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).
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_malloc(sizeof(RSA_PKEY_CTX));
104 rctx->pub_exp = NULL;
105 rctx->pad_mode = RSA_PKCS1_PADDING;
112 rctx->oaep_label = NULL;
113 rctx->oaep_labellen = 0;
116 ctx->keygen_info = rctx->gentmp;
117 ctx->keygen_info_count = 2;
122 static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
124 RSA_PKEY_CTX *dctx, *sctx;
125 if (!pkey_rsa_init(dst))
129 dctx->nbits = sctx->nbits;
131 dctx->pub_exp = BN_dup(sctx->pub_exp);
135 dctx->pad_mode = sctx->pad_mode;
137 dctx->mgf1md = sctx->mgf1md;
138 if (sctx->oaep_label) {
139 if (dctx->oaep_label)
140 OPENSSL_free(dctx->oaep_label);
141 dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
142 if (!dctx->oaep_label)
144 dctx->oaep_labellen = sctx->oaep_labellen;
149 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
153 ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
159 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
161 RSA_PKEY_CTX *rctx = ctx->data;
164 BN_free(rctx->pub_exp);
166 OPENSSL_free(rctx->tbuf);
167 if (rctx->oaep_label)
168 OPENSSL_free(rctx->oaep_label);
173 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
174 size_t *siglen, const unsigned char *tbs,
178 RSA_PKEY_CTX *rctx = ctx->data;
179 RSA *rsa = ctx->pkey->pkey.rsa;
182 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
183 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
187 if (EVP_MD_type(rctx->md) == NID_mdc2) {
189 if (rctx->pad_mode != RSA_PKCS1_PADDING)
191 ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
192 tbs, tbslen, sig, &sltmp, rsa);
197 } else if (rctx->pad_mode == RSA_X931_PADDING) {
198 if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
199 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
202 if (!setup_tbuf(rctx, ctx)) {
203 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
206 memcpy(rctx->tbuf, tbs, tbslen);
207 rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
208 ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
209 sig, rsa, RSA_X931_PADDING);
210 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
212 ret = RSA_sign(EVP_MD_type(rctx->md),
213 tbs, tbslen, sig, &sltmp, rsa);
217 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
218 if (!setup_tbuf(rctx, ctx))
220 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
222 rctx->md, rctx->mgf1md,
225 ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
226 sig, rsa, RSA_NO_PADDING);
230 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
238 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
239 unsigned char *rout, size_t *routlen,
240 const unsigned char *sig, size_t siglen)
243 RSA_PKEY_CTX *rctx = ctx->data;
246 if (rctx->pad_mode == RSA_X931_PADDING) {
247 if (!setup_tbuf(rctx, ctx))
249 ret = RSA_public_decrypt(siglen, sig,
250 rctx->tbuf, ctx->pkey->pkey.rsa,
255 if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
256 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
257 RSA_R_ALGORITHM_MISMATCH);
260 if (ret != EVP_MD_size(rctx->md)) {
261 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
262 RSA_R_INVALID_DIGEST_LENGTH);
266 memcpy(rout, rctx->tbuf, ret);
267 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
269 ret = int_rsa_verify(EVP_MD_type(rctx->md),
270 NULL, 0, rout, &sltmp,
271 sig, siglen, ctx->pkey->pkey.rsa);
278 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
286 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
287 const unsigned char *sig, size_t siglen,
288 const unsigned char *tbs, size_t tbslen)
290 RSA_PKEY_CTX *rctx = ctx->data;
291 RSA *rsa = ctx->pkey->pkey.rsa;
294 if (rctx->pad_mode == RSA_PKCS1_PADDING)
295 return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
297 if (rctx->pad_mode == RSA_X931_PADDING) {
298 if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
300 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
302 if (!setup_tbuf(rctx, ctx))
304 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
305 rsa, RSA_NO_PADDING);
308 ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
309 rctx->md, rctx->mgf1md,
310 rctx->tbuf, rctx->saltlen);
317 if (!setup_tbuf(rctx, ctx))
319 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
320 rsa, rctx->pad_mode);
325 if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
332 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
333 unsigned char *out, size_t *outlen,
334 const unsigned char *in, size_t inlen)
337 RSA_PKEY_CTX *rctx = ctx->data;
338 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
339 int klen = RSA_size(ctx->pkey->pkey.rsa);
340 if (!setup_tbuf(rctx, ctx))
342 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
346 rctx->md, rctx->mgf1md))
348 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
349 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
351 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
359 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
360 unsigned char *out, size_t *outlen,
361 const unsigned char *in, size_t inlen)
364 RSA_PKEY_CTX *rctx = ctx->data;
365 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
367 if (!setup_tbuf(rctx, ctx))
369 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
370 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
373 for (i = 0; i < ret; i++) {
377 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
381 rctx->md, rctx->mgf1md);
383 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
391 static int check_padding_md(const EVP_MD *md, int padding)
396 if (padding == RSA_NO_PADDING) {
397 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
401 if (padding == RSA_X931_PADDING) {
402 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
403 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
412 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
414 RSA_PKEY_CTX *rctx = ctx->data;
416 case EVP_PKEY_CTRL_RSA_PADDING:
417 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
418 if (!check_padding_md(rctx->md, p1))
420 if (p1 == RSA_PKCS1_PSS_PADDING) {
421 if (!(ctx->operation &
422 (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
425 rctx->md = EVP_sha1();
427 if (p1 == RSA_PKCS1_OAEP_PADDING) {
428 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
431 rctx->md = EVP_sha1();
437 RSAerr(RSA_F_PKEY_RSA_CTRL,
438 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
441 case EVP_PKEY_CTRL_GET_RSA_PADDING:
442 *(int *)p2 = rctx->pad_mode;
445 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
446 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
447 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
448 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
451 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
452 *(int *)p2 = rctx->saltlen;
460 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
462 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
468 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
471 BN_free(rctx->pub_exp);
475 case EVP_PKEY_CTRL_RSA_OAEP_MD:
476 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
477 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
478 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
481 if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
482 *(const EVP_MD **)p2 = rctx->md;
487 case EVP_PKEY_CTRL_MD:
488 if (!check_padding_md(p2, rctx->pad_mode))
493 case EVP_PKEY_CTRL_GET_MD:
494 *(const EVP_MD **)p2 = rctx->md;
497 case EVP_PKEY_CTRL_RSA_MGF1_MD:
498 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
499 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
500 && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
501 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
504 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
506 *(const EVP_MD **)p2 = rctx->mgf1md;
508 *(const EVP_MD **)p2 = rctx->md;
513 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
514 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
515 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
518 if (rctx->oaep_label)
519 OPENSSL_free(rctx->oaep_label);
521 rctx->oaep_label = p2;
522 rctx->oaep_labellen = p1;
524 rctx->oaep_label = NULL;
525 rctx->oaep_labellen = 0;
529 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
530 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
531 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
534 *(unsigned char **)p2 = rctx->oaep_label;
535 return rctx->oaep_labellen;
537 case EVP_PKEY_CTRL_DIGESTINIT:
538 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
539 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
540 case EVP_PKEY_CTRL_PKCS7_SIGN:
542 #ifndef OPENSSL_NO_CMS
543 case EVP_PKEY_CTRL_CMS_DECRYPT:
544 case EVP_PKEY_CTRL_CMS_ENCRYPT:
545 case EVP_PKEY_CTRL_CMS_SIGN:
548 case EVP_PKEY_CTRL_PEER_KEY:
549 RSAerr(RSA_F_PKEY_RSA_CTRL,
550 RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
559 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
560 const char *type, const char *value)
563 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
566 if (!strcmp(type, "rsa_padding_mode")) {
568 if (!strcmp(value, "pkcs1"))
569 pm = RSA_PKCS1_PADDING;
570 else if (!strcmp(value, "sslv23"))
571 pm = RSA_SSLV23_PADDING;
572 else if (!strcmp(value, "none"))
574 else if (!strcmp(value, "oeap"))
575 pm = RSA_PKCS1_OAEP_PADDING;
576 else if (!strcmp(value, "oaep"))
577 pm = RSA_PKCS1_OAEP_PADDING;
578 else if (!strcmp(value, "x931"))
579 pm = RSA_X931_PADDING;
580 else if (!strcmp(value, "pss"))
581 pm = RSA_PKCS1_PSS_PADDING;
583 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
586 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
589 if (!strcmp(type, "rsa_pss_saltlen")) {
591 saltlen = atoi(value);
592 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
595 if (!strcmp(type, "rsa_keygen_bits")) {
598 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
601 if (!strcmp(type, "rsa_keygen_pubexp")) {
603 BIGNUM *pubexp = NULL;
604 if (!BN_asc2bn(&pubexp, value))
606 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
612 if (!strcmp(type, "rsa_mgf1_md")) {
614 if (!(md = EVP_get_digestbyname(value))) {
615 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
618 return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
621 if (!strcmp(type, "rsa_oaep_md")) {
623 if (!(md = EVP_get_digestbyname(value))) {
624 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
627 return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
629 if (!strcmp(type, "rsa_oaep_label")) {
633 lab = string_to_hex(value, &lablen);
636 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
645 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
648 RSA_PKEY_CTX *rctx = ctx->data;
651 if (!rctx->pub_exp) {
652 rctx->pub_exp = BN_new();
653 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
659 if (ctx->pkey_gencb) {
660 pcb = BN_GENCB_new();
665 evp_pkey_set_cb_translate(pcb, ctx);
668 ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
671 EVP_PKEY_assign_RSA(pkey, rsa);
677 const EVP_PKEY_METHOD rsa_pkey_meth = {
679 EVP_PKEY_FLAG_AUTOARGLEN,
696 pkey_rsa_verifyrecover,