2 * Copyright 2006-2020 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
11 * RSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include "internal/cryptlib.h"
18 #include <openssl/asn1t.h>
19 #include <openssl/x509.h>
20 #include <openssl/bn.h>
21 #include <openssl/cms.h>
22 #include <openssl/core_names.h>
23 #include <openssl/param_build.h>
24 #include "crypto/asn1.h"
25 #include "crypto/evp.h"
26 #include "crypto/rsa.h"
27 #include "rsa_local.h"
29 #ifndef OPENSSL_NO_CMS
30 static int rsa_cms_sign(CMS_SignerInfo *si);
31 static int rsa_cms_verify(CMS_SignerInfo *si);
32 static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
33 static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
36 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
38 /* Set any parameters associated with pkey */
39 static int rsa_param_encode(const EVP_PKEY *pkey,
40 ASN1_STRING **pstr, int *pstrtype)
42 const RSA *rsa = pkey->pkey.rsa;
45 /* If RSA it's just NULL type */
46 if (RSA_test_flags(rsa, RSA_FLAG_TYPE_MASK) != RSA_FLAG_TYPE_RSASSAPSS) {
47 *pstrtype = V_ASN1_NULL;
50 /* If no PSS parameters we omit parameters entirely */
51 if (rsa->pss == NULL) {
52 *pstrtype = V_ASN1_UNDEF;
55 /* Encode PSS parameters */
56 if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL)
59 *pstrtype = V_ASN1_SEQUENCE;
62 /* Decode any parameters and set them in RSA structure */
63 static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
65 const ASN1_OBJECT *algoid;
69 X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
70 if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
72 if (algptype == V_ASN1_UNDEF)
74 if (algptype != V_ASN1_SEQUENCE) {
75 RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS);
78 rsa->pss = rsa_pss_decode(alg);
84 static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
86 unsigned char *penc = NULL;
91 if (!rsa_param_encode(pkey, &str, &strtype))
93 penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
96 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
97 strtype, str, penc, penclen))
104 static int rsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
106 const unsigned char *p;
111 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
113 if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
114 RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
117 if (!rsa_param_decode(rsa, alg)) {
121 if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) {
128 static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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)) {
200 RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);
201 switch (pkey->ameth->pkey_id) {
203 RSA_set_flags(rsa, RSA_FLAG_TYPE_RSA);
205 case EVP_PKEY_RSA_PSS:
206 RSA_set_flags(rsa, RSA_FLAG_TYPE_RSASSAPSS);
209 /* Leave the type bits zero */
213 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
217 static int int_rsa_size(const EVP_PKEY *pkey)
219 return RSA_size(pkey->pkey.rsa);
222 static int rsa_bits(const EVP_PKEY *pkey)
224 return BN_num_bits(pkey->pkey.rsa->n);
227 static int rsa_security_bits(const EVP_PKEY *pkey)
229 return RSA_security_bits(pkey->pkey.rsa);
232 static void int_rsa_free(EVP_PKEY *pkey)
234 RSA_free(pkey->pkey.rsa);
237 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
239 if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
241 return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
245 static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss,
249 X509_ALGOR *maskHash = NULL;
251 if (!BIO_indent(bp, indent, 128))
255 if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
259 if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
262 } else if (pss == NULL) {
263 if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
267 if (BIO_puts(bp, "\n") <= 0)
271 if (!BIO_indent(bp, indent, 128))
273 if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
276 if (pss->hashAlgorithm) {
277 if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
279 } else if (BIO_puts(bp, "sha1 (default)") <= 0) {
283 if (BIO_puts(bp, "\n") <= 0)
286 if (!BIO_indent(bp, indent, 128))
289 if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
291 if (pss->maskGenAlgorithm) {
292 if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
294 if (BIO_puts(bp, " with ") <= 0)
296 maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
297 if (maskHash != NULL) {
298 if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
300 } else if (BIO_puts(bp, "INVALID") <= 0) {
303 } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
308 if (!BIO_indent(bp, indent, 128))
310 if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
312 if (pss->saltLength) {
313 if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
315 } else if (BIO_puts(bp, "14 (default)") <= 0) {
320 if (!BIO_indent(bp, indent, 128))
322 if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
324 if (pss->trailerField) {
325 if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
327 } else if (BIO_puts(bp, "BC (default)") <= 0) {
335 X509_ALGOR_free(maskHash);
340 static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
342 const RSA *x = pkey->pkey.rsa;
345 int ret = 0, mod_len = 0, ex_primes;
348 mod_len = BN_num_bits(x->n);
349 ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos);
351 if (!BIO_indent(bp, off, 128))
354 if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0)
358 if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n",
359 mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0)
362 s = "publicExponent:";
364 if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
369 if (!ASN1_bn_print(bp, str, x->n, NULL, off))
371 if (!ASN1_bn_print(bp, s, x->e, NULL, off))
376 if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
378 if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
380 if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
382 if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
384 if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
386 if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
388 for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) {
389 /* print multi-prime info */
391 RSA_PRIME_INFO *pinfo;
394 pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i);
395 for (j = 0; j < 3; j++) {
396 if (!BIO_indent(bp, off, 128))
400 if (BIO_printf(bp, "prime%d:", i + 3) <= 0)
405 if (BIO_printf(bp, "exponent%d:", i + 3) <= 0)
410 if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0)
417 if (!ASN1_bn_print(bp, "", bn, NULL, off))
422 if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
429 static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
432 return pkey_rsa_print(bp, pkey, indent, 0);
435 static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
438 return pkey_rsa_print(bp, pkey, indent, 1);
441 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
445 pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
451 if (pss->maskGenAlgorithm != NULL) {
452 pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
453 if (pss->maskHash == NULL) {
454 RSA_PSS_PARAMS_free(pss);
462 static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
463 const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
465 if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
467 RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
469 rv = rsa_pss_param_print(bp, 0, pss, indent);
470 RSA_PSS_PARAMS_free(pss);
473 } else if (BIO_puts(bp, "\n") <= 0) {
477 return X509_signature_dump(bp, sig, indent);
481 static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
483 X509_ALGOR *alg = NULL;
485 const EVP_MD *mgf1md;
490 case ASN1_PKEY_CTRL_PKCS7_SIGN:
492 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
495 case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
496 if (pkey_is_pss(pkey))
499 PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
501 #ifndef OPENSSL_NO_CMS
502 case ASN1_PKEY_CTRL_CMS_SIGN:
504 return rsa_cms_sign(arg2);
506 return rsa_cms_verify(arg2);
509 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
510 if (pkey_is_pss(pkey))
513 return rsa_cms_encrypt(arg2);
515 return rsa_cms_decrypt(arg2);
518 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
519 if (pkey_is_pss(pkey))
521 *(int *)arg2 = CMS_RECIPINFO_TRANS;
525 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
526 if (pkey->pkey.rsa->pss != NULL) {
527 if (!rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md,
529 RSAerr(0, ERR_R_INTERNAL_ERROR);
532 *(int *)arg2 = EVP_MD_type(md);
533 /* Return of 2 indicates this MD is mandatory */
536 *(int *)arg2 = NID_sha256;
545 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
551 /* allocate and set algorithm ID from EVP_MD, default SHA1 */
552 static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
554 if (md == NULL || EVP_MD_type(md) == NID_sha1)
556 *palg = X509_ALGOR_new();
559 X509_ALGOR_set_md(*palg, md);
563 /* Allocate and set MGF1 algorithm ID from EVP_MD */
564 static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
566 X509_ALGOR *algtmp = NULL;
567 ASN1_STRING *stmp = NULL;
570 if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
572 /* need to embed algorithm ID inside another */
573 if (!rsa_md_to_algor(&algtmp, mgf1md))
575 if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
577 *palg = X509_ALGOR_new();
580 X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
583 ASN1_STRING_free(stmp);
584 X509_ALGOR_free(algtmp);
590 /* convert algorithm ID to EVP_MD, default SHA1 */
591 static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
597 md = EVP_get_digestbyobj(alg->algorithm);
599 RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
604 * Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
605 * suitable for setting an AlgorithmIdentifier.
608 static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
610 const EVP_MD *sigmd, *mgf1md;
611 EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
612 RSA *rsa = EVP_PKEY_get0_RSA(pk);
615 if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
617 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
619 if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
622 saltlen = EVP_MD_size(sigmd);
623 } else if (saltlen == -2 || saltlen == -3) {
624 saltlen = RSA_size(rsa) - EVP_MD_size(sigmd) - 2;
625 if ((EVP_PKEY_bits(pk) & 0x7) == 1)
631 return rsa_pss_params_create(sigmd, mgf1md, saltlen);
634 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
635 const EVP_MD *mgf1md, int saltlen)
637 RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
642 pss->saltLength = ASN1_INTEGER_new();
643 if (pss->saltLength == NULL)
645 if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
648 if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
652 if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
654 if (!rsa_md_to_algor(&pss->maskHash, mgf1md))
658 RSA_PSS_PARAMS_free(pss);
662 static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
664 RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
670 os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
671 RSA_PSS_PARAMS_free(pss);
676 * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
677 * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
678 * passed to pkctx instead.
681 static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
682 X509_ALGOR *sigalg, EVP_PKEY *pkey)
686 const EVP_MD *mgf1md = NULL, *md = NULL;
689 /* Sanity check: make sure it is PSS */
690 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
691 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
694 /* Decode PSS parameters */
695 pss = rsa_pss_decode(sigalg);
697 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
698 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
702 /* We have all parameters now set up context */
704 if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
707 const EVP_MD *checkmd;
708 if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
710 if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
711 RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
716 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
719 if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
722 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
728 RSA_PSS_PARAMS_free(pss);
732 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
733 const EVP_MD **pmgf1md, int *psaltlen)
737 *pmd = rsa_algor_to_md(pss->hashAlgorithm);
740 *pmgf1md = rsa_algor_to_md(pss->maskHash);
741 if (*pmgf1md == NULL)
743 if (pss->saltLength) {
744 *psaltlen = ASN1_INTEGER_get(pss->saltLength);
746 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
754 * low-level routines support only trailer field 0xbc (value 1) and
755 * PKCS#1 says we should reject any other value anyway.
757 if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
758 RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER);
765 #ifndef OPENSSL_NO_CMS
766 static int rsa_cms_verify(CMS_SignerInfo *si)
770 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
772 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
773 nid = OBJ_obj2nid(alg->algorithm);
774 if (nid == EVP_PKEY_RSA_PSS)
775 return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
776 /* Only PSS allowed for PSS keys */
777 if (pkey_ctx_is_pss(pkctx)) {
778 RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
781 if (nid == NID_rsaEncryption)
783 /* Workaround for some implementation that use a signature OID */
784 if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
785 if (nid2 == NID_rsaEncryption)
793 * Customised RSA item verification routine. This is called when a signature
794 * is encountered requiring special handling. We currently only handle PSS.
797 static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
798 X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
801 /* Sanity check: make sure it is PSS */
802 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
803 RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
806 if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
813 #ifndef OPENSSL_NO_CMS
814 static int rsa_cms_sign(CMS_SignerInfo *si)
816 int pad_mode = RSA_PKCS1_PADDING;
818 EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
819 ASN1_STRING *os = NULL;
821 CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
823 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
826 if (pad_mode == RSA_PKCS1_PADDING) {
827 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
830 /* We don't support it */
831 if (pad_mode != RSA_PKCS1_PSS_PADDING)
833 os = rsa_ctx_to_pss_string(pkctx);
836 X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
841 static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
842 X509_ALGOR *alg1, X509_ALGOR *alg2,
843 ASN1_BIT_STRING *sig)
846 EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
848 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
850 if (pad_mode == RSA_PKCS1_PADDING)
852 if (pad_mode == RSA_PKCS1_PSS_PADDING) {
853 ASN1_STRING *os1 = NULL;
854 os1 = rsa_ctx_to_pss_string(pkctx);
857 /* Duplicate parameters if we have to */
859 ASN1_STRING *os2 = ASN1_STRING_dup(os1);
861 ASN1_STRING_free(os1);
864 X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
865 V_ASN1_SEQUENCE, os2);
867 X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
868 V_ASN1_SEQUENCE, os1);
874 static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
875 const ASN1_STRING *sig)
880 const EVP_MD *mgf1md = NULL, *md = NULL;
884 /* Sanity check: make sure it is PSS */
885 if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
887 /* Decode PSS parameters */
888 pss = rsa_pss_decode(sigalg);
889 if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
891 mdnid = EVP_MD_type(md);
893 * For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
894 * match and salt length must equal digest size
896 if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
897 && mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
898 flags = X509_SIG_INFO_TLS;
901 /* Note: security bits half number of digest bits */
902 secbits = EVP_MD_size(md) * 4;
904 * SHA1 and MD5 are known to be broken. Reduce security bits so that
905 * they're no longer accepted at security level 1. The real values don't
906 * really matter as long as they're lower than 80, which is our security
908 * https://eprint.iacr.org/2020/014 puts a chosen-prefix attack for SHA1 at
910 * https://documents.epfl.ch/users/l/le/lenstra/public/papers/lat.pdf
911 * puts a chosen-prefix attack for MD5 at 2^39.
913 if (mdnid == NID_sha1)
915 else if (mdnid == NID_md5_sha1)
917 else if (mdnid == NID_md5)
919 X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, secbits,
923 RSA_PSS_PARAMS_free(pss);
927 #ifndef OPENSSL_NO_CMS
928 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
930 RSA_OAEP_PARAMS *oaep;
932 oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
938 if (oaep->maskGenFunc != NULL) {
939 oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
940 if (oaep->maskHash == NULL) {
941 RSA_OAEP_PARAMS_free(oaep);
948 static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
954 unsigned char *label = NULL;
956 const EVP_MD *mgf1md = NULL, *md = NULL;
957 RSA_OAEP_PARAMS *oaep;
959 pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
962 if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
964 nid = OBJ_obj2nid(cmsalg->algorithm);
965 if (nid == NID_rsaEncryption)
967 if (nid != NID_rsaesOaep) {
968 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
971 /* Decode OAEP parameters */
972 oaep = rsa_oaep_decode(cmsalg);
975 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
979 mgf1md = rsa_algor_to_md(oaep->maskHash);
982 md = rsa_algor_to_md(oaep->hashFunc);
986 if (oaep->pSourceFunc != NULL) {
987 X509_ALGOR *plab = oaep->pSourceFunc;
989 if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
990 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
993 if (plab->parameter->type != V_ASN1_OCTET_STRING) {
994 RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
998 label = plab->parameter->value.octet_string->data;
999 /* Stop label being freed when OAEP parameters are freed */
1000 plab->parameter->value.octet_string->data = NULL;
1001 labellen = plab->parameter->value.octet_string->length;
1004 if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
1006 if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
1008 if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
1011 && EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
1017 RSA_OAEP_PARAMS_free(oaep);
1021 static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
1023 const EVP_MD *md, *mgf1md;
1024 RSA_OAEP_PARAMS *oaep = NULL;
1025 ASN1_STRING *os = NULL;
1027 EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
1028 int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
1029 unsigned char *label;
1031 if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
1034 if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
1037 if (pad_mode == RSA_PKCS1_PADDING) {
1038 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
1042 if (pad_mode != RSA_PKCS1_OAEP_PADDING)
1044 if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
1046 if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
1048 labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
1051 oaep = RSA_OAEP_PARAMS_new();
1054 if (!rsa_md_to_algor(&oaep->hashFunc, md))
1056 if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
1059 ASN1_OCTET_STRING *los;
1060 oaep->pSourceFunc = X509_ALGOR_new();
1061 if (oaep->pSourceFunc == NULL)
1063 los = ASN1_OCTET_STRING_new();
1066 if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
1067 ASN1_OCTET_STRING_free(los);
1070 X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
1071 V_ASN1_OCTET_STRING, los);
1073 /* create string with pss parameter encoding. */
1074 if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
1076 X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
1080 RSA_OAEP_PARAMS_free(oaep);
1081 ASN1_STRING_free(os);
1086 static int rsa_pkey_check(const EVP_PKEY *pkey)
1088 return RSA_check_key_ex(pkey->pkey.rsa, NULL);
1091 static size_t rsa_pkey_dirty_cnt(const EVP_PKEY *pkey)
1093 return pkey->pkey.rsa->dirty_cnt;
1097 * For the moment, we trust the call path, where keys going through
1098 * rsa_pkey_export_to() match a KEYMGMT for the "RSA" keytype, while
1099 * keys going through rsa_pss_pkey_export_to() match a KEYMGMT for the
1100 * "RSA-PSS" keytype.
1101 * TODO(3.0) Investigate whether we should simply continue to trust the
1102 * call path, or if we should strengthen this function by checking that
1103 * |rsa_type| matches the RSA key subtype. The latter requires ensuring
1104 * that the type flag for the RSA key is properly set by other functions
1107 static int rsa_int_export_to(const EVP_PKEY *from, int rsa_type,
1108 void *to_keydata, EVP_KEYMGMT *to_keymgmt,
1109 OPENSSL_CTX *libctx, const char *propq)
1111 RSA *rsa = from->pkey.rsa;
1112 OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
1113 OSSL_PARAM *params = NULL;
1120 * If the RSA method is foreign, then we can't be sure of anything, and
1121 * can therefore not export or pretend to export.
1123 if (RSA_get_method(rsa) != RSA_PKCS1_OpenSSL())
1126 /* Public parameters must always be present */
1127 if (RSA_get0_n(rsa) == NULL || RSA_get0_e(rsa) == NULL)
1130 if (!rsa_todata(rsa, tmpl, NULL))
1133 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
1134 if (RSA_get0_d(rsa) != NULL)
1135 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
1137 if (rsa->pss != NULL) {
1138 const EVP_MD *md = NULL, *mgf1md = NULL;
1139 int md_nid, mgf1md_nid, saltlen;
1140 RSA_PSS_PARAMS_30 pss_params;
1142 if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &saltlen))
1144 md_nid = EVP_MD_type(md);
1145 mgf1md_nid = EVP_MD_type(mgf1md);
1146 if (!rsa_pss_params_30_set_defaults(&pss_params)
1147 || !rsa_pss_params_30_set_hashalg(&pss_params, md_nid)
1148 || !rsa_pss_params_30_set_maskgenhashalg(&pss_params, mgf1md_nid)
1149 || !rsa_pss_params_30_set_saltlen(&pss_params, saltlen)
1150 || !rsa_pss_params_30_todata(&pss_params, propq, tmpl, NULL))
1152 selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
1155 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
1158 /* We export, the provider imports */
1159 rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
1162 OSSL_PARAM_BLD_free_params(params);
1163 OSSL_PARAM_BLD_free(tmpl);
1167 static int rsa_int_import_from(const OSSL_PARAM params[], void *vpctx,
1170 EVP_PKEY_CTX *pctx = vpctx;
1171 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
1172 RSA *rsa = rsa_new_with_ctx(pctx->libctx);
1173 RSA_PSS_PARAMS_30 rsa_pss_params = { 0, };
1177 ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
1181 RSA_clear_flags(rsa, RSA_FLAG_TYPE_MASK);
1182 RSA_set_flags(rsa, rsa_type);
1184 if (!rsa_pss_params_30_fromdata(&rsa_pss_params, params, pctx->libctx))
1188 case RSA_FLAG_TYPE_RSA:
1190 * Were PSS parameters filled in?
1191 * In that case, something's wrong
1193 if (!rsa_pss_params_30_is_unrestricted(&rsa_pss_params))
1196 case RSA_FLAG_TYPE_RSASSAPSS:
1198 * Were PSS parameters filled in? In that case, create the old
1199 * RSA_PSS_PARAMS structure. Otherwise, this is an unrestricted key.
1201 if (!rsa_pss_params_30_is_unrestricted(&rsa_pss_params)) {
1202 /* Create the older RSA_PSS_PARAMS from RSA_PSS_PARAMS_30 data */
1203 int mdnid = rsa_pss_params_30_hashalg(&rsa_pss_params);
1204 int mgf1mdnid = rsa_pss_params_30_maskgenhashalg(&rsa_pss_params);
1205 int saltlen = rsa_pss_params_30_saltlen(&rsa_pss_params);
1206 const EVP_MD *md = EVP_get_digestbynid(mdnid);
1207 const EVP_MD *mgf1md = EVP_get_digestbynid(mgf1mdnid);
1209 if ((rsa->pss = rsa_pss_params_create(md, mgf1md, saltlen)) == NULL)
1214 /* RSA key sub-types we don't know how to handle yet */
1218 if (!rsa_fromdata(rsa, params))
1222 case RSA_FLAG_TYPE_RSA:
1223 ok = EVP_PKEY_assign_RSA(pkey, rsa);
1225 case RSA_FLAG_TYPE_RSASSAPSS:
1226 ok = EVP_PKEY_assign(pkey, EVP_PKEY_RSA_PSS, rsa);
1236 static int rsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
1237 EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
1240 return rsa_int_export_to(from, RSA_FLAG_TYPE_RSA, to_keydata,
1241 to_keymgmt, libctx, propq);
1244 static int rsa_pss_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
1245 EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
1248 return rsa_int_export_to(from, RSA_FLAG_TYPE_RSASSAPSS, to_keydata,
1249 to_keymgmt, libctx, propq);
1252 static int rsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
1254 return rsa_int_import_from(params, vpctx, RSA_FLAG_TYPE_RSA);
1257 static int rsa_pss_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
1259 return rsa_int_import_from(params, vpctx, RSA_FLAG_TYPE_RSASSAPSS);
1262 const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
1266 ASN1_PKEY_SIGPARAM_NULL,
1269 "OpenSSL RSA method",
1289 old_rsa_priv_decode,
1290 old_rsa_priv_encode,
1301 rsa_pkey_import_from
1310 const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
1313 ASN1_PKEY_SIGPARAM_NULL,
1316 "OpenSSL RSA-PSS method",
1346 rsa_pss_pkey_export_to,
1347 rsa_pss_pkey_import_from