2 * Copyright 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 * ECDH/ECDSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
16 #include <openssl/core_numbers.h>
17 #include <openssl/core_names.h>
18 #include <openssl/bn.h>
19 #include <openssl/err.h>
20 #include <openssl/objects.h>
21 #include "crypto/bn.h"
22 #include "crypto/ec.h"
23 #include "prov/implementations.h"
24 #include "prov/providercommon.h"
25 #include "prov/providercommonerr.h"
26 #include "prov/provider_ctx.h"
27 #include "internal/param_build_set.h"
29 static OSSL_OP_keymgmt_new_fn ec_newdata
;
30 static OSSL_OP_keymgmt_gen_init_fn ec_gen_init
;
31 static OSSL_OP_keymgmt_gen_set_template_fn ec_gen_set_template
;
32 static OSSL_OP_keymgmt_gen_set_params_fn ec_gen_set_params
;
33 static OSSL_OP_keymgmt_gen_settable_params_fn ec_gen_settable_params
;
34 static OSSL_OP_keymgmt_gen_fn ec_gen
;
35 static OSSL_OP_keymgmt_gen_cleanup_fn ec_gen_cleanup
;
36 static OSSL_OP_keymgmt_free_fn ec_freedata
;
37 static OSSL_OP_keymgmt_get_params_fn ec_get_params
;
38 static OSSL_OP_keymgmt_gettable_params_fn ec_gettable_params
;
39 static OSSL_OP_keymgmt_set_params_fn ec_set_params
;
40 static OSSL_OP_keymgmt_settable_params_fn ec_settable_params
;
41 static OSSL_OP_keymgmt_has_fn ec_has
;
42 static OSSL_OP_keymgmt_match_fn ec_match
;
43 static OSSL_OP_keymgmt_validate_fn ec_validate
;
44 static OSSL_OP_keymgmt_import_fn ec_import
;
45 static OSSL_OP_keymgmt_import_types_fn ec_import_types
;
46 static OSSL_OP_keymgmt_export_fn ec_export
;
47 static OSSL_OP_keymgmt_export_types_fn ec_export_types
;
48 static OSSL_OP_keymgmt_query_operation_name_fn ec_query_operation_name
;
50 #define EC_DEFAULT_MD "SHA256"
51 #define EC_POSSIBLE_SELECTIONS \
52 (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS)
55 const char *ec_query_operation_name(int operation_id
)
57 switch (operation_id
) {
60 case OSSL_OP_SIGNATURE
:
67 int domparams_to_params(const EC_KEY
*ec
, OSSL_PARAM_BLD
*tmpl
,
76 ecg
= EC_KEY_get0_group(ec
);
80 curve_nid
= EC_GROUP_get_curve_name(ecg
);
82 if (curve_nid
== NID_undef
) {
83 /* TODO(3.0): should we support explicit parameters curves? */
87 const char *curve_name
= NULL
;
89 if ((curve_name
= ec_curve_nid2name(curve_nid
)) == NULL
)
91 if (!ossl_param_build_set_utf8_string(tmpl
, params
,
92 OSSL_PKEY_PARAM_GROUP_NAME
,
102 * Callers of key_to_params MUST make sure that domparams_to_params is also
105 * This function only exports the bare keypair, domain parameters and other
106 * parameters are exported separately.
109 int key_to_params(const EC_KEY
*eckey
, OSSL_PARAM_BLD
*tmpl
,
110 OSSL_PARAM params
[], int include_private
,
111 unsigned char **pub_key
)
113 BIGNUM
*x
= NULL
, *y
= NULL
;
114 const BIGNUM
*priv_key
= NULL
;
115 const EC_POINT
*pub_point
= NULL
;
116 const EC_GROUP
*ecg
= NULL
;
117 size_t pub_key_len
= 0;
119 BN_CTX
*bnctx
= NULL
;
122 || (ecg
= EC_KEY_get0_group(eckey
)) == NULL
)
125 priv_key
= EC_KEY_get0_private_key(eckey
);
126 pub_point
= EC_KEY_get0_public_key(eckey
);
128 if (pub_point
!= NULL
) {
129 OSSL_PARAM
*p
= NULL
, *px
= NULL
, *py
= NULL
;
131 * EC_POINT_point2buf() can generate random numbers in some
132 * implementations so we need to ensure we use the correct libctx.
134 bnctx
= BN_CTX_new_ex(ec_key_get_libctx(eckey
));
139 /* If we are doing a get then check first before decoding the point */
141 p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_PUB_KEY
);
142 px
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_EC_PUB_X
);
143 py
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_EC_PUB_Y
);
146 if (p
!= NULL
|| tmpl
!= NULL
) {
147 /* convert pub_point to a octet string according to the SECG standard */
148 if ((pub_key_len
= EC_POINT_point2buf(ecg
, pub_point
,
149 POINT_CONVERSION_COMPRESSED
,
150 pub_key
, bnctx
)) == 0
151 || !ossl_param_build_set_octet_string(tmpl
, p
,
152 OSSL_PKEY_PARAM_PUB_KEY
,
153 *pub_key
, pub_key_len
))
156 if (px
!= NULL
|| py
!= NULL
) {
158 x
= BN_CTX_get(bnctx
);
160 y
= BN_CTX_get(bnctx
);
162 if (!EC_POINT_get_affine_coordinates(ecg
, pub_point
, x
, y
, bnctx
))
165 && !ossl_param_build_set_bn(tmpl
, px
,
166 OSSL_PKEY_PARAM_EC_PUB_X
, x
))
169 && !ossl_param_build_set_bn(tmpl
, py
,
170 OSSL_PKEY_PARAM_EC_PUB_Y
, y
))
175 if (priv_key
!= NULL
&& include_private
) {
180 * Key import/export should never leak the bit length of the secret
183 * For this reason, on export we use padded BIGNUMs with fixed length.
185 * When importing we also should make sure that, even if short lived,
186 * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
187 * soon as possible, so that any processing of this BIGNUM might opt for
188 * constant time implementations in the backend.
190 * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
191 * to preallocate the BIGNUM internal buffer to a fixed public size big
192 * enough that operations performed during the processing never trigger
193 * a realloc which would leak the size of the scalar through memory
199 * The order of the large prime subgroup of the curve is our choice for
200 * a fixed public size, as that is generally the upper bound for
201 * generating a private key in EC cryptosystems and should fit all valid
204 * For padding on export we just use the bit length of the order
205 * converted to bytes (rounding up).
207 * For preallocating the BIGNUM storage we look at the number of "words"
208 * required for the internal representation of the order, and we
209 * preallocate 2 extra "words" in case any of the subsequent processing
210 * might temporarily overflow the order length.
212 ecbits
= EC_GROUP_order_bits(ecg
);
215 sz
= (ecbits
+ 7 ) / 8;
217 if (!ossl_param_build_set_bn_pad(tmpl
, params
,
218 OSSL_PKEY_PARAM_PRIV_KEY
,
229 int otherparams_to_params(const EC_KEY
*ec
, OSSL_PARAM_BLD
*tmpl
,
232 int ecdh_cofactor_mode
= 0;
238 (EC_KEY_get_flags(ec
) & EC_FLAG_COFACTOR_ECDH
) ? 1 : 0;
239 return ossl_param_build_set_int(tmpl
, params
,
240 OSSL_PKEY_PARAM_USE_COFACTOR_ECDH
,
245 void *ec_newdata(void *provctx
)
247 return EC_KEY_new_with_libctx(PROV_LIBRARY_CONTEXT_OF(provctx
), NULL
);
251 void ec_freedata(void *keydata
)
253 EC_KEY_free(keydata
);
257 int ec_has(void *keydata
, int selection
)
259 EC_KEY
*ec
= keydata
;
263 if ((selection
& EC_POSSIBLE_SELECTIONS
) != 0)
266 if ((selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) != 0)
267 ok
= ok
&& (EC_KEY_get0_public_key(ec
) != NULL
);
268 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0)
269 ok
= ok
&& (EC_KEY_get0_private_key(ec
) != NULL
);
270 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
271 ok
= ok
&& (EC_KEY_get0_group(ec
) != NULL
);
273 * We consider OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS to always be
274 * available, so no extra check is needed other than the previous one
275 * against EC_POSSIBLE_SELECTIONS.
281 static int ec_match(const void *keydata1
, const void *keydata2
, int selection
)
283 const EC_KEY
*ec1
= keydata1
;
284 const EC_KEY
*ec2
= keydata2
;
285 const EC_GROUP
*group_a
= EC_KEY_get0_group(ec1
);
286 const EC_GROUP
*group_b
= EC_KEY_get0_group(ec2
);
289 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
290 ok
= ok
&& group_a
!= NULL
&& group_b
!= NULL
291 && EC_GROUP_cmp(group_a
, group_b
, NULL
) == 0;
292 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0) {
293 const BIGNUM
*pa
= EC_KEY_get0_private_key(ec1
);
294 const BIGNUM
*pb
= EC_KEY_get0_private_key(ec2
);
296 ok
= ok
&& BN_cmp(pa
, pb
) == 0;
298 if ((selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) != 0) {
299 const EC_POINT
*pa
= EC_KEY_get0_public_key(ec1
);
300 const EC_POINT
*pb
= EC_KEY_get0_public_key(ec2
);
302 ok
= ok
&& EC_POINT_cmp(group_b
, pa
, pb
, NULL
);
308 int ec_import(void *keydata
, int selection
, const OSSL_PARAM params
[])
310 EC_KEY
*ec
= keydata
;
317 * In this implementation, we can export/import only keydata in the
318 * following combinations:
319 * - domain parameters only
320 * - public key with associated domain parameters (+optional other params)
321 * - private key with associated public key and domain parameters
322 * (+optional other params)
325 * - domain parameters must always be requested
326 * - private key must be requested alongside public key
327 * - other parameters must be requested only alongside a key
329 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) == 0)
331 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0
332 && (selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) == 0)
334 if ((selection
& OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS
) != 0
335 && (selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) == 0)
338 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
339 ok
= ok
&& ec_key_domparams_fromdata(ec
, params
);
340 if ((selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) != 0) {
341 int include_private
=
342 selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
? 1 : 0;
344 ok
= ok
&& ec_key_fromdata(ec
, params
, include_private
);
346 if ((selection
& OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS
) != 0)
347 ok
= ok
&& ec_key_otherparams_fromdata(ec
, params
);
353 int ec_export(void *keydata
, int selection
, OSSL_CALLBACK
*param_cb
,
356 EC_KEY
*ec
= keydata
;
357 OSSL_PARAM_BLD
*tmpl
;
358 OSSL_PARAM
*params
= NULL
;
359 unsigned char *pub_key
= NULL
;
366 * In this implementation, we can export/import only keydata in the
367 * following combinations:
368 * - domain parameters only
369 * - public key with associated domain parameters (+optional other params)
370 * - private key with associated public key and domain parameters
371 * (+optional other params)
374 * - domain parameters must always be requested
375 * - private key must be requested alongside public key
376 * - other parameters must be requested only alongside a key
378 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) == 0)
380 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0
381 && (selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) == 0)
383 if ((selection
& OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS
) != 0
384 && (selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) == 0)
387 tmpl
= OSSL_PARAM_BLD_new();
391 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
392 ok
= ok
&& domparams_to_params(ec
, tmpl
, NULL
);
394 if ((selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) != 0) {
395 int include_private
=
396 selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
? 1 : 0;
398 ok
= ok
&& key_to_params(ec
, tmpl
, NULL
, include_private
, &pub_key
);
400 if ((selection
& OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS
) != 0)
401 ok
= ok
&& otherparams_to_params(ec
, tmpl
, NULL
);
403 if (ok
&& (params
= OSSL_PARAM_BLD_to_param(tmpl
)) != NULL
)
404 ok
= param_cb(params
, cbarg
);
406 OSSL_PARAM_BLD_free_params(params
);
407 OSSL_PARAM_BLD_free(tmpl
);
408 OPENSSL_free(pub_key
);
412 /* IMEXPORT = IMPORT + EXPORT */
414 # define EC_IMEXPORTABLE_DOM_PARAMETERS \
415 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0)
416 # define EC_IMEXPORTABLE_PUBLIC_KEY \
417 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
418 # define EC_IMEXPORTABLE_PRIVATE_KEY \
419 OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
420 # define EC_IMEXPORTABLE_OTHER_PARAMETERS \
421 OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL)
424 * Include all the possible combinations of OSSL_PARAM arrays for
425 * ec_imexport_types().
427 * They are in a separate file as it is ~100 lines of unreadable and
428 * uninteresting machine generated stuff.
430 * TODO(3.0): the generated list looks quite ugly, as to cover all possible
431 * combinations of the bits in `selection`, it also includes combinations that
432 * are not really useful: we might want to consider alternatives to this
435 #include "ec_kmgmt_imexport.inc"
438 const OSSL_PARAM
*ec_imexport_types(int selection
)
442 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0)
444 if ((selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) != 0)
446 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
448 if ((selection
& OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS
) != 0)
450 return ec_types
[type_select
];
454 const OSSL_PARAM
*ec_import_types(int selection
)
456 return ec_imexport_types(selection
);
460 const OSSL_PARAM
*ec_export_types(int selection
)
462 return ec_imexport_types(selection
);
466 int ec_get_params(void *key
, OSSL_PARAM params
[])
470 const EC_GROUP
*ecg
= NULL
;
472 unsigned char *pub_key
= NULL
;
474 ecg
= EC_KEY_get0_group(eck
);
478 if ((p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_MAX_SIZE
)) != NULL
479 && !OSSL_PARAM_set_int(p
, ECDSA_size(eck
)))
481 if ((p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_BITS
)) != NULL
482 && !OSSL_PARAM_set_int(p
, EC_GROUP_order_bits(ecg
)))
484 if ((p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_SECURITY_BITS
)) != NULL
) {
485 int ecbits
, sec_bits
;
487 ecbits
= EC_GROUP_order_bits(ecg
);
490 * The following estimates are based on the values published
491 * in Table 2 of "NIST Special Publication 800-57 Part 1 Revision 4"
492 * at http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4 .
494 * Note that the above reference explicitly categorizes algorithms in a
495 * discrete set of values {80, 112, 128, 192, 256}, and that it is
496 * relevant only for NIST approved Elliptic Curves, while OpenSSL
497 * applies the same logic also to other curves.
499 * Classifications produced by other standardazing bodies might differ,
500 * so the results provided for "bits of security" by this provider are
501 * to be considered merely indicative, and it is the users'
502 * responsibility to compare these values against the normative
503 * references that may be relevant for their intent and purposes.
507 else if (ecbits
>= 384)
509 else if (ecbits
>= 256)
511 else if (ecbits
>= 224)
513 else if (ecbits
>= 160)
516 sec_bits
= ecbits
/ 2;
518 if (!OSSL_PARAM_set_int(p
, sec_bits
))
522 if ((p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_DEFAULT_DIGEST
)) != NULL
523 && !OSSL_PARAM_set_utf8_string(p
, EC_DEFAULT_MD
))
526 p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH
);
528 int ecdh_cofactor_mode
= 0;
531 (EC_KEY_get_flags(eck
) & EC_FLAG_COFACTOR_ECDH
) ? 1 : 0;
533 if (!OSSL_PARAM_set_int(p
, ecdh_cofactor_mode
))
536 if ((p
= OSSL_PARAM_locate(params
, OSSL_PKEY_PARAM_TLS_ENCODED_PT
)) != NULL
) {
537 BN_CTX
*ctx
= BN_CTX_new_ex(ec_key_get_libctx(key
));
541 p
->return_size
= EC_POINT_point2oct(EC_KEY_get0_group(key
),
542 EC_KEY_get0_public_key(key
),
543 POINT_CONVERSION_UNCOMPRESSED
,
544 p
->data
, p
->return_size
, ctx
);
546 if (p
->return_size
== 0)
550 ret
= domparams_to_params(eck
, NULL
, params
)
551 && key_to_params(eck
, NULL
, params
, 1, &pub_key
)
552 && otherparams_to_params(eck
, NULL
, params
);
553 OPENSSL_free(pub_key
);
557 static const OSSL_PARAM ec_known_gettable_params
[] = {
558 OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS
, NULL
),
559 OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS
, NULL
),
560 OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE
, NULL
),
561 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT
, NULL
, 0),
562 EC_IMEXPORTABLE_DOM_PARAMETERS
,
563 EC_IMEXPORTABLE_PUBLIC_KEY
,
564 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_X
, NULL
, 0),
565 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_Y
, NULL
, 0),
566 EC_IMEXPORTABLE_PRIVATE_KEY
,
567 EC_IMEXPORTABLE_OTHER_PARAMETERS
,
572 const OSSL_PARAM
*ec_gettable_params(void)
574 return ec_known_gettable_params
;
577 static const OSSL_PARAM ec_known_settable_params
[] = {
578 OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH
, NULL
),
579 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT
, NULL
, 0),
584 const OSSL_PARAM
*ec_settable_params(void)
586 return ec_known_settable_params
;
590 int ec_set_params(void *key
, const OSSL_PARAM params
[])
595 p
= OSSL_PARAM_locate_const(params
, OSSL_PKEY_PARAM_TLS_ENCODED_PT
);
597 BN_CTX
*ctx
= BN_CTX_new_ex(ec_key_get_libctx(key
));
601 || p
->data_type
!= OSSL_PARAM_OCTET_STRING
602 || !EC_KEY_oct2key(key
, p
->data
, p
->data_size
, ctx
))
609 return ec_key_otherparams_fromdata(eck
, params
);
613 int ec_validate(void *keydata
, int selection
)
615 EC_KEY
*eck
= keydata
;
617 BN_CTX
*ctx
= BN_CTX_new_ex(ec_key_get_libctx(eck
));
622 if ((selection
& EC_POSSIBLE_SELECTIONS
) != 0)
625 if ((selection
& OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
) != 0)
626 ok
= ok
&& EC_GROUP_check(EC_KEY_get0_group(eck
), ctx
);
628 if ((selection
& OSSL_KEYMGMT_SELECT_PUBLIC_KEY
) != 0)
629 ok
= ok
&& ec_key_public_check(eck
, ctx
);
631 if ((selection
& OSSL_KEYMGMT_SELECT_PRIVATE_KEY
) != 0)
632 ok
= ok
&& ec_key_private_check(eck
);
634 if ((selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) == OSSL_KEYMGMT_SELECT_KEYPAIR
)
635 ok
= ok
&& ec_key_pairwise_check(eck
, ctx
);
648 static void *ec_gen_init(void *provctx
, int selection
)
650 OPENSSL_CTX
*libctx
= PROV_LIBRARY_CONTEXT_OF(provctx
);
651 struct ec_gen_ctx
*gctx
= NULL
;
653 if ((selection
& (EC_POSSIBLE_SELECTIONS
)) == 0)
656 if ((gctx
= OPENSSL_zalloc(sizeof(*gctx
))) != NULL
) {
657 gctx
->libctx
= libctx
;
658 gctx
->gen_group
= NULL
;
659 gctx
->selection
= selection
;
665 static int ec_gen_set_group(void *genctx
, int nid
)
667 struct ec_gen_ctx
*gctx
= genctx
;
670 group
= EC_GROUP_new_by_curve_name_with_libctx(gctx
->libctx
, NULL
, nid
);
672 ERR_raise(ERR_LIB_PROV
, PROV_R_INVALID_CURVE
);
675 EC_GROUP_free(gctx
->gen_group
);
676 gctx
->gen_group
= group
;
679 static int ec_gen_set_template(void *genctx
, void *templ
)
681 struct ec_gen_ctx
*gctx
= genctx
;
683 const EC_GROUP
*ec_group
;
685 if (gctx
== NULL
|| ec
== NULL
)
687 if ((ec_group
= EC_KEY_get0_group(ec
)) == NULL
)
689 return ec_gen_set_group(gctx
, EC_GROUP_get_curve_name(ec_group
));
692 static int ec_gen_set_params(void *genctx
, const OSSL_PARAM params
[])
694 struct ec_gen_ctx
*gctx
= genctx
;
697 if ((p
= OSSL_PARAM_locate_const(params
, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH
))
699 if (!OSSL_PARAM_get_int(p
, &gctx
->ecdh_mode
))
702 if ((p
= OSSL_PARAM_locate_const(params
, OSSL_PKEY_PARAM_GROUP_NAME
))
704 const char *curve_name
= NULL
;
707 switch (p
->data_type
) {
708 case OSSL_PARAM_UTF8_STRING
:
709 /* The OSSL_PARAM functions have no support for this */
710 curve_name
= p
->data
;
711 ret
= (curve_name
!= NULL
);
713 case OSSL_PARAM_UTF8_PTR
:
714 ret
= OSSL_PARAM_get_utf8_ptr(p
, &curve_name
);
719 int nid
= ec_curve_name2nid(curve_name
);
721 if (nid
== NID_undef
) {
722 ERR_raise(ERR_LIB_PROV
, PROV_R_INVALID_CURVE
);
725 ret
= ec_gen_set_group(gctx
, nid
);
733 static const OSSL_PARAM
*ec_gen_settable_params(void *provctx
)
735 static OSSL_PARAM settable
[] = {
736 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME
, NULL
, 0),
737 OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH
, NULL
),
744 static int ec_gen_assign_group(EC_KEY
*ec
, EC_GROUP
*group
)
747 ERR_raise(ERR_LIB_PROV
, PROV_R_NO_PARAMETERS_SET
);
750 return EC_KEY_set_group(ec
, group
) > 0;
754 * The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
756 static void *ec_gen(void *genctx
, OSSL_CALLBACK
*osslcb
, void *cbarg
)
758 struct ec_gen_ctx
*gctx
= genctx
;
760 int ret
= 1; /* Start optimistically */
763 || (ec
= EC_KEY_new_with_libctx(gctx
->libctx
, NULL
)) == NULL
)
766 /* We must always assign a group, no matter what */
767 ret
= ec_gen_assign_group(ec
, gctx
->gen_group
);
768 /* Whether you want it or not, you get a keypair, not just one half */
769 if ((gctx
->selection
& OSSL_KEYMGMT_SELECT_KEYPAIR
) != 0)
770 ret
= ret
&& EC_KEY_generate_key(ec
);
772 if (gctx
->ecdh_mode
!= -1)
773 ret
= ret
&& ec_set_ecdh_cofactor_mode(ec
, gctx
->ecdh_mode
);
778 /* Something went wrong, throw the key away */
783 static void ec_gen_cleanup(void *genctx
)
785 struct ec_gen_ctx
*gctx
= genctx
;
790 EC_GROUP_free(gctx
->gen_group
);
794 const OSSL_DISPATCH ec_keymgmt_functions
[] = {
795 { OSSL_FUNC_KEYMGMT_NEW
, (void (*)(void))ec_newdata
},
796 { OSSL_FUNC_KEYMGMT_GEN_INIT
, (void (*)(void))ec_gen_init
},
797 { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE
,
798 (void (*)(void))ec_gen_set_template
},
799 { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS
, (void (*)(void))ec_gen_set_params
},
800 { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS
,
801 (void (*)(void))ec_gen_settable_params
},
802 { OSSL_FUNC_KEYMGMT_GEN
, (void (*)(void))ec_gen
},
803 { OSSL_FUNC_KEYMGMT_GEN_CLEANUP
, (void (*)(void))ec_gen_cleanup
},
804 { OSSL_FUNC_KEYMGMT_FREE
, (void (*)(void))ec_freedata
},
805 { OSSL_FUNC_KEYMGMT_GET_PARAMS
, (void (*) (void))ec_get_params
},
806 { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS
, (void (*) (void))ec_gettable_params
},
807 { OSSL_FUNC_KEYMGMT_SET_PARAMS
, (void (*) (void))ec_set_params
},
808 { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS
, (void (*) (void))ec_settable_params
},
809 { OSSL_FUNC_KEYMGMT_HAS
, (void (*)(void))ec_has
},
810 { OSSL_FUNC_KEYMGMT_MATCH
, (void (*)(void))ec_match
},
811 { OSSL_FUNC_KEYMGMT_VALIDATE
, (void (*)(void))ec_validate
},
812 { OSSL_FUNC_KEYMGMT_IMPORT
, (void (*)(void))ec_import
},
813 { OSSL_FUNC_KEYMGMT_IMPORT_TYPES
, (void (*)(void))ec_import_types
},
814 { OSSL_FUNC_KEYMGMT_EXPORT
, (void (*)(void))ec_export
},
815 { OSSL_FUNC_KEYMGMT_EXPORT_TYPES
, (void (*)(void))ec_export_types
},
816 { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME
,
817 (void (*)(void))ec_query_operation_name
},