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(*rctx));
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 OPENSSL_free(dctx->oaep_label);
140 dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
141 if (!dctx->oaep_label)
143 dctx->oaep_labellen = sctx->oaep_labellen;
148 static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
152 ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
158 static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
160 RSA_PKEY_CTX *rctx = ctx->data;
162 BN_free(rctx->pub_exp);
163 OPENSSL_free(rctx->tbuf);
164 OPENSSL_free(rctx->oaep_label);
169 static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
170 size_t *siglen, const unsigned char *tbs,
174 RSA_PKEY_CTX *rctx = ctx->data;
175 RSA *rsa = ctx->pkey->pkey.rsa;
178 if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
179 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
183 if (EVP_MD_type(rctx->md) == NID_mdc2) {
185 if (rctx->pad_mode != RSA_PKCS1_PADDING)
187 ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
188 tbs, tbslen, sig, &sltmp, rsa);
193 } else if (rctx->pad_mode == RSA_X931_PADDING) {
194 if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
195 RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
198 if (!setup_tbuf(rctx, ctx)) {
199 RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
202 memcpy(rctx->tbuf, tbs, tbslen);
203 rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
204 ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
205 sig, rsa, RSA_X931_PADDING);
206 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
208 ret = RSA_sign(EVP_MD_type(rctx->md),
209 tbs, tbslen, sig, &sltmp, rsa);
213 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
214 if (!setup_tbuf(rctx, ctx))
216 if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
218 rctx->md, rctx->mgf1md,
221 ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
222 sig, rsa, RSA_NO_PADDING);
226 ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
234 static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
235 unsigned char *rout, size_t *routlen,
236 const unsigned char *sig, size_t siglen)
239 RSA_PKEY_CTX *rctx = ctx->data;
242 if (rctx->pad_mode == RSA_X931_PADDING) {
243 if (!setup_tbuf(rctx, ctx))
245 ret = RSA_public_decrypt(siglen, sig,
246 rctx->tbuf, ctx->pkey->pkey.rsa,
251 if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
252 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
253 RSA_R_ALGORITHM_MISMATCH);
256 if (ret != EVP_MD_size(rctx->md)) {
257 RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
258 RSA_R_INVALID_DIGEST_LENGTH);
262 memcpy(rout, rctx->tbuf, ret);
263 } else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
265 ret = int_rsa_verify(EVP_MD_type(rctx->md),
266 NULL, 0, rout, &sltmp,
267 sig, siglen, ctx->pkey->pkey.rsa);
274 ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
282 static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
283 const unsigned char *sig, size_t siglen,
284 const unsigned char *tbs, size_t tbslen)
286 RSA_PKEY_CTX *rctx = ctx->data;
287 RSA *rsa = ctx->pkey->pkey.rsa;
290 if (rctx->pad_mode == RSA_PKCS1_PADDING)
291 return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
293 if (rctx->pad_mode == RSA_X931_PADDING) {
294 if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
296 } else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
298 if (!setup_tbuf(rctx, ctx))
300 ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
301 rsa, RSA_NO_PADDING);
304 ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
305 rctx->md, rctx->mgf1md,
306 rctx->tbuf, rctx->saltlen);
313 if (!setup_tbuf(rctx, ctx))
315 rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
316 rsa, rctx->pad_mode);
321 if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
328 static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
329 unsigned char *out, size_t *outlen,
330 const unsigned char *in, size_t inlen)
333 RSA_PKEY_CTX *rctx = ctx->data;
334 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
335 int klen = RSA_size(ctx->pkey->pkey.rsa);
336 if (!setup_tbuf(rctx, ctx))
338 if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
342 rctx->md, rctx->mgf1md))
344 ret = RSA_public_encrypt(klen, rctx->tbuf, out,
345 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
347 ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
355 static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
356 unsigned char *out, size_t *outlen,
357 const unsigned char *in, size_t inlen)
360 RSA_PKEY_CTX *rctx = ctx->data;
361 if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
363 if (!setup_tbuf(rctx, ctx))
365 ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
366 ctx->pkey->pkey.rsa, RSA_NO_PADDING);
369 for (i = 0; i < ret; i++) {
373 ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
377 rctx->md, rctx->mgf1md);
379 ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
387 static int check_padding_md(const EVP_MD *md, int padding)
392 if (padding == RSA_NO_PADDING) {
393 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
397 if (padding == RSA_X931_PADDING) {
398 if (RSA_X931_hash_id(EVP_MD_type(md)) == -1) {
399 RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
408 static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
410 RSA_PKEY_CTX *rctx = ctx->data;
412 case EVP_PKEY_CTRL_RSA_PADDING:
413 if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
414 if (!check_padding_md(rctx->md, p1))
416 if (p1 == RSA_PKCS1_PSS_PADDING) {
417 if (!(ctx->operation &
418 (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
421 rctx->md = EVP_sha1();
423 if (p1 == RSA_PKCS1_OAEP_PADDING) {
424 if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
427 rctx->md = EVP_sha1();
433 RSAerr(RSA_F_PKEY_RSA_CTRL,
434 RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
437 case EVP_PKEY_CTRL_GET_RSA_PADDING:
438 *(int *)p2 = rctx->pad_mode;
441 case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
442 case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
443 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
444 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
447 if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
448 *(int *)p2 = rctx->saltlen;
456 case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
458 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
464 case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
467 BN_free(rctx->pub_exp);
471 case EVP_PKEY_CTRL_RSA_OAEP_MD:
472 case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
473 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
474 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
477 if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
478 *(const EVP_MD **)p2 = rctx->md;
483 case EVP_PKEY_CTRL_MD:
484 if (!check_padding_md(p2, rctx->pad_mode))
489 case EVP_PKEY_CTRL_GET_MD:
490 *(const EVP_MD **)p2 = rctx->md;
493 case EVP_PKEY_CTRL_RSA_MGF1_MD:
494 case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
495 if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
496 && rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
497 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
500 if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
502 *(const EVP_MD **)p2 = rctx->mgf1md;
504 *(const EVP_MD **)p2 = rctx->md;
509 case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
510 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
511 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
514 OPENSSL_free(rctx->oaep_label);
516 rctx->oaep_label = p2;
517 rctx->oaep_labellen = p1;
519 rctx->oaep_label = NULL;
520 rctx->oaep_labellen = 0;
524 case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
525 if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
526 RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
529 *(unsigned char **)p2 = rctx->oaep_label;
530 return rctx->oaep_labellen;
532 case EVP_PKEY_CTRL_DIGESTINIT:
533 case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
534 case EVP_PKEY_CTRL_PKCS7_DECRYPT:
535 case EVP_PKEY_CTRL_PKCS7_SIGN:
537 #ifndef OPENSSL_NO_CMS
538 case EVP_PKEY_CTRL_CMS_DECRYPT:
539 case EVP_PKEY_CTRL_CMS_ENCRYPT:
540 case EVP_PKEY_CTRL_CMS_SIGN:
543 case EVP_PKEY_CTRL_PEER_KEY:
544 RSAerr(RSA_F_PKEY_RSA_CTRL,
545 RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
554 static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
555 const char *type, const char *value)
558 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
561 if (strcmp(type, "rsa_padding_mode") == 0) {
563 if (strcmp(value, "pkcs1") == 0)
564 pm = RSA_PKCS1_PADDING;
565 else if (strcmp(value, "sslv23") == 0)
566 pm = RSA_SSLV23_PADDING;
567 else if (strcmp(value, "none") == 0)
569 else if (strcmp(value, "oeap") == 0)
570 pm = RSA_PKCS1_OAEP_PADDING;
571 else if (strcmp(value, "oaep") == 0)
572 pm = RSA_PKCS1_OAEP_PADDING;
573 else if (strcmp(value, "x931") == 0)
574 pm = RSA_X931_PADDING;
575 else if (strcmp(value, "pss") == 0)
576 pm = RSA_PKCS1_PSS_PADDING;
578 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
581 return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
584 if (strcmp(type, "rsa_pss_saltlen") == 0) {
586 saltlen = atoi(value);
587 return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
590 if (strcmp(type, "rsa_keygen_bits") == 0) {
593 return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
596 if (strcmp(type, "rsa_keygen_pubexp") == 0) {
598 BIGNUM *pubexp = NULL;
599 if (!BN_asc2bn(&pubexp, value))
601 ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
607 if (strcmp(type, "rsa_mgf1_md") == 0) {
609 if ((md = EVP_get_digestbyname(value)) == NULL) {
610 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
613 return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
616 if (strcmp(type, "rsa_oaep_md") == 0) {
618 if ((md = EVP_get_digestbyname(value)) == NULL) {
619 RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
622 return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
624 if (strcmp(type, "rsa_oaep_label") == 0) {
628 lab = string_to_hex(value, &lablen);
631 ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
640 static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
643 RSA_PKEY_CTX *rctx = ctx->data;
646 if (!rctx->pub_exp) {
647 rctx->pub_exp = BN_new();
648 if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
654 if (ctx->pkey_gencb) {
655 pcb = BN_GENCB_new();
660 evp_pkey_set_cb_translate(pcb, ctx);
663 ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
666 EVP_PKEY_assign_RSA(pkey, rsa);
672 const EVP_PKEY_METHOD rsa_pkey_meth = {
674 EVP_PKEY_FLAG_AUTOARGLEN,
691 pkey_rsa_verifyrecover,