providers/implementations/keymgmt/ec_kmgmt.c

   1 /*
   2  * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   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
   8  */
   9
  10 /*
  11  * ECDH/ECDSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/core_numbers.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/bn.h>
  19 #include <openssl/objects.h>
  20 #include <openssl/params.h>
  21 #include "crypto/bn.h"
  22 #include "crypto/ec.h"
  23 #include "internal/param_build.h"
  24 #include "prov/implementations.h"
  25 #include "prov/providercommon.h"
  26 #include "prov/provider_ctx.h"
  27
  28 static OSSL_OP_keymgmt_new_fn ec_newdata;
  29 static OSSL_OP_keymgmt_free_fn ec_freedata;
  30 static OSSL_OP_keymgmt_get_params_fn ec_get_params;
  31 static OSSL_OP_keymgmt_gettable_params_fn ec_gettable_params;
  32 static OSSL_OP_keymgmt_set_params_fn ec_set_params;
  33 static OSSL_OP_keymgmt_settable_params_fn ec_settable_params;
  34 static OSSL_OP_keymgmt_has_fn ec_has;
  35 static OSSL_OP_keymgmt_match_fn ec_match;
  36 static OSSL_OP_keymgmt_validate_fn ec_validate;
  37 static OSSL_OP_keymgmt_import_fn ec_import;
  38 static OSSL_OP_keymgmt_import_types_fn ec_import_types;
  39 static OSSL_OP_keymgmt_export_fn ec_export;
  40 static OSSL_OP_keymgmt_export_types_fn ec_export_types;
  41 static OSSL_OP_keymgmt_query_operation_name_fn ec_query_operation_name;
  42
  43 #define EC_POSSIBLE_SELECTIONS                 \
  44     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS )
  45
  46 static
  47 const char *ec_query_operation_name(int operation_id)
  48 {
  49     switch (operation_id) {
  50     case OSSL_OP_KEYEXCH:
  51         return "ECDH";
  52     case OSSL_OP_SIGNATURE:
  53         return "ECDSA";
  54     }
  55     return NULL;
  56 }
  57
  58 static ossl_inline
  59 int domparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl)
  60 {
  61     const EC_GROUP *ecg;
  62     int curve_nid;
  63
  64     if (ec == NULL)
  65         return 0;
  66
  67     ecg = EC_KEY_get0_group(ec);
  68     if (ecg == NULL)
  69         return 0;
  70
  71     curve_nid = EC_GROUP_get_curve_name(ecg);
  72
  73     if (curve_nid == NID_undef) {
  74         /* explicit parameters */
  75
  76         /*
  77          * TODO(3.0): should we support explicit parameters curves?
  78          */
  79         return 0;
  80     } else {
  81         /* named curve */
  82         const char *curve_name = NULL;
  83
  84         if ((curve_name = ec_curve_nid2name(curve_nid)) == NULL)
  85             return 0;
  86
  87         if (!ossl_param_bld_push_utf8_string(tmpl, OSSL_PKEY_PARAM_EC_NAME,
  88                                              curve_name, 0))
  89             return 0;
  90     }
  91
  92     return 1;
  93 }
  94
  95 /*
  96  * Callers of key_to_params MUST make sure that domparams_to_params is also
  97  * called!
  98  *
  99  * This function only exports the bare keypair, domain parameters and other
 100  * parameters are exported separately.
 101  */
 102 static ossl_inline
 103 int key_to_params(const EC_KEY *eckey, OSSL_PARAM_BLD *tmpl, int include_private)
 104 {
 105     const BIGNUM *priv_key = NULL;
 106     const EC_POINT *pub_point = NULL;
 107     const EC_GROUP *ecg = NULL;
 108     unsigned char *pub_key = NULL;
 109     size_t pub_key_len = 0;
 110     int ret = 0;
 111
 112     if (eckey == NULL)
 113         return 0;
 114
 115     ecg = EC_KEY_get0_group(eckey);
 116     priv_key = EC_KEY_get0_private_key(eckey);
 117     pub_point = EC_KEY_get0_public_key(eckey);
 118
 119     /* group and public_key must be present, priv_key is optional */
 120     if (ecg == NULL || pub_point == NULL)
 121         return 0;
 122     if ((pub_key_len = EC_POINT_point2buf(ecg, pub_point,
 123                                           POINT_CONVERSION_COMPRESSED,
 124                                           &pub_key, NULL)) == 0)
 125         return 0;
 126
 127     if (!ossl_param_bld_push_octet_string(tmpl,
 128                                           OSSL_PKEY_PARAM_PUB_KEY,
 129                                           pub_key, pub_key_len))
 130         goto err;
 131
 132     if (priv_key != NULL && include_private) {
 133         size_t sz;
 134         int ecbits;
 135
 136         /*
 137          * Key import/export should never leak the bit length of the secret
 138          * scalar in the key.
 139          *
 140          * For this reason, on export we use padded BIGNUMs with fixed length.
 141          *
 142          * When importing we also should make sure that, even if short lived,
 143          * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
 144          * soon as possible, so that any processing of this BIGNUM might opt for
 145          * constant time implementations in the backend.
 146          *
 147          * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
 148          * to preallocate the BIGNUM internal buffer to a fixed public size big
 149          * enough that operations performed during the processing never trigger
 150          * a realloc which would leak the size of the scalar through memory
 151          * accesses.
 152          *
 153          * Fixed Length
 154          * ------------
 155          *
 156          * The order of the large prime subgroup of the curve is our choice for
 157          * a fixed public size, as that is generally the upper bound for
 158          * generating a private key in EC cryptosystems and should fit all valid
 159          * secret scalars.
 160          *
 161          * For padding on export we just use the bit length of the order
 162          * converted to bytes (rounding up).
 163          *
 164          * For preallocating the BIGNUM storage we look at the number of "words"
 165          * required for the internal representation of the order, and we
 166          * preallocate 2 extra "words" in case any of the subsequent processing
 167          * might temporarily overflow the order length.
 168          */
 169         ecbits = EC_GROUP_order_bits(ecg);
 170         if (ecbits <= 0)
 171             goto err;
 172         sz = (ecbits + 7 ) / 8;
 173         if (!ossl_param_bld_push_BN_pad(tmpl,
 174                                         OSSL_PKEY_PARAM_PRIV_KEY,
 175                                         priv_key, sz))
 176             goto err;
 177     }
 178
 179     ret = 1;
 180
 181  err:
 182     OPENSSL_free(pub_key);
 183     return ret;
 184 }
 185
 186 static ossl_inline
 187 int otherparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl)
 188 {
 189     int ecdh_cofactor_mode = 0;
 190
 191     if (ec == NULL)
 192         return 0;
 193
 194     ecdh_cofactor_mode =
 195         (EC_KEY_get_flags(ec) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 196     if (!ossl_param_bld_push_int(tmpl,
 197                 OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
 198                 ecdh_cofactor_mode))
 199         return 0;
 200
 201     return 1;
 202 }
 203
 204 static
 205 void *ec_newdata(void *provctx)
 206 {
 207     return EC_KEY_new_ex(PROV_LIBRARY_CONTEXT_OF(provctx));
 208 }
 209
 210 static
 211 void ec_freedata(void *keydata)
 212 {
 213     EC_KEY_free(keydata);
 214 }
 215
 216 static
 217 int ec_has(void *keydata, int selection)
 218 {
 219     EC_KEY *ec = keydata;
 220     int ok = 0;
 221
 222     if (ec != NULL) {
 223         if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
 224             ok = 1;
 225
 226         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 227             ok = ok && (EC_KEY_get0_public_key(ec) != NULL);
 228         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 229             ok = ok && (EC_KEY_get0_private_key(ec) != NULL);
 230         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 231             ok = ok && (EC_KEY_get0_group(ec) != NULL);
 232         /*
 233          * We consider OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS to always be
 234          * available, so no extra check is needed other than the previous one
 235          * against EC_POSSIBLE_SELECTIONS.
 236          */
 237     }
 238     return ok;
 239 }
 240
 241 static int ec_match(const void *keydata1, const void *keydata2, int selection)
 242 {
 243     const EC_KEY *ec1 = keydata1;
 244     const EC_KEY *ec2 = keydata2;
 245     const EC_GROUP *group_a = EC_KEY_get0_group(ec1);
 246     const EC_GROUP *group_b = EC_KEY_get0_group(ec2);
 247     int ok = 1;
 248
 249     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 250         ok = ok && group_a != NULL && group_b != NULL
 251             && EC_GROUP_cmp(group_a, group_b, NULL) == 0;
 252     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
 253         const BIGNUM *pa = EC_KEY_get0_private_key(ec1);
 254         const BIGNUM *pb = EC_KEY_get0_private_key(ec2);
 255
 256         ok = ok && BN_cmp(pa, pb) == 0;
 257     }
 258     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 259         const EC_POINT *pa = EC_KEY_get0_public_key(ec1);
 260         const EC_POINT *pb = EC_KEY_get0_public_key(ec2);
 261
 262         ok = ok && EC_POINT_cmp(group_b, pa, pb, NULL);
 263     }
 264     return ok;
 265 }
 266
 267 static
 268 int ec_import(void *keydata, int selection, const OSSL_PARAM params[])
 269 {
 270     EC_KEY *ec = keydata;
 271     int ok = 1;
 272
 273     if (ec == NULL)
 274         return 0;
 275
 276     /*
 277      * In this implementation, we can export/import only keydata in the
 278      * following combinations:
 279      *   - domain parameters only
 280      *   - public key with associated domain parameters (+optional other params)
 281      *   - private key with associated public key and domain parameters
 282      *         (+optional other params)
 283      *
 284      * This means:
 285      *   - domain parameters must always be requested
 286      *   - private key must be requested alongside public key
 287      *   - other parameters must be requested only alongside a key
 288      */
 289     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 290         return 0;
 291     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
 292             && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
 293         return 0;
 294     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0
 295             && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
 296         return 0;
 297
 298     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 299         ok = ok && ec_key_domparams_fromdata(ec, params);
 300     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 301         int include_private =
 302             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 303
 304         ok = ok && ec_key_fromdata(ec, params, include_private);
 305     }
 306     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 307         ok = ok && ec_key_otherparams_fromdata(ec, params);
 308
 309     return ok;
 310 }
 311
 312 static
 313 int ec_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 314               void *cbarg)
 315 {
 316     EC_KEY *ec = keydata;
 317     OSSL_PARAM_BLD tmpl;
 318     OSSL_PARAM *params = NULL;
 319     int ok = 1;
 320
 321     if (ec == NULL)
 322         return 0;
 323
 324     /*
 325      * In this implementation, we can export/import only keydata in the
 326      * following combinations:
 327      *   - domain parameters only
 328      *   - public key with associated domain parameters (+optional other params)
 329      *   - private key with associated public key and domain parameters
 330      *         (+optional other params)
 331      *
 332      * This means:
 333      *   - domain parameters must always be requested
 334      *   - private key must be requested alongside public key
 335      *   - other parameters must be requested only alongside a key
 336      */
 337     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 338         return 0;
 339     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
 340             && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
 341         return 0;
 342     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0
 343             && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
 344         return 0;
 345
 346     ossl_param_bld_init(&tmpl);
 347
 348     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 349         ok = ok && domparams_to_params(ec, &tmpl);
 350     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 351         int include_private =
 352             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 353
 354         ok = ok && key_to_params(ec, &tmpl, include_private);
 355     }
 356     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 357         ok = ok && otherparams_to_params(ec, &tmpl);
 358
 359     if (!ok
 360         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 361         return 0;
 362
 363     ok = param_cb(params, cbarg);
 364     ossl_param_bld_free(params);
 365     return ok;
 366 }
 367
 368 /* IMEXPORT = IMPORT + EXPORT */
 369
 370 # define EC_IMEXPORTABLE_DOM_PARAMETERS                          \
 371     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_NAME, NULL, 0)
 372 # define EC_IMEXPORTABLE_PUBLIC_KEY                              \
 373     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 374 # define EC_IMEXPORTABLE_PRIVATE_KEY                             \
 375     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 376 # define EC_IMEXPORTABLE_OTHER_PARAMETERS                        \
 377     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL)
 378
 379 /*
 380  * Include all the possible combinations of OSSL_PARAM arrays for
 381  * ec_imexport_types().
 382  *
 383  * They are in a separate file as it is ~100 lines of unreadable and
 384  * uninteresting machine generated stuff.
 385  *
 386  * TODO(3.0): the generated list looks quite ugly, as to cover all possible
 387  * combinations of the bits in `selection`, it also includes combinations that
 388  * are not really useful: we might want to consider alternatives to this
 389  * solution.
 390  */
 391 #include "ec_kmgmt_imexport.inc"
 392
 393 static ossl_inline
 394 const OSSL_PARAM *ec_imexport_types(int selection)
 395 {
 396     int type_select = 0;
 397
 398     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 399         type_select += 1;
 400     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 401         type_select += 2;
 402     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 403         type_select += 4;
 404     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 405         type_select += 8;
 406     return ec_types[type_select];
 407 }
 408
 409 static
 410 const OSSL_PARAM *ec_import_types(int selection)
 411 {
 412     return ec_imexport_types(selection);
 413 }
 414
 415 static
 416 const OSSL_PARAM *ec_export_types(int selection)
 417 {
 418     return ec_imexport_types(selection);
 419 }
 420
 421 static
 422 int ec_get_params(void *key, OSSL_PARAM params[])
 423 {
 424     EC_KEY *eck = key;
 425     const EC_GROUP *ecg = NULL;
 426     OSSL_PARAM *p;
 427
 428     ecg = EC_KEY_get0_group(eck);
 429     if (ecg == NULL)
 430         return 0;
 431
 432     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 433         && !OSSL_PARAM_set_int(p, ECDSA_size(eck)))
 434         return 0;
 435     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 436         && !OSSL_PARAM_set_int(p, EC_GROUP_order_bits(ecg)))
 437         return 0;
 438     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL) {
 439         int ecbits, sec_bits;
 440
 441         ecbits = EC_GROUP_order_bits(ecg);
 442
 443         /*
 444          * The following estimates are based on the values published
 445          * in Table 2 of "NIST Special Publication 800-57 Part 1 Revision 4"
 446          * at http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4 .
 447          *
 448          * Note that the above reference explicitly categorizes algorithms in a
 449          * discrete set of values {80, 112, 128, 192, 256}, and that it is
 450          * relevant only for NIST approved Elliptic Curves, while OpenSSL
 451          * applies the same logic also to other curves.
 452          *
 453          * Classifications produced by other standardazing bodies might differ,
 454          * so the results provided for "bits of security" by this provider are
 455          * to be considered merely indicative, and it is the users'
 456          * responsibility to compare these values against the normative
 457          * references that may be relevant for their intent and purposes.
 458          */
 459         if (ecbits >= 512)
 460             sec_bits = 256;
 461         else if (ecbits >= 384)
 462             sec_bits = 192;
 463         else if (ecbits >= 256)
 464             sec_bits = 128;
 465         else if (ecbits >= 224)
 466             sec_bits = 112;
 467         else if (ecbits >= 160)
 468             sec_bits = 80;
 469         else
 470             sec_bits = ecbits / 2;
 471
 472         if (!OSSL_PARAM_set_int(p, sec_bits))
 473             return 0;
 474     }
 475
 476     p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
 477     if (p != NULL) {
 478         int ecdh_cofactor_mode = 0;
 479
 480         ecdh_cofactor_mode =
 481             (EC_KEY_get_flags(eck) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 482
 483         if (!OSSL_PARAM_set_int(p, ecdh_cofactor_mode))
 484             return 0;
 485     }
 486
 487     return 1;
 488 }
 489
 490 static const OSSL_PARAM ec_known_gettable_params[] = {
 491     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 492     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 493     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 494     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
 495     OSSL_PARAM_END
 496 };
 497
 498 static
 499 const OSSL_PARAM *ec_gettable_params(void)
 500 {
 501     return ec_known_gettable_params;
 502 }
 503
 504 static const OSSL_PARAM ec_known_settable_params[] = {
 505     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
 506     OSSL_PARAM_END
 507 };
 508
 509 static
 510 const OSSL_PARAM *ec_settable_params(void)
 511 {
 512     return ec_known_settable_params;
 513 }
 514
 515 static
 516 int ec_set_params(void *key, const OSSL_PARAM params[])
 517 {
 518     EC_KEY *eck = key;
 519     const OSSL_PARAM *p;
 520
 521     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
 522     if (p != NULL && !ec_set_param_ecdh_cofactor_mode(eck, p))
 523         return 0;
 524
 525     return 1;
 526 }
 527
 528 static
 529 int ec_validate(void *keydata, int selection)
 530 {
 531     EC_KEY *eck = keydata;
 532     int ok = 0;
 533     BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(eck));
 534
 535     if (ctx == NULL)
 536         return 0;
 537
 538     if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
 539         ok = 1;
 540
 541     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 542         ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
 543
 544     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 545         ok = ok && ec_key_public_check(eck, ctx);
 546
 547     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 548         ok = ok && ec_key_private_check(eck);
 549
 550     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
 551         ok = ok && ec_key_pairwise_check(eck, ctx);
 552
 553     BN_CTX_free(ctx);
 554     return ok;
 555 }
 556
 557 const OSSL_DISPATCH ec_keymgmt_functions[] = {
 558     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))ec_newdata },
 559     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
 560     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))ec_get_params },
 561     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))ec_gettable_params },
 562     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
 563     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))ec_settable_params },
 564     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
 565     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
 566     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))ec_validate },
 567     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))ec_import },
 568     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
 569     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
 570     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
 571     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
 572         (void (*)(void))ec_query_operation_name },
 573     { 0, NULL }
 574 };