1 /* crypto/rsa/rsa_pmeth.c */
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
61 #include "internal/cryptlib.h"
62 #include <openssl/asn1t.h>
63 #include <openssl/x509.h>
64 #include <openssl/rsa.h>
65 #include <openssl/bn.h>
66 #include <openssl/evp.h>
67 #include <openssl/x509v3.h>
68 #ifndef OPENSSL_NO_CMS
69 # include <openssl/cms.h>
71 #include "internal/evp_int.h"
74 /* RSA pkey context structure */
77 /* Key gen parameters */
80 /* Keygen callback info */
82 /* RSA padding mode */
86 /* message digest for MGF1 */
93 unsigned char *oaep_label
;
97 static int pkey_rsa_init(EVP_PKEY_CTX
*ctx
)
100 rctx
= OPENSSL_zalloc(sizeof(*rctx
));
104 rctx
->pad_mode
= RSA_PKCS1_PADDING
;
107 ctx
->keygen_info
= rctx
->gentmp
;
108 ctx
->keygen_info_count
= 2;
113 static int pkey_rsa_copy(EVP_PKEY_CTX
*dst
, EVP_PKEY_CTX
*src
)
115 RSA_PKEY_CTX
*dctx
, *sctx
;
116 if (!pkey_rsa_init(dst
))
120 dctx
->nbits
= sctx
->nbits
;
122 dctx
->pub_exp
= BN_dup(sctx
->pub_exp
);
126 dctx
->pad_mode
= sctx
->pad_mode
;
128 dctx
->mgf1md
= sctx
->mgf1md
;
129 if (sctx
->oaep_label
) {
130 OPENSSL_free(dctx
->oaep_label
);
131 dctx
->oaep_label
= BUF_memdup(sctx
->oaep_label
, sctx
->oaep_labellen
);
132 if (!dctx
->oaep_label
)
134 dctx
->oaep_labellen
= sctx
->oaep_labellen
;
139 static int setup_tbuf(RSA_PKEY_CTX
*ctx
, EVP_PKEY_CTX
*pk
)
143 ctx
->tbuf
= OPENSSL_malloc(EVP_PKEY_size(pk
->pkey
));
144 if (ctx
->tbuf
== NULL
)
149 static void pkey_rsa_cleanup(EVP_PKEY_CTX
*ctx
)
151 RSA_PKEY_CTX
*rctx
= ctx
->data
;
153 BN_free(rctx
->pub_exp
);
154 OPENSSL_free(rctx
->tbuf
);
155 OPENSSL_free(rctx
->oaep_label
);
160 static int pkey_rsa_sign(EVP_PKEY_CTX
*ctx
, unsigned char *sig
,
161 size_t *siglen
, const unsigned char *tbs
,
165 RSA_PKEY_CTX
*rctx
= ctx
->data
;
166 RSA
*rsa
= ctx
->pkey
->pkey
.rsa
;
169 if (tbslen
!= (size_t)EVP_MD_size(rctx
->md
)) {
170 RSAerr(RSA_F_PKEY_RSA_SIGN
, RSA_R_INVALID_DIGEST_LENGTH
);
174 if (EVP_MD_type(rctx
->md
) == NID_mdc2
) {
176 if (rctx
->pad_mode
!= RSA_PKCS1_PADDING
)
178 ret
= RSA_sign_ASN1_OCTET_STRING(NID_mdc2
,
179 tbs
, tbslen
, sig
, &sltmp
, rsa
);
184 } else if (rctx
->pad_mode
== RSA_X931_PADDING
) {
185 if ((size_t)EVP_PKEY_size(ctx
->pkey
) < tbslen
+ 1) {
186 RSAerr(RSA_F_PKEY_RSA_SIGN
, RSA_R_KEY_SIZE_TOO_SMALL
);
189 if (!setup_tbuf(rctx
, ctx
)) {
190 RSAerr(RSA_F_PKEY_RSA_SIGN
, ERR_R_MALLOC_FAILURE
);
193 memcpy(rctx
->tbuf
, tbs
, tbslen
);
194 rctx
->tbuf
[tbslen
] = RSA_X931_hash_id(EVP_MD_type(rctx
->md
));
195 ret
= RSA_private_encrypt(tbslen
+ 1, rctx
->tbuf
,
196 sig
, rsa
, RSA_X931_PADDING
);
197 } else if (rctx
->pad_mode
== RSA_PKCS1_PADDING
) {
199 ret
= RSA_sign(EVP_MD_type(rctx
->md
),
200 tbs
, tbslen
, sig
, &sltmp
, rsa
);
204 } else if (rctx
->pad_mode
== RSA_PKCS1_PSS_PADDING
) {
205 if (!setup_tbuf(rctx
, ctx
))
207 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa
,
209 rctx
->md
, rctx
->mgf1md
,
212 ret
= RSA_private_encrypt(RSA_size(rsa
), rctx
->tbuf
,
213 sig
, rsa
, RSA_NO_PADDING
);
217 ret
= RSA_private_encrypt(tbslen
, tbs
, sig
, ctx
->pkey
->pkey
.rsa
,
225 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX
*ctx
,
226 unsigned char *rout
, size_t *routlen
,
227 const unsigned char *sig
, size_t siglen
)
230 RSA_PKEY_CTX
*rctx
= ctx
->data
;
233 if (rctx
->pad_mode
== RSA_X931_PADDING
) {
234 if (!setup_tbuf(rctx
, ctx
))
236 ret
= RSA_public_decrypt(siglen
, sig
,
237 rctx
->tbuf
, ctx
->pkey
->pkey
.rsa
,
242 if (rctx
->tbuf
[ret
] != RSA_X931_hash_id(EVP_MD_type(rctx
->md
))) {
243 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER
,
244 RSA_R_ALGORITHM_MISMATCH
);
247 if (ret
!= EVP_MD_size(rctx
->md
)) {
248 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER
,
249 RSA_R_INVALID_DIGEST_LENGTH
);
253 memcpy(rout
, rctx
->tbuf
, ret
);
254 } else if (rctx
->pad_mode
== RSA_PKCS1_PADDING
) {
256 ret
= int_rsa_verify(EVP_MD_type(rctx
->md
),
257 NULL
, 0, rout
, &sltmp
,
258 sig
, siglen
, ctx
->pkey
->pkey
.rsa
);
265 ret
= RSA_public_decrypt(siglen
, sig
, rout
, ctx
->pkey
->pkey
.rsa
,
273 static int pkey_rsa_verify(EVP_PKEY_CTX
*ctx
,
274 const unsigned char *sig
, size_t siglen
,
275 const unsigned char *tbs
, size_t tbslen
)
277 RSA_PKEY_CTX
*rctx
= ctx
->data
;
278 RSA
*rsa
= ctx
->pkey
->pkey
.rsa
;
281 if (rctx
->pad_mode
== RSA_PKCS1_PADDING
)
282 return RSA_verify(EVP_MD_type(rctx
->md
), tbs
, tbslen
,
284 if (rctx
->pad_mode
== RSA_X931_PADDING
) {
285 if (pkey_rsa_verifyrecover(ctx
, NULL
, &rslen
, sig
, siglen
) <= 0)
287 } else if (rctx
->pad_mode
== RSA_PKCS1_PSS_PADDING
) {
289 if (!setup_tbuf(rctx
, ctx
))
291 ret
= RSA_public_decrypt(siglen
, sig
, rctx
->tbuf
,
292 rsa
, RSA_NO_PADDING
);
295 ret
= RSA_verify_PKCS1_PSS_mgf1(rsa
, tbs
,
296 rctx
->md
, rctx
->mgf1md
,
297 rctx
->tbuf
, rctx
->saltlen
);
304 if (!setup_tbuf(rctx
, ctx
))
306 rslen
= RSA_public_decrypt(siglen
, sig
, rctx
->tbuf
,
307 rsa
, rctx
->pad_mode
);
312 if ((rslen
!= tbslen
) || memcmp(tbs
, rctx
->tbuf
, rslen
))
319 static int pkey_rsa_encrypt(EVP_PKEY_CTX
*ctx
,
320 unsigned char *out
, size_t *outlen
,
321 const unsigned char *in
, size_t inlen
)
324 RSA_PKEY_CTX
*rctx
= ctx
->data
;
325 if (rctx
->pad_mode
== RSA_PKCS1_OAEP_PADDING
) {
326 int klen
= RSA_size(ctx
->pkey
->pkey
.rsa
);
327 if (!setup_tbuf(rctx
, ctx
))
329 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx
->tbuf
, klen
,
333 rctx
->md
, rctx
->mgf1md
))
335 ret
= RSA_public_encrypt(klen
, rctx
->tbuf
, out
,
336 ctx
->pkey
->pkey
.rsa
, RSA_NO_PADDING
);
338 ret
= RSA_public_encrypt(inlen
, in
, out
, ctx
->pkey
->pkey
.rsa
,
346 static int pkey_rsa_decrypt(EVP_PKEY_CTX
*ctx
,
347 unsigned char *out
, size_t *outlen
,
348 const unsigned char *in
, size_t inlen
)
351 RSA_PKEY_CTX
*rctx
= ctx
->data
;
352 if (rctx
->pad_mode
== RSA_PKCS1_OAEP_PADDING
) {
354 if (!setup_tbuf(rctx
, ctx
))
356 ret
= RSA_private_decrypt(inlen
, in
, rctx
->tbuf
,
357 ctx
->pkey
->pkey
.rsa
, RSA_NO_PADDING
);
360 for (i
= 0; i
< ret
; i
++) {
364 ret
= RSA_padding_check_PKCS1_OAEP_mgf1(out
, ret
, rctx
->tbuf
+ i
,
368 rctx
->md
, rctx
->mgf1md
);
370 ret
= RSA_private_decrypt(inlen
, in
, out
, ctx
->pkey
->pkey
.rsa
,
378 static int check_padding_md(const EVP_MD
*md
, int padding
)
384 mdnid
= EVP_MD_type(md
);
386 if (padding
== RSA_NO_PADDING
) {
387 RSAerr(RSA_F_CHECK_PADDING_MD
, RSA_R_INVALID_PADDING_MODE
);
391 if (padding
== RSA_X931_PADDING
) {
392 if (RSA_X931_hash_id(mdnid
) == -1) {
393 RSAerr(RSA_F_CHECK_PADDING_MD
, RSA_R_INVALID_X931_DIGEST
);
398 /* List of all supported RSA digests */
413 RSAerr(RSA_F_CHECK_PADDING_MD
, RSA_R_INVALID_DIGEST
);
422 static int pkey_rsa_ctrl(EVP_PKEY_CTX
*ctx
, int type
, int p1
, void *p2
)
424 RSA_PKEY_CTX
*rctx
= ctx
->data
;
426 case EVP_PKEY_CTRL_RSA_PADDING
:
427 if ((p1
>= RSA_PKCS1_PADDING
) && (p1
<= RSA_PKCS1_PSS_PADDING
)) {
428 if (!check_padding_md(rctx
->md
, p1
))
430 if (p1
== RSA_PKCS1_PSS_PADDING
) {
431 if (!(ctx
->operation
&
432 (EVP_PKEY_OP_SIGN
| EVP_PKEY_OP_VERIFY
)))
435 rctx
->md
= EVP_sha1();
437 if (p1
== RSA_PKCS1_OAEP_PADDING
) {
438 if (!(ctx
->operation
& EVP_PKEY_OP_TYPE_CRYPT
))
441 rctx
->md
= EVP_sha1();
447 RSAerr(RSA_F_PKEY_RSA_CTRL
,
448 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE
);
451 case EVP_PKEY_CTRL_GET_RSA_PADDING
:
452 *(int *)p2
= rctx
->pad_mode
;
455 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN
:
456 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN
:
457 if (rctx
->pad_mode
!= RSA_PKCS1_PSS_PADDING
) {
458 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_INVALID_PSS_SALTLEN
);
461 if (type
== EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN
)
462 *(int *)p2
= rctx
->saltlen
;
470 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS
:
472 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_KEY_SIZE_TOO_SMALL
);
478 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP
:
481 BN_free(rctx
->pub_exp
);
485 case EVP_PKEY_CTRL_RSA_OAEP_MD
:
486 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD
:
487 if (rctx
->pad_mode
!= RSA_PKCS1_OAEP_PADDING
) {
488 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_INVALID_PADDING_MODE
);
491 if (type
== EVP_PKEY_CTRL_GET_RSA_OAEP_MD
)
492 *(const EVP_MD
**)p2
= rctx
->md
;
497 case EVP_PKEY_CTRL_MD
:
498 if (!check_padding_md(p2
, rctx
->pad_mode
))
503 case EVP_PKEY_CTRL_GET_MD
:
504 *(const EVP_MD
**)p2
= rctx
->md
;
507 case EVP_PKEY_CTRL_RSA_MGF1_MD
:
508 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD
:
509 if (rctx
->pad_mode
!= RSA_PKCS1_PSS_PADDING
510 && rctx
->pad_mode
!= RSA_PKCS1_OAEP_PADDING
) {
511 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_INVALID_MGF1_MD
);
514 if (type
== EVP_PKEY_CTRL_GET_RSA_MGF1_MD
) {
516 *(const EVP_MD
**)p2
= rctx
->mgf1md
;
518 *(const EVP_MD
**)p2
= rctx
->md
;
523 case EVP_PKEY_CTRL_RSA_OAEP_LABEL
:
524 if (rctx
->pad_mode
!= RSA_PKCS1_OAEP_PADDING
) {
525 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_INVALID_PADDING_MODE
);
528 OPENSSL_free(rctx
->oaep_label
);
530 rctx
->oaep_label
= p2
;
531 rctx
->oaep_labellen
= p1
;
533 rctx
->oaep_label
= NULL
;
534 rctx
->oaep_labellen
= 0;
538 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL
:
539 if (rctx
->pad_mode
!= RSA_PKCS1_OAEP_PADDING
) {
540 RSAerr(RSA_F_PKEY_RSA_CTRL
, RSA_R_INVALID_PADDING_MODE
);
543 *(unsigned char **)p2
= rctx
->oaep_label
;
544 return rctx
->oaep_labellen
;
546 case EVP_PKEY_CTRL_DIGESTINIT
:
547 case EVP_PKEY_CTRL_PKCS7_ENCRYPT
:
548 case EVP_PKEY_CTRL_PKCS7_DECRYPT
:
549 case EVP_PKEY_CTRL_PKCS7_SIGN
:
551 #ifndef OPENSSL_NO_CMS
552 case EVP_PKEY_CTRL_CMS_DECRYPT
:
553 case EVP_PKEY_CTRL_CMS_ENCRYPT
:
554 case EVP_PKEY_CTRL_CMS_SIGN
:
557 case EVP_PKEY_CTRL_PEER_KEY
:
558 RSAerr(RSA_F_PKEY_RSA_CTRL
,
559 RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE
);
568 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX
*ctx
,
569 const char *type
, const char *value
)
572 RSAerr(RSA_F_PKEY_RSA_CTRL_STR
, RSA_R_VALUE_MISSING
);
575 if (strcmp(type
, "rsa_padding_mode") == 0) {
577 if (strcmp(value
, "pkcs1") == 0)
578 pm
= RSA_PKCS1_PADDING
;
579 else if (strcmp(value
, "sslv23") == 0)
580 pm
= RSA_SSLV23_PADDING
;
581 else if (strcmp(value
, "none") == 0)
583 else if (strcmp(value
, "oeap") == 0)
584 pm
= RSA_PKCS1_OAEP_PADDING
;
585 else if (strcmp(value
, "oaep") == 0)
586 pm
= RSA_PKCS1_OAEP_PADDING
;
587 else if (strcmp(value
, "x931") == 0)
588 pm
= RSA_X931_PADDING
;
589 else if (strcmp(value
, "pss") == 0)
590 pm
= RSA_PKCS1_PSS_PADDING
;
592 RSAerr(RSA_F_PKEY_RSA_CTRL_STR
, RSA_R_UNKNOWN_PADDING_TYPE
);
595 return EVP_PKEY_CTX_set_rsa_padding(ctx
, pm
);
598 if (strcmp(type
, "rsa_pss_saltlen") == 0) {
600 saltlen
= atoi(value
);
601 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx
, saltlen
);
604 if (strcmp(type
, "rsa_keygen_bits") == 0) {
607 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx
, nbits
);
610 if (strcmp(type
, "rsa_keygen_pubexp") == 0) {
612 BIGNUM
*pubexp
= NULL
;
613 if (!BN_asc2bn(&pubexp
, value
))
615 ret
= EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx
, pubexp
);
621 if (strcmp(type
, "rsa_mgf1_md") == 0) {
623 if ((md
= EVP_get_digestbyname(value
)) == NULL
) {
624 RSAerr(RSA_F_PKEY_RSA_CTRL_STR
, RSA_R_INVALID_DIGEST
);
627 return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx
, md
);
630 if (strcmp(type
, "rsa_oaep_md") == 0) {
632 if ((md
= EVP_get_digestbyname(value
)) == NULL
) {
633 RSAerr(RSA_F_PKEY_RSA_CTRL_STR
, RSA_R_INVALID_DIGEST
);
636 return EVP_PKEY_CTX_set_rsa_oaep_md(ctx
, md
);
638 if (strcmp(type
, "rsa_oaep_label") == 0) {
642 lab
= string_to_hex(value
, &lablen
);
645 ret
= EVP_PKEY_CTX_set0_rsa_oaep_label(ctx
, lab
, lablen
);
654 static int pkey_rsa_keygen(EVP_PKEY_CTX
*ctx
, EVP_PKEY
*pkey
)
657 RSA_PKEY_CTX
*rctx
= ctx
->data
;
660 if (rctx
->pub_exp
== NULL
) {
661 rctx
->pub_exp
= BN_new();
662 if (rctx
->pub_exp
== NULL
|| !BN_set_word(rctx
->pub_exp
, RSA_F4
))
668 if (ctx
->pkey_gencb
) {
669 pcb
= BN_GENCB_new();
674 evp_pkey_set_cb_translate(pcb
, ctx
);
677 ret
= RSA_generate_key_ex(rsa
, rctx
->nbits
, rctx
->pub_exp
, pcb
);
680 EVP_PKEY_assign_RSA(pkey
, rsa
);
686 const EVP_PKEY_METHOD rsa_pkey_meth
= {
688 EVP_PKEY_FLAG_AUTOARGLEN
,
705 pkey_rsa_verifyrecover
,