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make EVP_PKEY opaque
[thirdparty/openssl.git] / crypto / rsa / rsa_ameth.c
CommitLineData
09b88a4a 1/* crypto/rsa/rsa_ameth.c */
0f113f3e
MC		 2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 2006.
448be743
DSH		 5 */
6/* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
0f113f3e 14 * notice, this list of conditions and the following disclaimer.
448be743
DSH		 15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
b39fc560 61#include "internal/cryptlib.h"
448be743
DSH		 62#include <openssl/asn1t.h>
63#include <openssl/x509.h>
64#include <openssl/rsa.h>
1e26a8ba 65#include <openssl/bn.h>
8931b30d 66#ifndef OPENSSL_NO_CMS
0f113f3e 67# include <openssl/cms.h>
8931b30d 68#endif
5fe736e5 69#include "internal/asn1_int.h"
3aeb9348 70#include "internal/evp_int.h"
448be743 71
e968561d 72#ifndef OPENSSL_NO_CMS
0574cadf
DSH		 73static int rsa_cms_sign(CMS_SignerInfo *si);
74static int rsa_cms_verify(CMS_SignerInfo *si);
75static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
76static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
e968561d 77#endif
0574cadf 78
6f81892e 79static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
0f113f3e
MC		 80{
81 unsigned char *penc = NULL;
82 int penclen;
83 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
84 if (penclen <= 0)
85 return 0;
86 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA),
87 V_ASN1_NULL, NULL, penc, penclen))
88 return 1;
89
90 OPENSSL_free(penc);
91 return 0;
92}
448be743
DSH		 93
94static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
0f113f3e
MC		 95{
96 const unsigned char *p;
97 int pklen;
98 RSA *rsa = NULL;
75ebbd9a 99
0f113f3e
MC		 100 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey))
101 return 0;
75ebbd9a 102 if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
0f113f3e
MC		 103 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
104 return 0;
105 }
106 EVP_PKEY_assign_RSA(pkey, rsa);
107 return 1;
108}
448be743 109
6f81892e 110static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
0f113f3e
MC		 111{
112 if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
113 || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
114 return 0;
115 return 1;
116}
6f81892e 117
e4263314 118static int old_rsa_priv_decode(EVP_PKEY *pkey,
0f113f3e
MC		 119 const unsigned char **pder, int derlen)
120{
121 RSA *rsa;
75ebbd9a
RS		 122
123 if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
0f113f3e
MC		 124 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
125 return 0;
126 }
127 EVP_PKEY_assign_RSA(pkey, rsa);
128 return 1;
129}
448be743 130
e4263314 131static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
0f113f3e
MC		 132{
133 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
134}
e4263314 135
6f81892e 136static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
0f113f3e
MC		 137{
138 unsigned char *rk = NULL;
139 int rklen;
140 rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
141
142 if (rklen <= 0) {
143 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
144 return 0;
145 }
146
147 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_rsaEncryption), 0,
148 V_ASN1_NULL, NULL, rk, rklen)) {
149 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
150 return 0;
151 }
152
153 return 1;
154}
448be743 155
e4263314 156static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
0f113f3e
MC		 157{
158 const unsigned char *p;
159 int pklen;
160 if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8))
161 return 0;
162 return old_rsa_priv_decode(pkey, &p, pklen);
163}
e4263314 164
6f81892e 165static int int_rsa_size(const EVP_PKEY *pkey)
0f113f3e
MC		 166{
167 return RSA_size(pkey->pkey.rsa);
168}
6f81892e
DSH		 169
170static int rsa_bits(const EVP_PKEY *pkey)
0f113f3e
MC		 171{
172 return BN_num_bits(pkey->pkey.rsa->n);
173}
6f81892e 174
2514fa79 175static int rsa_security_bits(const EVP_PKEY *pkey)
0f113f3e
MC		 176{
177 return RSA_security_bits(pkey->pkey.rsa);
178}
2514fa79 179
6f81892e 180static void int_rsa_free(EVP_PKEY *pkey)
0f113f3e
MC		 181{
182 RSA_free(pkey->pkey.rsa);
183}
35208f36
DSH		 184
185static void update_buflen(const BIGNUM *b, size_t *pbuflen)
0f113f3e
MC		 186{
187 size_t i;
188 if (!b)
189 return;
190 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
191 *pbuflen = i;
192}
35208f36
DSH		 193
194static int do_rsa_print(BIO *bp, const RSA *x, int off, int priv)
0f113f3e
MC		 195{
196 char *str;
197 const char *s;
198 unsigned char *m = NULL;
199 int ret = 0, mod_len = 0;
200 size_t buf_len = 0;
201
202 update_buflen(x->n, &buf_len);
203 update_buflen(x->e, &buf_len);
204
205 if (priv) {
206 update_buflen(x->d, &buf_len);
207 update_buflen(x->p, &buf_len);
208 update_buflen(x->q, &buf_len);
209 update_buflen(x->dmp1, &buf_len);
210 update_buflen(x->dmq1, &buf_len);
211 update_buflen(x->iqmp, &buf_len);
212 }
213
b196e7d9 214 m = OPENSSL_malloc(buf_len + 10);
0f113f3e
MC		 215 if (m == NULL) {
216 RSAerr(RSA_F_DO_RSA_PRINT, ERR_R_MALLOC_FAILURE);
217 goto err;
218 }
219
220 if (x->n != NULL)
221 mod_len = BN_num_bits(x->n);
222
223 if (!BIO_indent(bp, off, 128))
224 goto err;
225
226 if (priv && x->d) {
227 if (BIO_printf(bp, "Private-Key: (%d bit)\n", mod_len)
228 <= 0)
229 goto err;
230 str = "modulus:";
231 s = "publicExponent:";
232 } else {
233 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len)
234 <= 0)
235 goto err;
236 str = "Modulus:";
237 s = "Exponent:";
238 }
239 if (!ASN1_bn_print(bp, str, x->n, m, off))
240 goto err;
241 if (!ASN1_bn_print(bp, s, x->e, m, off))
242 goto err;
243 if (priv) {
244 if (!ASN1_bn_print(bp, "privateExponent:", x->d, m, off))
245 goto err;
246 if (!ASN1_bn_print(bp, "prime1:", x->p, m, off))
247 goto err;
248 if (!ASN1_bn_print(bp, "prime2:", x->q, m, off))
249 goto err;
250 if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, m, off))
251 goto err;
252 if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, m, off))
253 goto err;
254 if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, m, off))
255 goto err;
256 }
257 ret = 1;
258 err:
b548a1f1 259 OPENSSL_free(m);
0f113f3e
MC		 260 return (ret);
261}
35208f36
DSH		 262
263static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
0f113f3e
MC		 264 ASN1_PCTX *ctx)
265{
266 return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
267}
35208f36
DSH		 268
269static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
0f113f3e
MC		 270 ASN1_PCTX *ctx)
271{
272 return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
273}
35208f36 274
0574cadf
DSH		 275/* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
276static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
0f113f3e 277{
0f113f3e
MC		 278 if (alg == NULL)
279 return NULL;
280 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
281 return NULL;
e93c8748
DSH		 282 return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
283 alg->parameter);
0f113f3e 284}
0574cadf 285
63b825c9 286static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
0f113f3e
MC		 287 X509_ALGOR **pmaskHash)
288{
0f113f3e
MC		 289 RSA_PSS_PARAMS *pss;
290
291 *pmaskHash = NULL;
292
e93c8748
DSH		 293 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
294 alg->parameter);
0f113f3e
MC		 295
296 if (!pss)
297 return NULL;
298
299 *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
300
301 return pss;
302}
303
304static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
305 X509_ALGOR *maskHash, int indent)
306{
307 int rv = 0;
308 if (!pss) {
309 if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0)
310 return 0;
311 return 1;
312 }
313 if (BIO_puts(bp, "\n") <= 0)
314 goto err;
315 if (!BIO_indent(bp, indent, 128))
316 goto err;
317 if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
318 goto err;
319
320 if (pss->hashAlgorithm) {
321 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
322 goto err;
323 } else if (BIO_puts(bp, "sha1 (default)") <= 0)
324 goto err;
325
326 if (BIO_puts(bp, "\n") <= 0)
327 goto err;
328
329 if (!BIO_indent(bp, indent, 128))
330 goto err;
331
332 if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
333 goto err;
334 if (pss->maskGenAlgorithm) {
335 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
336 goto err;
337 if (BIO_puts(bp, " with ") <= 0)
338 goto err;
339 if (maskHash) {
340 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
341 goto err;
342 } else if (BIO_puts(bp, "INVALID") <= 0)
343 goto err;
344 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
345 goto err;
346 BIO_puts(bp, "\n");
347
348 if (!BIO_indent(bp, indent, 128))
349 goto err;
350 if (BIO_puts(bp, "Salt Length: 0x") <= 0)
351 goto err;
352 if (pss->saltLength) {
353 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
354 goto err;
355 } else if (BIO_puts(bp, "14 (default)") <= 0)
356 goto err;
357 BIO_puts(bp, "\n");
358
359 if (!BIO_indent(bp, indent, 128))
360 goto err;
361 if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
362 goto err;
363 if (pss->trailerField) {
364 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
365 goto err;
366 } else if (BIO_puts(bp, "BC (default)") <= 0)
367 goto err;
368 BIO_puts(bp, "\n");
369
370 rv = 1;
371
372 err:
373 return rv;
374
375}
ff04bbe3
DSH		 376
377static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
0f113f3e
MC		 378 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
379{
380 if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) {
381 int rv;
382 RSA_PSS_PARAMS *pss;
383 X509_ALGOR *maskHash;
384 pss = rsa_pss_decode(sigalg, &maskHash);
385 rv = rsa_pss_param_print(bp, pss, maskHash, indent);
25aaa98a 386 RSA_PSS_PARAMS_free(pss);
222561fe 387 X509_ALGOR_free(maskHash);
0f113f3e
MC		 388 if (!rv)
389 return 0;
390 } else if (!sig && BIO_puts(bp, "\n") <= 0)
391 return 0;
392 if (sig)
393 return X509_signature_dump(bp, sig, indent);
394 return 1;
395}
492a9e24
DSH		 396
397static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
0f113f3e
MC		 398{
399 X509_ALGOR *alg = NULL;
400 switch (op) {
401
402 case ASN1_PKEY_CTRL_PKCS7_SIGN:
403 if (arg1 == 0)
404 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
405 break;
406
407 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
408 if (arg1 == 0)
409 PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
410 break;
8931b30d 411#ifndef OPENSSL_NO_CMS
0f113f3e
MC		 412 case ASN1_PKEY_CTRL_CMS_SIGN:
413 if (arg1 == 0)
414 return rsa_cms_sign(arg2);
415 else if (arg1 == 1)
416 return rsa_cms_verify(arg2);
417 break;
418
419 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
420 if (arg1 == 0)
421 return rsa_cms_encrypt(arg2);
422 else if (arg1 == 1)
423 return rsa_cms_decrypt(arg2);
424 break;
425
426 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
427 *(int *)arg2 = CMS_RECIPINFO_TRANS;
428 return 1;
8931b30d 429#endif
a78568b7 430
0f113f3e
MC		 431 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
432 *(int *)arg2 = NID_sha256;
433 return 1;
03919683 434
0f113f3e
MC		 435 default:
436 return -2;
492a9e24 437
0f113f3e 438 }
492a9e24 439
0f113f3e
MC		 440 if (alg)
441 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
4f1aa191 442
0f113f3e 443 return 1;
4f1aa191 444
0f113f3e 445}
492a9e24 446
0574cadf
DSH		 447/* allocate and set algorithm ID from EVP_MD, default SHA1 */
448static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
0f113f3e
MC		 449{
450 if (EVP_MD_type(md) == NID_sha1)
451 return 1;
452 *palg = X509_ALGOR_new();
90945fa3 453 if (*palg == NULL)
0f113f3e
MC		 454 return 0;
455 X509_ALGOR_set_md(*palg, md);
456 return 1;
457}
0574cadf
DSH		 458
459/* Allocate and set MGF1 algorithm ID from EVP_MD */
460static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
0f113f3e
MC		 461{
462 X509_ALGOR *algtmp = NULL;
463 ASN1_STRING *stmp = NULL;
464 *palg = NULL;
465 if (EVP_MD_type(mgf1md) == NID_sha1)
466 return 1;
467 /* need to embed algorithm ID inside another */
468 if (!rsa_md_to_algor(&algtmp, mgf1md))
469 goto err;
470 if (!ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp))
471 goto err;
472 *palg = X509_ALGOR_new();
90945fa3 473 if (*palg == NULL)
0f113f3e
MC		 474 goto err;
475 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
476 stmp = NULL;
477 err:
0dfb9398 478 ASN1_STRING_free(stmp);
222561fe 479 X509_ALGOR_free(algtmp);
0f113f3e
MC		 480 if (*palg)
481 return 1;
482 return 0;
483}
0574cadf
DSH		 484
485/* convert algorithm ID to EVP_MD, default SHA1 */
486static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
0f113f3e
MC		 487{
488 const EVP_MD *md;
489 if (!alg)
490 return EVP_sha1();
491 md = EVP_get_digestbyobj(alg->algorithm);
492 if (md == NULL)
493 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
494 return md;
495}
496
0574cadf
DSH		 497/* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
498static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash)
0f113f3e
MC		 499{
500 const EVP_MD *md;
501 if (!alg)
502 return EVP_sha1();
503 /* Check mask and lookup mask hash algorithm */
504 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) {
505 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
506 return NULL;
507 }
508 if (!maskHash) {
509 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_PARAMETER);
510 return NULL;
511 }
512 md = EVP_get_digestbyobj(maskHash->algorithm);
513 if (md == NULL) {
514 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNKNOWN_MASK_DIGEST);
515 return NULL;
516 }
517 return md;
518}
519
520/*
521 * Convert EVP_PKEY_CTX is PSS mode into corresponding algorithm parameter,
0574cadf 522 * suitable for setting an AlgorithmIdentifier.
31904ecd
DSH		 523 */
524
0574cadf 525static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
0f113f3e
MC		 526{
527 const EVP_MD *sigmd, *mgf1md;
528 RSA_PSS_PARAMS *pss = NULL;
529 ASN1_STRING *os = NULL;
530 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
531 int saltlen, rv = 0;
532 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
533 goto err;
534 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
535 goto err;
536 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
537 goto err;
538 if (saltlen == -1)
539 saltlen = EVP_MD_size(sigmd);
540 else if (saltlen == -2) {
541 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
542 if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
543 saltlen--;
544 }
545 pss = RSA_PSS_PARAMS_new();
90945fa3 546 if (pss == NULL)
0f113f3e
MC		 547 goto err;
548 if (saltlen != 20) {
549 pss->saltLength = ASN1_INTEGER_new();
90945fa3 550 if (pss->saltLength == NULL)
0f113f3e
MC		 551 goto err;
552 if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
553 goto err;
554 }
555 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
556 goto err;
557 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
558 goto err;
559 /* Finally create string with pss parameter encoding. */
560 if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os))
561 goto err;
562 rv = 1;
563 err:
25aaa98a 564 RSA_PSS_PARAMS_free(pss);
0f113f3e
MC		 565 if (rv)
566 return os;
0dfb9398 567 ASN1_STRING_free(os);
0f113f3e
MC		 568 return NULL;
569}
570
571/*
572 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
573 * then the EVP_MD_CTX is setup and initalised. If it is NULL parameters are
574 * passed to pkctx instead.
0574cadf 575 */
31904ecd 576
0574cadf 577static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
0f113f3e
MC		 578 X509_ALGOR *sigalg, EVP_PKEY *pkey)
579{
580 int rv = -1;
581 int saltlen;
582 const EVP_MD *mgf1md = NULL, *md = NULL;
583 RSA_PSS_PARAMS *pss;
584 X509_ALGOR *maskHash;
585 /* Sanity check: make sure it is PSS */
586 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
587 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
588 return -1;
589 }
590 /* Decode PSS parameters */
591 pss = rsa_pss_decode(sigalg, &maskHash);
592
593 if (pss == NULL) {
594 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
595 goto err;
596 }
597 mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
598 if (!mgf1md)
599 goto err;
600 md = rsa_algor_to_md(pss->hashAlgorithm);
601 if (!md)
602 goto err;
603
604 if (pss->saltLength) {
605 saltlen = ASN1_INTEGER_get(pss->saltLength);
606
607 /*
608 * Could perform more salt length sanity checks but the main RSA
609 * routines will trap other invalid values anyway.
610 */
611 if (saltlen < 0) {
612 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_SALT_LENGTH);
613 goto err;
614 }
615 } else
616 saltlen = 20;
617
618 /*
619 * low-level routines support only trailer field 0xbc (value 1) and
620 * PKCS#1 says we should reject any other value anyway.
621 */
622 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
623 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_TRAILER);
624 goto err;
625 }
626
627 /* We have all parameters now set up context */
628
629 if (pkey) {
630 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
631 goto err;
632 } else {
633 const EVP_MD *checkmd;
634 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
635 goto err;
636 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
637 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
638 goto err;
639 }
640 }
641
642 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
643 goto err;
644
645 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
646 goto err;
647
648 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
649 goto err;
650 /* Carry on */
651 rv = 1;
652
653 err:
654 RSA_PSS_PARAMS_free(pss);
222561fe 655 X509_ALGOR_free(maskHash);
0f113f3e
MC		 656 return rv;
657}
492a9e24 658
e968561d 659#ifndef OPENSSL_NO_CMS
0574cadf 660static int rsa_cms_verify(CMS_SignerInfo *si)
0f113f3e
MC		 661{
662 int nid, nid2;
663 X509_ALGOR *alg;
664 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
665 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
666 nid = OBJ_obj2nid(alg->algorithm);
667 if (nid == NID_rsaEncryption)
668 return 1;
669 if (nid == NID_rsassaPss)
670 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
671 /* Workaround for some implementation that use a signature OID */
672 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
673 if (nid2 == NID_rsaEncryption)
674 return 1;
675 }
676 return 0;
677}
e968561d 678#endif
0f113f3e
MC		 679
680/*
681 * Customised RSA item verification routine. This is called when a signature
682 * is encountered requiring special handling. We currently only handle PSS.
0574cadf
DSH		 683 */
684
0574cadf 685static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
0f113f3e
MC		 686 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
687 EVP_PKEY *pkey)
688{
689 /* Sanity check: make sure it is PSS */
690 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
691 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
692 return -1;
693 }
09f06923 694 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
0f113f3e
MC		 695 /* Carry on */
696 return 2;
09f06923 697 }
0f113f3e
MC		 698 return -1;
699}
0574cadf 700
e968561d 701#ifndef OPENSSL_NO_CMS
0574cadf 702static int rsa_cms_sign(CMS_SignerInfo *si)
0f113f3e
MC		 703{
704 int pad_mode = RSA_PKCS1_PADDING;
705 X509_ALGOR *alg;
706 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
707 ASN1_STRING *os = NULL;
708 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
709 if (pkctx) {
710 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
711 return 0;
712 }
713 if (pad_mode == RSA_PKCS1_PADDING) {
714 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
715 return 1;
716 }
717 /* We don't support it */
718 if (pad_mode != RSA_PKCS1_PSS_PADDING)
719 return 0;
720 os = rsa_ctx_to_pss(pkctx);
721 if (!os)
722 return 0;
723 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
724 return 1;
725}
e968561d 726#endif
0574cadf 727
17c63d1c 728static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
0f113f3e
MC		 729 X509_ALGOR *alg1, X509_ALGOR *alg2,
730 ASN1_BIT_STRING *sig)
731{
732 int pad_mode;
6e59a892 733 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
0f113f3e
MC		 734 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
735 return 0;
736 if (pad_mode == RSA_PKCS1_PADDING)
737 return 2;
738 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
739 ASN1_STRING *os1 = NULL;
740 os1 = rsa_ctx_to_pss(pkctx);
741 if (!os1)
742 return 0;
743 /* Duplicate parameters if we have to */
744 if (alg2) {
745 ASN1_STRING *os2 = ASN1_STRING_dup(os1);
746 if (!os2) {
747 ASN1_STRING_free(os1);
748 return 0;
749 }
750 X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
751 V_ASN1_SEQUENCE, os2);
752 }
753 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
754 V_ASN1_SEQUENCE, os1);
755 return 3;
756 }
757 return 2;
758}
17c63d1c 759
e968561d 760#ifndef OPENSSL_NO_CMS
0574cadf 761static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg,
0f113f3e
MC		 762 X509_ALGOR **pmaskHash)
763{
0f113f3e 764 RSA_OAEP_PARAMS *pss;
0574cadf 765
0f113f3e 766 *pmaskHash = NULL;
0574cadf 767
e93c8748
DSH		 768 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
769 alg->parameter);
0574cadf 770
0f113f3e
MC		 771 if (!pss)
772 return NULL;
0574cadf 773
0f113f3e 774 *pmaskHash = rsa_mgf1_decode(pss->maskGenFunc);
0574cadf 775
0f113f3e
MC		 776 return pss;
777}
0574cadf
DSH		 778
779static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
0f113f3e
MC		 780{
781 EVP_PKEY_CTX *pkctx;
782 X509_ALGOR *cmsalg;
783 int nid;
784 int rv = -1;
785 unsigned char *label = NULL;
786 int labellen = 0;
787 const EVP_MD *mgf1md = NULL, *md = NULL;
788 RSA_OAEP_PARAMS *oaep;
789 X509_ALGOR *maskHash;
790 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
791 if (!pkctx)
792 return 0;
793 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
794 return -1;
795 nid = OBJ_obj2nid(cmsalg->algorithm);
796 if (nid == NID_rsaEncryption)
797 return 1;
798 if (nid != NID_rsaesOaep) {
799 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
800 return -1;
801 }
802 /* Decode OAEP parameters */
803 oaep = rsa_oaep_decode(cmsalg, &maskHash);
804
805 if (oaep == NULL) {
806 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
807 goto err;
808 }
809
810 mgf1md = rsa_mgf1_to_md(oaep->maskGenFunc, maskHash);
811 if (!mgf1md)
812 goto err;
813 md = rsa_algor_to_md(oaep->hashFunc);
814 if (!md)
815 goto err;
816
817 if (oaep->pSourceFunc) {
818 X509_ALGOR *plab = oaep->pSourceFunc;
819 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
820 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
821 goto err;
822 }
823 if (plab->parameter->type != V_ASN1_OCTET_STRING) {
824 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
825 goto err;
826 }
827
828 label = plab->parameter->value.octet_string->data;
829 /* Stop label being freed when OAEP parameters are freed */
830 plab->parameter->value.octet_string->data = NULL;
831 labellen = plab->parameter->value.octet_string->length;
832 }
833
834 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
835 goto err;
836 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
837 goto err;
838 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
839 goto err;
840 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
841 goto err;
842 /* Carry on */
843 rv = 1;
844
845 err:
846 RSA_OAEP_PARAMS_free(oaep);
222561fe 847 X509_ALGOR_free(maskHash);
0f113f3e
MC		 848 return rv;
849}
0574cadf
DSH		 850
851static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
0f113f3e
MC		 852{
853 const EVP_MD *md, *mgf1md;
854 RSA_OAEP_PARAMS *oaep = NULL;
855 ASN1_STRING *os = NULL;
856 X509_ALGOR *alg;
857 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
858 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
859 unsigned char *label;
860 CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
861 if (pkctx) {
862 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
863 return 0;
864 }
865 if (pad_mode == RSA_PKCS1_PADDING) {
866 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
867 return 1;
868 }
869 /* Not supported */
870 if (pad_mode != RSA_PKCS1_OAEP_PADDING)
871 return 0;
872 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
873 goto err;
874 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
875 goto err;
876 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
877 if (labellen < 0)
878 goto err;
879 oaep = RSA_OAEP_PARAMS_new();
90945fa3 880 if (oaep == NULL)
0f113f3e
MC		 881 goto err;
882 if (!rsa_md_to_algor(&oaep->hashFunc, md))
883 goto err;
884 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
885 goto err;
886 if (labellen > 0) {
887 ASN1_OCTET_STRING *los = ASN1_OCTET_STRING_new();
888 oaep->pSourceFunc = X509_ALGOR_new();
90945fa3 889 if (oaep->pSourceFunc == NULL)
0f113f3e 890 goto err;
90945fa3 891 if (los == NULL)
0f113f3e
MC		 892 goto err;
893 if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
894 ASN1_OCTET_STRING_free(los);
895 goto err;
896 }
897 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
898 V_ASN1_OCTET_STRING, los);
899 }
900 /* create string with pss parameter encoding. */
901 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
902 goto err;
903 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
904 os = NULL;
905 rv = 1;
906 err:
25aaa98a 907 RSA_OAEP_PARAMS_free(oaep);
0dfb9398 908 ASN1_STRING_free(os);
0f113f3e
MC		 909 return rv;
910}
e968561d 911#endif
0f113f3e
MC		 912
913const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[] = {
914 {
915 EVP_PKEY_RSA,
916 EVP_PKEY_RSA,
917 ASN1_PKEY_SIGPARAM_NULL,
918
919 "RSA",
920 "OpenSSL RSA method",
921
922 rsa_pub_decode,
923 rsa_pub_encode,
924 rsa_pub_cmp,
925 rsa_pub_print,
926
927 rsa_priv_decode,
928 rsa_priv_encode,
929 rsa_priv_print,
930
931 int_rsa_size,
932 rsa_bits,
933 rsa_security_bits,
934
935 0, 0, 0, 0, 0, 0,
936
937 rsa_sig_print,
938 int_rsa_free,
939 rsa_pkey_ctrl,
940 old_rsa_priv_decode,
941 old_rsa_priv_encode,
942 rsa_item_verify,
943 rsa_item_sign},
944
945 {
946 EVP_PKEY_RSA2,
947 EVP_PKEY_RSA,
948 ASN1_PKEY_ALIAS}
949};
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