2 * Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include "internal/constant_time_locl.h"
13 #include "internal/cryptlib.h"
14 #include <openssl/asn1t.h>
15 #include <openssl/x509.h>
16 #include <openssl/rsa.h>
17 #include <openssl/bn.h>
18 #include <openssl/evp.h>
19 #include <openssl/x509v3.h>
20 #include <openssl/cms.h>
21 #include "crypto/evp.h"
24 /* RSA pkey context structure */
27 /* Key gen parameters */
31 /* Keygen callback info */
33 /* RSA padding mode */
37 /* message digest for MGF1 */
41 /* Minimum salt length or -1 if no PSS parameter restriction */
46 unsigned char *oaep_label;
50 /* True if PSS parameters are restricted */
51 #define rsa_pss_restricted(rctx) (rctx->min_saltlen != -1)
53 static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
55 RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
60 rctx->primes = RSA_DEFAULT_PRIME_NUM;
61 if (pkey_ctx_is_pss(ctx))
62 rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
64 rctx->pad_mode = RSA_PKCS1_PADDING;
65 /* Maximum for sign, auto for verify */
66 rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
67 rctx->min_saltlen = -1;
69 ctx->keygen_info = rctx->gentmp;
70 ctx->keygen_info_count = 2;
75 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
77 RSA_PKEY_CTX *dctx, *sctx;
79 if (!pkey_rsa_init(dst))
83 dctx->nbits = sctx->nbits;
85 dctx->pub_exp = BN_dup(sctx->pub_exp);
89 dctx->pad_mode = sctx->pad_mode;
91 dctx->mgf1md = sctx->mgf1md;
92 dctx->saltlen = sctx->saltlen;
93 if (sctx->oaep_label) {
94 OPENSSL_free(dctx->oaep_label);
95 dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
96 if (!dctx->oaep_label)
98 dctx->oaep_labellen = sctx->oaep_labellen;
103 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
105 if (ctx->tbuf != NULL)
107 if ((ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey))) == NULL) {
108 RSAerr(RSA_F_SETUP_TBUF, ERR_R_MALLOC_FAILURE);
114 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
116 RSA_PKEY_CTX *rctx = ctx->data;
118 BN_free(rctx->pub_exp);
119 OPENSSL_free(rctx->tbuf);
120 OPENSSL_free(rctx->oaep_label);
125 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
126 size_t *siglen, const unsigned char *tbs,
130 RSA_PKEY_CTX *rctx = ctx->data;
131 RSA *rsa = ctx->pkey->pkey.rsa;
134 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
135 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
139 if (EVP_MD_type(rctx->md) == NID_mdc2) {
141 if (rctx->pad_mode != RSA_PKCS1_PADDING)
143 ret = RSA_sign_ASN1_OCTET_STRING(0,
144 tbs, tbslen, sig, &sltmp, rsa);
149 } else if (rctx->pad_mode == RSA_X931_PADDING) {
150 if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
151 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
154 if (!setup_tbuf(rctx, ctx)) {
155 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
158 memcpy(rctx->tbuf, tbs, tbslen);
159 rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
160 ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
161 sig, rsa, RSA_X931_PADDING);
162 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
164 ret = RSA_sign(EVP_MD_type(rctx->md),
165 tbs, tbslen, sig, &sltmp, rsa);
169 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
170 if (!setup_tbuf(rctx, ctx))
172 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
174 rctx->md, rctx->mgf1md,
177 ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
178 sig, rsa, RSA_NO_PADDING);
183 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
192 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
193 unsigned char *rout, size_t *routlen,
194 const unsigned char *sig, size_t siglen)
197 RSA_PKEY_CTX *rctx = ctx->data;
200 if (rctx->pad_mode == RSA_X931_PADDING) {
201 if (!setup_tbuf(rctx, ctx))
203 ret = RSA_public_decrypt(siglen, sig,
204 rctx->tbuf, ctx->pkey->pkey.rsa,
209 if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
210 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
211 RSA_R_ALGORITHM_MISMATCH);
214 if (ret != EVP_MD_size(rctx->md)) {
215 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
216 RSA_R_INVALID_DIGEST_LENGTH);
220 memcpy(rout, rctx->tbuf, ret);
221 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
223 ret = int_rsa_verify(EVP_MD_type(rctx->md),
224 NULL, 0, rout, &sltmp,
225 sig, siglen, ctx->pkey->pkey.rsa);
233 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
242 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
243 const unsigned char *sig, size_t siglen,
244 const unsigned char *tbs, size_t tbslen)
246 RSA_PKEY_CTX *rctx = ctx->data;
247 RSA *rsa = ctx->pkey->pkey.rsa;
251 if (rctx->pad_mode == RSA_PKCS1_PADDING)
252 return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
254 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
255 RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_INVALID_DIGEST_LENGTH);
258 if (rctx->pad_mode == RSA_X931_PADDING) {
259 if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
261 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
263 if (!setup_tbuf(rctx, ctx))
265 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
266 rsa, RSA_NO_PADDING);
269 ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
270 rctx->md, rctx->mgf1md,
271 rctx->tbuf, rctx->saltlen);
279 if (!setup_tbuf(rctx, ctx))
281 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
282 rsa, rctx->pad_mode);
287 if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
294 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
295 unsigned char *out, size_t *outlen,
296 const unsigned char *in, size_t inlen)
299 RSA_PKEY_CTX *rctx = ctx->data;
301 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
302 int klen = RSA_size(ctx->pkey->pkey.rsa);
303 if (!setup_tbuf(rctx, ctx))
305 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
309 rctx->md, rctx->mgf1md))
311 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
312 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
314 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
323 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
324 unsigned char *out, size_t *outlen,
325 const unsigned char *in, size_t inlen)
328 RSA_PKEY_CTX *rctx = ctx->data;
330 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
331 if (!setup_tbuf(rctx, ctx))
333 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
334 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
337 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf,
341 rctx->md, rctx->mgf1md);
343 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
346 *outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
347 ret = constant_time_select_int(constant_time_msb(ret), ret, 1);
351 static int check_padding_md(const EVP_MD *md, int padding)
358 mdnid = EVP_MD_type(md);
360 if (padding == RSA_NO_PADDING) {
361 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
365 if (padding == RSA_X931_PADDING) {
366 if (RSA_X931_hash_id(mdnid) == -1) {
367 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
372 /* List of all supported RSA digests */
391 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
400 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
402 RSA_PKEY_CTX *rctx = ctx->data;
405 case EVP_PKEY_CTRL_RSA_PADDING:
406 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
407 if (!check_padding_md(rctx->md, p1))
409 if (p1 == RSA_PKCS1_PSS_PADDING) {
410 if (!(ctx->operation &
411 (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
414 rctx->md = EVP_sha1();
415 } else if (pkey_ctx_is_pss(ctx)) {
418 if (p1 == RSA_PKCS1_OAEP_PADDING) {
419 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
422 rctx->md = EVP_sha1();
428 RSAerr(RSA_F_PKEY_RSA_CTRL,
429 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
432 case EVP_PKEY_CTRL_GET_RSA_PADDING:
433 *(int *)p2 = rctx->pad_mode;
436 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
437 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
438 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
439 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
442 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
443 *(int *)p2 = rctx->saltlen;
445 if (p1 < RSA_PSS_SALTLEN_MAX)
447 if (rsa_pss_restricted(rctx)) {
448 if (p1 == RSA_PSS_SALTLEN_AUTO
449 && ctx->operation == EVP_PKEY_OP_VERIFY) {
450 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
453 if ((p1 == RSA_PSS_SALTLEN_DIGEST
454 && rctx->min_saltlen > EVP_MD_size(rctx->md))
455 || (p1 >= 0 && p1 < rctx->min_saltlen)) {
456 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
464 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
465 if (p1 < RSA_MIN_MODULUS_BITS) {
466 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
472 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
473 if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
474 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
477 BN_free(rctx->pub_exp);
481 case EVP_PKEY_CTRL_RSA_KEYGEN_PRIMES:
482 if (p1 < RSA_DEFAULT_PRIME_NUM || p1 > RSA_MAX_PRIME_NUM) {
483 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_PRIME_NUM_INVALID);
489 case EVP_PKEY_CTRL_RSA_OAEP_MD:
490 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
491 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
492 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
495 if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
496 *(const EVP_MD **)p2 = rctx->md;
501 case EVP_PKEY_CTRL_MD:
502 if (!check_padding_md(p2, rctx->pad_mode))
504 if (rsa_pss_restricted(rctx)) {
505 if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
507 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
513 case EVP_PKEY_CTRL_GET_MD:
514 *(const EVP_MD **)p2 = rctx->md;
517 case EVP_PKEY_CTRL_RSA_MGF1_MD:
518 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
519 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
520 && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
521 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
524 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
526 *(const EVP_MD **)p2 = rctx->mgf1md;
528 *(const EVP_MD **)p2 = rctx->md;
530 if (rsa_pss_restricted(rctx)) {
531 if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
533 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
540 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
541 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
542 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
545 OPENSSL_free(rctx->oaep_label);
547 rctx->oaep_label = p2;
548 rctx->oaep_labellen = p1;
550 rctx->oaep_label = NULL;
551 rctx->oaep_labellen = 0;
555 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
556 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
557 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
560 *(unsigned char **)p2 = rctx->oaep_label;
561 return rctx->oaep_labellen;
563 case EVP_PKEY_CTRL_DIGESTINIT:
564 case EVP_PKEY_CTRL_PKCS7_SIGN:
565 #ifndef OPENSSL_NO_CMS
566 case EVP_PKEY_CTRL_CMS_SIGN:
570 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
571 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
572 #ifndef OPENSSL_NO_CMS
573 case EVP_PKEY_CTRL_CMS_DECRYPT:
574 case EVP_PKEY_CTRL_CMS_ENCRYPT:
576 if (!pkey_ctx_is_pss(ctx))
579 case EVP_PKEY_CTRL_PEER_KEY:
580 RSAerr(RSA_F_PKEY_RSA_CTRL,
581 RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
590 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
591 const char *type, const char *value)
594 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
597 if (strcmp(type, "rsa_padding_mode") == 0) {
600 if (strcmp(value, "pkcs1") == 0) {
601 pm = RSA_PKCS1_PADDING;
602 } else if (strcmp(value, "sslv23") == 0) {
603 pm = RSA_SSLV23_PADDING;
604 } else if (strcmp(value, "none") == 0) {
606 } else if (strcmp(value, "oeap") == 0) {
607 pm = RSA_PKCS1_OAEP_PADDING;
608 } else if (strcmp(value, "oaep") == 0) {
609 pm = RSA_PKCS1_OAEP_PADDING;
610 } else if (strcmp(value, "x931") == 0) {
611 pm = RSA_X931_PADDING;
612 } else if (strcmp(value, "pss") == 0) {
613 pm = RSA_PKCS1_PSS_PADDING;
615 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
618 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
621 if (strcmp(type, "rsa_pss_saltlen") == 0) {
624 if (!strcmp(value, "digest"))
625 saltlen = RSA_PSS_SALTLEN_DIGEST;
626 else if (!strcmp(value, "max"))
627 saltlen = RSA_PSS_SALTLEN_MAX;
628 else if (!strcmp(value, "auto"))
629 saltlen = RSA_PSS_SALTLEN_AUTO;
631 saltlen = atoi(value);
632 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
635 if (strcmp(type, "rsa_keygen_bits") == 0) {
636 int nbits = atoi(value);
638 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
641 if (strcmp(type, "rsa_keygen_pubexp") == 0) {
644 BIGNUM *pubexp = NULL;
645 if (!BN_asc2bn(&pubexp, value))
647 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
653 if (strcmp(type, "rsa_keygen_primes") == 0) {
654 int nprimes = atoi(value);
656 return EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, nprimes);
659 if (strcmp(type, "rsa_mgf1_md") == 0)
660 return EVP_PKEY_CTX_md(ctx,
661 EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
662 EVP_PKEY_CTRL_RSA_MGF1_MD, value);
664 if (pkey_ctx_is_pss(ctx)) {
666 if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
667 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
668 EVP_PKEY_CTRL_RSA_MGF1_MD, value);
670 if (strcmp(type, "rsa_pss_keygen_md") == 0)
671 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
672 EVP_PKEY_CTRL_MD, value);
674 if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
675 int saltlen = atoi(value);
677 return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
681 if (strcmp(type, "rsa_oaep_md") == 0)
682 return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
683 EVP_PKEY_CTRL_RSA_OAEP_MD, value);
685 if (strcmp(type, "rsa_oaep_label") == 0) {
690 lab = OPENSSL_hexstr2buf(value, &lablen);
693 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
702 /* Set PSS parameters when generating a key, if necessary */
703 static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
705 RSA_PKEY_CTX *rctx = ctx->data;
707 if (!pkey_ctx_is_pss(ctx))
709 /* If all parameters are default values don't set pss */
710 if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
712 rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
713 rctx->saltlen == -2 ? 0 : rctx->saltlen);
714 if (rsa->pss == NULL)
719 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
722 RSA_PKEY_CTX *rctx = ctx->data;
726 if (rctx->pub_exp == NULL) {
727 rctx->pub_exp = BN_new();
728 if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
734 if (ctx->pkey_gencb) {
735 pcb = BN_GENCB_new();
740 evp_pkey_set_cb_translate(pcb, ctx);
744 ret = RSA_generate_multi_prime_key(rsa, rctx->nbits, rctx->primes,
747 if (ret > 0 && !rsa_set_pss_param(rsa, ctx)) {
752 EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, rsa);
758 static const EVP_PKEY_METHOD rsa_pkey_meth = {
760 EVP_PKEY_FLAG_AUTOARGLEN,
777 pkey_rsa_verifyrecover,
793 const EVP_PKEY_METHOD *rsa_pkey_method(void)
795 return &rsa_pkey_meth;
799 * Called for PSS sign or verify initialisation: checks PSS parameter
800 * sanity and sets any restrictions on key usage.
803 static int pkey_pss_init(EVP_PKEY_CTX *ctx)
806 RSA_PKEY_CTX *rctx = ctx->data;
808 const EVP_MD *mgf1md;
809 int min_saltlen, max_saltlen;
811 /* Should never happen */
812 if (!pkey_ctx_is_pss(ctx))
814 rsa = ctx->pkey->pkey.rsa;
815 /* If no restrictions just return */
816 if (rsa->pss == NULL)
818 /* Get and check parameters */
819 if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
822 /* See if minimum salt length exceeds maximum possible */
823 max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
824 if ((RSA_bits(rsa) & 0x7) == 1)
826 if (min_saltlen > max_saltlen) {
827 RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
831 rctx->min_saltlen = min_saltlen;
834 * Set PSS restrictions as defaults: we can then block any attempt to
835 * use invalid values in pkey_rsa_ctrl
839 rctx->mgf1md = mgf1md;
840 rctx->saltlen = min_saltlen;
845 static const EVP_PKEY_METHOD rsa_pss_pkey_meth = {
847 EVP_PKEY_FLAG_AUTOARGLEN,
863 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
869 const EVP_PKEY_METHOD *rsa_pss_pkey_method(void)
871 return &rsa_pss_pkey_meth;