2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/ec.h>
65 #include <openssl/ecdsa.h>
66 #include <openssl/evp.h>
67 #include "internal/evp_int.h"
69 /* EC pkey context structure */
72 /* Key and paramgen group */
76 /* Duplicate key if custom cofactor needed */
79 signed char cofactor_mode
;
80 /* KDF (if any) to use for ECDH */
82 /* Message digest to use for key derivation */
84 /* User key material */
85 unsigned char *kdf_ukm
;
87 /* KDF output length */
91 static int pkey_ec_init(EVP_PKEY_CTX
*ctx
)
94 dctx
= OPENSSL_malloc(sizeof(EC_PKEY_CTX
));
97 dctx
->gen_group
= NULL
;
100 dctx
->cofactor_mode
= -1;
102 dctx
->kdf_type
= EVP_PKEY_ECDH_KDF_NONE
;
104 dctx
->kdf_outlen
= 0;
105 dctx
->kdf_ukm
= NULL
;
106 dctx
->kdf_ukmlen
= 0;
113 static int pkey_ec_copy(EVP_PKEY_CTX
*dst
, EVP_PKEY_CTX
*src
)
115 EC_PKEY_CTX
*dctx
, *sctx
;
116 if (!pkey_ec_init(dst
))
120 if (sctx
->gen_group
) {
121 dctx
->gen_group
= EC_GROUP_dup(sctx
->gen_group
);
122 if (!dctx
->gen_group
)
128 dctx
->co_key
= EC_KEY_dup(sctx
->co_key
);
132 dctx
->kdf_type
= sctx
->kdf_type
;
133 dctx
->kdf_md
= sctx
->kdf_md
;
134 dctx
->kdf_outlen
= sctx
->kdf_outlen
;
136 dctx
->kdf_ukm
= BUF_memdup(sctx
->kdf_ukm
, sctx
->kdf_ukmlen
);
140 dctx
->kdf_ukm
= NULL
;
141 dctx
->kdf_ukmlen
= sctx
->kdf_ukmlen
;
145 static void pkey_ec_cleanup(EVP_PKEY_CTX
*ctx
)
147 EC_PKEY_CTX
*dctx
= ctx
->data
;
149 EC_GROUP_free(dctx
->gen_group
);
150 EC_KEY_free(dctx
->co_key
);
152 OPENSSL_free(dctx
->kdf_ukm
);
157 static int pkey_ec_sign(EVP_PKEY_CTX
*ctx
, unsigned char *sig
, size_t *siglen
,
158 const unsigned char *tbs
, size_t tbslen
)
162 EC_PKEY_CTX
*dctx
= ctx
->data
;
163 EC_KEY
*ec
= ctx
->pkey
->pkey
.ec
;
166 *siglen
= ECDSA_size(ec
);
168 } else if (*siglen
< (size_t)ECDSA_size(ec
)) {
169 ECerr(EC_F_PKEY_EC_SIGN
, EC_R_BUFFER_TOO_SMALL
);
174 type
= EVP_MD_type(dctx
->md
);
178 ret
= ECDSA_sign(type
, tbs
, tbslen
, sig
, &sltmp
, ec
);
182 *siglen
= (size_t)sltmp
;
186 static int pkey_ec_verify(EVP_PKEY_CTX
*ctx
,
187 const unsigned char *sig
, size_t siglen
,
188 const unsigned char *tbs
, size_t tbslen
)
191 EC_PKEY_CTX
*dctx
= ctx
->data
;
192 EC_KEY
*ec
= ctx
->pkey
->pkey
.ec
;
195 type
= EVP_MD_type(dctx
->md
);
199 ret
= ECDSA_verify(type
, tbs
, tbslen
, sig
, siglen
, ec
);
204 #ifndef OPENSSL_NO_EC
205 static int pkey_ec_derive(EVP_PKEY_CTX
*ctx
, unsigned char *key
,
210 const EC_POINT
*pubkey
= NULL
;
212 EC_PKEY_CTX
*dctx
= ctx
->data
;
213 if (!ctx
->pkey
|| !ctx
->peerkey
) {
214 ECerr(EC_F_PKEY_EC_DERIVE
, EC_R_KEYS_NOT_SET
);
218 eckey
= dctx
->co_key
? dctx
->co_key
: ctx
->pkey
->pkey
.ec
;
221 const EC_GROUP
*group
;
222 group
= EC_KEY_get0_group(eckey
);
223 *keylen
= (EC_GROUP_get_degree(group
) + 7) / 8;
226 pubkey
= EC_KEY_get0_public_key(ctx
->peerkey
->pkey
.ec
);
229 * NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
230 * an error, the result is truncated.
235 ret
= ECDH_compute_key(key
, outlen
, pubkey
, eckey
, 0);
242 static int pkey_ec_kdf_derive(EVP_PKEY_CTX
*ctx
,
243 unsigned char *key
, size_t *keylen
)
245 EC_PKEY_CTX
*dctx
= ctx
->data
;
246 unsigned char *ktmp
= NULL
;
249 if (dctx
->kdf_type
== EVP_PKEY_ECDH_KDF_NONE
)
250 return pkey_ec_derive(ctx
, key
, keylen
);
252 *keylen
= dctx
->kdf_outlen
;
255 if (*keylen
!= dctx
->kdf_outlen
)
257 if (!pkey_ec_derive(ctx
, NULL
, &ktmplen
))
259 ktmp
= OPENSSL_malloc(ktmplen
);
262 if (!pkey_ec_derive(ctx
, ktmp
, &ktmplen
))
265 if (!ECDH_KDF_X9_62(key
, *keylen
, ktmp
, ktmplen
,
266 dctx
->kdf_ukm
, dctx
->kdf_ukmlen
, dctx
->kdf_md
))
271 OPENSSL_clear_free(ktmp
, ktmplen
);
276 static int pkey_ec_ctrl(EVP_PKEY_CTX
*ctx
, int type
, int p1
, void *p2
)
278 EC_PKEY_CTX
*dctx
= ctx
->data
;
281 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID
:
282 group
= EC_GROUP_new_by_curve_name(p1
);
284 ECerr(EC_F_PKEY_EC_CTRL
, EC_R_INVALID_CURVE
);
287 EC_GROUP_free(dctx
->gen_group
);
288 dctx
->gen_group
= group
;
291 case EVP_PKEY_CTRL_EC_PARAM_ENC
:
292 if (!dctx
->gen_group
) {
293 ECerr(EC_F_PKEY_EC_CTRL
, EC_R_NO_PARAMETERS_SET
);
296 EC_GROUP_set_asn1_flag(dctx
->gen_group
, p1
);
299 #ifndef OPENSSL_NO_EC
300 case EVP_PKEY_CTRL_EC_ECDH_COFACTOR
:
302 if (dctx
->cofactor_mode
!= -1)
303 return dctx
->cofactor_mode
;
305 EC_KEY
*ec_key
= ctx
->pkey
->pkey
.ec
;
306 return EC_KEY_get_flags(ec_key
) & EC_FLAG_COFACTOR_ECDH
? 1 :
309 } else if (p1
< -1 || p1
> 1)
311 dctx
->cofactor_mode
= p1
;
313 EC_KEY
*ec_key
= ctx
->pkey
->pkey
.ec
;
316 /* If cofactor is 1 cofactor mode does nothing */
317 if (BN_is_one(ec_key
->group
->cofactor
))
320 dctx
->co_key
= EC_KEY_dup(ec_key
);
325 EC_KEY_set_flags(dctx
->co_key
, EC_FLAG_COFACTOR_ECDH
);
327 EC_KEY_clear_flags(dctx
->co_key
, EC_FLAG_COFACTOR_ECDH
);
329 EC_KEY_free(dctx
->co_key
);
335 case EVP_PKEY_CTRL_EC_KDF_TYPE
:
337 return dctx
->kdf_type
;
338 if (p1
!= EVP_PKEY_ECDH_KDF_NONE
&& p1
!= EVP_PKEY_ECDH_KDF_X9_62
)
343 case EVP_PKEY_CTRL_EC_KDF_MD
:
347 case EVP_PKEY_CTRL_GET_EC_KDF_MD
:
348 *(const EVP_MD
**)p2
= dctx
->kdf_md
;
351 case EVP_PKEY_CTRL_EC_KDF_OUTLEN
:
354 dctx
->kdf_outlen
= (size_t)p1
;
357 case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN
:
358 *(int *)p2
= dctx
->kdf_outlen
;
361 case EVP_PKEY_CTRL_EC_KDF_UKM
:
363 OPENSSL_free(dctx
->kdf_ukm
);
366 dctx
->kdf_ukmlen
= p1
;
368 dctx
->kdf_ukmlen
= 0;
371 case EVP_PKEY_CTRL_GET_EC_KDF_UKM
:
372 *(unsigned char **)p2
= dctx
->kdf_ukm
;
373 return dctx
->kdf_ukmlen
;
375 case EVP_PKEY_CTRL_MD
:
376 if (EVP_MD_type((const EVP_MD
*)p2
) != NID_sha1
&&
377 EVP_MD_type((const EVP_MD
*)p2
) != NID_ecdsa_with_SHA1
&&
378 EVP_MD_type((const EVP_MD
*)p2
) != NID_sha224
&&
379 EVP_MD_type((const EVP_MD
*)p2
) != NID_sha256
&&
380 EVP_MD_type((const EVP_MD
*)p2
) != NID_sha384
&&
381 EVP_MD_type((const EVP_MD
*)p2
) != NID_sha512
) {
382 ECerr(EC_F_PKEY_EC_CTRL
, EC_R_INVALID_DIGEST_TYPE
);
388 case EVP_PKEY_CTRL_GET_MD
:
389 *(const EVP_MD
**)p2
= dctx
->md
;
392 case EVP_PKEY_CTRL_PEER_KEY
:
393 /* Default behaviour is OK */
394 case EVP_PKEY_CTRL_DIGESTINIT
:
395 case EVP_PKEY_CTRL_PKCS7_SIGN
:
396 case EVP_PKEY_CTRL_CMS_SIGN
:
405 static int pkey_ec_ctrl_str(EVP_PKEY_CTX
*ctx
,
406 const char *type
, const char *value
)
408 if (!strcmp(type
, "ec_paramgen_curve")) {
410 nid
= EC_curve_nist2nid(value
);
411 if (nid
== NID_undef
)
412 nid
= OBJ_sn2nid(value
);
413 if (nid
== NID_undef
)
414 nid
= OBJ_ln2nid(value
);
415 if (nid
== NID_undef
) {
416 ECerr(EC_F_PKEY_EC_CTRL_STR
, EC_R_INVALID_CURVE
);
419 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx
, nid
);
420 } else if (!strcmp(type
, "ec_param_enc")) {
422 if (!strcmp(value
, "explicit"))
424 else if (!strcmp(value
, "named_curve"))
425 param_enc
= OPENSSL_EC_NAMED_CURVE
;
428 return EVP_PKEY_CTX_set_ec_param_enc(ctx
, param_enc
);
429 } else if (!strcmp(type
, "ecdh_kdf_md")) {
431 if (!(md
= EVP_get_digestbyname(value
))) {
432 ECerr(EC_F_PKEY_EC_CTRL_STR
, EC_R_INVALID_DIGEST
);
435 return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx
, md
);
436 } else if (!strcmp(type
, "ecdh_cofactor_mode")) {
438 co_mode
= atoi(value
);
439 return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx
, co_mode
);
445 static int pkey_ec_paramgen(EVP_PKEY_CTX
*ctx
, EVP_PKEY
*pkey
)
448 EC_PKEY_CTX
*dctx
= ctx
->data
;
450 if (dctx
->gen_group
== NULL
) {
451 ECerr(EC_F_PKEY_EC_PARAMGEN
, EC_R_NO_PARAMETERS_SET
);
457 ret
= EC_KEY_set_group(ec
, dctx
->gen_group
);
459 EVP_PKEY_assign_EC_KEY(pkey
, ec
);
465 static int pkey_ec_keygen(EVP_PKEY_CTX
*ctx
, EVP_PKEY
*pkey
)
468 EC_PKEY_CTX
*dctx
= ctx
->data
;
469 if (ctx
->pkey
== NULL
&& dctx
->gen_group
== NULL
) {
470 ECerr(EC_F_PKEY_EC_KEYGEN
, EC_R_NO_PARAMETERS_SET
);
476 EVP_PKEY_assign_EC_KEY(pkey
, ec
);
478 /* Note: if error return, pkey is freed by parent routine */
479 if (!EVP_PKEY_copy_parameters(pkey
, ctx
->pkey
))
482 if (!EC_KEY_set_group(ec
, dctx
->gen_group
))
485 return EC_KEY_generate_key(pkey
->pkey
.ec
);
488 const EVP_PKEY_METHOD ec_pkey_meth
= {
516 #ifndef OPENSSL_NO_EC