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Fix coverity CID #1458641 - Dereference before NULL check when setting ctx->flag_allo...
[thirdparty/openssl.git] / providers / implementations / signature / rsa.c
1 /*
2 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * RSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <string.h>
17 #include <openssl/crypto.h>
18 #include <openssl/core_dispatch.h>
19 #include <openssl/core_names.h>
20 #include <openssl/err.h>
21 #include <openssl/rsa.h>
22 #include <openssl/params.h>
23 #include <openssl/evp.h>
24 #include "internal/cryptlib.h"
25 #include "internal/nelem.h"
26 #include "internal/sizes.h"
27 #include "crypto/rsa.h"
28 #include "prov/providercommonerr.h"
29 #include "prov/implementations.h"
30 #include "prov/provider_ctx.h"
31 #include "prov/der_rsa.h"
32
33 static OSSL_FUNC_signature_newctx_fn rsa_newctx;
34 static OSSL_FUNC_signature_sign_init_fn rsa_sign_init;
35 static OSSL_FUNC_signature_verify_init_fn rsa_verify_init;
36 static OSSL_FUNC_signature_verify_recover_init_fn rsa_verify_recover_init;
37 static OSSL_FUNC_signature_sign_fn rsa_sign;
38 static OSSL_FUNC_signature_verify_fn rsa_verify;
39 static OSSL_FUNC_signature_verify_recover_fn rsa_verify_recover;
40 static OSSL_FUNC_signature_digest_sign_init_fn rsa_digest_sign_init;
41 static OSSL_FUNC_signature_digest_sign_update_fn rsa_digest_signverify_update;
42 static OSSL_FUNC_signature_digest_sign_final_fn rsa_digest_sign_final;
43 static OSSL_FUNC_signature_digest_verify_init_fn rsa_digest_verify_init;
44 static OSSL_FUNC_signature_digest_verify_update_fn rsa_digest_signverify_update;
45 static OSSL_FUNC_signature_digest_verify_final_fn rsa_digest_verify_final;
46 static OSSL_FUNC_signature_freectx_fn rsa_freectx;
47 static OSSL_FUNC_signature_dupctx_fn rsa_dupctx;
48 static OSSL_FUNC_signature_get_ctx_params_fn rsa_get_ctx_params;
49 static OSSL_FUNC_signature_gettable_ctx_params_fn rsa_gettable_ctx_params;
50 static OSSL_FUNC_signature_set_ctx_params_fn rsa_set_ctx_params;
51 static OSSL_FUNC_signature_settable_ctx_params_fn rsa_settable_ctx_params;
52 static OSSL_FUNC_signature_get_ctx_md_params_fn rsa_get_ctx_md_params;
53 static OSSL_FUNC_signature_gettable_ctx_md_params_fn rsa_gettable_ctx_md_params;
54 static OSSL_FUNC_signature_set_ctx_md_params_fn rsa_set_ctx_md_params;
55 static OSSL_FUNC_signature_settable_ctx_md_params_fn rsa_settable_ctx_md_params;
56
57 static OSSL_ITEM padding_item[] = {
58 { RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
59 { RSA_SSLV23_PADDING, OSSL_PKEY_RSA_PAD_MODE_SSLV23 },
60 { RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
61 { RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
62 { RSA_PKCS1_PSS_PADDING, OSSL_PKEY_RSA_PAD_MODE_PSS },
63 { 0, NULL }
64 };
65
66 /*
67 * What's passed as an actual key is defined by the KEYMGMT interface.
68 * We happen to know that our KEYMGMT simply passes RSA structures, so
69 * we use that here too.
70 */
71
72 typedef struct {
73 OPENSSL_CTX *libctx;
74 char *propq;
75 RSA *rsa;
76 int operation;
77
78 /*
79 * Flag to determine if the hash function can be changed (1) or not (0)
80 * Because it's dangerous to change during a DigestSign or DigestVerify
81 * operation, this flag is cleared by their Init function, and set again
82 * by their Final function.
83 */
84 unsigned int flag_allow_md : 1;
85
86 /* The Algorithm Identifier of the combined signature agorithm */
87 unsigned char aid_buf[128];
88 unsigned char *aid;
89 size_t aid_len;
90
91 /* main digest */
92 EVP_MD *md;
93 EVP_MD_CTX *mdctx;
94 int mdnid;
95 char mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
96
97 /* RSA padding mode */
98 int pad_mode;
99 /* message digest for MGF1 */
100 EVP_MD *mgf1_md;
101 char mgf1_mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
102 /* PSS salt length */
103 int saltlen;
104 /* Minimum salt length or -1 if no PSS parameter restriction */
105 int min_saltlen;
106
107 /* Temp buffer */
108 unsigned char *tbuf;
109
110 } PROV_RSA_CTX;
111
112 static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
113 {
114 if (prsactx->md != NULL)
115 return EVP_MD_size(prsactx->md);
116 return 0;
117 }
118
119 static int rsa_get_md_nid(const EVP_MD *md)
120 {
121 /*
122 * Because the RSA library deals with NIDs, we need to translate.
123 * We do so using EVP_MD_is_a(), and therefore need a name to NID
124 * map.
125 */
126 static const OSSL_ITEM name_to_nid[] = {
127 { NID_sha1, OSSL_DIGEST_NAME_SHA1 },
128 { NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
129 { NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
130 { NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
131 { NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
132 { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },
133 { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },
134 { NID_md5, OSSL_DIGEST_NAME_MD5 },
135 { NID_md5_sha1, OSSL_DIGEST_NAME_MD5_SHA1 },
136 { NID_md2, OSSL_DIGEST_NAME_MD2 },
137 { NID_md4, OSSL_DIGEST_NAME_MD4 },
138 { NID_mdc2, OSSL_DIGEST_NAME_MDC2 },
139 { NID_ripemd160, OSSL_DIGEST_NAME_RIPEMD160 },
140 { NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
141 { NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
142 { NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
143 { NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
144 };
145 size_t i;
146 int mdnid = NID_undef;
147
148 if (md == NULL)
149 goto end;
150
151 for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
152 if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
153 mdnid = (int)name_to_nid[i].id;
154 break;
155 }
156 }
157
158 end:
159 return mdnid;
160 }
161
162 static int rsa_check_padding(int mdnid, int padding)
163 {
164 if (padding == RSA_NO_PADDING) {
165 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE);
166 return 0;
167 }
168
169 if (padding == RSA_X931_PADDING) {
170 if (RSA_X931_hash_id(mdnid) == -1) {
171 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_X931_DIGEST);
172 return 0;
173 }
174 }
175
176 return 1;
177 }
178
179 static int rsa_check_parameters(PROV_RSA_CTX *prsactx)
180 {
181 if (prsactx->pad_mode == RSA_PKCS1_PSS_PADDING) {
182 int max_saltlen;
183
184 /* See if minimum salt length exceeds maximum possible */
185 max_saltlen = RSA_size(prsactx->rsa) - EVP_MD_size(prsactx->md);
186 if ((RSA_bits(prsactx->rsa) & 0x7) == 1)
187 max_saltlen--;
188 if (prsactx->min_saltlen < 0 || prsactx->min_saltlen > max_saltlen) {
189 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
190 return 0;
191 }
192 }
193 return 1;
194 }
195
196 static void *rsa_newctx(void *provctx, const char *propq)
197 {
198 PROV_RSA_CTX *prsactx = NULL;
199 char *propq_copy = NULL;
200
201 if ((prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX))) == NULL
202 || (propq != NULL
203 && (propq_copy = OPENSSL_strdup(propq)) == NULL)) {
204 OPENSSL_free(prsactx);
205 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
206 return NULL;
207 }
208
209 prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
210 prsactx->flag_allow_md = 1;
211 prsactx->propq = propq_copy;
212 return prsactx;
213 }
214
215 /* True if PSS parameters are restricted */
216 #define rsa_pss_restricted(prsactx) (prsactx->min_saltlen != -1)
217
218 static int rsa_setup_md(PROV_RSA_CTX *ctx, const char *mdname,
219 const char *mdprops)
220 {
221 if (mdprops == NULL)
222 mdprops = ctx->propq;
223
224 if (mdname != NULL) {
225 EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
226 int md_nid = rsa_get_md_nid(md);
227 WPACKET pkt;
228 size_t mdname_len = strlen(mdname);
229
230 if (md == NULL
231 || md_nid == NID_undef
232 || !rsa_check_padding(md_nid, ctx->pad_mode)
233 || mdname_len >= sizeof(ctx->mdname)) {
234 if (md == NULL)
235 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
236 "%s could not be fetched", mdname);
237 if (md_nid == NID_undef)
238 ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
239 "digest=%s", mdname);
240 if (mdname_len >= sizeof(ctx->mdname))
241 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
242 "%s exceeds name buffer length", mdname);
243 EVP_MD_free(md);
244 return 0;
245 }
246
247 EVP_MD_CTX_free(ctx->mdctx);
248 EVP_MD_free(ctx->md);
249
250 /*
251 * TODO(3.0) Should we care about DER writing errors?
252 * All it really means is that for some reason, there's no
253 * AlgorithmIdentifier to be had (consider RSA with MD5-SHA1),
254 * but the operation itself is still valid, just as long as it's
255 * not used to construct anything that needs an AlgorithmIdentifier.
256 */
257 ctx->aid_len = 0;
258 if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
259 && DER_w_algorithmIdentifier_MDWithRSAEncryption(&pkt, -1, ctx->rsa,
260 md_nid)
261 && WPACKET_finish(&pkt)) {
262 WPACKET_get_total_written(&pkt, &ctx->aid_len);
263 ctx->aid = WPACKET_get_curr(&pkt);
264 }
265 WPACKET_cleanup(&pkt);
266
267 ctx->mdctx = NULL;
268 ctx->md = md;
269 ctx->mdnid = md_nid;
270 OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
271 }
272
273 return 1;
274 }
275
276 static int rsa_setup_mgf1_md(PROV_RSA_CTX *ctx, const char *mdname,
277 const char *mdprops)
278 {
279 size_t len;
280
281 if (mdprops == NULL)
282 mdprops = ctx->propq;
283
284 if (ctx->mgf1_mdname[0] != '\0')
285 EVP_MD_free(ctx->mgf1_md);
286
287 if ((ctx->mgf1_md = EVP_MD_fetch(ctx->libctx, mdname, mdprops)) == NULL) {
288 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
289 "%s could not be fetched", mdname);
290 return 0;
291 }
292 len = OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
293 if (len >= sizeof(ctx->mgf1_mdname)) {
294 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
295 "%s exceeds name buffer length", mdname);
296 return 0;
297 }
298
299 return 1;
300 }
301
302 static int rsa_signature_init(void *vprsactx, void *vrsa, int operation)
303 {
304 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
305
306 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
307 return 0;
308
309 RSA_free(prsactx->rsa);
310 prsactx->rsa = vrsa;
311 prsactx->operation = operation;
312
313 /* Maximum for sign, auto for verify */
314 prsactx->saltlen = RSA_PSS_SALTLEN_AUTO;
315 prsactx->min_saltlen = -1;
316
317 switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
318 case RSA_FLAG_TYPE_RSA:
319 prsactx->pad_mode = RSA_PKCS1_PADDING;
320 break;
321 case RSA_FLAG_TYPE_RSASSAPSS:
322 prsactx->pad_mode = RSA_PKCS1_PSS_PADDING;
323
324 {
325 const RSA_PSS_PARAMS_30 *pss =
326 rsa_get0_pss_params_30(prsactx->rsa);
327
328 if (!rsa_pss_params_30_is_unrestricted(pss)) {
329 int md_nid = rsa_pss_params_30_hashalg(pss);
330 int mgf1md_nid = rsa_pss_params_30_maskgenhashalg(pss);
331 int min_saltlen = rsa_pss_params_30_saltlen(pss);
332 const char *mdname, *mgf1mdname;
333 size_t len;
334
335 mdname = rsa_oaeppss_nid2name(md_nid);
336 mgf1mdname = rsa_oaeppss_nid2name(mgf1md_nid);
337 prsactx->min_saltlen = min_saltlen;
338
339 if (mdname == NULL) {
340 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
341 "PSS restrictions lack hash algorithm");
342 return 0;
343 }
344 if (mgf1mdname == NULL) {
345 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
346 "PSS restrictions lack MGF1 hash algorithm");
347 return 0;
348 }
349
350 len = OPENSSL_strlcpy(prsactx->mdname, mdname,
351 sizeof(prsactx->mdname));
352 if (len >= sizeof(prsactx->mdname)) {
353 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
354 "hash algorithm name too long");
355 return 0;
356 }
357 len = OPENSSL_strlcpy(prsactx->mgf1_mdname, mgf1mdname,
358 sizeof(prsactx->mgf1_mdname));
359 if (len >= sizeof(prsactx->mgf1_mdname)) {
360 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
361 "MGF1 hash algorithm name too long");
362 return 0;
363 }
364 prsactx->saltlen = min_saltlen;
365
366 return rsa_setup_md(prsactx, mdname, prsactx->propq)
367 && rsa_setup_mgf1_md(prsactx, mgf1mdname, prsactx->propq)
368 && rsa_check_parameters(prsactx);
369 }
370 }
371
372 break;
373 default:
374 ERR_raise(ERR_LIB_RSA, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
375 return 0;
376 }
377
378 return 1;
379 }
380
381 static int setup_tbuf(PROV_RSA_CTX *ctx)
382 {
383 if (ctx->tbuf != NULL)
384 return 1;
385 if ((ctx->tbuf = OPENSSL_malloc(RSA_size(ctx->rsa))) == NULL) {
386 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
387 return 0;
388 }
389 return 1;
390 }
391
392 static void clean_tbuf(PROV_RSA_CTX *ctx)
393 {
394 if (ctx->tbuf != NULL)
395 OPENSSL_cleanse(ctx->tbuf, RSA_size(ctx->rsa));
396 }
397
398 static void free_tbuf(PROV_RSA_CTX *ctx)
399 {
400 clean_tbuf(ctx);
401 OPENSSL_free(ctx->tbuf);
402 ctx->tbuf = NULL;
403 }
404
405 static int rsa_sign_init(void *vprsactx, void *vrsa)
406 {
407 return rsa_signature_init(vprsactx, vrsa, EVP_PKEY_OP_SIGN);
408 }
409
410 static int rsa_sign(void *vprsactx, unsigned char *sig, size_t *siglen,
411 size_t sigsize, const unsigned char *tbs, size_t tbslen)
412 {
413 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
414 int ret;
415 size_t rsasize = RSA_size(prsactx->rsa);
416 size_t mdsize = rsa_get_md_size(prsactx);
417
418 if (sig == NULL) {
419 *siglen = rsasize;
420 return 1;
421 }
422
423 if (sigsize < rsasize) {
424 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SIGNATURE_SIZE,
425 "is %zu, should be at least %zu", sigsize, rsasize);
426 return 0;
427 }
428
429 if (mdsize != 0) {
430 if (tbslen != mdsize) {
431 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH);
432 return 0;
433 }
434
435 #ifndef FIPS_MODULE
436 if (EVP_MD_is_a(prsactx->md, OSSL_DIGEST_NAME_MDC2)) {
437 unsigned int sltmp;
438
439 if (prsactx->pad_mode != RSA_PKCS1_PADDING) {
440 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
441 "only PKCS#1 padding supported with MDC2");
442 return 0;
443 }
444 ret = RSA_sign_ASN1_OCTET_STRING(0, tbs, tbslen, sig, &sltmp,
445 prsactx->rsa);
446
447 if (ret <= 0) {
448 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
449 return 0;
450 }
451 ret = sltmp;
452 goto end;
453 }
454 #endif
455 switch (prsactx->pad_mode) {
456 case RSA_X931_PADDING:
457 if ((size_t)RSA_size(prsactx->rsa) < tbslen + 1) {
458 ERR_raise_data(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL,
459 "RSA key size = %d, expected minimum = %d",
460 RSA_size(prsactx->rsa), tbslen + 1);
461 return 0;
462 }
463 if (!setup_tbuf(prsactx)) {
464 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
465 return 0;
466 }
467 memcpy(prsactx->tbuf, tbs, tbslen);
468 prsactx->tbuf[tbslen] = RSA_X931_hash_id(prsactx->mdnid);
469 ret = RSA_private_encrypt(tbslen + 1, prsactx->tbuf,
470 sig, prsactx->rsa, RSA_X931_PADDING);
471 clean_tbuf(prsactx);
472 break;
473
474 case RSA_PKCS1_PADDING:
475 {
476 unsigned int sltmp;
477
478 ret = RSA_sign(prsactx->mdnid, tbs, tbslen, sig, &sltmp,
479 prsactx->rsa);
480 if (ret <= 0) {
481 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
482 return 0;
483 }
484 ret = sltmp;
485 }
486 break;
487
488 case RSA_PKCS1_PSS_PADDING:
489 /* Check PSS restrictions */
490 if (rsa_pss_restricted(prsactx)) {
491 switch (prsactx->saltlen) {
492 case RSA_PSS_SALTLEN_DIGEST:
493 if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
494 ERR_raise_data(ERR_LIB_PROV,
495 PROV_R_PSS_SALTLEN_TOO_SMALL,
496 "minimum salt length set to %d, "
497 "but the digest only gives %d",
498 prsactx->min_saltlen,
499 EVP_MD_size(prsactx->md));
500 return 0;
501 }
502 /* FALLTHRU */
503 default:
504 if (prsactx->saltlen >= 0
505 && prsactx->saltlen < prsactx->min_saltlen) {
506 ERR_raise_data(ERR_LIB_PROV,
507 PROV_R_PSS_SALTLEN_TOO_SMALL,
508 "minimum salt length set to %d, but the"
509 "actual salt length is only set to %d",
510 prsactx->min_saltlen,
511 prsactx->saltlen);
512 return 0;
513 }
514 break;
515 }
516 }
517 if (!setup_tbuf(prsactx))
518 return 0;
519 if (!RSA_padding_add_PKCS1_PSS_mgf1(prsactx->rsa,
520 prsactx->tbuf, tbs,
521 prsactx->md, prsactx->mgf1_md,
522 prsactx->saltlen)) {
523 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
524 return 0;
525 }
526 ret = RSA_private_encrypt(RSA_size(prsactx->rsa), prsactx->tbuf,
527 sig, prsactx->rsa, RSA_NO_PADDING);
528 clean_tbuf(prsactx);
529 break;
530
531 default:
532 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
533 "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
534 return 0;
535 }
536 } else {
537 ret = RSA_private_encrypt(tbslen, tbs, sig, prsactx->rsa,
538 prsactx->pad_mode);
539 }
540
541 #ifndef FIPS_MODULE
542 end:
543 #endif
544 if (ret <= 0) {
545 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
546 return 0;
547 }
548
549 *siglen = ret;
550 return 1;
551 }
552
553 static int rsa_verify_recover_init(void *vprsactx, void *vrsa)
554 {
555 return rsa_signature_init(vprsactx, vrsa, EVP_PKEY_OP_VERIFYRECOVER);
556 }
557
558 static int rsa_verify_recover(void *vprsactx,
559 unsigned char *rout,
560 size_t *routlen,
561 size_t routsize,
562 const unsigned char *sig,
563 size_t siglen)
564 {
565 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
566 int ret;
567
568 if (rout == NULL) {
569 *routlen = RSA_size(prsactx->rsa);
570 return 1;
571 }
572
573 if (prsactx->md != NULL) {
574 switch (prsactx->pad_mode) {
575 case RSA_X931_PADDING:
576 if (!setup_tbuf(prsactx))
577 return 0;
578 ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
579 RSA_X931_PADDING);
580 if (ret < 1) {
581 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
582 return 0;
583 }
584 ret--;
585 if (prsactx->tbuf[ret] != RSA_X931_hash_id(prsactx->mdnid)) {
586 ERR_raise(ERR_LIB_PROV, PROV_R_ALGORITHM_MISMATCH);
587 return 0;
588 }
589 if (ret != EVP_MD_size(prsactx->md)) {
590 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
591 "Should be %d, but got %d",
592 EVP_MD_size(prsactx->md), ret);
593 return 0;
594 }
595
596 *routlen = ret;
597 if (rout != prsactx->tbuf) {
598 if (routsize < (size_t)ret) {
599 ERR_raise_data(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL,
600 "buffer size is %d, should be %d",
601 routsize, ret);
602 return 0;
603 }
604 memcpy(rout, prsactx->tbuf, ret);
605 }
606 break;
607
608 case RSA_PKCS1_PADDING:
609 {
610 size_t sltmp;
611
612 ret = int_rsa_verify(prsactx->mdnid, NULL, 0, rout, &sltmp,
613 sig, siglen, prsactx->rsa);
614 if (ret <= 0) {
615 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
616 return 0;
617 }
618 ret = sltmp;
619 }
620 break;
621
622 default:
623 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
624 "Only X.931 or PKCS#1 v1.5 padding allowed");
625 return 0;
626 }
627 } else {
628 ret = RSA_public_decrypt(siglen, sig, rout, prsactx->rsa,
629 prsactx->pad_mode);
630 if (ret < 0) {
631 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
632 return 0;
633 }
634 }
635 *routlen = ret;
636 return 1;
637 }
638
639 static int rsa_verify_init(void *vprsactx, void *vrsa)
640 {
641 return rsa_signature_init(vprsactx, vrsa, EVP_PKEY_OP_VERIFY);
642 }
643
644 static int rsa_verify(void *vprsactx, const unsigned char *sig, size_t siglen,
645 const unsigned char *tbs, size_t tbslen)
646 {
647 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
648 size_t rslen;
649
650 if (prsactx->md != NULL) {
651 switch (prsactx->pad_mode) {
652 case RSA_PKCS1_PADDING:
653 if (!RSA_verify(prsactx->mdnid, tbs, tbslen, sig, siglen,
654 prsactx->rsa)) {
655 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
656 return 0;
657 }
658 return 1;
659 case RSA_X931_PADDING:
660 if (!setup_tbuf(prsactx))
661 return 0;
662 if (rsa_verify_recover(prsactx, prsactx->tbuf, &rslen, 0,
663 sig, siglen) <= 0)
664 return 0;
665 break;
666 case RSA_PKCS1_PSS_PADDING:
667 {
668 int ret;
669 size_t mdsize;
670
671 /*
672 * We need to check this for the RSA_verify_PKCS1_PSS_mgf1()
673 * call
674 */
675 mdsize = rsa_get_md_size(prsactx);
676 if (tbslen != mdsize) {
677 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
678 "Should be %d, but got %d",
679 mdsize, tbslen);
680 return 0;
681 }
682
683 if (!setup_tbuf(prsactx))
684 return 0;
685 ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf,
686 prsactx->rsa, RSA_NO_PADDING);
687 if (ret <= 0) {
688 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
689 return 0;
690 }
691 ret = RSA_verify_PKCS1_PSS_mgf1(prsactx->rsa, tbs,
692 prsactx->md, prsactx->mgf1_md,
693 prsactx->tbuf,
694 prsactx->saltlen);
695 if (ret <= 0) {
696 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
697 return 0;
698 }
699 return 1;
700 }
701 default:
702 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
703 "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
704 return 0;
705 }
706 } else {
707 if (!setup_tbuf(prsactx))
708 return 0;
709 rslen = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
710 prsactx->pad_mode);
711 if (rslen == 0) {
712 ERR_raise(ERR_LIB_PROV, ERR_LIB_RSA);
713 return 0;
714 }
715 }
716
717 if ((rslen != tbslen) || memcmp(tbs, prsactx->tbuf, rslen))
718 return 0;
719
720 return 1;
721 }
722
723 static int rsa_digest_signverify_init(void *vprsactx, const char *mdname,
724 void *vrsa, int operation)
725 {
726 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
727
728 if (prsactx != NULL)
729 prsactx->flag_allow_md = 0;
730 if (!rsa_signature_init(vprsactx, vrsa, operation)
731 || !rsa_setup_md(prsactx, mdname, NULL)) /* TODO RL */
732 return 0;
733
734 prsactx->mdctx = EVP_MD_CTX_new();
735 if (prsactx->mdctx == NULL) {
736 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
737 goto error;
738 }
739
740 if (!EVP_DigestInit_ex(prsactx->mdctx, prsactx->md, NULL))
741 goto error;
742
743 return 1;
744
745 error:
746 EVP_MD_CTX_free(prsactx->mdctx);
747 EVP_MD_free(prsactx->md);
748 prsactx->mdctx = NULL;
749 prsactx->md = NULL;
750 return 0;
751 }
752
753 static int rsa_digest_signverify_update(void *vprsactx,
754 const unsigned char *data,
755 size_t datalen)
756 {
757 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
758
759 if (prsactx == NULL || prsactx->mdctx == NULL)
760 return 0;
761
762 return EVP_DigestUpdate(prsactx->mdctx, data, datalen);
763 }
764
765 static int rsa_digest_sign_init(void *vprsactx, const char *mdname,
766 void *vrsa)
767 {
768 return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
769 EVP_PKEY_OP_SIGN);
770 }
771
772 static int rsa_digest_sign_final(void *vprsactx, unsigned char *sig,
773 size_t *siglen, size_t sigsize)
774 {
775 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
776 unsigned char digest[EVP_MAX_MD_SIZE];
777 unsigned int dlen = 0;
778
779 if (prsactx == NULL)
780 return 0;
781 prsactx->flag_allow_md = 1;
782 if (prsactx->mdctx == NULL)
783 return 0;
784 /*
785 * If sig is NULL then we're just finding out the sig size. Other fields
786 * are ignored. Defer to rsa_sign.
787 */
788 if (sig != NULL) {
789 /*
790 * TODO(3.0): There is the possibility that some externally provided
791 * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
792 * but that problem is much larger than just in RSA.
793 */
794 if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
795 return 0;
796 }
797
798 return rsa_sign(vprsactx, sig, siglen, sigsize, digest, (size_t)dlen);
799 }
800
801 static int rsa_digest_verify_init(void *vprsactx, const char *mdname,
802 void *vrsa)
803 {
804 return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
805 EVP_PKEY_OP_VERIFY);
806 }
807
808 int rsa_digest_verify_final(void *vprsactx, const unsigned char *sig,
809 size_t siglen)
810 {
811 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
812 unsigned char digest[EVP_MAX_MD_SIZE];
813 unsigned int dlen = 0;
814
815 if (prsactx == NULL)
816 return 0;
817 prsactx->flag_allow_md = 1;
818 if (prsactx->mdctx == NULL)
819 return 0;
820
821 /*
822 * TODO(3.0): There is the possibility that some externally provided
823 * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
824 * but that problem is much larger than just in RSA.
825 */
826 if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
827 return 0;
828
829 return rsa_verify(vprsactx, sig, siglen, digest, (size_t)dlen);
830 }
831
832 static void rsa_freectx(void *vprsactx)
833 {
834 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
835
836 if (prsactx == NULL)
837 return;
838
839 EVP_MD_CTX_free(prsactx->mdctx);
840 EVP_MD_free(prsactx->md);
841 EVP_MD_free(prsactx->mgf1_md);
842 OPENSSL_free(prsactx->propq);
843 free_tbuf(prsactx);
844 RSA_free(prsactx->rsa);
845
846 OPENSSL_clear_free(prsactx, sizeof(*prsactx));
847 }
848
849 static void *rsa_dupctx(void *vprsactx)
850 {
851 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
852 PROV_RSA_CTX *dstctx;
853
854 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
855 if (dstctx == NULL) {
856 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
857 return NULL;
858 }
859
860 *dstctx = *srcctx;
861 dstctx->rsa = NULL;
862 dstctx->md = NULL;
863 dstctx->mdctx = NULL;
864 dstctx->tbuf = NULL;
865
866 if (srcctx->rsa != NULL && !RSA_up_ref(srcctx->rsa))
867 goto err;
868 dstctx->rsa = srcctx->rsa;
869
870 if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
871 goto err;
872 dstctx->md = srcctx->md;
873
874 if (srcctx->mgf1_md != NULL && !EVP_MD_up_ref(srcctx->mgf1_md))
875 goto err;
876 dstctx->mgf1_md = srcctx->mgf1_md;
877
878 if (srcctx->mdctx != NULL) {
879 dstctx->mdctx = EVP_MD_CTX_new();
880 if (dstctx->mdctx == NULL
881 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
882 goto err;
883 }
884
885 return dstctx;
886 err:
887 rsa_freectx(dstctx);
888 return NULL;
889 }
890
891 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
892 {
893 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
894 OSSL_PARAM *p;
895
896 if (prsactx == NULL || params == NULL)
897 return 0;
898
899 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
900 if (p != NULL
901 && !OSSL_PARAM_set_octet_string(p, prsactx->aid, prsactx->aid_len))
902 return 0;
903
904 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
905 if (p != NULL)
906 switch (p->data_type) {
907 case OSSL_PARAM_INTEGER:
908 if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
909 return 0;
910 break;
911 case OSSL_PARAM_UTF8_STRING:
912 {
913 int i;
914 const char *word = NULL;
915
916 for (i = 0; padding_item[i].id != 0; i++) {
917 if (prsactx->pad_mode == (int)padding_item[i].id) {
918 word = padding_item[i].ptr;
919 break;
920 }
921 }
922
923 if (word != NULL) {
924 if (!OSSL_PARAM_set_utf8_string(p, word))
925 return 0;
926 } else {
927 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
928 }
929 }
930 break;
931 default:
932 return 0;
933 }
934
935 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
936 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mdname))
937 return 0;
938
939 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
940 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mgf1_mdname))
941 return 0;
942
943 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
944 if (p != NULL) {
945 if (p->data_type == OSSL_PARAM_INTEGER) {
946 if (!OSSL_PARAM_set_int(p, prsactx->saltlen))
947 return 0;
948 } else if (p->data_type == OSSL_PARAM_UTF8_STRING) {
949 const char *value = NULL;
950
951 switch (prsactx->saltlen) {
952 case RSA_PSS_SALTLEN_DIGEST:
953 value = OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST;
954 break;
955 case RSA_PSS_SALTLEN_MAX:
956 value = OSSL_PKEY_RSA_PSS_SALT_LEN_MAX;
957 break;
958 case RSA_PSS_SALTLEN_AUTO:
959 value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO;
960 break;
961 default:
962 {
963 int len = BIO_snprintf(p->data, p->data_size, "%d",
964 prsactx->saltlen);
965
966 if (len <= 0)
967 return 0;
968 p->return_size = len;
969 break;
970 }
971 }
972 if (value != NULL
973 && !OSSL_PARAM_set_utf8_string(p, value))
974 return 0;
975 }
976 }
977
978 return 1;
979 }
980
981 static const OSSL_PARAM known_gettable_ctx_params[] = {
982 OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
983 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
984 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
985 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
986 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
987 OSSL_PARAM_END
988 };
989
990 static const OSSL_PARAM *rsa_gettable_ctx_params(ossl_unused void *provctx)
991 {
992 return known_gettable_ctx_params;
993 }
994
995 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
996 {
997 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
998 const OSSL_PARAM *p;
999
1000 if (prsactx == NULL || params == NULL)
1001 return 0;
1002
1003 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
1004 /* Not allowed during certain operations */
1005 if (p != NULL && !prsactx->flag_allow_md)
1006 return 0;
1007 if (p != NULL) {
1008 char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
1009 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
1010 const OSSL_PARAM *propsp =
1011 OSSL_PARAM_locate_const(params,
1012 OSSL_SIGNATURE_PARAM_PROPERTIES);
1013
1014 if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
1015 return 0;
1016
1017 if (propsp == NULL)
1018 pmdprops = NULL;
1019 else if (!OSSL_PARAM_get_utf8_string(propsp,
1020 &pmdprops, sizeof(mdprops)))
1021 return 0;
1022
1023 if (rsa_pss_restricted(prsactx)) {
1024 /* TODO(3.0) figure out what to do for prsactx->md == NULL */
1025 if (prsactx->md == NULL || EVP_MD_is_a(prsactx->md, mdname))
1026 return 1;
1027 ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
1028 return 0;
1029 }
1030
1031 /* non-PSS code follows */
1032 if (!rsa_setup_md(prsactx, mdname, pmdprops))
1033 return 0;
1034 }
1035
1036 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
1037 if (p != NULL) {
1038 int pad_mode = 0;
1039 const char *err_extra_text = NULL;
1040
1041 switch (p->data_type) {
1042 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1043 if (!OSSL_PARAM_get_int(p, &pad_mode))
1044 return 0;
1045 break;
1046 case OSSL_PARAM_UTF8_STRING:
1047 {
1048 int i;
1049
1050 if (p->data == NULL)
1051 return 0;
1052
1053 for (i = 0; padding_item[i].id != 0; i++) {
1054 if (strcmp(p->data, padding_item[i].ptr) == 0) {
1055 pad_mode = padding_item[i].id;
1056 break;
1057 }
1058 }
1059 }
1060 break;
1061 default:
1062 return 0;
1063 }
1064
1065 switch (pad_mode) {
1066 case RSA_PKCS1_OAEP_PADDING:
1067 /*
1068 * OAEP padding is for asymmetric cipher only so is not compatible
1069 * with signature use.
1070 */
1071 err_extra_text = "OAEP padding not allowed for signing / verifying";
1072 goto bad_pad;
1073 case RSA_PKCS1_PSS_PADDING:
1074 if ((prsactx->operation
1075 & (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)) == 0) {
1076 err_extra_text =
1077 "PSS padding only allowed for sign and verify operations";
1078 goto bad_pad;
1079 }
1080 if (prsactx->md == NULL
1081 && !rsa_setup_md(prsactx, OSSL_DIGEST_NAME_SHA1, NULL)) {
1082 return 0;
1083 }
1084 break;
1085 case RSA_PKCS1_PADDING:
1086 err_extra_text = "PKCS#1 padding not allowed with RSA-PSS";
1087 goto cont;
1088 case RSA_SSLV23_PADDING:
1089 err_extra_text = "SSLv3 padding not allowed with RSA-PSS";
1090 goto cont;
1091 case RSA_NO_PADDING:
1092 err_extra_text = "No padding not allowed with RSA-PSS";
1093 goto cont;
1094 case RSA_X931_PADDING:
1095 err_extra_text = "X.931 padding not allowed with RSA-PSS";
1096 cont:
1097 if (RSA_test_flags(prsactx->rsa,
1098 RSA_FLAG_TYPE_MASK) == RSA_FLAG_TYPE_RSA)
1099 break;
1100 /* FALLTHRU */
1101 default:
1102 bad_pad:
1103 if (err_extra_text == NULL)
1104 ERR_raise(ERR_LIB_PROV,
1105 PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
1106 else
1107 ERR_raise_data(ERR_LIB_PROV,
1108 PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
1109 err_extra_text);
1110 return 0;
1111 }
1112 if (!rsa_check_padding(prsactx->mdnid, pad_mode))
1113 return 0;
1114 prsactx->pad_mode = pad_mode;
1115 }
1116
1117 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
1118 if (p != NULL) {
1119 int saltlen;
1120
1121 if (prsactx->pad_mode != RSA_PKCS1_PSS_PADDING) {
1122 ERR_raise_data(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED,
1123 "PSS saltlen can only be specified if "
1124 "PSS padding has been specified first");
1125 return 0;
1126 }
1127
1128 switch (p->data_type) {
1129 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1130 if (!OSSL_PARAM_get_int(p, &saltlen))
1131 return 0;
1132 break;
1133 case OSSL_PARAM_UTF8_STRING:
1134 if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST) == 0)
1135 saltlen = RSA_PSS_SALTLEN_DIGEST;
1136 else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_MAX) == 0)
1137 saltlen = RSA_PSS_SALTLEN_MAX;
1138 else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO) == 0)
1139 saltlen = RSA_PSS_SALTLEN_AUTO;
1140 else
1141 saltlen = atoi(p->data);
1142 break;
1143 default:
1144 return 0;
1145 }
1146
1147 /*
1148 * RSA_PSS_SALTLEN_MAX seems curiously named in this check.
1149 * Contrary to what it's name suggests, it's the currently
1150 * lowest saltlen number possible.
1151 */
1152 if (saltlen < RSA_PSS_SALTLEN_MAX) {
1153 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PSS_SALTLEN);
1154 return 0;
1155 }
1156
1157 if (rsa_pss_restricted(prsactx)) {
1158 switch (saltlen) {
1159 case RSA_PSS_SALTLEN_AUTO:
1160 if (prsactx->operation == EVP_PKEY_OP_VERIFY) {
1161 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PSS_SALTLEN);
1162 return 0;
1163 }
1164 break;
1165 case RSA_PSS_SALTLEN_DIGEST:
1166 if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
1167 ERR_raise_data(ERR_LIB_PROV,
1168 PROV_R_PSS_SALTLEN_TOO_SMALL,
1169 "Should be more than %d, but would be "
1170 "set to match digest size (%d)",
1171 prsactx->min_saltlen,
1172 EVP_MD_size(prsactx->md));
1173 return 0;
1174 }
1175 break;
1176 default:
1177 if (saltlen >= 0 && saltlen < prsactx->min_saltlen) {
1178 ERR_raise_data(ERR_LIB_PROV,
1179 PROV_R_PSS_SALTLEN_TOO_SMALL,
1180 "Should be more than %d, "
1181 "but would be set to %d",
1182 prsactx->min_saltlen, saltlen);
1183 return 0;
1184 }
1185 }
1186 }
1187
1188 prsactx->saltlen = saltlen;
1189 }
1190
1191 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
1192 if (p != NULL) {
1193 char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
1194 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
1195 const OSSL_PARAM *propsp =
1196 OSSL_PARAM_locate_const(params,
1197 OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES);
1198
1199 if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
1200 return 0;
1201
1202 if (propsp == NULL)
1203 pmdprops = NULL;
1204 else if (!OSSL_PARAM_get_utf8_string(propsp,
1205 &pmdprops, sizeof(mdprops)))
1206 return 0;
1207
1208 if (prsactx->pad_mode != RSA_PKCS1_PSS_PADDING) {
1209 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MGF1_MD);
1210 return 0;
1211 }
1212
1213 if (rsa_pss_restricted(prsactx)) {
1214 /* TODO(3.0) figure out what to do for prsactx->mgf1_md == NULL */
1215 if (prsactx->mgf1_md == NULL
1216 || EVP_MD_is_a(prsactx->mgf1_md, mdname))
1217 return 1;
1218 ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
1219 return 0;
1220 }
1221
1222 /* non-PSS code follows */
1223 if (!rsa_setup_mgf1_md(prsactx, mdname, pmdprops))
1224 return 0;
1225 }
1226
1227 return 1;
1228 }
1229
1230 static const OSSL_PARAM known_settable_ctx_params[] = {
1231 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1232 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1233 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
1234 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1235 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
1236 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1237 OSSL_PARAM_END
1238 };
1239
1240 static const OSSL_PARAM *rsa_settable_ctx_params(ossl_unused void *provctx)
1241 {
1242 /*
1243 * TODO(3.0): Should this function return a different set of settable ctx
1244 * params if the ctx is being used for a DigestSign/DigestVerify? In that
1245 * case it is not allowed to set the digest size/digest name because the
1246 * digest is explicitly set as part of the init.
1247 */
1248 return known_settable_ctx_params;
1249 }
1250
1251 static int rsa_get_ctx_md_params(void *vprsactx, OSSL_PARAM *params)
1252 {
1253 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1254
1255 if (prsactx->mdctx == NULL)
1256 return 0;
1257
1258 return EVP_MD_CTX_get_params(prsactx->mdctx, params);
1259 }
1260
1261 static const OSSL_PARAM *rsa_gettable_ctx_md_params(void *vprsactx)
1262 {
1263 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1264
1265 if (prsactx->md == NULL)
1266 return 0;
1267
1268 return EVP_MD_gettable_ctx_params(prsactx->md);
1269 }
1270
1271 static int rsa_set_ctx_md_params(void *vprsactx, const OSSL_PARAM params[])
1272 {
1273 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1274
1275 if (prsactx->mdctx == NULL)
1276 return 0;
1277
1278 return EVP_MD_CTX_set_params(prsactx->mdctx, params);
1279 }
1280
1281 static const OSSL_PARAM *rsa_settable_ctx_md_params(void *vprsactx)
1282 {
1283 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1284
1285 if (prsactx->md == NULL)
1286 return 0;
1287
1288 return EVP_MD_settable_ctx_params(prsactx->md);
1289 }
1290
1291 const OSSL_DISPATCH rsa_signature_functions[] = {
1292 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))rsa_newctx },
1293 { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))rsa_sign_init },
1294 { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))rsa_sign },
1295 { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))rsa_verify_init },
1296 { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))rsa_verify },
1297 { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT,
1298 (void (*)(void))rsa_verify_recover_init },
1299 { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER,
1300 (void (*)(void))rsa_verify_recover },
1301 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
1302 (void (*)(void))rsa_digest_sign_init },
1303 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
1304 (void (*)(void))rsa_digest_signverify_update },
1305 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
1306 (void (*)(void))rsa_digest_sign_final },
1307 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
1308 (void (*)(void))rsa_digest_verify_init },
1309 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
1310 (void (*)(void))rsa_digest_signverify_update },
1311 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
1312 (void (*)(void))rsa_digest_verify_final },
1313 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))rsa_freectx },
1314 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))rsa_dupctx },
1315 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))rsa_get_ctx_params },
1316 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
1317 (void (*)(void))rsa_gettable_ctx_params },
1318 { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))rsa_set_ctx_params },
1319 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
1320 (void (*)(void))rsa_settable_ctx_params },
1321 { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
1322 (void (*)(void))rsa_get_ctx_md_params },
1323 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
1324 (void (*)(void))rsa_gettable_ctx_md_params },
1325 { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
1326 (void (*)(void))rsa_set_ctx_md_params },
1327 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
1328 (void (*)(void))rsa_settable_ctx_md_params },
1329 { 0, NULL }
1330 };
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