rsa_sig.c@ 105132

最後變更在這個檔案從105132是 104078,由 vboxsync 提交於 12 月前
openssl-3.1.5: Applied and adjusted our OpenSSL changes to 3.1.4. bugref:10638
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1	/*
2	* Copyright 2019-2023 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 <openssl/proverr.h>
25	#include "internal/cryptlib.h"
26	#include "internal/nelem.h"
27	#include "internal/sizes.h"
28	#include "crypto/rsa.h"
29	#include "prov/providercommon.h"
30	#include "prov/implementations.h"
31	#include "prov/provider_ctx.h"
32	#include "prov/der_rsa.h"
33	#include "prov/securitycheck.h"
34
35	#define RSA_DEFAULT_DIGEST_NAME OSSL_DIGEST_NAME_SHA1
36
37	static OSSL_FUNC_signature_newctx_fn rsa_newctx;
38	static OSSL_FUNC_signature_sign_init_fn rsa_sign_init;
39	static OSSL_FUNC_signature_verify_init_fn rsa_verify_init;
40	static OSSL_FUNC_signature_verify_recover_init_fn rsa_verify_recover_init;
41	static OSSL_FUNC_signature_sign_fn rsa_sign;
42	static OSSL_FUNC_signature_verify_fn rsa_verify;
43	static OSSL_FUNC_signature_verify_recover_fn rsa_verify_recover;
44	static OSSL_FUNC_signature_digest_sign_init_fn rsa_digest_sign_init;
45	static OSSL_FUNC_signature_digest_sign_update_fn rsa_digest_signverify_update;
46	static OSSL_FUNC_signature_digest_sign_final_fn rsa_digest_sign_final;
47	static OSSL_FUNC_signature_digest_verify_init_fn rsa_digest_verify_init;
48	static OSSL_FUNC_signature_digest_verify_update_fn rsa_digest_signverify_update;
49	static OSSL_FUNC_signature_digest_verify_final_fn rsa_digest_verify_final;
50	static OSSL_FUNC_signature_freectx_fn rsa_freectx;
51	static OSSL_FUNC_signature_dupctx_fn rsa_dupctx;
52	static OSSL_FUNC_signature_get_ctx_params_fn rsa_get_ctx_params;
53	static OSSL_FUNC_signature_gettable_ctx_params_fn rsa_gettable_ctx_params;
54	static OSSL_FUNC_signature_set_ctx_params_fn rsa_set_ctx_params;
55	static OSSL_FUNC_signature_settable_ctx_params_fn rsa_settable_ctx_params;
56	static OSSL_FUNC_signature_get_ctx_md_params_fn rsa_get_ctx_md_params;
57	static OSSL_FUNC_signature_gettable_ctx_md_params_fn rsa_gettable_ctx_md_params;
58	static OSSL_FUNC_signature_set_ctx_md_params_fn rsa_set_ctx_md_params;
59	static OSSL_FUNC_signature_settable_ctx_md_params_fn rsa_settable_ctx_md_params;
60
61	static OSSL_ITEM padding_item[] = {
62	{ RSA_PKCS1_PADDING, OSSL_PKEY_RSA_PAD_MODE_PKCSV15 },
63	{ RSA_NO_PADDING, OSSL_PKEY_RSA_PAD_MODE_NONE },
64	{ RSA_X931_PADDING, OSSL_PKEY_RSA_PAD_MODE_X931 },
65	{ RSA_PKCS1_PSS_PADDING, OSSL_PKEY_RSA_PAD_MODE_PSS },
66	{ 0, NULL }
67	};
68
69	/*
70	* What's passed as an actual key is defined by the KEYMGMT interface.
71	* We happen to know that our KEYMGMT simply passes RSA structures, so
72	* we use that here too.
73	*/
74
75	typedef struct {
76	OSSL_LIB_CTX *libctx;
77	char *propq;
78	RSA *rsa;
79	int operation;
80
81	/*
82	* Flag to determine if the hash function can be changed (1) or not (0)
83	* Because it's dangerous to change during a DigestSign or DigestVerify
84	* operation, this flag is cleared by their Init function, and set again
85	* by their Final function.
86	*/
87	unsigned int flag_allow_md : 1;
88	unsigned int mgf1_md_set : 1;
89
90	/* main digest */
91	EVP_MD *md;
92	EVP_MD_CTX *mdctx;
93	int mdnid;
94	char mdname[OSSL_MAX_NAME_SIZE]; /* Purely informational */
95
96	/* RSA padding mode */
97	int pad_mode;
98	/* message digest for MGF1 */
99	EVP_MD *mgf1_md;
100	int mgf1_mdnid;
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	/* True if PSS parameters are restricted */
113	#define rsa_pss_restricted(prsactx) (prsactx->min_saltlen != -1)
114
115	static size_t rsa_get_md_size(const PROV_RSA_CTX *prsactx)
116	{
117	if (prsactx->md != NULL)
118	return EVP_MD_get_size(prsactx->md);
119	return 0;
120	}
121
122	static int rsa_check_padding(const PROV_RSA_CTX *prsactx,
123	const char mdname, const char mgf1_mdname,
124	int mdnid)
125	{
126	switch(prsactx->pad_mode) {
127	case RSA_NO_PADDING:
128	if (mdname != NULL \|\| mdnid != NID_undef) {
129	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE);
130	return 0;
131	}
132	break;
133	case RSA_X931_PADDING:
134	if (RSA_X931_hash_id(mdnid) == -1) {
135	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_X931_DIGEST);
136	return 0;
137	}
138	break;
139	case RSA_PKCS1_PSS_PADDING:
140	if (rsa_pss_restricted(prsactx))
141	if ((mdname != NULL && !EVP_MD_is_a(prsactx->md, mdname))
142	\|\| (mgf1_mdname != NULL
143	&& !EVP_MD_is_a(prsactx->mgf1_md, mgf1_mdname))) {
144	ERR_raise(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED);
145	return 0;
146	}
147	break;
148	default:
149	break;
150	}
151
152	return 1;
153	}
154
155	static int rsa_check_parameters(PROV_RSA_CTX *prsactx, int min_saltlen)
156	{
157	if (prsactx->pad_mode == RSA_PKCS1_PSS_PADDING) {
158	int max_saltlen;
159
160	/* See if minimum salt length exceeds maximum possible */
161	max_saltlen = RSA_size(prsactx->rsa) - EVP_MD_get_size(prsactx->md);
162	if ((RSA_bits(prsactx->rsa) & 0x7) == 1)
163	max_saltlen--;
164	if (min_saltlen < 0 \|\| min_saltlen > max_saltlen) {
165	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
166	return 0;
167	}
168	prsactx->min_saltlen = min_saltlen;
169	}
170	return 1;
171	}
172
173	static void rsa_newctx(void provctx, const char *propq)
174	{
175	PROV_RSA_CTX *prsactx = NULL;
176	char *propq_copy = NULL;
177
178	if (!ossl_prov_is_running())
179	return NULL;
180
181	if ((prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX))) == NULL
182	\|\| (propq != NULL
183	&& (propq_copy = OPENSSL_strdup(propq)) == NULL)) {
184	OPENSSL_free(prsactx);
185	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
186	return NULL;
187	}
188
189	prsactx->libctx = PROV_LIBCTX_OF(provctx);
190	prsactx->flag_allow_md = 1;
191	prsactx->propq = propq_copy;
192	/* Maximum up to digest length for sign, auto for verify */
193	prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
194	prsactx->min_saltlen = -1;
195	return prsactx;
196	}
197
198	static int rsa_pss_compute_saltlen(PROV_RSA_CTX *ctx)
199	{
200	int saltlen = ctx->saltlen;
201	int saltlenMax = -1;
202
203	/* FIPS 186-4 section 5 "The RSA Digital Signature Algorithm", subsection
204	* 5.5 "PKCS #1" says: "For RSASSA-PSS […] the length (in bytes) of the
205	* salt (sLen) shall satisfy 0 <= sLen <= hLen, where hLen is the length of
206	* the hash function output block (in bytes)."
207	*
208	* Provide a way to use at most the digest length, so that the default does
209	* not violate FIPS 186-4. */
210	if (saltlen == RSA_PSS_SALTLEN_DIGEST) {
211	saltlen = EVP_MD_get_size(ctx->md);
212	} else if (saltlen == RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) {
213	saltlen = RSA_PSS_SALTLEN_MAX;
214	saltlenMax = EVP_MD_get_size(ctx->md);
215	}
216	if (saltlen == RSA_PSS_SALTLEN_MAX \|\| saltlen == RSA_PSS_SALTLEN_AUTO) {
217	saltlen = RSA_size(ctx->rsa) - EVP_MD_get_size(ctx->md) - 2;
218	if ((RSA_bits(ctx->rsa) & 0x7) == 1)
219	saltlen--;
220	if (saltlenMax >= 0 && saltlen > saltlenMax)
221	saltlen = saltlenMax;
222	}
223	if (saltlen < 0) {
224	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
225	return -1;
226	} else if (saltlen < ctx->min_saltlen) {
227	ERR_raise_data(ERR_LIB_PROV, PROV_R_PSS_SALTLEN_TOO_SMALL,
228	"minimum salt length: %d, actual salt length: %d",
229	ctx->min_saltlen, saltlen);
230	return -1;
231	}
232	return saltlen;
233	}
234
235	static unsigned char rsa_generate_signature_aid(PROV_RSA_CTX ctx,
236	unsigned char *aid_buf,
237	size_t buf_len,
238	size_t *aid_len)
239	{
240	WPACKET pkt;
241	unsigned char *aid = NULL;
242	int saltlen;
243	RSA_PSS_PARAMS_30 pss_params;
244	int ret;
245
246	if (!WPACKET_init_der(&pkt, aid_buf, buf_len)) {
247	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
248	return NULL;
249	}
250
251	switch(ctx->pad_mode) {
252	case RSA_PKCS1_PADDING:
253	ret = ossl_DER_w_algorithmIdentifier_MDWithRSAEncryption(&pkt, -1,
254	ctx->mdnid);
255
256	if (ret > 0) {
257	break;
258	} else if (ret == 0) {
259	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
260	goto cleanup;
261	}
262	ERR_raise_data(ERR_LIB_PROV, ERR_R_UNSUPPORTED,
263	"Algorithm ID generation - md NID: %d",
264	ctx->mdnid);
265	goto cleanup;
266	case RSA_PKCS1_PSS_PADDING:
267	saltlen = rsa_pss_compute_saltlen(ctx);
268	if (saltlen < 0)
269	goto cleanup;
270	if (!ossl_rsa_pss_params_30_set_defaults(&pss_params)
271	\|\| !ossl_rsa_pss_params_30_set_hashalg(&pss_params, ctx->mdnid)
272	\|\| !ossl_rsa_pss_params_30_set_maskgenhashalg(&pss_params,
273	ctx->mgf1_mdnid)
274	\|\| !ossl_rsa_pss_params_30_set_saltlen(&pss_params, saltlen)
275	\|\| !ossl_DER_w_algorithmIdentifier_RSA_PSS(&pkt, -1,
276	RSA_FLAG_TYPE_RSASSAPSS,
277	&pss_params)) {
278	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
279	goto cleanup;
280	}
281	break;
282	default:
283	ERR_raise_data(ERR_LIB_PROV, ERR_R_UNSUPPORTED,
284	"Algorithm ID generation - pad mode: %d",
285	ctx->pad_mode);
286	goto cleanup;
287	}
288	if (WPACKET_finish(&pkt)) {
289	WPACKET_get_total_written(&pkt, aid_len);
290	aid = WPACKET_get_curr(&pkt);
291	}
292	cleanup:
293	WPACKET_cleanup(&pkt);
294	return aid;
295	}
296
297	static int rsa_setup_md(PROV_RSA_CTX ctx, const char mdname,
298	const char *mdprops)
299	{
300	if (mdprops == NULL)
301	mdprops = ctx->propq;
302
303	if (mdname != NULL) {
304	EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
305	int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
306	int md_nid = ossl_digest_rsa_sign_get_md_nid(ctx->libctx, md,
307	sha1_allowed);
308	size_t mdname_len = strlen(mdname);
309
310	if (md == NULL
311	\|\| md_nid <= 0
312	\|\| !rsa_check_padding(ctx, mdname, NULL, md_nid)
313	\|\| mdname_len >= sizeof(ctx->mdname)) {
314	if (md == NULL)
315	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
316	"%s could not be fetched", mdname);
317	if (md_nid <= 0)
318	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
319	"digest=%s", mdname);
320	if (mdname_len >= sizeof(ctx->mdname))
321	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
322	"%s exceeds name buffer length", mdname);
323	EVP_MD_free(md);
324	return 0;
325	}
326
327	if (!ctx->flag_allow_md) {
328	if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
329	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
330	"digest %s != %s", mdname, ctx->mdname);
331	EVP_MD_free(md);
332	return 0;
333	}
334	EVP_MD_free(md);
335	return 1;
336	}
337
338	if (!ctx->mgf1_md_set) {
339	if (!EVP_MD_up_ref(md)) {
340	EVP_MD_free(md);
341	return 0;
342	}
343	EVP_MD_free(ctx->mgf1_md);
344	ctx->mgf1_md = md;
345	ctx->mgf1_mdnid = md_nid;
346	OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
347	}
348
349	EVP_MD_CTX_free(ctx->mdctx);
350	EVP_MD_free(ctx->md);
351
352	ctx->mdctx = NULL;
353	ctx->md = md;
354	ctx->mdnid = md_nid;
355	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
356	}
357
358	return 1;
359	}
360
361	static int rsa_setup_mgf1_md(PROV_RSA_CTX ctx, const char mdname,
362	const char *mdprops)
363	{
364	size_t len;
365	EVP_MD *md = NULL;
366	int mdnid;
367
368	if (mdprops == NULL)
369	mdprops = ctx->propq;
370
371	if ((md = EVP_MD_fetch(ctx->libctx, mdname, mdprops)) == NULL) {
372	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
373	"%s could not be fetched", mdname);
374	return 0;
375	}
376	/* The default for mgf1 is SHA1 - so allow SHA1 */
377	if ((mdnid = ossl_digest_rsa_sign_get_md_nid(ctx->libctx, md, 1)) <= 0
378	\|\| !rsa_check_padding(ctx, NULL, mdname, mdnid)) {
379	if (mdnid <= 0)
380	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
381	"digest=%s", mdname);
382	EVP_MD_free(md);
383	return 0;
384	}
385	len = OPENSSL_strlcpy(ctx->mgf1_mdname, mdname, sizeof(ctx->mgf1_mdname));
386	if (len >= sizeof(ctx->mgf1_mdname)) {
387	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
388	"%s exceeds name buffer length", mdname);
389	EVP_MD_free(md);
390	return 0;
391	}
392
393	EVP_MD_free(ctx->mgf1_md);
394	ctx->mgf1_md = md;
395	ctx->mgf1_mdnid = mdnid;
396	ctx->mgf1_md_set = 1;
397	return 1;
398	}
399
400	static int rsa_signverify_init(void vprsactx, void vrsa,
401	const OSSL_PARAM params[], int operation)
402	{
403	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
404
405	if (!ossl_prov_is_running() \|\| prsactx == NULL)
406	return 0;
407
408	if (vrsa == NULL && prsactx->rsa == NULL) {
409	ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
410	return 0;
411	}
412
413	if (vrsa != NULL) {
414	if (!ossl_rsa_check_key(prsactx->libctx, vrsa, operation))
415	return 0;
416
417	if (!RSA_up_ref(vrsa))
418	return 0;
419	RSA_free(prsactx->rsa);
420	prsactx->rsa = vrsa;
421	}
422
423	prsactx->operation = operation;
424
425	/* Maximize up to digest length for sign, auto for verify */
426	prsactx->saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
427	prsactx->min_saltlen = -1;
428
429	switch (RSA_test_flags(prsactx->rsa, RSA_FLAG_TYPE_MASK)) {
430	case RSA_FLAG_TYPE_RSA:
431	prsactx->pad_mode = RSA_PKCS1_PADDING;
432	break;
433	case RSA_FLAG_TYPE_RSASSAPSS:
434	prsactx->pad_mode = RSA_PKCS1_PSS_PADDING;
435
436	{
437	const RSA_PSS_PARAMS_30 *pss =
438	ossl_rsa_get0_pss_params_30(prsactx->rsa);
439
440	if (!ossl_rsa_pss_params_30_is_unrestricted(pss)) {
441	int md_nid = ossl_rsa_pss_params_30_hashalg(pss);
442	int mgf1md_nid = ossl_rsa_pss_params_30_maskgenhashalg(pss);
443	int min_saltlen = ossl_rsa_pss_params_30_saltlen(pss);
444	const char mdname, mgf1mdname;
445	size_t len;
446
447	mdname = ossl_rsa_oaeppss_nid2name(md_nid);
448	mgf1mdname = ossl_rsa_oaeppss_nid2name(mgf1md_nid);
449
450	if (mdname == NULL) {
451	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
452	"PSS restrictions lack hash algorithm");
453	return 0;
454	}
455	if (mgf1mdname == NULL) {
456	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
457	"PSS restrictions lack MGF1 hash algorithm");
458	return 0;
459	}
460
461	len = OPENSSL_strlcpy(prsactx->mdname, mdname,
462	sizeof(prsactx->mdname));
463	if (len >= sizeof(prsactx->mdname)) {
464	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
465	"hash algorithm name too long");
466	return 0;
467	}
468	len = OPENSSL_strlcpy(prsactx->mgf1_mdname, mgf1mdname,
469	sizeof(prsactx->mgf1_mdname));
470	if (len >= sizeof(prsactx->mgf1_mdname)) {
471	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
472	"MGF1 hash algorithm name too long");
473	return 0;
474	}
475	prsactx->saltlen = min_saltlen;
476
477	/* call rsa_setup_mgf1_md before rsa_setup_md to avoid duplication */
478	if (!rsa_setup_mgf1_md(prsactx, mgf1mdname, prsactx->propq)
479	\|\| !rsa_setup_md(prsactx, mdname, prsactx->propq)
480	\|\| !rsa_check_parameters(prsactx, min_saltlen))
481	return 0;
482	}
483	}
484
485	break;
486	default:
487	ERR_raise(ERR_LIB_RSA, PROV_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
488	return 0;
489	}
490
491	if (!rsa_set_ctx_params(prsactx, params))
492	return 0;
493
494	return 1;
495	}
496
497	static int setup_tbuf(PROV_RSA_CTX *ctx)
498	{
499	if (ctx->tbuf != NULL)
500	return 1;
501	if ((ctx->tbuf = OPENSSL_malloc(RSA_size(ctx->rsa))) == NULL) {
502	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
503	return 0;
504	}
505	return 1;
506	}
507
508	static void clean_tbuf(PROV_RSA_CTX *ctx)
509	{
510	if (ctx->tbuf != NULL)
511	OPENSSL_cleanse(ctx->tbuf, RSA_size(ctx->rsa));
512	}
513
514	static void free_tbuf(PROV_RSA_CTX *ctx)
515	{
516	clean_tbuf(ctx);
517	OPENSSL_free(ctx->tbuf);
518	ctx->tbuf = NULL;
519	}
520
521	static int rsa_sign_init(void vprsactx, void vrsa, const OSSL_PARAM params[])
522	{
523	if (!ossl_prov_is_running())
524	return 0;
525	return rsa_signverify_init(vprsactx, vrsa, params, EVP_PKEY_OP_SIGN);
526	}
527
528	static int rsa_sign(void vprsactx, unsigned char sig, size_t *siglen,
529	size_t sigsize, const unsigned char *tbs, size_t tbslen)
530	{
531	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
532	int ret;
533	size_t rsasize = RSA_size(prsactx->rsa);
534	size_t mdsize = rsa_get_md_size(prsactx);
535
536	if (!ossl_prov_is_running())
537	return 0;
538
539	if (sig == NULL) {
540	*siglen = rsasize;
541	return 1;
542	}
543
544	if (sigsize < rsasize) {
545	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SIGNATURE_SIZE,
546	"is %zu, should be at least %zu", sigsize, rsasize);
547	return 0;
548	}
549
550	if (mdsize != 0) {
551	if (tbslen != mdsize) {
552	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH);
553	return 0;
554	}
555
556	#ifndef FIPS_MODULE
557	if (EVP_MD_is_a(prsactx->md, OSSL_DIGEST_NAME_MDC2)) {
558	unsigned int sltmp;
559
560	if (prsactx->pad_mode != RSA_PKCS1_PADDING) {
561	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
562	"only PKCS#1 padding supported with MDC2");
563	return 0;
564	}
565	ret = RSA_sign_ASN1_OCTET_STRING(0, tbs, tbslen, sig, &sltmp,
566	prsactx->rsa);
567
568	if (ret <= 0) {
569	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
570	return 0;
571	}
572	ret = sltmp;
573	goto end;
574	}
575	#endif
576	switch (prsactx->pad_mode) {
577	case RSA_X931_PADDING:
578	if ((size_t)RSA_size(prsactx->rsa) < tbslen + 1) {
579	ERR_raise_data(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL,
580	"RSA key size = %d, expected minimum = %d",
581	RSA_size(prsactx->rsa), tbslen + 1);
582	return 0;
583	}
584	if (!setup_tbuf(prsactx)) {
585	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
586	return 0;
587	}
588	memcpy(prsactx->tbuf, tbs, tbslen);
589	prsactx->tbuf[tbslen] = RSA_X931_hash_id(prsactx->mdnid);
590	ret = RSA_private_encrypt(tbslen + 1, prsactx->tbuf,
591	sig, prsactx->rsa, RSA_X931_PADDING);
592	clean_tbuf(prsactx);
593	break;
594
595	case RSA_PKCS1_PADDING:
596	{
597	unsigned int sltmp;
598
599	ret = RSA_sign(prsactx->mdnid, tbs, tbslen, sig, &sltmp,
600	prsactx->rsa);
601	if (ret <= 0) {
602	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
603	return 0;
604	}
605	ret = sltmp;
606	}
607	break;
608
609	case RSA_PKCS1_PSS_PADDING:
610	/* Check PSS restrictions */
611	if (rsa_pss_restricted(prsactx)) {
612	switch (prsactx->saltlen) {
613	case RSA_PSS_SALTLEN_DIGEST:
614	if (prsactx->min_saltlen > EVP_MD_get_size(prsactx->md)) {
615	ERR_raise_data(ERR_LIB_PROV,
616	PROV_R_PSS_SALTLEN_TOO_SMALL,
617	"minimum salt length set to %d, "
618	"but the digest only gives %d",
619	prsactx->min_saltlen,
620	EVP_MD_get_size(prsactx->md));
621	return 0;
622	}
623	/* FALLTHRU */
624	default:
625	if (prsactx->saltlen >= 0
626	&& prsactx->saltlen < prsactx->min_saltlen) {
627	ERR_raise_data(ERR_LIB_PROV,
628	PROV_R_PSS_SALTLEN_TOO_SMALL,
629	"minimum salt length set to %d, but the"
630	"actual salt length is only set to %d",
631	prsactx->min_saltlen,
632	prsactx->saltlen);
633	return 0;
634	}
635	break;
636	}
637	}
638	if (!setup_tbuf(prsactx))
639	return 0;
640	if (!RSA_padding_add_PKCS1_PSS_mgf1(prsactx->rsa,
641	prsactx->tbuf, tbs,
642	prsactx->md, prsactx->mgf1_md,
643	prsactx->saltlen)) {
644	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
645	return 0;
646	}
647	ret = RSA_private_encrypt(RSA_size(prsactx->rsa), prsactx->tbuf,
648	sig, prsactx->rsa, RSA_NO_PADDING);
649	clean_tbuf(prsactx);
650	break;
651
652	default:
653	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
654	"Only X.931, PKCS#1 v1.5 or PSS padding allowed");
655	return 0;
656	}
657	} else {
658	ret = RSA_private_encrypt(tbslen, tbs, sig, prsactx->rsa,
659	prsactx->pad_mode);
660	}
661
662	#ifndef FIPS_MODULE
663	end:
664	#endif
665	if (ret <= 0) {
666	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
667	return 0;
668	}
669
670	*siglen = ret;
671	return 1;
672	}
673
674	static int rsa_verify_recover_init(void vprsactx, void vrsa,
675	const OSSL_PARAM params[])
676	{
677	if (!ossl_prov_is_running())
678	return 0;
679	return rsa_signverify_init(vprsactx, vrsa, params,
680	EVP_PKEY_OP_VERIFYRECOVER);
681	}
682
683	static int rsa_verify_recover(void *vprsactx,
684	unsigned char *rout,
685	size_t *routlen,
686	size_t routsize,
687	const unsigned char *sig,
688	size_t siglen)
689	{
690	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
691	int ret;
692
693	if (!ossl_prov_is_running())
694	return 0;
695
696	if (rout == NULL) {
697	*routlen = RSA_size(prsactx->rsa);
698	return 1;
699	}
700
701	if (prsactx->md != NULL) {
702	switch (prsactx->pad_mode) {
703	case RSA_X931_PADDING:
704	if (!setup_tbuf(prsactx))
705	return 0;
706	ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
707	RSA_X931_PADDING);
708	if (ret < 1) {
709	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
710	return 0;
711	}
712	ret--;
713	if (prsactx->tbuf[ret] != RSA_X931_hash_id(prsactx->mdnid)) {
714	ERR_raise(ERR_LIB_PROV, PROV_R_ALGORITHM_MISMATCH);
715	return 0;
716	}
717	if (ret != EVP_MD_get_size(prsactx->md)) {
718	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
719	"Should be %d, but got %d",
720	EVP_MD_get_size(prsactx->md), ret);
721	return 0;
722	}
723
724	*routlen = ret;
725	if (rout != prsactx->tbuf) {
726	if (routsize < (size_t)ret) {
727	ERR_raise_data(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL,
728	"buffer size is %d, should be %d",
729	routsize, ret);
730	return 0;
731	}
732	memcpy(rout, prsactx->tbuf, ret);
733	}
734	break;
735
736	case RSA_PKCS1_PADDING:
737	{
738	size_t sltmp;
739
740	ret = ossl_rsa_verify(prsactx->mdnid, NULL, 0, rout, &sltmp,
741	sig, siglen, prsactx->rsa);
742	if (ret <= 0) {
743	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
744	return 0;
745	}
746	ret = sltmp;
747	}
748	break;
749
750	default:
751	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
752	"Only X.931 or PKCS#1 v1.5 padding allowed");
753	return 0;
754	}
755	} else {
756	ret = RSA_public_decrypt(siglen, sig, rout, prsactx->rsa,
757	prsactx->pad_mode);
758	if (ret < 0) {
759	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
760	return 0;
761	}
762	}
763	*routlen = ret;
764	return 1;
765	}
766
767	static int rsa_verify_init(void vprsactx, void vrsa,
768	const OSSL_PARAM params[])
769	{
770	if (!ossl_prov_is_running())
771	return 0;
772	return rsa_signverify_init(vprsactx, vrsa, params, EVP_PKEY_OP_VERIFY);
773	}
774
775	static int rsa_verify(void vprsactx, const unsigned char sig, size_t siglen,
776	const unsigned char *tbs, size_t tbslen)
777	{
778	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
779	size_t rslen;
780
781	if (!ossl_prov_is_running())
782	return 0;
783	if (prsactx->md != NULL) {
784	switch (prsactx->pad_mode) {
785	case RSA_PKCS1_PADDING:
786	if (!RSA_verify(prsactx->mdnid, tbs, tbslen, sig, siglen,
787	prsactx->rsa)) {
788	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
789	return 0;
790	}
791	return 1;
792	case RSA_X931_PADDING:
793	if (!setup_tbuf(prsactx))
794	return 0;
795	if (rsa_verify_recover(prsactx, prsactx->tbuf, &rslen, 0,
796	sig, siglen) <= 0)
797	return 0;
798	break;
799	case RSA_PKCS1_PSS_PADDING:
800	{
801	int ret;
802	size_t mdsize;
803
804	/*
805	* We need to check this for the RSA_verify_PKCS1_PSS_mgf1()
806	* call
807	*/
808	mdsize = rsa_get_md_size(prsactx);
809	if (tbslen != mdsize) {
810	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_LENGTH,
811	"Should be %d, but got %d",
812	mdsize, tbslen);
813	return 0;
814	}
815
816	if (!setup_tbuf(prsactx))
817	return 0;
818	ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf,
819	prsactx->rsa, RSA_NO_PADDING);
820	if (ret <= 0) {
821	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
822	return 0;
823	}
824	ret = RSA_verify_PKCS1_PSS_mgf1(prsactx->rsa, tbs,
825	prsactx->md, prsactx->mgf1_md,
826	prsactx->tbuf,
827	prsactx->saltlen);
828	if (ret <= 0) {
829	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
830	return 0;
831	}
832	return 1;
833	}
834	default:
835	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_PADDING_MODE,
836	"Only X.931, PKCS#1 v1.5 or PSS padding allowed");
837	return 0;
838	}
839	} else {
840	int ret;
841
842	if (!setup_tbuf(prsactx))
843	return 0;
844	ret = RSA_public_decrypt(siglen, sig, prsactx->tbuf, prsactx->rsa,
845	prsactx->pad_mode);
846	if (ret <= 0) {
847	ERR_raise(ERR_LIB_PROV, ERR_R_RSA_LIB);
848	return 0;
849	}
850	rslen = (size_t)ret;
851	}
852
853	if ((rslen != tbslen) \|\| memcmp(tbs, prsactx->tbuf, rslen))
854	return 0;
855
856	return 1;
857	}
858
859	static int rsa_digest_signverify_init(void vprsactx, const char mdname,
860	void *vrsa, const OSSL_PARAM params[],
861	int operation)
862	{
863	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
864
865	if (!ossl_prov_is_running())
866	return 0;
867
868	if (!rsa_signverify_init(vprsactx, vrsa, params, operation))
869	return 0;
870
871	if (mdname != NULL
872	/* was rsa_setup_md already called in rsa_signverify_init()? */
873	&& (mdname[0] == '\0' \|\| OPENSSL_strcasecmp(prsactx->mdname, mdname) != 0)
874	&& !rsa_setup_md(prsactx, mdname, prsactx->propq))
875	return 0;
876
877	prsactx->flag_allow_md = 0;
878
879	if (prsactx->mdctx == NULL) {
880	prsactx->mdctx = EVP_MD_CTX_new();
881	if (prsactx->mdctx == NULL)
882	goto error;
883	}
884
885	if (!EVP_DigestInit_ex2(prsactx->mdctx, prsactx->md, params))
886	goto error;
887
888	return 1;
889
890	error:
891	EVP_MD_CTX_free(prsactx->mdctx);
892	prsactx->mdctx = NULL;
893	return 0;
894	}
895
896	static int rsa_digest_signverify_update(void *vprsactx,
897	const unsigned char *data,
898	size_t datalen)
899	{
900	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
901
902	if (prsactx == NULL \|\| prsactx->mdctx == NULL)
903	return 0;
904
905	return EVP_DigestUpdate(prsactx->mdctx, data, datalen);
906	}
907
908	static int rsa_digest_sign_init(void vprsactx, const char mdname,
909	void *vrsa, const OSSL_PARAM params[])
910	{
911	if (!ossl_prov_is_running())
912	return 0;
913	return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
914	params, EVP_PKEY_OP_SIGN);
915	}
916
917	static int rsa_digest_sign_final(void vprsactx, unsigned char sig,
918	size_t *siglen, size_t sigsize)
919	{
920	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
921	unsigned char digest[EVP_MAX_MD_SIZE];
922	unsigned int dlen = 0;
923
924	if (!ossl_prov_is_running() \|\| prsactx == NULL)
925	return 0;
926	prsactx->flag_allow_md = 1;
927	if (prsactx->mdctx == NULL)
928	return 0;
929	/*
930	* If sig is NULL then we're just finding out the sig size. Other fields
931	* are ignored. Defer to rsa_sign.
932	*/
933	if (sig != NULL) {
934	/*
935	* The digests used here are all known (see rsa_get_md_nid()), so they
936	* should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
937	*/
938	if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
939	return 0;
940	}
941
942	return rsa_sign(vprsactx, sig, siglen, sigsize, digest, (size_t)dlen);
943	}
944
945	static int rsa_digest_verify_init(void vprsactx, const char mdname,
946	void *vrsa, const OSSL_PARAM params[])
947	{
948	if (!ossl_prov_is_running())
949	return 0;
950	return rsa_digest_signverify_init(vprsactx, mdname, vrsa,
951	params, EVP_PKEY_OP_VERIFY);
952	}
953
954	int rsa_digest_verify_final(void vprsactx, const unsigned char sig,
955	size_t siglen)
956	{
957	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
958	unsigned char digest[EVP_MAX_MD_SIZE];
959	unsigned int dlen = 0;
960
961	if (!ossl_prov_is_running())
962	return 0;
963
964	if (prsactx == NULL)
965	return 0;
966	prsactx->flag_allow_md = 1;
967	if (prsactx->mdctx == NULL)
968	return 0;
969
970	/*
971	* The digests used here are all known (see rsa_get_md_nid()), so they
972	* should not exceed the internal buffer size of EVP_MAX_MD_SIZE.
973	*/
974	if (!EVP_DigestFinal_ex(prsactx->mdctx, digest, &dlen))
975	return 0;
976
977	return rsa_verify(vprsactx, sig, siglen, digest, (size_t)dlen);
978	}
979
980	static void rsa_freectx(void *vprsactx)
981	{
982	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
983
984	if (prsactx == NULL)
985	return;
986
987	EVP_MD_CTX_free(prsactx->mdctx);
988	EVP_MD_free(prsactx->md);
989	EVP_MD_free(prsactx->mgf1_md);
990	OPENSSL_free(prsactx->propq);
991	free_tbuf(prsactx);
992	RSA_free(prsactx->rsa);
993
994	OPENSSL_clear_free(prsactx, sizeof(*prsactx));
995	}
996
997	static void rsa_dupctx(void vprsactx)
998	{
999	PROV_RSA_CTX srcctx = (PROV_RSA_CTX )vprsactx;
1000	PROV_RSA_CTX *dstctx;
1001
1002	if (!ossl_prov_is_running())
1003	return NULL;
1004
1005	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
1006	if (dstctx == NULL) {
1007	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
1008	return NULL;
1009	}
1010
1011	dstctx = srcctx;
1012	dstctx->rsa = NULL;
1013	dstctx->md = NULL;
1014	dstctx->mgf1_md = NULL;
1015	dstctx->mdctx = NULL;
1016	dstctx->tbuf = NULL;
1017	dstctx->propq = NULL;
1018
1019	if (srcctx->rsa != NULL && !RSA_up_ref(srcctx->rsa))
1020	goto err;
1021	dstctx->rsa = srcctx->rsa;
1022
1023	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
1024	goto err;
1025	dstctx->md = srcctx->md;
1026
1027	if (srcctx->mgf1_md != NULL && !EVP_MD_up_ref(srcctx->mgf1_md))
1028	goto err;
1029	dstctx->mgf1_md = srcctx->mgf1_md;
1030
1031	if (srcctx->mdctx != NULL) {
1032	dstctx->mdctx = EVP_MD_CTX_new();
1033	if (dstctx->mdctx == NULL
1034	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
1035	goto err;
1036	}
1037
1038	if (srcctx->propq != NULL) {
1039	dstctx->propq = OPENSSL_strdup(srcctx->propq);
1040	if (dstctx->propq == NULL)
1041	goto err;
1042	}
1043
1044	return dstctx;
1045	err:
1046	rsa_freectx(dstctx);
1047	return NULL;
1048	}
1049
1050	static int rsa_get_ctx_params(void vprsactx, OSSL_PARAM params)
1051	{
1052	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1053	OSSL_PARAM *p;
1054
1055	if (prsactx == NULL)
1056	return 0;
1057
1058	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
1059	if (p != NULL) {
1060	/* The Algorithm Identifier of the combined signature algorithm */
1061	unsigned char aid_buf[128];
1062	unsigned char *aid;
1063	size_t aid_len;
1064
1065	aid = rsa_generate_signature_aid(prsactx, aid_buf,
1066	sizeof(aid_buf), &aid_len);
1067	if (aid == NULL \|\| !OSSL_PARAM_set_octet_string(p, aid, aid_len))
1068	return 0;
1069	}
1070
1071	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
1072	if (p != NULL)
1073	switch (p->data_type) {
1074	case OSSL_PARAM_INTEGER:
1075	if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
1076	return 0;
1077	break;
1078	case OSSL_PARAM_UTF8_STRING:
1079	{
1080	int i;
1081	const char *word = NULL;
1082
1083	for (i = 0; padding_item[i].id != 0; i++) {
1084	if (prsactx->pad_mode == (int)padding_item[i].id) {
1085	word = padding_item[i].ptr;
1086	break;
1087	}
1088	}
1089
1090	if (word != NULL) {
1091	if (!OSSL_PARAM_set_utf8_string(p, word))
1092	return 0;
1093	} else {
1094	ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
1095	}
1096	}
1097	break;
1098	default:
1099	return 0;
1100	}
1101
1102	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
1103	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mdname))
1104	return 0;
1105
1106	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
1107	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->mgf1_mdname))
1108	return 0;
1109
1110	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
1111	if (p != NULL) {
1112	if (p->data_type == OSSL_PARAM_INTEGER) {
1113	if (!OSSL_PARAM_set_int(p, prsactx->saltlen))
1114	return 0;
1115	} else if (p->data_type == OSSL_PARAM_UTF8_STRING) {
1116	const char *value = NULL;
1117
1118	switch (prsactx->saltlen) {
1119	case RSA_PSS_SALTLEN_DIGEST:
1120	value = OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST;
1121	break;
1122	case RSA_PSS_SALTLEN_MAX:
1123	value = OSSL_PKEY_RSA_PSS_SALT_LEN_MAX;
1124	break;
1125	case RSA_PSS_SALTLEN_AUTO:
1126	value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO;
1127	break;
1128	case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX:
1129	value = OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX;
1130	break;
1131	default:
1132	{
1133	int len = BIO_snprintf(p->data, p->data_size, "%d",
1134	prsactx->saltlen);
1135
1136	if (len <= 0)
1137	return 0;
1138	p->return_size = len;
1139	break;
1140	}
1141	}
1142	if (value != NULL
1143	&& !OSSL_PARAM_set_utf8_string(p, value))
1144	return 0;
1145	}
1146	}
1147
1148	return 1;
1149	}
1150
1151	static const OSSL_PARAM known_gettable_ctx_params[] = {
1152	OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
1153	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1154	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1155	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1156	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1157	OSSL_PARAM_END
1158	};
1159
1160	static const OSSL_PARAM rsa_gettable_ctx_params(ossl_unused void vprsactx,
1161	ossl_unused void *provctx)
1162	{
1163	return known_gettable_ctx_params;
1164	}
1165
1166	static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
1167	{
1168	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1169	const OSSL_PARAM *p;
1170	int pad_mode;
1171	int saltlen;
1172	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = NULL;
1173	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = NULL;
1174	char mgf1mdname[OSSL_MAX_NAME_SIZE] = "", *pmgf1mdname = NULL;
1175	char mgf1mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmgf1mdprops = NULL;
1176
1177	if (prsactx == NULL)
1178	return 0;
1179	if (params == NULL)
1180	return 1;
1181
1182	pad_mode = prsactx->pad_mode;
1183	saltlen = prsactx->saltlen;
1184
1185	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
1186	if (p != NULL) {
1187	const OSSL_PARAM *propsp =
1188	OSSL_PARAM_locate_const(params,
1189	OSSL_SIGNATURE_PARAM_PROPERTIES);
1190
1191	pmdname = mdname;
1192	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
1193	return 0;
1194
1195	if (propsp != NULL) {
1196	pmdprops = mdprops;
1197	if (!OSSL_PARAM_get_utf8_string(propsp,
1198	&pmdprops, sizeof(mdprops)))
1199	return 0;
1200	}
1201	}
1202
1203	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PAD_MODE);
1204	if (p != NULL) {
1205	const char *err_extra_text = NULL;
1206
1207	switch (p->data_type) {
1208	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1209	if (!OSSL_PARAM_get_int(p, &pad_mode))
1210	return 0;
1211	break;
1212	case OSSL_PARAM_UTF8_STRING:
1213	{
1214	int i;
1215
1216	if (p->data == NULL)
1217	return 0;
1218
1219	for (i = 0; padding_item[i].id != 0; i++) {
1220	if (strcmp(p->data, padding_item[i].ptr) == 0) {
1221	pad_mode = padding_item[i].id;
1222	break;
1223	}
1224	}
1225	}
1226	break;
1227	default:
1228	return 0;
1229	}
1230
1231	switch (pad_mode) {
1232	case RSA_PKCS1_OAEP_PADDING:
1233	/*
1234	* OAEP padding is for asymmetric cipher only so is not compatible
1235	* with signature use.
1236	*/
1237	err_extra_text = "OAEP padding not allowed for signing / verifying";
1238	goto bad_pad;
1239	case RSA_PKCS1_PSS_PADDING:
1240	if ((prsactx->operation
1241	& (EVP_PKEY_OP_SIGN \| EVP_PKEY_OP_VERIFY)) == 0) {
1242	err_extra_text =
1243	"PSS padding only allowed for sign and verify operations";
1244	goto bad_pad;
1245	}
1246	break;
1247	case RSA_PKCS1_PADDING:
1248	err_extra_text = "PKCS#1 padding not allowed with RSA-PSS";
1249	goto cont;
1250	case RSA_NO_PADDING:
1251	err_extra_text = "No padding not allowed with RSA-PSS";
1252	goto cont;
1253	case RSA_X931_PADDING:
1254	err_extra_text = "X.931 padding not allowed with RSA-PSS";
1255	cont:
1256	if (RSA_test_flags(prsactx->rsa,
1257	RSA_FLAG_TYPE_MASK) == RSA_FLAG_TYPE_RSA)
1258	break;
1259	/* FALLTHRU */
1260	default:
1261	bad_pad:
1262	if (err_extra_text == NULL)
1263	ERR_raise(ERR_LIB_PROV,
1264	PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
1265	else
1266	ERR_raise_data(ERR_LIB_PROV,
1267	PROV_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE,
1268	err_extra_text);
1269	return 0;
1270	}
1271	}
1272
1273	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_PSS_SALTLEN);
1274	if (p != NULL) {
1275	if (pad_mode != RSA_PKCS1_PSS_PADDING) {
1276	ERR_raise_data(ERR_LIB_PROV, PROV_R_NOT_SUPPORTED,
1277	"PSS saltlen can only be specified if "
1278	"PSS padding has been specified first");
1279	return 0;
1280	}
1281
1282	switch (p->data_type) {
1283	case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
1284	if (!OSSL_PARAM_get_int(p, &saltlen))
1285	return 0;
1286	break;
1287	case OSSL_PARAM_UTF8_STRING:
1288	if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST) == 0)
1289	saltlen = RSA_PSS_SALTLEN_DIGEST;
1290	else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_MAX) == 0)
1291	saltlen = RSA_PSS_SALTLEN_MAX;
1292	else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO) == 0)
1293	saltlen = RSA_PSS_SALTLEN_AUTO;
1294	else if (strcmp(p->data, OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO_DIGEST_MAX) == 0)
1295	saltlen = RSA_PSS_SALTLEN_AUTO_DIGEST_MAX;
1296	else
1297	saltlen = atoi(p->data);
1298	break;
1299	default:
1300	return 0;
1301	}
1302
1303	/*
1304	* RSA_PSS_SALTLEN_AUTO_DIGEST_MAX seems curiously named in this check.
1305	* Contrary to what it's name suggests, it's the currently lowest
1306	* saltlen number possible.
1307	*/
1308	if (saltlen < RSA_PSS_SALTLEN_AUTO_DIGEST_MAX) {
1309	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
1310	return 0;
1311	}
1312
1313	if (rsa_pss_restricted(prsactx)) {
1314	switch (saltlen) {
1315	case RSA_PSS_SALTLEN_AUTO:
1316	case RSA_PSS_SALTLEN_AUTO_DIGEST_MAX:
1317	if (prsactx->operation == EVP_PKEY_OP_VERIFY) {
1318	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH,
1319	"Cannot use autodetected salt length");
1320	return 0;
1321	}
1322	break;
1323	case RSA_PSS_SALTLEN_DIGEST:
1324	if (prsactx->min_saltlen > EVP_MD_get_size(prsactx->md)) {
1325	ERR_raise_data(ERR_LIB_PROV,
1326	PROV_R_PSS_SALTLEN_TOO_SMALL,
1327	"Should be more than %d, but would be "
1328	"set to match digest size (%d)",
1329	prsactx->min_saltlen,
1330	EVP_MD_get_size(prsactx->md));
1331	return 0;
1332	}
1333	break;
1334	default:
1335	if (saltlen >= 0 && saltlen < prsactx->min_saltlen) {
1336	ERR_raise_data(ERR_LIB_PROV,
1337	PROV_R_PSS_SALTLEN_TOO_SMALL,
1338	"Should be more than %d, "
1339	"but would be set to %d",
1340	prsactx->min_saltlen, saltlen);
1341	return 0;
1342	}
1343	}
1344	}
1345	}
1346
1347	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_MGF1_DIGEST);
1348	if (p != NULL) {
1349	const OSSL_PARAM *propsp =
1350	OSSL_PARAM_locate_const(params,
1351	OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES);
1352
1353	pmgf1mdname = mgf1mdname;
1354	if (!OSSL_PARAM_get_utf8_string(p, &pmgf1mdname, sizeof(mgf1mdname)))
1355	return 0;
1356
1357	if (propsp != NULL) {
1358	pmgf1mdprops = mgf1mdprops;
1359	if (!OSSL_PARAM_get_utf8_string(propsp,
1360	&pmgf1mdprops, sizeof(mgf1mdprops)))
1361	return 0;
1362	}
1363
1364	if (pad_mode != RSA_PKCS1_PSS_PADDING) {
1365	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MGF1_MD);
1366	return 0;
1367	}
1368	}
1369
1370	prsactx->saltlen = saltlen;
1371	prsactx->pad_mode = pad_mode;
1372
1373	if (prsactx->md == NULL && pmdname == NULL
1374	&& pad_mode == RSA_PKCS1_PSS_PADDING)
1375	pmdname = RSA_DEFAULT_DIGEST_NAME;
1376
1377	if (pmgf1mdname != NULL
1378	&& !rsa_setup_mgf1_md(prsactx, pmgf1mdname, pmgf1mdprops))
1379	return 0;
1380
1381	if (pmdname != NULL) {
1382	if (!rsa_setup_md(prsactx, pmdname, pmdprops))
1383	return 0;
1384	} else {
1385	if (!rsa_check_padding(prsactx, NULL, NULL, prsactx->mdnid))
1386	return 0;
1387	}
1388	return 1;
1389	}
1390
1391	static const OSSL_PARAM settable_ctx_params[] = {
1392	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
1393	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
1394	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1395	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1396	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
1397	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1398	OSSL_PARAM_END
1399	};
1400
1401	static const OSSL_PARAM settable_ctx_params_no_digest[] = {
1402	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE, NULL, 0),
1403	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_DIGEST, NULL, 0),
1404	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES, NULL, 0),
1405	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PSS_SALTLEN, NULL, 0),
1406	OSSL_PARAM_END
1407	};
1408
1409	static const OSSL_PARAM rsa_settable_ctx_params(void vprsactx,
1410	ossl_unused void *provctx)
1411	{
1412	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1413
1414	if (prsactx != NULL && !prsactx->flag_allow_md)
1415	return settable_ctx_params_no_digest;
1416	return settable_ctx_params;
1417	}
1418
1419	static int rsa_get_ctx_md_params(void vprsactx, OSSL_PARAM params)
1420	{
1421	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1422
1423	if (prsactx->mdctx == NULL)
1424	return 0;
1425
1426	return EVP_MD_CTX_get_params(prsactx->mdctx, params);
1427	}
1428
1429	static const OSSL_PARAM rsa_gettable_ctx_md_params(void vprsactx)
1430	{
1431	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1432
1433	if (prsactx->md == NULL)
1434	return 0;
1435
1436	return EVP_MD_gettable_ctx_params(prsactx->md);
1437	}
1438
1439	static int rsa_set_ctx_md_params(void *vprsactx, const OSSL_PARAM params[])
1440	{
1441	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1442
1443	if (prsactx->mdctx == NULL)
1444	return 0;
1445
1446	return EVP_MD_CTX_set_params(prsactx->mdctx, params);
1447	}
1448
1449	static const OSSL_PARAM rsa_settable_ctx_md_params(void vprsactx)
1450	{
1451	PROV_RSA_CTX prsactx = (PROV_RSA_CTX )vprsactx;
1452
1453	if (prsactx->md == NULL)
1454	return 0;
1455
1456	return EVP_MD_settable_ctx_params(prsactx->md);
1457	}
1458
1459	const OSSL_DISPATCH ossl_rsa_signature_functions[] = {
1460	{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))rsa_newctx },
1461	{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))rsa_sign_init },
1462	{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))rsa_sign },
1463	{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))rsa_verify_init },
1464	{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))rsa_verify },
1465	{ OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT,
1466	(void (*)(void))rsa_verify_recover_init },
1467	{ OSSL_FUNC_SIGNATURE_VERIFY_RECOVER,
1468	(void (*)(void))rsa_verify_recover },
1469	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
1470	(void (*)(void))rsa_digest_sign_init },
1471	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
1472	(void (*)(void))rsa_digest_signverify_update },
1473	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
1474	(void (*)(void))rsa_digest_sign_final },
1475	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
1476	(void (*)(void))rsa_digest_verify_init },
1477	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
1478	(void (*)(void))rsa_digest_signverify_update },
1479	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
1480	(void (*)(void))rsa_digest_verify_final },
1481	{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))rsa_freectx },
1482	{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))rsa_dupctx },
1483	{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))rsa_get_ctx_params },
1484	{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
1485	(void (*)(void))rsa_gettable_ctx_params },
1486	{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))rsa_set_ctx_params },
1487	{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
1488	(void (*)(void))rsa_settable_ctx_params },
1489	{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
1490	(void (*)(void))rsa_get_ctx_md_params },
1491	{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
1492	(void (*)(void))rsa_gettable_ctx_md_params },
1493	{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
1494	(void (*)(void))rsa_set_ctx_md_params },
1495	{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
1496	(void (*)(void))rsa_settable_ctx_md_params },
1497	{ 0, NULL }
1498	};

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source: vbox/trunk/src/libs/openssl-3.1.5/providers/implementations/signature/rsa_sig.c@ 105132

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