1 /* $OpenBSD: rsa_pmeth.c,v 1.33 2021/12/04 16:08:32 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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 <limits.h>
60 #include <stdio.h>
61 #include <string.h>
62
63 #include <openssl/opensslconf.h>
64
65 #include <openssl/asn1t.h>
66 #include <openssl/bn.h>
67 #include <openssl/err.h>
68 #include <openssl/evp.h>
69 #include <openssl/rsa.h>
70 #include <openssl/x509.h>
71 #include <openssl/x509v3.h>
72
73 #include "bn_lcl.h"
74 #include "evp_locl.h"
75 #include "rsa_locl.h"
76
77 /* RSA pkey context structure */
78
79 typedef struct {
80 /* Key gen parameters */
81 int nbits;
82 BIGNUM *pub_exp;
83 /* Keygen callback info */
84 int gentmp[2];
85 /* RSA padding mode */
86 int pad_mode;
87 /* message digest */
88 const EVP_MD *md;
89 /* message digest for MGF1 */
90 const EVP_MD *mgf1md;
91 /* PSS salt length */
92 int saltlen;
93 /* Minimum salt length or -1 if no PSS parameter restriction */
94 int min_saltlen;
95 /* Temp buffer */
96 unsigned char *tbuf;
97 /* OAEP label */
98 unsigned char *oaep_label;
99 size_t oaep_labellen;
100 } RSA_PKEY_CTX;
101
102 /* True if PSS parameters are restricted */
103 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
104
105 static int
pkey_rsa_init(EVP_PKEY_CTX * ctx)106 pkey_rsa_init(EVP_PKEY_CTX *ctx)
107 {
108 RSA_PKEY_CTX *rctx;
109
110 if ((rctx = calloc(1, sizeof(RSA_PKEY_CTX))) == NULL)
111 return 0;
112
113 rctx->nbits = 2048;
114
115 if (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS)
116 rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
117 else
118 rctx->pad_mode = RSA_PKCS1_PADDING;
119
120 /* Maximum for sign, auto for verify */
121 rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
122 rctx->min_saltlen = -1;
123
124 ctx->data = rctx;
125 ctx->keygen_info = rctx->gentmp;
126 ctx->keygen_info_count = 2;
127
128 return 1;
129 }
130
131 static int
pkey_rsa_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)132 pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
133 {
134 RSA_PKEY_CTX *dctx, *sctx;
135
136 if (!pkey_rsa_init(dst))
137 return 0;
138
139 sctx = src->data;
140 dctx = dst->data;
141 dctx->nbits = sctx->nbits;
142 if (sctx->pub_exp != NULL) {
143 BN_free(dctx->pub_exp);
144 if ((dctx->pub_exp = BN_dup(sctx->pub_exp)) == NULL)
145 return 0;
146 }
147 dctx->pad_mode = sctx->pad_mode;
148 dctx->md = sctx->md;
149 dctx->mgf1md = sctx->mgf1md;
150 if (sctx->oaep_label != NULL) {
151 free(dctx->oaep_label);
152 if ((dctx->oaep_label = calloc(1, sctx->oaep_labellen)) == NULL)
153 return 0;
154 memcpy(dctx->oaep_label, sctx->oaep_label, sctx->oaep_labellen);
155 dctx->oaep_labellen = sctx->oaep_labellen;
156 }
157
158 return 1;
159 }
160
161 static int
setup_tbuf(RSA_PKEY_CTX * ctx,EVP_PKEY_CTX * pk)162 setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
163 {
164 if (ctx->tbuf != NULL)
165 return 1;
166 if ((ctx->tbuf = calloc(1, EVP_PKEY_size(pk->pkey))) == NULL) {
167 RSAerror(ERR_R_MALLOC_FAILURE);
168 return 0;
169 }
170 return 1;
171 }
172
173 static void
pkey_rsa_cleanup(EVP_PKEY_CTX * ctx)174 pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
175 {
176 RSA_PKEY_CTX *rctx = ctx->data;
177
178 if (rctx) {
179 BN_free(rctx->pub_exp);
180 free(rctx->tbuf);
181 free(rctx->oaep_label);
182 free(rctx);
183 }
184 }
185
186 static int
pkey_rsa_sign(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,const unsigned char * tbs,size_t tbslen)187 pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
188 const unsigned char *tbs, size_t tbslen)
189 {
190 int ret;
191 RSA_PKEY_CTX *rctx = ctx->data;
192 RSA *rsa = ctx->pkey->pkey.rsa;
193
194 if (rctx->md) {
195 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
196 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);
197 return -1;
198 }
199
200 if (rctx->pad_mode == RSA_X931_PADDING) {
201 if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
202 RSAerror(RSA_R_KEY_SIZE_TOO_SMALL);
203 return -1;
204 }
205 if (!setup_tbuf(rctx, ctx)) {
206 RSAerror(ERR_R_MALLOC_FAILURE);
207 return -1;
208 }
209 memcpy(rctx->tbuf, tbs, tbslen);
210 rctx->tbuf[tbslen] =
211 RSA_X931_hash_id(EVP_MD_type(rctx->md));
212 ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf, sig,
213 rsa, RSA_X931_PADDING);
214 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
215 unsigned int sltmp;
216
217 ret = RSA_sign(EVP_MD_type(rctx->md), tbs, tbslen, sig,
218 &sltmp, rsa);
219 if (ret <= 0)
220 return ret;
221 ret = sltmp;
222 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
223 if (!setup_tbuf(rctx, ctx))
224 return -1;
225 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa, rctx->tbuf,
226 tbs, rctx->md, rctx->mgf1md, rctx->saltlen))
227 return -1;
228 ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
229 sig, rsa, RSA_NO_PADDING);
230 } else {
231 return -1;
232 }
233 } else {
234 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
235 rctx->pad_mode);
236 }
237 if (ret < 0)
238 return ret;
239 *siglen = ret;
240 return 1;
241 }
242
243 static int
pkey_rsa_verifyrecover(EVP_PKEY_CTX * ctx,unsigned char * rout,size_t * routlen,const unsigned char * sig,size_t siglen)244 pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx, unsigned char *rout, size_t *routlen,
245 const unsigned char *sig, size_t siglen)
246 {
247 int ret;
248 RSA_PKEY_CTX *rctx = ctx->data;
249
250 if (rctx->md) {
251 if (rctx->pad_mode == RSA_X931_PADDING) {
252 if (!setup_tbuf(rctx, ctx))
253 return -1;
254 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
255 ctx->pkey->pkey.rsa, RSA_X931_PADDING);
256 if (ret < 1)
257 return 0;
258 ret--;
259 if (rctx->tbuf[ret] !=
260 RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
261 RSAerror(RSA_R_ALGORITHM_MISMATCH);
262 return 0;
263 }
264 if (ret != EVP_MD_size(rctx->md)) {
265 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);
266 return 0;
267 }
268 if (rout)
269 memcpy(rout, rctx->tbuf, ret);
270 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
271 size_t sltmp;
272
273 ret = int_rsa_verify(EVP_MD_type(rctx->md), NULL, 0,
274 rout, &sltmp, sig, siglen, ctx->pkey->pkey.rsa);
275 if (ret <= 0)
276 return 0;
277 ret = sltmp;
278 } else {
279 return -1;
280 }
281 } else {
282 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
283 rctx->pad_mode);
284 }
285 if (ret < 0)
286 return ret;
287 *routlen = ret;
288 return 1;
289 }
290
291 static int
pkey_rsa_verify(EVP_PKEY_CTX * ctx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)292 pkey_rsa_verify(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
293 const unsigned char *tbs, size_t tbslen)
294 {
295 RSA_PKEY_CTX *rctx = ctx->data;
296 RSA *rsa = ctx->pkey->pkey.rsa;
297 size_t rslen;
298
299 if (rctx->md) {
300 if (rctx->pad_mode == RSA_PKCS1_PADDING)
301 return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
302 sig, siglen, rsa);
303 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
304 RSAerror(RSA_R_INVALID_DIGEST_LENGTH);
305 return -1;
306 }
307 if (rctx->pad_mode == RSA_X931_PADDING) {
308 if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig,
309 siglen) <= 0)
310 return 0;
311 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
312 int ret;
313
314 if (!setup_tbuf(rctx, ctx))
315 return -1;
316 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
317 rsa, RSA_NO_PADDING);
318 if (ret <= 0)
319 return 0;
320 ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs, rctx->md,
321 rctx->mgf1md, rctx->tbuf, rctx->saltlen);
322 if (ret <= 0)
323 return 0;
324 return 1;
325 } else {
326 return -1;
327 }
328 } else {
329 if (!setup_tbuf(rctx, ctx))
330 return -1;
331 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf, rsa,
332 rctx->pad_mode);
333 if (rslen == 0)
334 return 0;
335 }
336
337 if (rslen != tbslen || timingsafe_bcmp(tbs, rctx->tbuf, rslen))
338 return 0;
339
340 return 1;
341 }
342
343 static int
pkey_rsa_encrypt(EVP_PKEY_CTX * ctx,unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen)344 pkey_rsa_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
345 const unsigned char *in, size_t inlen)
346 {
347 RSA_PKEY_CTX *rctx = ctx->data;
348 int ret;
349
350 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
351 int klen = RSA_size(ctx->pkey->pkey.rsa);
352 if (!setup_tbuf(rctx, ctx))
353 return -1;
354 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
355 in, inlen, rctx->oaep_label, rctx->oaep_labellen,
356 rctx->md, rctx->mgf1md))
357 return -1;
358 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
359 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
360 } else {
361 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
362 rctx->pad_mode);
363 }
364 if (ret < 0)
365 return ret;
366 *outlen = ret;
367 return 1;
368 }
369
370 static int
pkey_rsa_decrypt(EVP_PKEY_CTX * ctx,unsigned char * out,size_t * outlen,const unsigned char * in,size_t inlen)371 pkey_rsa_decrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
372 const unsigned char *in, size_t inlen)
373 {
374 int ret;
375 RSA_PKEY_CTX *rctx = ctx->data;
376
377 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
378 if (!setup_tbuf(rctx, ctx))
379 return -1;
380 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
381 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
382 if (ret <= 0)
383 return ret;
384 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
385 ret, ret, rctx->oaep_label, rctx->oaep_labellen, rctx->md,
386 rctx->mgf1md);
387 } else {
388 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
389 rctx->pad_mode);
390 }
391 if (ret < 0)
392 return ret;
393 *outlen = ret;
394 return 1;
395 }
396
397 static int
check_padding_md(const EVP_MD * md,int padding)398 check_padding_md(const EVP_MD *md, int padding)
399 {
400 if (md == NULL)
401 return 1;
402
403 if (padding == RSA_NO_PADDING) {
404 RSAerror(RSA_R_INVALID_PADDING_MODE);
405 return 0;
406 }
407
408 if (padding == RSA_X931_PADDING) {
409 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
410 RSAerror(RSA_R_INVALID_X931_DIGEST);
411 return 0;
412 }
413 } else {
414 /* List of all supported RSA digests. */
415 switch(EVP_MD_type(md)) {
416 case NID_sha1:
417 case NID_sha224:
418 case NID_sha256:
419 case NID_sha384:
420 case NID_sha512:
421 case NID_md5:
422 case NID_md5_sha1:
423 case NID_md4:
424 case NID_ripemd160:
425 return 1;
426
427 default:
428 RSAerror(RSA_R_INVALID_DIGEST);
429 return 0;
430 }
431 }
432
433 return 1;
434 }
435
436 static int
pkey_rsa_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)437 pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
438 {
439 RSA_PKEY_CTX *rctx = ctx->data;
440
441 switch (type) {
442 case EVP_PKEY_CTRL_RSA_PADDING:
443 if (p1 >= RSA_PKCS1_PADDING && p1 <= RSA_PKCS1_PSS_PADDING) {
444 if (!check_padding_md(rctx->md, p1))
445 return 0;
446 if (p1 == RSA_PKCS1_PSS_PADDING) {
447 if (!(ctx->operation &
448 (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
449 goto bad_pad;
450 if (!rctx->md)
451 rctx->md = EVP_sha1();
452 } else if (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS) {
453 goto bad_pad;
454 }
455 if (p1 == RSA_PKCS1_OAEP_PADDING) {
456 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
457 goto bad_pad;
458 if (!rctx->md)
459 rctx->md = EVP_sha1();
460 }
461 rctx->pad_mode = p1;
462 return 1;
463 }
464 bad_pad:
465 RSAerror(RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
466 return -2;
467
468 case EVP_PKEY_CTRL_GET_RSA_PADDING:
469 *(int *)p2 = rctx->pad_mode;
470 return 1;
471
472 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
473 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
474 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
475 RSAerror(RSA_R_INVALID_PSS_SALTLEN);
476 return -2;
477 }
478 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
479 *(int *)p2 = rctx->saltlen;
480 } else {
481 if (p1 < RSA_PSS_SALTLEN_MAX)
482 return -2;
483 if (rsa_pss_restricted(rctx)) {
484 if (p1 == RSA_PSS_SALTLEN_AUTO &&
485 ctx->operation == EVP_PKEY_OP_VERIFY) {
486 RSAerror(RSA_R_INVALID_PSS_SALTLEN);
487 return -2;
488 }
489 if ((p1 == RSA_PSS_SALTLEN_DIGEST &&
490 rctx->min_saltlen > EVP_MD_size(rctx->md)) ||
491 (p1 >= 0 && p1 < rctx->min_saltlen)) {
492 RSAerror(RSA_R_PSS_SALTLEN_TOO_SMALL);
493 return 0;
494 }
495 }
496 rctx->saltlen = p1;
497 }
498 return 1;
499
500 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
501 if (p1 < RSA_MIN_MODULUS_BITS) {
502 RSAerror(RSA_R_KEY_SIZE_TOO_SMALL);
503 return -2;
504 }
505 rctx->nbits = p1;
506 return 1;
507
508 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
509 if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) ||
510 BN_is_one((BIGNUM *)p2)) {
511 RSAerror(RSA_R_BAD_E_VALUE);
512 return -2;
513 }
514 BN_free(rctx->pub_exp);
515 rctx->pub_exp = p2;
516 return 1;
517
518 case EVP_PKEY_CTRL_RSA_OAEP_MD:
519 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
520 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
521 RSAerror(RSA_R_INVALID_PADDING_MODE);
522 return -2;
523 }
524 if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
525 *(const EVP_MD **)p2 = rctx->md;
526 else
527 rctx->md = p2;
528 return 1;
529
530 case EVP_PKEY_CTRL_MD:
531 if (!check_padding_md(p2, rctx->pad_mode))
532 return 0;
533 if (rsa_pss_restricted(rctx)) {
534 if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
535 return 1;
536 RSAerror(RSA_R_DIGEST_NOT_ALLOWED);
537 return 0;
538 }
539 rctx->md = p2;
540 return 1;
541
542 case EVP_PKEY_CTRL_GET_MD:
543 *(const EVP_MD **)p2 = rctx->md;
544 return 1;
545
546 case EVP_PKEY_CTRL_RSA_MGF1_MD:
547 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
548 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING &&
549 rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
550 RSAerror(RSA_R_INVALID_MGF1_MD);
551 return -2;
552 }
553 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
554 if (rctx->mgf1md)
555 *(const EVP_MD **)p2 = rctx->mgf1md;
556 else
557 *(const EVP_MD **)p2 = rctx->md;
558 } else {
559 if (rsa_pss_restricted(rctx)) {
560 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
561 return 1;
562 RSAerror(RSA_R_MGF1_DIGEST_NOT_ALLOWED);
563 return 0;
564 }
565 rctx->mgf1md = p2;
566 }
567 return 1;
568
569 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
570 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
571 RSAerror(RSA_R_INVALID_PADDING_MODE);
572 return -2;
573 }
574 free(rctx->oaep_label);
575 if (p2 != NULL && p1 > 0) {
576 rctx->oaep_label = p2;
577 rctx->oaep_labellen = p1;
578 } else {
579 rctx->oaep_label = NULL;
580 rctx->oaep_labellen = 0;
581 }
582 return 1;
583
584 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
585 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
586 RSAerror(RSA_R_INVALID_PADDING_MODE);
587 return -2;
588 }
589 *(unsigned char **)p2 = rctx->oaep_label;
590 return rctx->oaep_labellen;
591
592 case EVP_PKEY_CTRL_DIGESTINIT:
593 case EVP_PKEY_CTRL_PKCS7_SIGN:
594 #ifndef OPENSSL_NO_CMS
595 case EVP_PKEY_CTRL_CMS_SIGN:
596 #endif
597 return 1;
598
599 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
600 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
601 #ifndef OPENSSL_NO_CMS
602 case EVP_PKEY_CTRL_CMS_DECRYPT:
603 case EVP_PKEY_CTRL_CMS_ENCRYPT:
604 #endif
605 if (ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
606 return 1;
607
608 /* fall through */
609 case EVP_PKEY_CTRL_PEER_KEY:
610 RSAerror(RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
611 return -2;
612
613 default:
614 return -2;
615
616 }
617 }
618
619 static int
pkey_rsa_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)620 pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
621 {
622 if (!value) {
623 RSAerror(RSA_R_VALUE_MISSING);
624 return 0;
625 }
626 if (!strcmp(type, "rsa_padding_mode")) {
627 int pm;
628 if (!strcmp(value, "pkcs1"))
629 pm = RSA_PKCS1_PADDING;
630 else if (!strcmp(value, "none"))
631 pm = RSA_NO_PADDING;
632 else if (!strcmp(value, "oeap"))
633 pm = RSA_PKCS1_OAEP_PADDING;
634 else if (!strcmp(value, "oaep"))
635 pm = RSA_PKCS1_OAEP_PADDING;
636 else if (!strcmp(value, "x931"))
637 pm = RSA_X931_PADDING;
638 else if (!strcmp(value, "pss"))
639 pm = RSA_PKCS1_PSS_PADDING;
640 else {
641 RSAerror(RSA_R_UNKNOWN_PADDING_TYPE);
642 return -2;
643 }
644 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
645 }
646
647 if (strcmp(type, "rsa_pss_saltlen") == 0) {
648 int saltlen;
649
650 if (!strcmp(value, "digest"))
651 saltlen = RSA_PSS_SALTLEN_DIGEST;
652 else if (!strcmp(value, "max"))
653 saltlen = RSA_PSS_SALTLEN_MAX;
654 else if (!strcmp(value, "auto"))
655 saltlen = RSA_PSS_SALTLEN_AUTO;
656 else
657 saltlen = atoi(value);
658 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
659 }
660
661 if (strcmp(type, "rsa_keygen_bits") == 0) {
662 int nbits = atoi(value);
663
664 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
665 }
666
667 if (strcmp(type, "rsa_keygen_pubexp") == 0) {
668 BIGNUM *pubexp = NULL;
669 int ret;
670
671 if (!BN_asc2bn(&pubexp, value))
672 return 0;
673 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
674 if (ret <= 0)
675 BN_free(pubexp);
676 return ret;
677 }
678
679 if (strcmp(type, "rsa_mgf1_md") == 0)
680 return EVP_PKEY_CTX_md(ctx,
681 EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
682 EVP_PKEY_CTRL_RSA_MGF1_MD, value);
683
684 if (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS) {
685 if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
686 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
687 EVP_PKEY_CTRL_RSA_MGF1_MD, value);
688
689 if (strcmp(type, "rsa_pss_keygen_md") == 0)
690 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
691 EVP_PKEY_CTRL_MD, value);
692
693 if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
694 int saltlen = atoi(value);
695
696 return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
697 }
698 }
699
700 if (strcmp(type, "rsa_oaep_md") == 0)
701 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
702 EVP_PKEY_CTRL_RSA_OAEP_MD, value);
703
704 if (strcmp(type, "rsa_oaep_label") == 0) {
705 unsigned char *lab;
706 long lablen;
707 int ret;
708
709 if ((lab = string_to_hex(value, &lablen)) == NULL)
710 return 0;
711 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
712 if (ret <= 0)
713 free(lab);
714
715 return ret;
716 }
717
718 return -2;
719 }
720
721 /* Set PSS parameters when generating a key, if necessary. */
722 static int
rsa_set_pss_param(RSA * rsa,EVP_PKEY_CTX * ctx)723 rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
724 {
725 RSA_PKEY_CTX *rctx = ctx->data;
726
727 if (ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
728 return 1;
729
730 /* If all parameters are default values then do not set PSS. */
731 if (rctx->md == NULL && rctx->mgf1md == NULL &&
732 rctx->saltlen == RSA_PSS_SALTLEN_AUTO)
733 return 1;
734
735 rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
736 rctx->saltlen == RSA_PSS_SALTLEN_AUTO ? 0 : rctx->saltlen);
737 if (rsa->pss == NULL)
738 return 0;
739
740 return 1;
741 }
742
743 static int
pkey_rsa_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)744 pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
745 {
746 RSA *rsa = NULL;
747 RSA_PKEY_CTX *rctx = ctx->data;
748 BN_GENCB *pcb, cb;
749 int ret;
750
751 if (rctx->pub_exp == NULL) {
752 if ((rctx->pub_exp = BN_new()) == NULL)
753 return 0;
754 if (!BN_set_word(rctx->pub_exp, RSA_F4))
755 return 0;
756 }
757 if ((rsa = RSA_new()) == NULL)
758 return 0;
759 if (ctx->pkey_gencb != NULL) {
760 pcb = &cb;
761 evp_pkey_set_cb_translate(pcb, ctx);
762 } else {
763 pcb = NULL;
764 }
765 ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
766 if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
767 RSA_free(rsa);
768 return 0;
769 }
770 if (ret > 0)
771 EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
772 else
773 RSA_free(rsa);
774 return ret;
775 }
776
777 const EVP_PKEY_METHOD rsa_pkey_meth = {
778 .pkey_id = EVP_PKEY_RSA,
779 .flags = EVP_PKEY_FLAG_AUTOARGLEN,
780
781 .init = pkey_rsa_init,
782 .copy = pkey_rsa_copy,
783 .cleanup = pkey_rsa_cleanup,
784
785 .keygen = pkey_rsa_keygen,
786
787 .sign = pkey_rsa_sign,
788
789 .verify = pkey_rsa_verify,
790
791 .verify_recover = pkey_rsa_verifyrecover,
792
793 .encrypt = pkey_rsa_encrypt,
794
795 .decrypt = pkey_rsa_decrypt,
796
797 .ctrl = pkey_rsa_ctrl,
798 .ctrl_str = pkey_rsa_ctrl_str
799 };
800
801 /*
802 * Called for PSS sign or verify initialisation: checks PSS parameter
803 * sanity and sets any restrictions on key usage.
804 */
805
806 static int
pkey_pss_init(EVP_PKEY_CTX * ctx)807 pkey_pss_init(EVP_PKEY_CTX *ctx)
808 {
809 RSA *rsa;
810 RSA_PKEY_CTX *rctx = ctx->data;
811 const EVP_MD *md;
812 const EVP_MD *mgf1md;
813 int min_saltlen, max_saltlen;
814
815 /* Should never happen */
816 if (ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
817 return 0;
818 rsa = ctx->pkey->pkey.rsa;
819
820 /* If no restrictions just return */
821 if (rsa->pss == NULL)
822 return 1;
823
824 /* Get and check parameters */
825 if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
826 return 0;
827
828 /* See if minimum salt length exceeds maximum possible */
829 max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
830 if ((RSA_bits(rsa) & 0x7) == 1)
831 max_saltlen--;
832 if (min_saltlen > max_saltlen) {
833 RSAerror(RSA_R_INVALID_SALT_LENGTH);
834 return 0;
835 }
836 rctx->min_saltlen = min_saltlen;
837
838 /*
839 * Set PSS restrictions as defaults: we can then block any attempt to
840 * use invalid values in pkey_rsa_ctrl
841 */
842
843 rctx->md = md;
844 rctx->mgf1md = mgf1md;
845 rctx->saltlen = min_saltlen;
846
847 return 1;
848 }
849
850 const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
851 .pkey_id = EVP_PKEY_RSA_PSS,
852 .flags = EVP_PKEY_FLAG_AUTOARGLEN,
853
854 .init = pkey_rsa_init,
855 .copy = pkey_rsa_copy,
856 .cleanup = pkey_rsa_cleanup,
857
858 .keygen = pkey_rsa_keygen,
859
860 .sign_init = pkey_pss_init,
861 .sign = pkey_rsa_sign,
862
863 .verify_init = pkey_pss_init,
864 .verify = pkey_rsa_verify,
865
866 .ctrl = pkey_rsa_ctrl,
867 .ctrl_str = pkey_rsa_ctrl_str
868 };
869
870