2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include <openssl/bn.h>
15 #include <openssl/cms.h>
16 #include "crypto/asn1.h"
17 #include "crypto/evp.h"
18 #include "rsa_local.h"
20 #ifndef OPENSSL_NO_CMS
21 static int rsa_cms_sign(CMS_SignerInfo *si);
22 static int rsa_cms_verify(CMS_SignerInfo *si);
23 static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
24 static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
27 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
29 /* Set any parameters associated with pkey */
30 static int rsa_param_encode(const EVP_PKEY *pkey,
31 ASN1_STRING **pstr, int *pstrtype)
33 const RSA *rsa = pkey->pkey.rsa;
36 /* If RSA it's just NULL type */
37 if (pkey->ameth->pkey_id != EVP_PKEY_RSA_PSS) {
38 *pstrtype = V_ASN1_NULL;
41 /* If no PSS parameters we omit parameters entirely */
42 if (rsa->pss == NULL) {
43 *pstrtype = V_ASN1_UNDEF;
46 /* Encode PSS parameters */
47 if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL)
50 *pstrtype = V_ASN1_SEQUENCE;
53 /* Decode any parameters and set them in RSA structure */
54 static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
56 const ASN1_OBJECT *algoid;
60 X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
61 if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
63 if (algptype == V_ASN1_UNDEF)
65 if (algptype != V_ASN1_SEQUENCE) {
66 RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS);
69 rsa->pss = rsa_pss_decode(alg);
75 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
77 unsigned char *penc = NULL;
82 if (!rsa_param_encode(pkey, &str, &strtype))
84 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
87 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
88 strtype, str, penc, penclen))
95 static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
97 const unsigned char *p;
102 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
104 if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
105 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
108 if (!rsa_param_decode(rsa, alg)) {
112 if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) {
119 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
122 * Don't check the public/private key, this is mostly for smart
125 if (((RSA_flags(a->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK))
126 || (RSA_flags(b->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK)) {
130 if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
131 || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
136 static int old_rsa_priv_decode(EVP_PKEY *pkey,
137 const unsigned char **pder, int derlen)
141 if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
142 RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
145 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
149 static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
151 return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
154 static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
156 unsigned char *rk = NULL;
161 if (!rsa_param_encode(pkey, &str, &strtype))
163 rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
166 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
167 ASN1_STRING_free(str);
171 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
172 strtype, str, rk, rklen)) {
173 RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
174 ASN1_STRING_free(str);
181 static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
183 const unsigned char *p;
186 const X509_ALGOR *alg;
188 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8))
190 rsa = d2i_RSAPrivateKey(NULL, &p, pklen);
192 RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
195 if (!rsa_param_decode(rsa, alg)) {
199 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
203 static int int_rsa_size(const EVP_PKEY *pkey)
205 return RSA_size(pkey->pkey.rsa);
208 static int rsa_bits(const EVP_PKEY *pkey)
210 return BN_num_bits(pkey->pkey.rsa->n);
213 static int rsa_security_bits(const EVP_PKEY *pkey)
215 return RSA_security_bits(pkey->pkey.rsa);
218 static void int_rsa_free(EVP_PKEY *pkey)
220 RSA_free(pkey->pkey.rsa);
223 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
225 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
227 return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
231 static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss,
235 X509_ALGOR *maskHash = NULL;
237 if (!BIO_indent(bp, indent, 128))
241 if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
245 if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
248 } else if (pss == NULL) {
249 if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
253 if (BIO_puts(bp, "\n") <= 0)
257 if (!BIO_indent(bp, indent, 128))
259 if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
262 if (pss->hashAlgorithm) {
263 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
265 } else if (BIO_puts(bp, "sha1 (default)") <= 0) {
269 if (BIO_puts(bp, "\n") <= 0)
272 if (!BIO_indent(bp, indent, 128))
275 if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
277 if (pss->maskGenAlgorithm) {
278 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
280 if (BIO_puts(bp, " with ") <= 0)
282 maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
283 if (maskHash != NULL) {
284 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
286 } else if (BIO_puts(bp, "INVALID") <= 0) {
289 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
294 if (!BIO_indent(bp, indent, 128))
296 if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
298 if (pss->saltLength) {
299 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
301 } else if (BIO_puts(bp, "14 (default)") <= 0) {
306 if (!BIO_indent(bp, indent, 128))
308 if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
310 if (pss->trailerField) {
311 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
313 } else if (BIO_puts(bp, "BC (default)") <= 0) {
321 X509_ALGOR_free(maskHash);
326 static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
328 const RSA *x = pkey->pkey.rsa;
331 int ret = 0, mod_len = 0, ex_primes;
334 mod_len = BN_num_bits(x->n);
335 ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos);
337 if (!BIO_indent(bp, off, 128))
340 if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0)
344 if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n",
345 mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0)
348 s = "publicExponent:";
350 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
355 if (!ASN1_bn_print(bp, str, x->n, NULL, off))
357 if (!ASN1_bn_print(bp, s, x->e, NULL, off))
362 if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
364 if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
366 if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
368 if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
370 if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
372 if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
374 for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) {
375 /* print multi-prime info */
377 RSA_PRIME_INFO *pinfo;
380 pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i);
381 for (j = 0; j < 3; j++) {
382 if (!BIO_indent(bp, off, 128))
386 if (BIO_printf(bp, "prime%d:", i + 3) <= 0)
391 if (BIO_printf(bp, "exponent%d:", i + 3) <= 0)
396 if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0)
403 if (!ASN1_bn_print(bp, "", bn, NULL, off))
408 if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
415 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
418 return pkey_rsa_print(bp, pkey, indent, 0);
421 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
424 return pkey_rsa_print(bp, pkey, indent, 1);
427 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
431 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
437 if (pss->maskGenAlgorithm != NULL) {
438 pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
439 if (pss->maskHash == NULL) {
440 RSA_PSS_PARAMS_free(pss);
448 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
449 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
451 if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
453 RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
455 rv = rsa_pss_param_print(bp, 0, pss, indent);
456 RSA_PSS_PARAMS_free(pss);
459 } else if (!sig && BIO_puts(bp, "\n") <= 0) {
463 return X509_signature_dump(bp, sig, indent);
467 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
469 X509_ALGOR *alg = NULL;
471 const EVP_MD *mgf1md;
476 case ASN1_PKEY_CTRL_PKCS7_SIGN:
478 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
481 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
482 if (pkey_is_pss(pkey))
485 PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
487 #ifndef OPENSSL_NO_CMS
488 case ASN1_PKEY_CTRL_CMS_SIGN:
490 return rsa_cms_sign(arg2);
492 return rsa_cms_verify(arg2);
495 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
496 if (pkey_is_pss(pkey))
499 return rsa_cms_encrypt(arg2);
501 return rsa_cms_decrypt(arg2);
504 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
505 if (pkey_is_pss(pkey))
507 *(int *)arg2 = CMS_RECIPINFO_TRANS;
511 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
512 if (pkey->pkey.rsa->pss != NULL) {
513 if (!rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md,
515 RSAerr(0, ERR_R_INTERNAL_ERROR);
518 *(int *)arg2 = EVP_MD_type(md);
519 /* Return of 2 indicates this MD is mandatory */
522 *(int *)arg2 = NID_sha256;
531 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
537 /* allocate and set algorithm ID from EVP_MD, default SHA1 */
538 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
540 if (md == NULL || EVP_MD_type(md) == NID_sha1)
542 *palg = X509_ALGOR_new();
545 X509_ALGOR_set_md(*palg, md);
549 /* Allocate and set MGF1 algorithm ID from EVP_MD */
550 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
552 X509_ALGOR *algtmp = NULL;
553 ASN1_STRING *stmp = NULL;
556 if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
558 /* need to embed algorithm ID inside another */
559 if (!rsa_md_to_algor(&algtmp, mgf1md))
561 if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
563 *palg = X509_ALGOR_new();
566 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
569 ASN1_STRING_free(stmp);
570 X509_ALGOR_free(algtmp);
576 /* convert algorithm ID to EVP_MD, default SHA1 */
577 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
583 md = EVP_get_digestbyobj(alg->algorithm);
585 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
590 * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
591 * suitable for setting an AlgorithmIdentifier.
594 static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
596 const EVP_MD *sigmd, *mgf1md;
597 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
600 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
602 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
604 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
607 saltlen = EVP_MD_size(sigmd);
608 } else if (saltlen == -2 || saltlen == -3) {
609 saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
610 if ((EVP_PKEY_bits(pk) & 0x7) == 1)
616 return rsa_pss_params_create(sigmd, mgf1md, saltlen);
619 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
620 const EVP_MD *mgf1md, int saltlen)
622 RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
627 pss->saltLength = ASN1_INTEGER_new();
628 if (pss->saltLength == NULL)
630 if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
633 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
637 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
639 if (!rsa_md_to_algor(&pss->maskHash, mgf1md))
643 RSA_PSS_PARAMS_free(pss);
647 static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
649 RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
655 os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
656 RSA_PSS_PARAMS_free(pss);
661 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
662 * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
663 * passed to pkctx instead.
666 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
667 X509_ALGOR *sigalg, EVP_PKEY *pkey)
671 const EVP_MD *mgf1md = NULL, *md = NULL;
674 /* Sanity check: make sure it is PSS */
675 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
676 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
679 /* Decode PSS parameters */
680 pss = rsa_pss_decode(sigalg);
682 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
683 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
687 /* We have all parameters now set up context */
689 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
692 const EVP_MD *checkmd;
693 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
695 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
696 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
701 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
704 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
707 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
713 RSA_PSS_PARAMS_free(pss);
717 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
718 const EVP_MD **pmgf1md, int *psaltlen)
722 *pmd = rsa_algor_to_md(pss->hashAlgorithm);
725 *pmgf1md = rsa_algor_to_md(pss->maskHash);
726 if (*pmgf1md == NULL)
728 if (pss->saltLength) {
729 *psaltlen = ASN1_INTEGER_get(pss->saltLength);
731 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
739 * low-level routines support only trailer field 0xbc (value 1) and
740 * PKCS#1 says we should reject any other value anyway.
742 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
743 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER);
750 #ifndef OPENSSL_NO_CMS
751 static int rsa_cms_verify(CMS_SignerInfo *si)
755 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
757 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
758 nid = OBJ_obj2nid(alg->algorithm);
759 if (nid == EVP_PKEY_RSA_PSS)
760 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
761 /* Only PSS allowed for PSS keys */
762 if (pkey_ctx_is_pss(pkctx)) {
763 RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
766 if (nid == NID_rsaEncryption)
768 /* Workaround for some implementation that use a signature OID */
769 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
770 if (nid2 == NID_rsaEncryption)
778 * Customised RSA item verification routine. This is called when a signature
779 * is encountered requiring special handling. We currently only handle PSS.
782 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
783 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
786 /* Sanity check: make sure it is PSS */
787 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
788 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
791 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
798 #ifndef OPENSSL_NO_CMS
799 static int rsa_cms_sign(CMS_SignerInfo *si)
801 int pad_mode = RSA_PKCS1_PADDING;
803 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
804 ASN1_STRING *os = NULL;
806 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
808 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
811 if (pad_mode == RSA_PKCS1_PADDING) {
812 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
815 /* We don't support it */
816 if (pad_mode != RSA_PKCS1_PSS_PADDING)
818 os = rsa_ctx_to_pss_string(pkctx);
821 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
826 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
827 X509_ALGOR *alg1, X509_ALGOR *alg2,
828 ASN1_BIT_STRING *sig)
831 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
833 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
835 if (pad_mode == RSA_PKCS1_PADDING)
837 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
838 ASN1_STRING *os1 = NULL;
839 os1 = rsa_ctx_to_pss_string(pkctx);
842 /* Duplicate parameters if we have to */
844 ASN1_STRING *os2 = ASN1_STRING_dup(os1);
846 ASN1_STRING_free(os1);
849 X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
850 V_ASN1_SEQUENCE, os2);
852 X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
853 V_ASN1_SEQUENCE, os1);
859 static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
860 const ASN1_STRING *sig)
865 const EVP_MD *mgf1md = NULL, *md = NULL;
868 /* Sanity check: make sure it is PSS */
869 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
871 /* Decode PSS parameters */
872 pss = rsa_pss_decode(sigalg);
873 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
875 mdnid = EVP_MD_type(md);
877 * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
878 * match and salt length must equal digest size
880 if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
881 && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
882 flags = X509_SIG_INFO_TLS;
885 /* Note: security bits half number of digest bits */
886 X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4,
890 RSA_PSS_PARAMS_free(pss);
894 #ifndef OPENSSL_NO_CMS
895 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
897 RSA_OAEP_PARAMS *oaep;
899 oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
905 if (oaep->maskGenFunc != NULL) {
906 oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
907 if (oaep->maskHash == NULL) {
908 RSA_OAEP_PARAMS_free(oaep);
915 static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
921 unsigned char *label = NULL;
923 const EVP_MD *mgf1md = NULL, *md = NULL;
924 RSA_OAEP_PARAMS *oaep;
926 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
929 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
931 nid = OBJ_obj2nid(cmsalg->algorithm);
932 if (nid == NID_rsaEncryption)
934 if (nid != NID_rsaesOaep) {
935 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
938 /* Decode OAEP parameters */
939 oaep = rsa_oaep_decode(cmsalg);
942 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
946 mgf1md = rsa_algor_to_md(oaep->maskHash);
949 md = rsa_algor_to_md(oaep->hashFunc);
953 if (oaep->pSourceFunc != NULL) {
954 X509_ALGOR *plab = oaep->pSourceFunc;
956 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
957 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
960 if (plab->parameter->type != V_ASN1_OCTET_STRING) {
961 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
965 label = plab->parameter->value.octet_string->data;
966 /* Stop label being freed when OAEP parameters are freed */
967 plab->parameter->value.octet_string->data = NULL;
968 labellen = plab->parameter->value.octet_string->length;
971 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
973 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
975 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
977 if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
983 RSA_OAEP_PARAMS_free(oaep);
987 static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
989 const EVP_MD *md, *mgf1md;
990 RSA_OAEP_PARAMS *oaep = NULL;
991 ASN1_STRING *os = NULL;
993 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
994 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
995 unsigned char *label;
997 if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
1000 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
1003 if (pad_mode == RSA_PKCS1_PADDING) {
1004 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
1008 if (pad_mode != RSA_PKCS1_OAEP_PADDING)
1010 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
1012 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
1014 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
1017 oaep = RSA_OAEP_PARAMS_new();
1020 if (!rsa_md_to_algor(&oaep->hashFunc, md))
1022 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
1025 ASN1_OCTET_STRING *los;
1026 oaep->pSourceFunc = X509_ALGOR_new();
1027 if (oaep->pSourceFunc == NULL)
1029 los = ASN1_OCTET_STRING_new();
1032 if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
1033 ASN1_OCTET_STRING_free(los);
1036 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
1037 V_ASN1_OCTET_STRING, los);
1039 /* create string with pss parameter encoding. */
1040 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
1042 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
1046 RSA_OAEP_PARAMS_free(oaep);
1047 ASN1_STRING_free(os);
1052 static int rsa_pkey_check(const EVP_PKEY *pkey)
1054 return RSA_check_key_ex(pkey->pkey.rsa, NULL);
1057 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
1061 ASN1_PKEY_SIGPARAM_NULL,
1064 "OpenSSL RSA method",
1084 old_rsa_priv_decode,
1085 old_rsa_priv_encode,
1098 const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
1101 ASN1_PKEY_SIGPARAM_NULL,
1104 "OpenSSL RSA-PSS method",