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Return correct enveloped data type in ASN1 methods.
[thirdparty/openssl.git] / crypto / rsa / rsa_ameth.c
CommitLineData
09b88a4a 1/* crypto/rsa/rsa_ameth.c */
2e597528 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
448be743
DSH		 3 * project 2006.
4 */
5/* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/asn1t.h>
62#include <openssl/x509.h>
63#include <openssl/rsa.h>
1e26a8ba 64#include <openssl/bn.h>
8931b30d
DSH		 65#ifndef OPENSSL_NO_CMS
66#include <openssl/cms.h>
67#endif
18e377b4 68#include "asn1_locl.h"
448be743 69
0574cadf
DSH		 70static int rsa_cms_sign(CMS_SignerInfo *si);
71static int rsa_cms_verify(CMS_SignerInfo *si);
72static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
73static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
74
6f81892e 75static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
448be743
DSH		 76 {
77 unsigned char *penc = NULL;
78 int penclen;
79 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
80 if (penclen <= 0)
81 return 0;
82 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA),
83 V_ASN1_NULL, NULL, penc, penclen))
84 return 1;
85
86 OPENSSL_free(penc);
87 return 0;
88 }
89
90static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
91 {
92 const unsigned char *p;
93 int pklen;
94 RSA *rsa = NULL;
95 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey))
96 return 0;
97 if (!(rsa = d2i_RSAPublicKey(NULL, &p, pklen)))
98 {
99 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
100 return 0;
101 }
102 EVP_PKEY_assign_RSA (pkey, rsa);
103 return 1;
104 }
105
6f81892e
DSH		 106static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
107 {
108 if (BN_cmp(b->pkey.rsa->n,a->pkey.rsa->n) != 0
109 || BN_cmp(b->pkey.rsa->e,a->pkey.rsa->e) != 0)
110 return 0;
111 return 1;
112 }
113
e4263314 114static int old_rsa_priv_decode(EVP_PKEY *pkey,
6343829a 115 const unsigned char **pder, int derlen)
448be743 116 {
e4263314
DSH		 117 RSA *rsa;
118 if (!(rsa = d2i_RSAPrivateKey (NULL, pder, derlen)))
448be743 119 {
5c95c2ac 120 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
448be743
DSH		 121 return 0;
122 }
e4263314 123 EVP_PKEY_assign_RSA(pkey, rsa);
448be743
DSH		 124 return 1;
125 }
126
e4263314
DSH		 127static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
128 {
129 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
130 }
131
6f81892e 132static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
448be743
DSH		 133 {
134 unsigned char *rk = NULL;
135 int rklen;
136 rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
137
138 if (rklen <= 0)
139 {
140 RSAerr(RSA_F_RSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
141 return 0;
142 }
143
144 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_rsaEncryption), 0,
145 V_ASN1_NULL, NULL, rk, rklen))
146 {
147 RSAerr(RSA_F_RSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
148 return 0;
149 }
150
151 return 1;
152 }
153
e4263314
DSH		 154static int rsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
155 {
156 const unsigned char *p;
157 int pklen;
158 if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8))
159 return 0;
160 return old_rsa_priv_decode(pkey, &p, pklen);
161 }
162
6f81892e
DSH		 163static int int_rsa_size(const EVP_PKEY *pkey)
164 {
165 return RSA_size(pkey->pkey.rsa);
166 }
167
168static int rsa_bits(const EVP_PKEY *pkey)
169 {
170 return BN_num_bits(pkey->pkey.rsa->n);
171 }
172
173static void int_rsa_free(EVP_PKEY *pkey)
174 {
175 RSA_free(pkey->pkey.rsa);
176 }
177
35208f36
DSH		 178
179static void update_buflen(const BIGNUM *b, size_t *pbuflen)
180 {
c20276e4 181 size_t i;
35208f36
DSH		 182 if (!b)
183 return;
184 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
185 *pbuflen = i;
186 }
187
188static int do_rsa_print(BIO *bp, const RSA *x, int off, int priv)
189 {
190 char *str;
191 const char *s;
192 unsigned char *m=NULL;
193 int ret=0, mod_len = 0;
194 size_t buf_len=0;
195
196 update_buflen(x->n, &buf_len);
197 update_buflen(x->e, &buf_len);
198
199 if (priv)
200 {
201 update_buflen(x->d, &buf_len);
202 update_buflen(x->p, &buf_len);
203 update_buflen(x->q, &buf_len);
204 update_buflen(x->dmp1, &buf_len);
205 update_buflen(x->dmq1, &buf_len);
206 update_buflen(x->iqmp, &buf_len);
207 }
208
209 m=(unsigned char *)OPENSSL_malloc(buf_len+10);
210 if (m == NULL)
211 {
5c95c2ac 212 RSAerr(RSA_F_DO_RSA_PRINT,ERR_R_MALLOC_FAILURE);
35208f36
DSH		 213 goto err;
214 }
215
216 if (x->n != NULL)
217 mod_len = BN_num_bits(x->n);
218
219 if(!BIO_indent(bp,off,128))
220 goto err;
221
222 if (priv && x->d)
223 {
224 if (BIO_printf(bp,"Private-Key: (%d bit)\n", mod_len)
225 <= 0) goto err;
226 str = "modulus:";
227 s = "publicExponent:";
228 }
229 else
230 {
231 if (BIO_printf(bp,"Public-Key: (%d bit)\n", mod_len)
232 <= 0) goto err;
233 str = "Modulus:";
234 s= "Exponent:";
235 }
236 if (!ASN1_bn_print(bp,str,x->n,m,off)) goto err;
237 if (!ASN1_bn_print(bp,s,x->e,m,off))
238 goto err;
239 if (priv)
240 {
241 if (!ASN1_bn_print(bp,"privateExponent:",x->d,m,off))
242 goto err;
243 if (!ASN1_bn_print(bp,"prime1:",x->p,m,off))
244 goto err;
245 if (!ASN1_bn_print(bp,"prime2:",x->q,m,off))
246 goto err;
247 if (!ASN1_bn_print(bp,"exponent1:",x->dmp1,m,off))
248 goto err;
249 if (!ASN1_bn_print(bp,"exponent2:",x->dmq1,m,off))
250 goto err;
251 if (!ASN1_bn_print(bp,"coefficient:",x->iqmp,m,off))
252 goto err;
253 }
254 ret=1;
255err:
256 if (m != NULL) OPENSSL_free(m);
257 return(ret);
258 }
259
260static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
261 ASN1_PCTX *ctx)
262 {
263 return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
264 }
265
266
267static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
268 ASN1_PCTX *ctx)
269 {
270 return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
271 }
272
0574cadf
DSH		 273/* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
274static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
275 {
276 const unsigned char *p;
277 int plen;
278 if (alg == NULL)
279 return NULL;
280 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
281 return NULL;
282 if (alg->parameter->type != V_ASN1_SEQUENCE)
283 return NULL;
284
285 p = alg->parameter->value.sequence->data;
286 plen = alg->parameter->value.sequence->length;
287 return d2i_X509_ALGOR(NULL, &p, plen);
288 }
289
63b825c9
DSH		 290static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
291 X509_ALGOR **pmaskHash)
292 {
293 const unsigned char *p;
294 int plen;
295 RSA_PSS_PARAMS *pss;
296
297 *pmaskHash = NULL;
298
299 if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE)
300 return NULL;
301 p = alg->parameter->value.sequence->data;
302 plen = alg->parameter->value.sequence->length;
303 pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen);
304
305 if (!pss)
306 return NULL;
0574cadf
DSH		 307
308 *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
63b825c9
DSH		 309
310 return pss;
311 }
312
313static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
314 X509_ALGOR *maskHash, int indent)
ff04bbe3
DSH		 315 {
316 int rv = 0;
ff04bbe3
DSH		 317 if (!pss)
318 {
319 if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0)
320 return 0;
63b825c9 321 return 1;
ff04bbe3
DSH		 322 }
323 if (BIO_puts(bp, "\n") <= 0)
324 goto err;
325 if (!BIO_indent(bp, indent, 128))
326 goto err;
327 if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
328 goto err;
329
330 if (pss->hashAlgorithm)
331 {
332 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
333 goto err;
334 }
335 else if (BIO_puts(bp, "sha1 (default)") <= 0)
336 goto err;
337
338 if (BIO_puts(bp, "\n") <= 0)
339 goto err;
340
341 if (!BIO_indent(bp, indent, 128))
342 goto err;
343
344 if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
345 goto err;
346 if (pss->maskGenAlgorithm)
347 {
ff04bbe3
DSH		 348 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
349 goto err;
350 if (BIO_puts(bp, " with ") <= 0)
351 goto err;
63b825c9
DSH		 352 if (maskHash)
353 {
354 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
355 goto err;
356 }
357 else if (BIO_puts(bp, "INVALID") <= 0)
ff04bbe3
DSH		 358 goto err;
359 }
360 else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
361 goto err;
362 BIO_puts(bp, "\n");
363
364 if (!BIO_indent(bp, indent, 128))
365 goto err;
2f58cda4 366 if (BIO_puts(bp, "Salt Length: 0x") <= 0)
ff04bbe3
DSH		 367 goto err;
368 if (pss->saltLength)
369 {
370 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
371 goto err;
372 }
2f58cda4 373 else if (BIO_puts(bp, "0x14 (default)") <= 0)
ff04bbe3
DSH		 374 goto err;
375 BIO_puts(bp, "\n");
376
377 if (!BIO_indent(bp, indent, 128))
378 goto err;
2f58cda4 379 if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
ff04bbe3
DSH		 380 goto err;
381 if (pss->trailerField)
382 {
383 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
384 goto err;
385 }
2f58cda4 386 else if (BIO_puts(bp, "BC (default)") <= 0)
ff04bbe3
DSH		 387 goto err;
388 BIO_puts(bp, "\n");
389
390 rv = 1;
391
392 err:
ff04bbe3
DSH		 393 return rv;
394
395 }
396
397static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
398 const ASN1_STRING *sig,
399 int indent, ASN1_PCTX *pctx)
400 {
401 if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss)
402 {
63b825c9
DSH		 403 int rv;
404 RSA_PSS_PARAMS *pss;
405 X509_ALGOR *maskHash;
406 pss = rsa_pss_decode(sigalg, &maskHash);
407 rv = rsa_pss_param_print(bp, pss, maskHash, indent);
408 if (pss)
409 RSA_PSS_PARAMS_free(pss);
410 if (maskHash)
411 X509_ALGOR_free(maskHash);
412 if (!rv)
ff04bbe3
DSH		 413 return 0;
414 }
8ec3fa05
DSH		 415 else if (!sig && BIO_puts(bp, "\n") <= 0)
416 return 0;
809cd0a2
DSH		 417 if (sig)
418 return X509_signature_dump(bp, sig, indent);
419 return 1;
ff04bbe3 420 }
492a9e24
DSH		 421
422static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
423 {
4f1aa191 424 X509_ALGOR *alg = NULL;
492a9e24
DSH		 425 switch (op)
426 {
a78568b7 427
492a9e24
DSH		 428 case ASN1_PKEY_CTRL_PKCS7_SIGN:
429 if (arg1 == 0)
492a9e24 430 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
4f1aa191 431 break;
492a9e24 432
a78568b7
DSH		 433 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
434 if (arg1 == 0)
a78568b7 435 PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
4f1aa191 436 break;
8931b30d
DSH		 437#ifndef OPENSSL_NO_CMS
438 case ASN1_PKEY_CTRL_CMS_SIGN:
439 if (arg1 == 0)
0574cadf
DSH		 440 return rsa_cms_sign(arg2);
441 else if (arg1 == 1)
442 return rsa_cms_verify(arg2);
4f1aa191
DSH		 443 break;
444
445 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
446 if (arg1 == 0)
0574cadf
DSH		 447 return rsa_cms_encrypt(arg2);
448 else if (arg1 == 1)
449 return rsa_cms_decrypt(arg2);
4f1aa191 450 break;
41b920ef
DSH		 451
452 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
453 *(int *)arg2 = CMS_RECIPINFO_TRANS;
454 return 1;
8931b30d 455#endif
a78568b7 456
03919683
DSH		 457 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
458 *(int *)arg2 = NID_sha1;
459 return 1;
460
492a9e24
DSH		 461 default:
462 return -2;
463
464 }
465
4f1aa191
DSH		 466 if (alg)
467 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
468 V_ASN1_NULL, 0);
469
470 return 1;
471
492a9e24
DSH		 472 }
473
0574cadf
DSH		 474/* allocate and set algorithm ID from EVP_MD, default SHA1 */
475static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
476 {
477 if (EVP_MD_type(md) == NID_sha1)
478 return 1;
479 *palg = X509_ALGOR_new();
480 if (!*palg)
481 return 0;
482 X509_ALGOR_set_md(*palg, md);
483 return 1;
484 }
485
486/* Allocate and set MGF1 algorithm ID from EVP_MD */
487static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
488 {
489 X509_ALGOR *algtmp = NULL;
490 ASN1_STRING *stmp = NULL;
491 *palg = NULL;
492 if (EVP_MD_type(mgf1md) == NID_sha1)
493 return 1;
494 /* need to embed algorithm ID inside another */
495 if (!rsa_md_to_algor(&algtmp, mgf1md))
496 goto err;
497 if (!ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp))
498 goto err;
499 *palg = X509_ALGOR_new();
500 if (!*palg)
501 goto err;
502 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
503 stmp = NULL;
504 err:
505 if (stmp)
506 ASN1_STRING_free(stmp);
507 if (algtmp)
508 X509_ALGOR_free(algtmp);
509 if (*palg)
510 return 1;
511 return 0;
512 }
513
514/* convert algorithm ID to EVP_MD, default SHA1 */
515static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
516 {
517 const EVP_MD *md;
518 if (!alg)
519 return EVP_sha1();
520 md = EVP_get_digestbyobj(alg->algorithm);
521 if (md == NULL)
522 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
523 return md;
524 }
525/* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
526static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash)
527 {
528 const EVP_MD *md;
529 if (!alg)
530 return EVP_sha1();
531 /* Check mask and lookup mask hash algorithm */
532 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
533 {
534 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
535 return NULL;
536 }
537 if (!maskHash)
538 {
539 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_PARAMETER);
540 return NULL;
541 }
542 md = EVP_get_digestbyobj(maskHash->algorithm);
543 if (md == NULL)
544 {
545 RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNKNOWN_MASK_DIGEST);
546 return NULL;
547 }
548 return md;
549 }
550
551/* Convert EVP_PKEY_CTX is PSS mode into corresponding algorithm parameter,
552 * suitable for setting an AlgorithmIdentifier.
31904ecd
DSH		 553 */
554
0574cadf
DSH		 555static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
556 {
557 const EVP_MD *sigmd, *mgf1md;
558 RSA_PSS_PARAMS *pss = NULL;
559 ASN1_STRING *os = NULL;
560 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
561 int saltlen, rv = 0;
562 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
563 goto err;
564 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
565 goto err;
566 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
567 goto err;
568 if (saltlen == -1)
569 saltlen = EVP_MD_size(sigmd);
570 else if (saltlen == -2)
571 {
572 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
573 if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
574 saltlen--;
575 }
576 pss = RSA_PSS_PARAMS_new();
577 if (!pss)
578 goto err;
579 if (saltlen != 20)
580 {
581 pss->saltLength = ASN1_INTEGER_new();
582 if (!pss->saltLength)
583 goto err;
584 if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
585 goto err;
586 }
587 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
588 goto err;
589 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
590 goto err;
591 /* Finally create string with pss parameter encoding. */
592 if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os))
593 goto err;
594 rv = 1;
595 err:
596 if (pss)
597 RSA_PSS_PARAMS_free(pss);
598 if (rv)
599 return os;
600 if (os)
601 ASN1_STRING_free(os);
602 return NULL;
603 }
604
605/* From PSS AlgorithmIdentifier set public key parameters. If pkey
606 * isn't NULL then the EVP_MD_CTX is setup and initalised. If it
607 * is NULL parameters are passed to pkctx instead.
608 */
31904ecd 609
0574cadf
DSH		 610static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
611 X509_ALGOR *sigalg, EVP_PKEY *pkey)
31904ecd
DSH		 612 {
613 int rv = -1;
614 int saltlen;
615 const EVP_MD *mgf1md = NULL, *md = NULL;
616 RSA_PSS_PARAMS *pss;
617 X509_ALGOR *maskHash;
31904ecd
DSH		 618 /* Sanity check: make sure it is PSS */
619 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss)
620 {
0574cadf 621 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
31904ecd
DSH		 622 return -1;
623 }
624 /* Decode PSS parameters */
625 pss = rsa_pss_decode(sigalg, &maskHash);
626
627 if (pss == NULL)
628 {
0574cadf 629 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
31904ecd
DSH		 630 goto err;
631 }
0574cadf
DSH		 632 mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
633 if (!mgf1md)
634 goto err;
635 md = rsa_algor_to_md(pss->hashAlgorithm);
636 if (!md)
637 goto err;
31904ecd
DSH		 638
639 if (pss->saltLength)
640 {
641 saltlen = ASN1_INTEGER_get(pss->saltLength);
642
643 /* Could perform more salt length sanity checks but the main
644 * RSA routines will trap other invalid values anyway.
645 */
646 if (saltlen < 0)
647 {
0574cadf 648 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_SALT_LENGTH);
31904ecd
DSH		 649 goto err;
650 }
651 }
652 else
653 saltlen = 20;
654
a9071652
DSH		 655 /* low-level routines support only trailer field 0xbc (value 1)
656 * and PKCS#1 says we should reject any other value anyway.
657 */
658 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1)
659 {
0574cadf 660 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_TRAILER);
a9071652
DSH		 661 goto err;
662 }
663
31904ecd
DSH		 664 /* We have all parameters now set up context */
665
0574cadf
DSH		 666 if (pkey)
667 {
668 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
669 goto err;
670 }
671 else
672 {
673 const EVP_MD *checkmd;
674 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
675 goto err;
676 if (EVP_MD_type(md) != EVP_MD_type(checkmd))
677 {
678 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
679 goto err;
680 }
681 }
31904ecd 682
17c63d1c 683 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
31904ecd
DSH		 684 goto err;
685
17c63d1c 686 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
31904ecd
DSH		 687 goto err;
688
17c63d1c 689 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
31904ecd
DSH		 690 goto err;
691 /* Carry on */
0574cadf 692 rv = 1;
31904ecd
DSH		 693
694 err:
695 RSA_PSS_PARAMS_free(pss);
696 if (maskHash)
697 X509_ALGOR_free(maskHash);
698 return rv;
699 }
492a9e24 700
0574cadf
DSH		 701static int rsa_cms_verify(CMS_SignerInfo *si)
702 {
703 int nid;
704 X509_ALGOR *alg;
705 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
706 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
707 nid = OBJ_obj2nid(alg->algorithm);
708 if (nid == NID_rsaEncryption)
709 return 1;
710 if (nid == NID_rsassaPss)
711 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
712 return 0;
713 }
714
715/* Customised RSA item verification routine. This is called
716 * when a signature is encountered requiring special handling. We
717 * currently only handle PSS.
718 */
719
720
721static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
722 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
723 EVP_PKEY *pkey)
724 {
725 /* Sanity check: make sure it is PSS */
726 if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss)
727 {
728 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
729 return -1;
730 }
731 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey))
732 /* Carry on */
733 return 2;
734 return -1;
735 }
736
737static int rsa_cms_sign(CMS_SignerInfo *si)
738 {
739 int pad_mode = RSA_PKCS1_PADDING;
740 X509_ALGOR *alg;
741 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
742 ASN1_STRING *os = NULL;
743 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
744 if (pkctx)
745 {
746 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
747 return 0;
748 }
749 if (pad_mode == RSA_PKCS1_PADDING)
750 {
751 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
752 V_ASN1_NULL, 0);
753 return 1;
754 }
755 /* We don't support it */
756 if (pad_mode != RSA_PKCS1_PSS_PADDING)
757 return 0;
758 os = rsa_ctx_to_pss(pkctx);
759 if (!os)
760 return 0;
761 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
762 return 1;
763 }
764
17c63d1c
DSH		 765static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
766 X509_ALGOR *alg1, X509_ALGOR *alg2,
767 ASN1_BIT_STRING *sig)
768 {
769 int pad_mode;
770 EVP_PKEY_CTX *pkctx = ctx->pctx;
771 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
772 return 0;
773 if (pad_mode == RSA_PKCS1_PADDING)
774 return 2;
775 if (pad_mode == RSA_PKCS1_PSS_PADDING)
776 {
0574cadf
DSH		 777 ASN1_STRING *os1 = NULL;
778 os1 = rsa_ctx_to_pss(pkctx);
779 if (!os1)
780 return 0;
781 /* Duplicate parameters if we have to */
e62774c3
DSH		 782 if (alg2)
783 {
0574cadf 784 ASN1_STRING *os2 = ASN1_STRING_dup(os1);
e62774c3 785 if (!os2)
0574cadf
DSH		 786 {
787 ASN1_STRING_free(os1);
788 return 0;
789 }
e62774c3
DSH		 790 X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
791 V_ASN1_SEQUENCE, os2);
792 }
17c63d1c
DSH		 793 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
794 V_ASN1_SEQUENCE, os1);
0574cadf 795 return 3;
17c63d1c
DSH		 796 }
797 return 2;
798 }
799
0574cadf
DSH		 800static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg,
801 X509_ALGOR **pmaskHash)
802 {
803 const unsigned char *p;
804 int plen;
805 RSA_OAEP_PARAMS *pss;
806
807 *pmaskHash = NULL;
808
809 if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE)
810 return NULL;
811 p = alg->parameter->value.sequence->data;
812 plen = alg->parameter->value.sequence->length;
813 pss = d2i_RSA_OAEP_PARAMS(NULL, &p, plen);
814
815 if (!pss)
816 return NULL;
817
818 *pmaskHash = rsa_mgf1_decode(pss->maskGenFunc);
819
820 return pss;
821 }
822
823static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
824 {
825 EVP_PKEY_CTX *pkctx;
826 X509_ALGOR *cmsalg;
827 int nid;
828 int rv = -1;
829 unsigned char *label = NULL;
830 int labellen = 0;
831 const EVP_MD *mgf1md = NULL, *md = NULL;
832 RSA_OAEP_PARAMS *oaep;
833 X509_ALGOR *maskHash;
834 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
835 if (!pkctx)
836 return 0;
837 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
838 return -1;
839 nid = OBJ_obj2nid(cmsalg->algorithm);
840 if (nid == NID_rsaEncryption)
841 return 1;
842 if (nid != NID_rsaesOaep)
843 {
844 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
845 return -1;
846 }
847 /* Decode OAEP parameters */
848 oaep = rsa_oaep_decode(cmsalg, &maskHash);
849
850 if (oaep == NULL)
851 {
852 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
853 goto err;
854 }
855
856 mgf1md = rsa_mgf1_to_md(oaep->maskGenFunc, maskHash);
857 if (!mgf1md)
858 goto err;
859 md = rsa_algor_to_md(oaep->hashFunc);
860 if (!md)
861 goto err;
862
863 if (oaep->pSourceFunc)
864 {
865 X509_ALGOR *plab = oaep->pSourceFunc;
866 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified)
867 {
868 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
869 goto err;
870 }
871 if (plab->parameter->type != V_ASN1_OCTET_STRING)
872 {
873 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
874 goto err;
875 }
876
877 label = plab->parameter->value.octet_string->data;
878 /* Stop label being freed when OAEP parameters are freed */
879 plab->parameter->value.octet_string->data = NULL;
880 labellen = plab->parameter->value.octet_string->length;
881 }
882
883 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
884 goto err;
885 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
886 goto err;
887 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
888 goto err;
889 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
890 goto err;
891 /* Carry on */
892 rv = 1;
893
894 err:
895 RSA_OAEP_PARAMS_free(oaep);
896 if (maskHash)
897 X509_ALGOR_free(maskHash);
898 return rv;
899 }
900
901static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
902 {
903 const EVP_MD *md, *mgf1md;
904 RSA_OAEP_PARAMS *oaep = NULL;
905 ASN1_STRING *os = NULL;
906 X509_ALGOR *alg;
907 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
908 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
909 unsigned char *label;
910 CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
911 if (pkctx)
912 {
913 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
914 return 0;
915 }
916 if (pad_mode == RSA_PKCS1_PADDING)
917 {
918 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption),
919 V_ASN1_NULL, 0);
920 return 1;
921 }
922 /* Not supported */
923 if (pad_mode != RSA_PKCS1_OAEP_PADDING)
924 return 0;
925 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
926 goto err;
927 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
928 goto err;
929 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
930 if (labellen < 0)
931 goto err;
932 oaep = RSA_OAEP_PARAMS_new();
933 if (!oaep)
934 goto err;
935 if (!rsa_md_to_algor(&oaep->hashFunc, md))
936 goto err;
937 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
938 goto err;
939 if (labellen > 0)
940 {
941 ASN1_OCTET_STRING *los = ASN1_OCTET_STRING_new();
942 oaep->pSourceFunc = X509_ALGOR_new();
943 if (!oaep->pSourceFunc)
944 goto err;
945 if (!los)
946 goto err;
947 if (!ASN1_OCTET_STRING_set(los, label, labellen))
948 {
949 ASN1_OCTET_STRING_free(los);
950 goto err;
951 }
952 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
953 V_ASN1_OCTET_STRING, los);
954 }
955 /* create string with pss parameter encoding. */
956 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
957 goto err;
958 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
959 os = NULL;
960 rv = 1;
961 err:
962 if (oaep)
963 RSA_OAEP_PARAMS_free(oaep);
964 if (os)
965 ASN1_STRING_free(os);
966 return rv;
967 }
968
448be743
DSH		 969const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[] =
970 {
971 {
972 EVP_PKEY_RSA,
973 EVP_PKEY_RSA,
ee1d9ec0 974 ASN1_PKEY_SIGPARAM_NULL,
6f81892e 975
e4263314 976 "RSA",
d82e2718
DSH		 977 "OpenSSL RSA method",
978
448be743
DSH		 979 rsa_pub_decode,
980 rsa_pub_encode,
6f81892e 981 rsa_pub_cmp,
35208f36 982 rsa_pub_print,
6f81892e 983
448be743
DSH		 984 rsa_priv_decode,
985 rsa_priv_encode,
35208f36 986 rsa_priv_print,
6f81892e
DSH		 987
988 int_rsa_size,
989 rsa_bits,
990
ff04bbe3 991 0,0,0,0,0,0,
6f81892e 992
ff04bbe3 993 rsa_sig_print,
6f81892e 994 int_rsa_free,
492a9e24 995 rsa_pkey_ctrl,
e4263314 996 old_rsa_priv_decode,
31904ecd 997 old_rsa_priv_encode,
17c63d1c
DSH		 998 rsa_item_verify,
999 rsa_item_sign
448be743
DSH		 1000 },
1001
1002 {
1003 EVP_PKEY_RSA2,
1004 EVP_PKEY_RSA,
1005 ASN1_PKEY_ALIAS
1006 }
1007 };
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