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[thirdparty/openssl.git] / providers / implementations / signature / rsa.c
1 /*
2 * Copyright 2019-2021 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 "e_os.h" /* strcasecmp */
17 #include <string.h>
18 #include <openssl/crypto.h>
19 #include <openssl/core_dispatch.h>
20 #include <openssl/core_names.h>
21 #include <openssl/err.h>
22 #include <openssl/rsa.h>
23 #include <openssl/params.h>
24 #include <openssl/evp.h>
25 #include <openssl/proverr.h>
26 #include "internal/cryptlib.h"
27 #include "internal/nelem.h"
28 #include "internal/sizes.h"
29 #include "crypto/rsa.h"
30 #include "prov/providercommon.h"
31 #include "prov/implementations.h"
32 #include "prov/provider_ctx.h"
33 #include "prov/der_rsa.h"
34 #include "prov/securitycheck.h"
35
36 #define RSA_DEFAULT_DIGEST_NAME OSSL_DIGEST_NAME_SHA1
37
38 static OSSL_FUNC_signature_newctx_fn rsa_newctx;
39 static OSSL_FUNC_signature_sign_init_fn rsa_sign_init;
40 static OSSL_FUNC_signature_verify_init_fn rsa_verify_init;
41 static OSSL_FUNC_signature_verify_recover_init_fn rsa_verify_recover_init;
42 static OSSL_FUNC_signature_sign_fn rsa_sign;
43 static OSSL_FUNC_signature_verify_fn rsa_verify;
44 static OSSL_FUNC_signature_verify_recover_fn rsa_verify_recover;
45 static OSSL_FUNC_signature_digest_sign_init_fn rsa_digest_sign_init;
46 static OSSL_FUNC_signature_digest_sign_update_fn rsa_digest_signverify_update;
47 static OSSL_FUNC_signature_digest_sign_final_fn rsa_digest_sign_final;
48 static OSSL_FUNC_signature_digest_verify_init_fn rsa_digest_verify_init;
49 static OSSL_FUNC_signature_digest_verify_update_fn rsa_digest_signverify_update;
50 static OSSL_FUNC_signature_digest_verify_final_fn rsa_digest_verify_final;
51 static OSSL_FUNC_signature_freectx_fn rsa_freectx;
52 static OSSL_FUNC_signature_dupctx_fn rsa_dupctx;
53 static OSSL_FUNC_signature_get_ctx_params_fn rsa_get_ctx_params;
54 static OSSL_FUNC_signature_gettable_ctx_params_fn rsa_gettable_ctx_params;
55 static OSSL_FUNC_signature_set_ctx_params_fn rsa_set_ctx_params;
56 static OSSL_FUNC_signature_settable_ctx_params_fn rsa_settable_ctx_params;
57 static OSSL_FUNC_signature_get_ctx_md_params_fn rsa_get_ctx_md_params;
58 static OSSL_FUNC_signature_gettable_ctx_md_params_fn rsa_gettable_ctx_md_params;
59 static OSSL_FUNC_signature_set_ctx_md_params_fn rsa_set_ctx_md_params;
60 static OSSL_FUNC_signature_settable_ctx_md_params_fn rsa_settable_ctx_md_params;
61
62 static OSSL_ITEM padding_item[] = {
63 { RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
64 { RSA_SSLV23_PADDING, OSSL_PKEY_RSA_PAD_MODE_SSLV23 },
65 { RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
66 { RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
67 { RSA_PKCS1_PSS_PADDING, OSSL_PKEY_RSA_PAD_MODE_PSS },
68 { 0, NULL }
69 };
70
71 /*
72 * What's passed as an actual key is defined by the KEYMGMT interface.
73 * We happen to know that our KEYMGMT simply passes RSA structures, so
74 * we use that here too.
75 */
76
77 typedef struct {
78 OSSL_LIB_CTX *libctx;
79 char *propq;
80 RSA *rsa;
81 int operation;
82
83 /*
84 * Flag to determine if the hash function can be changed (1) or not (0)
85 * Because it's dangerous to change during a DigestSign or DigestVerify
86 * operation, this flag is cleared by their Init function, and set again
87 * by their Final function.
88 */
89 unsigned int flag_allow_md : 1;
90 unsigned int mgf1_md_set : 1;
91
92 /* main digest */
93 EVP_MD *md;
94 EVP_MD_CTX *mdctx;
95 int mdnid;
96 char mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
97
98 /* RSA padding mode */
99 int pad_mode;
100 /* message digest for MGF1 */
101 EVP_MD *mgf1_md;
102 int mgf1_mdnid;
103 char mgf1_mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
104 /* PSS salt length */
105 int saltlen;
106 /* Minimum salt length or -1 if no PSS parameter restriction */
107 int min_saltlen;
108
109 /* Temp buffer */
110 unsigned char *tbuf;
111
112 } PROV_RSA_CTX;
113
114 /* True if PSS parameters are restricted */
115 #define rsa_pss_restricted(prsactx) (prsactx->min_saltlen != -1)
116
117 static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
118 {
119 if (prsactx->md != NULL)
120 return EVP_MD_size(prsactx->md);
121 return 0;
122 }
123
124 static int rsa_check_padding(const PROV_RSA_CTX *prsactx,
125 const char *mdname, const char *mgf1_mdname,
126 int mdnid)
127 {
128 switch(prsactx->pad_mode) {
129 case RSA_NO_PADDING:
130 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE);
131 return 0;
132 case RSA_X931_PADDING:
133 if (RSA_X931_hash_id(mdnid) == -1) {
134 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_X931_DIGEST);
135 return 0;
136 }
137 break;
138 case RSA_PKCS1_PSS_PADDING:
139 if (rsa_pss_restricted(prsactx))
140 if ((mdname != NULL && !EVP_MD_is_a(prsactx->md, mdname))
141 || (mgf1_mdname != NULL
142 && !EVP_MD_is_a(prsactx->mgf1_md, mgf1_mdname))) {
143 ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
144 return 0;
145 }
146 break;
147 default:
148 break;
149 }
150
151 return 1;
152 }
153
154 static int rsa_check_parameters(PROV_RSA_CTX *prsactx, int min_saltlen)
155 {
156 if (prsactx->pad_mode == RSA_PKCS1_PSS_PADDING) {
157 int max_saltlen;
158
159 /* See if minimum salt length exceeds maximum possible */
160 max_saltlen = RSA_size(prsactx->rsa) - EVP_MD_size(prsactx->md);
161 if ((RSA_bits(prsactx->rsa) & 0x7) == 1)
162 max_saltlen--;
163 if (min_saltlen < 0 || min_saltlen > max_saltlen) {
164 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
165 return 0;
166 }
167 prsactx->min_saltlen = min_saltlen;
168 }
169 return 1;
170 }
171
172 static void *rsa_newctx(void *provctx, const char *propq)
173 {
174 PROV_RSA_CTX *prsactx = NULL;
175 char *propq_copy = NULL;
176
177 if (!ossl_prov_is_running())
178 return NULL;
179
180 if ((prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX))) == NULL
181 || (propq != NULL
182 && (propq_copy = OPENSSL_strdup(propq)) == NULL)) {
183 OPENSSL_free(prsactx);
184 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
185 return NULL;
186 }
187
188 prsactx->libctx = PROV_LIBCTX_OF(provctx);
189 prsactx->flag_allow_md = 1;
190 prsactx->propq = propq_copy;
191 return prsactx;
192 }
193
194 static int rsa_pss_compute_saltlen(PROV_RSA_CTX *ctx)
195 {
196 int saltlen = ctx->saltlen;
197
198 if (saltlen == RSA_PSS_SALTLEN_DIGEST) {
199 saltlen = EVP_MD_size(ctx->md);
200 } else if (saltlen == RSA_PSS_SALTLEN_AUTO || saltlen == RSA_PSS_SALTLEN_MAX) {
201 saltlen = RSA_size(ctx->rsa) - EVP_MD_size(ctx->md) - 2;
202 if ((RSA_bits(ctx->rsa) & 0x7) == 1)
203 saltlen--;
204 }
205 if (saltlen < 0) {
206 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
207 return -1;
208 } else if (saltlen < ctx->min_saltlen) {
209 ERR_raise_data(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL,
210 "minimum salt length: %d, actual salt length: %d",
211 ctx->min_saltlen, saltlen);
212 return -1;
213 }
214 return saltlen;
215 }
216
217 static unsigned char *rsa_generate_signature_aid(PROV_RSA_CTX *ctx,
218 unsigned char *aid_buf,
219 size_t buf_len,
220 size_t *aid_len)
221 {
222 WPACKET pkt;
223 unsigned char *aid = NULL;
224 int saltlen;
225 RSA_PSS_PARAMS_30 pss_params;
226
227 if (!WPACKET_init_der(&pkt, aid_buf, buf_len)) {
228 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
229 return NULL;
230 }
231
232 switch(ctx->pad_mode) {
233 case RSA_PKCS1_PADDING:
234 if (!ossl_DER_w_algorithmIdentifier_MDWithRSAEncryption(&pkt, -1,
235 ctx->mdnid)) {
236 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
237 goto cleanup;
238 }
239 break;
240 case RSA_PKCS1_PSS_PADDING:
241 saltlen = rsa_pss_compute_saltlen(ctx);
242 if (saltlen < 0)
243 goto cleanup;
244 if (!ossl_rsa_pss_params_30_set_defaults(&pss_params)
245 || !ossl_rsa_pss_params_30_set_hashalg(&pss_params, ctx->mdnid)
246 || !ossl_rsa_pss_params_30_set_maskgenhashalg(&pss_params,
247 ctx->mgf1_mdnid)
248 || !ossl_rsa_pss_params_30_set_saltlen(&pss_params, saltlen)
249 || !ossl_DER_w_algorithmIdentifier_RSA_PSS(&pkt, -1,
250 RSA_FLAG_TYPE_RSASSAPSS,
251 &pss_params)) {
252 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
253 goto cleanup;
254 }
255 break;
256 default:
257 ERR_raise_data(ERR_LIB_PROV, ERR_R_UNSUPPORTED,
258 "Algorithm ID generation");
259 goto cleanup;
260 }
261 if (WPACKET_finish(&pkt)) {
262 WPACKET_get_total_written(&pkt, aid_len);
263 aid = WPACKET_get_curr(&pkt);
264 }
265 cleanup:
266 WPACKET_cleanup(&pkt);
267 return aid;
268 }
269
270 static int rsa_setup_md(PROV_RSA_CTX *ctx, const char *mdname,
271 const char *mdprops)
272 {
273 if (mdprops == NULL)
274 mdprops = ctx->propq;
275
276 if (mdname != NULL) {
277 EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
278 int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
279 int md_nid = ossl_digest_rsa_sign_get_md_nid(md, sha1_allowed);
280 size_t mdname_len = strlen(mdname);
281
282 if (md == NULL
283 || md_nid == NID_undef
284 || !rsa_check_padding(ctx, mdname, NULL, md_nid)
285 || mdname_len >= sizeof(ctx->mdname)) {
286 if (md == NULL)
287 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
288 "%s could not be fetched", mdname);
289 if (md_nid == NID_undef)
290 ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
291 "digest=%s", mdname);
292 if (mdname_len >= sizeof(ctx->mdname))
293 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
294 "%s exceeds name buffer length", mdname);
295 EVP_MD_free(md);
296 return 0;
297 }
298
299 if (!ctx->mgf1_md_set) {
300 if (!EVP_MD_up_ref(md)) {
301 EVP_MD_free(md);
302 return 0;
303 }
304 EVP_MD_free(ctx->mgf1_md);
305 ctx->mgf1_md = md;
306 ctx->mgf1_mdnid = md_nid;
307 OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
308 }
309
310 EVP_MD_CTX_free(ctx->mdctx);
311 EVP_MD_free(ctx->md);
312
313 ctx->mdctx = NULL;
314 ctx->md = md;
315 ctx->mdnid = md_nid;
316 OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
317 }
318
319 return 1;
320 }
321
322 static int rsa_setup_mgf1_md(PROV_RSA_CTX *ctx, const char *mdname,
323 const char *mdprops)
324 {
325 size_t len;
326 EVP_MD *md = NULL;
327 int mdnid;
328
329 if (mdprops == NULL)
330 mdprops = ctx->propq;
331
332 if ((md = EVP_MD_fetch(ctx->libctx, mdname, mdprops)) == NULL) {
333 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
334 "%s could not be fetched", mdname);
335 return 0;
336 }
337 /* The default for mgf1 is SHA1 - so allow SHA1 */
338 if ((mdnid = ossl_digest_rsa_sign_get_md_nid(md, 1)) == NID_undef
339 || !rsa_check_padding(ctx, NULL, mdname, mdnid)) {
340 if (mdnid == NID_undef)
341 ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
342 "digest=%s", mdname);
343 EVP_MD_free(md);
344 return 0;
345 }
346 len = OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
347 if (len >= sizeof(ctx->mgf1_mdname)) {
348 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
349 "%s exceeds name buffer length", mdname);
350 EVP_MD_free(md);
351 return 0;
352 }
353
354 EVP_MD_free(ctx->mgf1_md);
355 ctx->mgf1_md = md;
356 ctx->mgf1_mdnid = mdnid;
357 ctx->mgf1_md_set = 1;
358 return 1;
359 }
360
361 static int rsa_signverify_init(void *vprsactx, void *vrsa, int operation)
362 {
363 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
364
365 if (!ossl_prov_is_running())
366 return 0;
367
368 if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
369 return 0;
370
371 RSA_free(prsactx->rsa);
372 prsactx->rsa = vrsa;
373 prsactx->operation = operation;
374
375 if (!ossl_rsa_check_key(vrsa, operation == EVP_PKEY_OP_SIGN)) {
376 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
377 return 0;
378 }
379
380 /* Maximum for sign, auto for verify */
381 prsactx->saltlen = RSA_PSS_SALTLEN_AUTO;
382 prsactx->min_saltlen = -1;
383
384 switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
385 case RSA_FLAG_TYPE_RSA:
386 prsactx->pad_mode = RSA_PKCS1_PADDING;
387 break;
388 case RSA_FLAG_TYPE_RSASSAPSS:
389 prsactx->pad_mode = RSA_PKCS1_PSS_PADDING;
390
391 {
392 const RSA_PSS_PARAMS_30 *pss =
393 ossl_rsa_get0_pss_params_30(prsactx->rsa);
394
395 if (!ossl_rsa_pss_params_30_is_unrestricted(pss)) {
396 int md_nid = ossl_rsa_pss_params_30_hashalg(pss);
397 int mgf1md_nid = ossl_rsa_pss_params_30_maskgenhashalg(pss);
398 int min_saltlen = ossl_rsa_pss_params_30_saltlen(pss);
399 const char *mdname, *mgf1mdname;
400 size_t len;
401
402 mdname = ossl_rsa_oaeppss_nid2name(md_nid);
403 mgf1mdname = ossl_rsa_oaeppss_nid2name(mgf1md_nid);
404
405 if (mdname == NULL) {
406 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
407 "PSS restrictions lack hash algorithm");
408 return 0;
409 }
410 if (mgf1mdname == NULL) {
411 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
412 "PSS restrictions lack MGF1 hash algorithm");
413 return 0;
414 }
415
416 len = OPENSSL_strlcpy(prsactx->mdname, mdname,
417 sizeof(prsactx->mdname));
418 if (len >= sizeof(prsactx->mdname)) {
419 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
420 "hash algorithm name too long");
421 return 0;
422 }
423 len = OPENSSL_strlcpy(prsactx->mgf1_mdname, mgf1mdname,
424 sizeof(prsactx->mgf1_mdname));
425 if (len >= sizeof(prsactx->mgf1_mdname)) {
426 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
427 "MGF1 hash algorithm name too long");
428 return 0;
429 }
430 prsactx->saltlen = min_saltlen;
431
432 /* call rsa_setup_mgf1_md before rsa_setup_md to avoid duplication */
433 return rsa_setup_mgf1_md(prsactx, mgf1mdname, prsactx->propq)
434 && rsa_setup_md(prsactx, mdname, prsactx->propq)
435 && rsa_check_parameters(prsactx, min_saltlen);
436 }
437 }
438
439 break;
440 default:
441 ERR_raise(ERR_LIB_RSA, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
442 return 0;
443 }
444
445 return 1;
446 }
447
448 static int setup_tbuf(PROV_RSA_CTX *ctx)
449 {
450 if (ctx->tbuf != NULL)
451 return 1;
452 if ((ctx->tbuf = OPENSSL_malloc(RSA_size(ctx->rsa))) == NULL) {
453 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
454 return 0;
455 }
456 return 1;
457 }
458
459 static void clean_tbuf(PROV_RSA_CTX *ctx)
460 {
461 if (ctx->tbuf != NULL)
462 OPENSSL_cleanse(ctx->tbuf, RSA_size(ctx->rsa));
463 }
464
465 static void free_tbuf(PROV_RSA_CTX *ctx)
466 {
467 clean_tbuf(ctx);
468 OPENSSL_free(ctx->tbuf);
469 ctx->tbuf = NULL;
470 }
471
472 static int rsa_sign_init(void *vprsactx, void *vrsa)
473 {
474 if (!ossl_prov_is_running())
475 return 0;
476 return rsa_signverify_init(vprsactx, vrsa, EVP_PKEY_OP_SIGN);
477 }
478
479 static int rsa_sign(void *vprsactx, unsigned char *sig, size_t *siglen,
480 size_t sigsize, const unsigned char *tbs, size_t tbslen)
481 {
482 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
483 int ret;
484 size_t rsasize = RSA_size(prsactx->rsa);
485 size_t mdsize = rsa_get_md_size(prsactx);
486
487 if (!ossl_prov_is_running())
488 return 0;
489
490 if (sig == NULL) {
491 *siglen = rsasize;
492 return 1;
493 }
494
495 if (sigsize < rsasize) {
496 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SIGNATURE_SIZE,
497 "is %zu, should be at least %zu", sigsize, rsasize);
498 return 0;
499 }
500
501 if (mdsize != 0) {
502 if (tbslen != mdsize) {
503 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH);
504 return 0;
505 }
506
507 #ifndef FIPS_MODULE
508 if (EVP_MD_is_a(prsactx->md, OSSL_DIGEST_NAME_MDC2)) {
509 unsigned int sltmp;
510
511 if (prsactx->pad_mode != RSA_PKCS1_PADDING) {
512 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
513 "only PKCS#1 padding supported with MDC2");
514 return 0;
515 }
516 ret = RSA_sign_ASN1_OCTET_STRING(0, tbs, tbslen, sig, &sltmp,
517 prsactx->rsa);
518
519 if (ret <= 0) {
520 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
521 return 0;
522 }
523 ret = sltmp;
524 goto end;
525 }
526 #endif
527 switch (prsactx->pad_mode) {
528 case RSA_X931_PADDING:
529 if ((size_t)RSA_size(prsactx->rsa) < tbslen + 1) {
530 ERR_raise_data(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL,
531 "RSA key size = %d, expected minimum = %d",
532 RSA_size(prsactx->rsa), tbslen + 1);
533 return 0;
534 }
535 if (!setup_tbuf(prsactx)) {
536 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
537 return 0;
538 }
539 memcpy(prsactx->tbuf, tbs, tbslen);
540 prsactx->tbuf[tbslen] = RSA_X931_hash_id(prsactx->mdnid);
541 ret = RSA_private_encrypt(tbslen + 1, prsactx->tbuf,
542 sig, prsactx->rsa, RSA_X931_PADDING);
543 clean_tbuf(prsactx);
544 break;
545
546 case RSA_PKCS1_PADDING:
547 {
548 unsigned int sltmp;
549
550 ret = RSA_sign(prsactx->mdnid, tbs, tbslen, sig, &sltmp,
551 prsactx->rsa);
552 if (ret <= 0) {
553 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
554 return 0;
555 }
556 ret = sltmp;
557 }
558 break;
559
560 case RSA_PKCS1_PSS_PADDING:
561 /* Check PSS restrictions */
562 if (rsa_pss_restricted(prsactx)) {
563 switch (prsactx->saltlen) {
564 case RSA_PSS_SALTLEN_DIGEST:
565 if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
566 ERR_raise_data(ERR_LIB_PROV,
567 PROV_R_PSS_SALTLEN_TOO_SMALL,
568 "minimum salt length set to %d, "
569 "but the digest only gives %d",
570 prsactx->min_saltlen,
571 EVP_MD_size(prsactx->md));
572 return 0;
573 }
574 /* FALLTHRU */
575 default:
576 if (prsactx->saltlen >= 0
577 && prsactx->saltlen < prsactx->min_saltlen) {
578 ERR_raise_data(ERR_LIB_PROV,
579 PROV_R_PSS_SALTLEN_TOO_SMALL,
580 "minimum salt length set to %d, but the"
581 "actual salt length is only set to %d",
582 prsactx->min_saltlen,
583 prsactx->saltlen);
584 return 0;
585 }
586 break;
587 }
588 }
589 if (!setup_tbuf(prsactx))
590 return 0;
591 if (!RSA_padding_add_PKCS1_PSS_mgf1(prsactx->rsa,
592 prsactx->tbuf, tbs,
593 prsactx->md, prsactx->mgf1_md,
594 prsactx->saltlen)) {
595 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
596 return 0;
597 }
598 ret = RSA_private_encrypt(RSA_size(prsactx->rsa), prsactx->tbuf,
599 sig, prsactx->rsa, RSA_NO_PADDING);
600 clean_tbuf(prsactx);
601 break;
602
603 default:
604 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
605 "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
606 return 0;
607 }
608 } else {
609 ret = RSA_private_encrypt(tbslen, tbs, sig, prsactx->rsa,
610 prsactx->pad_mode);
611 }
612
613 #ifndef FIPS_MODULE
614 end:
615 #endif
616 if (ret <= 0) {
617 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
618 return 0;
619 }
620
621 *siglen = ret;
622 return 1;
623 }
624
625 static int rsa_verify_recover_init(void *vprsactx, void *vrsa)
626 {
627 if (!ossl_prov_is_running())
628 return 0;
629 return rsa_signverify_init(vprsactx, vrsa, EVP_PKEY_OP_VERIFYRECOVER);
630 }
631
632 static int rsa_verify_recover(void *vprsactx,
633 unsigned char *rout,
634 size_t *routlen,
635 size_t routsize,
636 const unsigned char *sig,
637 size_t siglen)
638 {
639 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
640 int ret;
641
642 if (!ossl_prov_is_running())
643 return 0;
644
645 if (rout == NULL) {
646 *routlen = RSA_size(prsactx->rsa);
647 return 1;
648 }
649
650 if (prsactx->md != NULL) {
651 switch (prsactx->pad_mode) {
652 case RSA_X931_PADDING:
653 if (!setup_tbuf(prsactx))
654 return 0;
655 ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
656 RSA_X931_PADDING);
657 if (ret < 1) {
658 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
659 return 0;
660 }
661 ret--;
662 if (prsactx->tbuf[ret] != RSA_X931_hash_id(prsactx->mdnid)) {
663 ERR_raise(ERR_LIB_PROV, PROV_R_ALGORITHM_MISMATCH);
664 return 0;
665 }
666 if (ret != EVP_MD_size(prsactx->md)) {
667 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
668 "Should be %d, but got %d",
669 EVP_MD_size(prsactx->md), ret);
670 return 0;
671 }
672
673 *routlen = ret;
674 if (rout != prsactx->tbuf) {
675 if (routsize < (size_t)ret) {
676 ERR_raise_data(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL,
677 "buffer size is %d, should be %d",
678 routsize, ret);
679 return 0;
680 }
681 memcpy(rout, prsactx->tbuf, ret);
682 }
683 break;
684
685 case RSA_PKCS1_PADDING:
686 {
687 size_t sltmp;
688
689 ret = int_rsa_verify(prsactx->mdnid, NULL, 0, rout, &sltmp,
690 sig, siglen, prsactx->rsa);
691 if (ret <= 0) {
692 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
693 return 0;
694 }
695 ret = sltmp;
696 }
697 break;
698
699 default:
700 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
701 "Only X.931 or PKCS#1 v1.5 padding allowed");
702 return 0;
703 }
704 } else {
705 ret = RSA_public_decrypt(siglen, sig, rout, prsactx->rsa,
706 prsactx->pad_mode);
707 if (ret < 0) {
708 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
709 return 0;
710 }
711 }
712 *routlen = ret;
713 return 1;
714 }
715
716 static int rsa_verify_init(void *vprsactx, void *vrsa)
717 {
718 if (!ossl_prov_is_running())
719 return 0;
720 return rsa_signverify_init(vprsactx, vrsa, EVP_PKEY_OP_VERIFY);
721 }
722
723 static int rsa_verify(void *vprsactx, const unsigned char *sig, size_t siglen,
724 const unsigned char *tbs, size_t tbslen)
725 {
726 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
727 size_t rslen;
728
729 if (!ossl_prov_is_running())
730 return 0;
731 if (prsactx->md != NULL) {
732 switch (prsactx->pad_mode) {
733 case RSA_PKCS1_PADDING:
734 if (!RSA_verify(prsactx->mdnid, tbs, tbslen, sig, siglen,
735 prsactx->rsa)) {
736 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
737 return 0;
738 }
739 return 1;
740 case RSA_X931_PADDING:
741 if (!setup_tbuf(prsactx))
742 return 0;
743 if (rsa_verify_recover(prsactx, prsactx->tbuf, &rslen, 0,
744 sig, siglen) <= 0)
745 return 0;
746 break;
747 case RSA_PKCS1_PSS_PADDING:
748 {
749 int ret;
750 size_t mdsize;
751
752 /*
753 * We need to check this for the RSA_verify_PKCS1_PSS_mgf1()
754 * call
755 */
756 mdsize = rsa_get_md_size(prsactx);
757 if (tbslen != mdsize) {
758 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
759 "Should be %d, but got %d",
760 mdsize, tbslen);
761 return 0;
762 }
763
764 if (!setup_tbuf(prsactx))
765 return 0;
766 ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf,
767 prsactx->rsa, RSA_NO_PADDING);
768 if (ret <= 0) {
769 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
770 return 0;
771 }
772 ret = RSA_verify_PKCS1_PSS_mgf1(prsactx->rsa, tbs,
773 prsactx->md, prsactx->mgf1_md,
774 prsactx->tbuf,
775 prsactx->saltlen);
776 if (ret <= 0) {
777 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
778 return 0;
779 }
780 return 1;
781 }
782 default:
783 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
784 "Only X.931, PKCS#1 v1.5 or PSS padding allowed");
785 return 0;
786 }
787 } else {
788 if (!setup_tbuf(prsactx))
789 return 0;
790 rslen = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
791 prsactx->pad_mode);
792 if (rslen == 0) {
793 ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
794 return 0;
795 }
796 }
797
798 if ((rslen != tbslen) || memcmp(tbs, prsactx->tbuf, rslen))
799 return 0;
800
801 return 1;
802 }
803
804 static int rsa_digest_signverify_init(void *vprsactx, const char *mdname,
805 void *vrsa, int operation)
806 {
807 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
808
809 if (!ossl_prov_is_running())
810 return 0;
811
812 if (prsactx != NULL)
813 prsactx->flag_allow_md = 0;
814 if (!rsa_signverify_init(vprsactx, vrsa, operation))
815 return 0;
816 if (mdname != NULL
817 /* was rsa_setup_md already called in rsa_signverify_init()? */
818 && (mdname[0] == '\0' || strcasecmp(prsactx->mdname, mdname) != 0)
819 && !rsa_setup_md(prsactx, mdname, prsactx->propq))
820 return 0;
821
822 prsactx->mdctx = EVP_MD_CTX_new();
823 if (prsactx->mdctx == NULL) {
824 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
825 goto error;
826 }
827
828 if (!EVP_DigestInit_ex(prsactx->mdctx, prsactx->md, NULL))
829 goto error;
830
831 return 1;
832
833 error:
834 EVP_MD_CTX_free(prsactx->mdctx);
835 EVP_MD_free(prsactx->md);
836 prsactx->mdctx = NULL;
837 prsactx->md = NULL;
838 return 0;
839 }
840
841 static int rsa_digest_signverify_update(void *vprsactx,
842 const unsigned char *data,
843 size_t datalen)
844 {
845 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
846
847 if (prsactx == NULL || prsactx->mdctx == NULL)
848 return 0;
849
850 return EVP_DigestUpdate(prsactx->mdctx, data, datalen);
851 }
852
853 static int rsa_digest_sign_init(void *vprsactx, const char *mdname,
854 void *vrsa)
855 {
856 if (!ossl_prov_is_running())
857 return 0;
858 return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
859 EVP_PKEY_OP_SIGN);
860 }
861
862 static int rsa_digest_sign_final(void *vprsactx, unsigned char *sig,
863 size_t *siglen, size_t sigsize)
864 {
865 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
866 unsigned char digest[EVP_MAX_MD_SIZE];
867 unsigned int dlen = 0;
868
869 if (!ossl_prov_is_running() || prsactx == NULL)
870 return 0;
871 prsactx->flag_allow_md = 1;
872 if (prsactx->mdctx == NULL)
873 return 0;
874 /*
875 * If sig is NULL then we're just finding out the sig size. Other fields
876 * are ignored. Defer to rsa_sign.
877 */
878 if (sig != NULL) {
879 /*
880 * The digests used here are all known (see rsa_get_md_nid()), so they
881 * should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
882 */
883 if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
884 return 0;
885 }
886
887 return rsa_sign(vprsactx, sig, siglen, sigsize, digest, (size_t)dlen);
888 }
889
890 static int rsa_digest_verify_init(void *vprsactx, const char *mdname,
891 void *vrsa)
892 {
893 if (!ossl_prov_is_running())
894 return 0;
895 return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
896 EVP_PKEY_OP_VERIFY);
897 }
898
899 int rsa_digest_verify_final(void *vprsactx, const unsigned char *sig,
900 size_t siglen)
901 {
902 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
903 unsigned char digest[EVP_MAX_MD_SIZE];
904 unsigned int dlen = 0;
905
906 if (!ossl_prov_is_running())
907 return 0;
908
909 if (prsactx == NULL)
910 return 0;
911 prsactx->flag_allow_md = 1;
912 if (prsactx->mdctx == NULL)
913 return 0;
914
915 /*
916 * The digests used here are all known (see rsa_get_md_nid()), so they
917 * should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
918 */
919 if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
920 return 0;
921
922 return rsa_verify(vprsactx, sig, siglen, digest, (size_t)dlen);
923 }
924
925 static void rsa_freectx(void *vprsactx)
926 {
927 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
928
929 if (prsactx == NULL)
930 return;
931
932 EVP_MD_CTX_free(prsactx->mdctx);
933 EVP_MD_free(prsactx->md);
934 EVP_MD_free(prsactx->mgf1_md);
935 OPENSSL_free(prsactx->propq);
936 free_tbuf(prsactx);
937 RSA_free(prsactx->rsa);
938
939 OPENSSL_clear_free(prsactx, sizeof(*prsactx));
940 }
941
942 static void *rsa_dupctx(void *vprsactx)
943 {
944 PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
945 PROV_RSA_CTX *dstctx;
946
947 if (!ossl_prov_is_running())
948 return NULL;
949
950 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
951 if (dstctx == NULL) {
952 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
953 return NULL;
954 }
955
956 *dstctx = *srcctx;
957 dstctx->rsa = NULL;
958 dstctx->md = NULL;
959 dstctx->mdctx = NULL;
960 dstctx->tbuf = NULL;
961 dstctx->propq = NULL;
962
963 if (srcctx->rsa != NULL && !RSA_up_ref(srcctx->rsa))
964 goto err;
965 dstctx->rsa = srcctx->rsa;
966
967 if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
968 goto err;
969 dstctx->md = srcctx->md;
970
971 if (srcctx->mgf1_md != NULL && !EVP_MD_up_ref(srcctx->mgf1_md))
972 goto err;
973 dstctx->mgf1_md = srcctx->mgf1_md;
974
975 if (srcctx->mdctx != NULL) {
976 dstctx->mdctx = EVP_MD_CTX_new();
977 if (dstctx->mdctx == NULL
978 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
979 goto err;
980 }
981
982 if (srcctx->propq != NULL) {
983 dstctx->propq = OPENSSL_strdup(srcctx->propq);
984 if (dstctx->propq == NULL)
985 goto err;
986 }
987
988 return dstctx;
989 err:
990 rsa_freectx(dstctx);
991 return NULL;
992 }
993
994 static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
995 {
996 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
997 OSSL_PARAM *p;
998
999 if (prsactx == NULL || params == NULL)
1000 return 0;
1001
1002 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
1003 if (p != NULL) {
1004 /* The Algorithm Identifier of the combined signature algorithm */
1005 unsigned char aid_buf[128];
1006 unsigned char *aid;
1007 size_t aid_len;
1008
1009 aid = rsa_generate_signature_aid(prsactx, aid_buf,
1010 sizeof(aid_buf), &aid_len);
1011 if (aid == NULL || !OSSL_PARAM_set_octet_string(p, aid, aid_len))
1012 return 0;
1013 }
1014
1015 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
1016 if (p != NULL)
1017 switch (p->data_type) {
1018 case OSSL_PARAM_INTEGER:
1019 if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
1020 return 0;
1021 break;
1022 case OSSL_PARAM_UTF8_STRING:
1023 {
1024 int i;
1025 const char *word = NULL;
1026
1027 for (i = 0; padding_item[i].id != 0; i++) {
1028 if (prsactx->pad_mode == (int)padding_item[i].id) {
1029 word = padding_item[i].ptr;
1030 break;
1031 }
1032 }
1033
1034 if (word != NULL) {
1035 if (!OSSL_PARAM_set_utf8_string(p, word))
1036 return 0;
1037 } else {
1038 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
1039 }
1040 }
1041 break;
1042 default:
1043 return 0;
1044 }
1045
1046 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
1047 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mdname))
1048 return 0;
1049
1050 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
1051 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mgf1_mdname))
1052 return 0;
1053
1054 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
1055 if (p != NULL) {
1056 if (p->data_type == OSSL_PARAM_INTEGER) {
1057 if (!OSSL_PARAM_set_int(p, prsactx->saltlen))
1058 return 0;
1059 } else if (p->data_type == OSSL_PARAM_UTF8_STRING) {
1060 const char *value = NULL;
1061
1062 switch (prsactx->saltlen) {
1063 case RSA_PSS_SALTLEN_DIGEST:
1064 value = OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST;
1065 break;
1066 case RSA_PSS_SALTLEN_MAX:
1067 value = OSSL_PKEY_RSA_PSS_SALT_LEN_MAX;
1068 break;
1069 case RSA_PSS_SALTLEN_AUTO:
1070 value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO;
1071 break;
1072 default:
1073 {
1074 int len = BIO_snprintf(p->data, p->data_size, "%d",
1075 prsactx->saltlen);
1076
1077 if (len <= 0)
1078 return 0;
1079 p->return_size = len;
1080 break;
1081 }
1082 }
1083 if (value != NULL
1084 && !OSSL_PARAM_set_utf8_string(p, value))
1085 return 0;
1086 }
1087 }
1088
1089 return 1;
1090 }
1091
1092 static const OSSL_PARAM known_gettable_ctx_params[] = {
1093 OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
1094 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1095 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1096 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1097 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1098 OSSL_PARAM_END
1099 };
1100
1101 static const OSSL_PARAM *rsa_gettable_ctx_params(ossl_unused void *vctx)
1102 {
1103 return known_gettable_ctx_params;
1104 }
1105
1106 static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
1107 {
1108 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1109 const OSSL_PARAM *p;
1110 int pad_mode;
1111 int saltlen;
1112 char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = NULL;
1113 char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = NULL;
1114 char mgf1mdname[OSSL_MAX_NAME_SIZE] = "", *pmgf1mdname = NULL;
1115 char mgf1mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmgf1mdprops = NULL;
1116
1117 if (prsactx == NULL || params == NULL)
1118 return 0;
1119 pad_mode = prsactx->pad_mode;
1120 saltlen = prsactx->saltlen;
1121
1122 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
1123 /* Not allowed during certain operations */
1124 if (p != NULL && !prsactx->flag_allow_md)
1125 return 0;
1126 if (p != NULL) {
1127 const OSSL_PARAM *propsp =
1128 OSSL_PARAM_locate_const(params,
1129 OSSL_SIGNATURE_PARAM_PROPERTIES);
1130
1131 pmdname = mdname;
1132 if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
1133 return 0;
1134
1135 if (propsp != NULL) {
1136 pmdprops = mdprops;
1137 if (!OSSL_PARAM_get_utf8_string(propsp,
1138 &pmdprops, sizeof(mdprops)))
1139 return 0;
1140 }
1141 }
1142
1143 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
1144 if (p != NULL) {
1145 const char *err_extra_text = NULL;
1146
1147 switch (p->data_type) {
1148 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1149 if (!OSSL_PARAM_get_int(p, &pad_mode))
1150 return 0;
1151 break;
1152 case OSSL_PARAM_UTF8_STRING:
1153 {
1154 int i;
1155
1156 if (p->data == NULL)
1157 return 0;
1158
1159 for (i = 0; padding_item[i].id != 0; i++) {
1160 if (strcmp(p->data, padding_item[i].ptr) == 0) {
1161 pad_mode = padding_item[i].id;
1162 break;
1163 }
1164 }
1165 }
1166 break;
1167 default:
1168 return 0;
1169 }
1170
1171 switch (pad_mode) {
1172 case RSA_PKCS1_OAEP_PADDING:
1173 /*
1174 * OAEP padding is for asymmetric cipher only so is not compatible
1175 * with signature use.
1176 */
1177 err_extra_text = "OAEP padding not allowed for signing / verifying";
1178 goto bad_pad;
1179 case RSA_PKCS1_PSS_PADDING:
1180 if ((prsactx->operation
1181 & (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)) == 0) {
1182 err_extra_text =
1183 "PSS padding only allowed for sign and verify operations";
1184 goto bad_pad;
1185 }
1186 break;
1187 case RSA_PKCS1_PADDING:
1188 err_extra_text = "PKCS#1 padding not allowed with RSA-PSS";
1189 goto cont;
1190 case RSA_SSLV23_PADDING:
1191 err_extra_text = "SSLv3 padding not allowed with RSA-PSS";
1192 goto cont;
1193 case RSA_NO_PADDING:
1194 err_extra_text = "No padding not allowed with RSA-PSS";
1195 goto cont;
1196 case RSA_X931_PADDING:
1197 err_extra_text = "X.931 padding not allowed with RSA-PSS";
1198 cont:
1199 if (RSA_test_flags(prsactx->rsa,
1200 RSA_FLAG_TYPE_MASK) == RSA_FLAG_TYPE_RSA)
1201 break;
1202 /* FALLTHRU */
1203 default:
1204 bad_pad:
1205 if (err_extra_text == NULL)
1206 ERR_raise(ERR_LIB_PROV,
1207 PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
1208 else
1209 ERR_raise_data(ERR_LIB_PROV,
1210 PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
1211 err_extra_text);
1212 return 0;
1213 }
1214 }
1215
1216 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
1217 if (p != NULL) {
1218 if (pad_mode != RSA_PKCS1_PSS_PADDING) {
1219 ERR_raise_data(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED,
1220 "PSS saltlen can only be specified if "
1221 "PSS padding has been specified first");
1222 return 0;
1223 }
1224
1225 switch (p->data_type) {
1226 case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1227 if (!OSSL_PARAM_get_int(p, &saltlen))
1228 return 0;
1229 break;
1230 case OSSL_PARAM_UTF8_STRING:
1231 if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST) == 0)
1232 saltlen = RSA_PSS_SALTLEN_DIGEST;
1233 else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_MAX) == 0)
1234 saltlen = RSA_PSS_SALTLEN_MAX;
1235 else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO) == 0)
1236 saltlen = RSA_PSS_SALTLEN_AUTO;
1237 else
1238 saltlen = atoi(p->data);
1239 break;
1240 default:
1241 return 0;
1242 }
1243
1244 /*
1245 * RSA_PSS_SALTLEN_MAX seems curiously named in this check.
1246 * Contrary to what it's name suggests, it's the currently
1247 * lowest saltlen number possible.
1248 */
1249 if (saltlen < RSA_PSS_SALTLEN_MAX) {
1250 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
1251 return 0;
1252 }
1253
1254 if (rsa_pss_restricted(prsactx)) {
1255 switch (saltlen) {
1256 case RSA_PSS_SALTLEN_AUTO:
1257 if (prsactx->operation == EVP_PKEY_OP_VERIFY) {
1258 ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH,
1259 "Cannot use autodetected salt length");
1260 return 0;
1261 }
1262 break;
1263 case RSA_PSS_SALTLEN_DIGEST:
1264 if (prsactx->min_saltlen > EVP_MD_size(prsactx->md)) {
1265 ERR_raise_data(ERR_LIB_PROV,
1266 PROV_R_PSS_SALTLEN_TOO_SMALL,
1267 "Should be more than %d, but would be "
1268 "set to match digest size (%d)",
1269 prsactx->min_saltlen,
1270 EVP_MD_size(prsactx->md));
1271 return 0;
1272 }
1273 break;
1274 default:
1275 if (saltlen >= 0 && saltlen < prsactx->min_saltlen) {
1276 ERR_raise_data(ERR_LIB_PROV,
1277 PROV_R_PSS_SALTLEN_TOO_SMALL,
1278 "Should be more than %d, "
1279 "but would be set to %d",
1280 prsactx->min_saltlen, saltlen);
1281 return 0;
1282 }
1283 }
1284 }
1285 }
1286
1287 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
1288 if (p != NULL) {
1289 const OSSL_PARAM *propsp =
1290 OSSL_PARAM_locate_const(params,
1291 OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES);
1292
1293 pmgf1mdname = mgf1mdname;
1294 if (!OSSL_PARAM_get_utf8_string(p, &pmgf1mdname, sizeof(mgf1mdname)))
1295 return 0;
1296
1297 if (propsp != NULL) {
1298 pmgf1mdprops = mgf1mdprops;
1299 if (!OSSL_PARAM_get_utf8_string(propsp,
1300 &pmgf1mdprops, sizeof(mgf1mdprops)))
1301 return 0;
1302 }
1303
1304 if (pad_mode != RSA_PKCS1_PSS_PADDING) {
1305 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MGF1_MD);
1306 return 0;
1307 }
1308 }
1309
1310 prsactx->saltlen = saltlen;
1311 prsactx->pad_mode = pad_mode;
1312
1313 if (prsactx->md == NULL && pmdname == NULL
1314 && pad_mode == RSA_PKCS1_PSS_PADDING)
1315 pmdname = RSA_DEFAULT_DIGEST_NAME;
1316
1317 if (pmgf1mdname != NULL
1318 && !rsa_setup_mgf1_md(prsactx, pmgf1mdname, pmgf1mdprops))
1319 return 0;
1320
1321 if (pmdname != NULL) {
1322 if (!rsa_setup_md(prsactx, pmdname, pmdprops))
1323 return 0;
1324 } else {
1325 if (!rsa_check_padding(prsactx, NULL, NULL, prsactx->mdnid))
1326 return 0;
1327 }
1328 return 1;
1329 }
1330
1331 static const OSSL_PARAM known_settable_ctx_params[] = {
1332 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1333 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1334 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
1335 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1336 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
1337 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1338 OSSL_PARAM_END
1339 };
1340
1341 static const OSSL_PARAM *rsa_settable_ctx_params(ossl_unused void *provctx)
1342 {
1343 /*
1344 * TODO(3.0): Should this function return a different set of settable ctx
1345 * params if the ctx is being used for a DigestSign/DigestVerify? In that
1346 * case it is not allowed to set the digest size/digest name because the
1347 * digest is explicitly set as part of the init.
1348 */
1349 return known_settable_ctx_params;
1350 }
1351
1352 static int rsa_get_ctx_md_params(void *vprsactx, OSSL_PARAM *params)
1353 {
1354 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1355
1356 if (prsactx->mdctx == NULL)
1357 return 0;
1358
1359 return EVP_MD_CTX_get_params(prsactx->mdctx, params);
1360 }
1361
1362 static const OSSL_PARAM *rsa_gettable_ctx_md_params(void *vprsactx)
1363 {
1364 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1365
1366 if (prsactx->md == NULL)
1367 return 0;
1368
1369 return EVP_MD_gettable_ctx_params(prsactx->md);
1370 }
1371
1372 static int rsa_set_ctx_md_params(void *vprsactx, const OSSL_PARAM params[])
1373 {
1374 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1375
1376 if (prsactx->mdctx == NULL)
1377 return 0;
1378
1379 return EVP_MD_CTX_set_params(prsactx->mdctx, params);
1380 }
1381
1382 static const OSSL_PARAM *rsa_settable_ctx_md_params(void *vprsactx)
1383 {
1384 PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
1385
1386 if (prsactx->md == NULL)
1387 return 0;
1388
1389 return EVP_MD_settable_ctx_params(prsactx->md);
1390 }
1391
1392 const OSSL_DISPATCH ossl_rsa_signature_functions[] = {
1393 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))rsa_newctx },
1394 { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))rsa_sign_init },
1395 { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))rsa_sign },
1396 { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))rsa_verify_init },
1397 { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))rsa_verify },
1398 { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT,
1399 (void (*)(void))rsa_verify_recover_init },
1400 { OSSL_FUNC_SIGNATURE_VERIFY_RECOVER,
1401 (void (*)(void))rsa_verify_recover },
1402 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
1403 (void (*)(void))rsa_digest_sign_init },
1404 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
1405 (void (*)(void))rsa_digest_signverify_update },
1406 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
1407 (void (*)(void))rsa_digest_sign_final },
1408 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
1409 (void (*)(void))rsa_digest_verify_init },
1410 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
1411 (void (*)(void))rsa_digest_signverify_update },
1412 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
1413 (void (*)(void))rsa_digest_verify_final },
1414 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))rsa_freectx },
1415 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))rsa_dupctx },
1416 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))rsa_get_ctx_params },
1417 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
1418 (void (*)(void))rsa_gettable_ctx_params },
1419 { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))rsa_set_ctx_params },
1420 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
1421 (void (*)(void))rsa_settable_ctx_params },
1422 { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
1423 (void (*)(void))rsa_get_ctx_md_params },
1424 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
1425 (void (*)(void))rsa_gettable_ctx_md_params },
1426 { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
1427 (void (*)(void))rsa_set_ctx_md_params },
1428 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
1429 (void (*)(void))rsa_settable_ctx_md_params },
1430 { 0, NULL }
1431 };
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