static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash) {
522 const EVP_MD *md;
523 if (!alg) {
524 return EVP_sha1();
525 }
526 /* Check mask and lookup mask hash algorithm */
527 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) {
528 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_MASK_ALGORITHM);
529 return NULL;
530 }
531 if (!maskHash) {
532 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_MASK_PARAMETER);
533 return NULL;
534 }
535 md = EVP_get_digestbyobj(maskHash->algorithm);
536 if (md == NULL) {
537 OPENSSL_PUT_ERROR(EVP, EVP_R_UNKNOWN_MASK_DIGEST);
538 return NULL;
539 }
540 return md;
541 }
542
543 /* rsa_ctx_to_pss converts EVP_PKEY_CTX in PSS mode into corresponding
544 * algorithm parameter, suitable for setting as an AlgorithmIdentifier. */
rsa_ctx_to_pss(EVP_PKEY_CTX * pkctx)545 static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) {
546 const EVP_MD *sigmd, *mgf1md;
547 RSA_PSS_PARAMS *pss = NULL;
548 ASN1_STRING *os = NULL;
549 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
550 int saltlen, rv = 0;
551
552 if (!EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) ||
553 !EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) ||
554 !EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen)) {
555 goto err;
556 }
557
558 if (saltlen == -1) {
559 saltlen = EVP_MD_size(sigmd);
560 } else if (saltlen == -2) {
561 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
562 if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0) {
563 saltlen--;
564 }
565 } else {
566 goto err;
567 }
568
569 pss = RSA_PSS_PARAMS_new();
570 if (!pss) {
571 goto err;
572 }
573
574 if (saltlen != 20) {
575 pss->saltLength = ASN1_INTEGER_new();
576 if (!pss->saltLength ||
577 !ASN1_INTEGER_set(pss->saltLength, saltlen)) {
578 goto err;
579 }
580 }
581
582 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd) ||
583 !rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) {
584 goto err;
585 }
586
587 /* Finally create string with pss parameter encoding. */
588 if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os)) {
589 goto err;
590 }
591 rv = 1;
592
593 err:
594 if (pss) {
595 RSA_PSS_PARAMS_free(pss);
596 }
597 if (rv) {
598 return os;
599 }
600 if (os) {
601 ASN1_STRING_free(os);
602 }
603 return NULL;
604 }
605
606 /* From PSS AlgorithmIdentifier set public key parameters. */
rsa_pss_to_ctx(EVP_MD_CTX * ctx,X509_ALGOR * sigalg,EVP_PKEY * pkey)607 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, X509_ALGOR *sigalg, EVP_PKEY *pkey) {
608 int ret = 0;
609 int saltlen;
610 const EVP_MD *mgf1md = NULL, *md = NULL;
611 RSA_PSS_PARAMS *pss;
612 X509_ALGOR *maskHash;
613 EVP_PKEY_CTX *pkctx;
614
615 /* Sanity check: make sure it is PSS */
616 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
617 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_SIGNATURE_TYPE);
618 return 0;
619 }
620 /* Decode PSS parameters */
621 pss = rsa_pss_decode(sigalg, &maskHash);
622 if (pss == NULL) {
623 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PSS_PARAMETERS);
624 goto err;
625 }
626
627 mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
628 if (!mgf1md) {
629 goto err;
630 }
631 md = rsa_algor_to_md(pss->hashAlgorithm);
632 if (!md) {
633 goto err;
634 }
635
636 saltlen = 20;
637 if (pss->saltLength) {
638 saltlen = ASN1_INTEGER_get(pss->saltLength);
639
640 /* Could perform more salt length sanity checks but the main
641 * RSA routines will trap other invalid values anyway. */
642 if (saltlen < 0) {
643 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SALT_LENGTH);
644 goto err;
645 }
646 }
647
648 /* low-level routines support only trailer field 0xbc (value 1)
649 * and PKCS#1 says we should reject any other value anyway. */
650 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
651 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_TRAILER);
652 goto err;
653 }
654
655 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey) ||
656 !EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) ||
657 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) ||
658 !EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md)) {
659 goto err;
660 }
661
662 ret = 1;
663
664 err:
665 RSA_PSS_PARAMS_free(pss);
666 if (maskHash) {
667 X509_ALGOR_free(maskHash);
668 }
669 return ret;
670 }
671
672 /* Customised RSA AlgorithmIdentifier handling. This is called when a signature
673 * is encountered requiring special handling. We currently only handle PSS. */
rsa_digest_verify_init_from_algorithm(EVP_MD_CTX * ctx,X509_ALGOR * sigalg,EVP_PKEY * pkey)674 static int rsa_digest_verify_init_from_algorithm(EVP_MD_CTX *ctx,
675 X509_ALGOR *sigalg,
676 EVP_PKEY *pkey) {
677 /* Sanity check: make sure it is PSS */
678 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
679 OPENSSL_PUT_ERROR(EVP, EVP_R_UNSUPPORTED_SIGNATURE_TYPE);
680 return 0;
681 }
682 return rsa_pss_to_ctx(ctx, sigalg, pkey);
683 }
684
rsa_digest_sign_algorithm(EVP_MD_CTX * ctx,X509_ALGOR * sigalg)685 static evp_digest_sign_algorithm_result_t rsa_digest_sign_algorithm(
686 EVP_MD_CTX *ctx, X509_ALGOR *sigalg) {
687 int pad_mode;
688 EVP_PKEY_CTX *pkctx = ctx->pctx;
689 if (!EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode)) {
690 return EVP_DIGEST_SIGN_ALGORITHM_ERROR;
691 }
692 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
693 ASN1_STRING *os1 = rsa_ctx_to_pss(pkctx);
694 if (!os1) {
695 return EVP_DIGEST_SIGN_ALGORITHM_ERROR;
696 }
697 X509_ALGOR_set0(sigalg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os1);
698 return EVP_DIGEST_SIGN_ALGORITHM_SUCCESS;
699 }
700
701 /* Other padding schemes use the default behavior. */
702 return EVP_DIGEST_SIGN_ALGORITHM_DEFAULT;
703 }
704
705 const EVP_PKEY_ASN1_METHOD rsa_asn1_meth = {
706 EVP_PKEY_RSA,
707 EVP_PKEY_RSA,
708 ASN1_PKEY_SIGPARAM_NULL,
709
710 "RSA",
711
712 rsa_pub_decode,
713 rsa_pub_encode,
714 rsa_pub_cmp,
715 rsa_pub_print,
716
717 rsa_priv_decode,
718 rsa_priv_encode,
719 rsa_priv_print,
720
721 rsa_opaque,
722 rsa_supports_digest,
723
724 int_rsa_size,
725 rsa_bits,
726
727 0,0,0,0,0,0,
728
729 rsa_sig_print,
730 int_rsa_free,
731
732 old_rsa_priv_decode,
733 old_rsa_priv_encode,
734
735 rsa_digest_verify_init_from_algorithm,
736 rsa_digest_sign_algorithm,
737 };
738