crypto/evp/exchange.c

   1 /*
   2  * Copyright 2019-2023 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 #include <openssl/crypto.h>
  11 #include <openssl/evp.h>
  12 #include <openssl/err.h>
  13 #include "internal/cryptlib.h"
  14 #include "internal/refcount.h"
  15 #include "internal/provider.h"
  16 #include "internal/core.h"
  17 #include "internal/numbers.h"   /* includes SIZE_MAX */
  18 #include "crypto/evp.h"
  19 #include "evp_local.h"
  20
  21 static EVP_KEYEXCH *evp_keyexch_new(OSSL_PROVIDER *prov)
  22 {
  23     EVP_KEYEXCH *exchange = OPENSSL_zalloc(sizeof(EVP_KEYEXCH));
  24
  25     if (exchange == NULL)
  26         return NULL;
  27
  28     if (!CRYPTO_NEW_REF(&exchange->refcnt, 1)) {
  29         OPENSSL_free(exchange);
  30         return NULL;
  31     }
  32     exchange->prov = prov;
  33     ossl_provider_up_ref(prov);
  34
  35     return exchange;
  36 }
  37
  38 static void *evp_keyexch_from_algorithm(int name_id,
  39                                         const OSSL_ALGORITHM *algodef,
  40                                         OSSL_PROVIDER *prov)
  41 {
  42     const OSSL_DISPATCH *fns = algodef->implementation;
  43     EVP_KEYEXCH *exchange = NULL;
  44     int fncnt = 0, sparamfncnt = 0, gparamfncnt = 0;
  45
  46     if ((exchange = evp_keyexch_new(prov)) == NULL) {
  47         ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
  48         goto err;
  49     }
  50
  51     exchange->name_id = name_id;
  52     if ((exchange->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL)
  53         goto err;
  54     exchange->description = algodef->algorithm_description;
  55
  56     for (; fns->function_id != 0; fns++) {
  57         switch (fns->function_id) {
  58         case OSSL_FUNC_KEYEXCH_NEWCTX:
  59             if (exchange->newctx != NULL)
  60                 break;
  61             exchange->newctx = OSSL_FUNC_keyexch_newctx(fns);
  62             fncnt++;
  63             break;
  64         case OSSL_FUNC_KEYEXCH_INIT:
  65             if (exchange->init != NULL)
  66                 break;
  67             exchange->init = OSSL_FUNC_keyexch_init(fns);
  68             fncnt++;
  69             break;
  70         case OSSL_FUNC_KEYEXCH_SET_PEER:
  71             if (exchange->set_peer != NULL)
  72                 break;
  73             exchange->set_peer = OSSL_FUNC_keyexch_set_peer(fns);
  74             break;
  75         case OSSL_FUNC_KEYEXCH_DERIVE:
  76             if (exchange->derive != NULL)
  77                 break;
  78             exchange->derive = OSSL_FUNC_keyexch_derive(fns);
  79             fncnt++;
  80             break;
  81         case OSSL_FUNC_KEYEXCH_FREECTX:
  82             if (exchange->freectx != NULL)
  83                 break;
  84             exchange->freectx = OSSL_FUNC_keyexch_freectx(fns);
  85             fncnt++;
  86             break;
  87         case OSSL_FUNC_KEYEXCH_DUPCTX:
  88             if (exchange->dupctx != NULL)
  89                 break;
  90             exchange->dupctx = OSSL_FUNC_keyexch_dupctx(fns);
  91             break;
  92         case OSSL_FUNC_KEYEXCH_GET_CTX_PARAMS:
  93             if (exchange->get_ctx_params != NULL)
  94                 break;
  95             exchange->get_ctx_params = OSSL_FUNC_keyexch_get_ctx_params(fns);
  96             gparamfncnt++;
  97             break;
  98         case OSSL_FUNC_KEYEXCH_GETTABLE_CTX_PARAMS:
  99             if (exchange->gettable_ctx_params != NULL)
 100                 break;
 101             exchange->gettable_ctx_params
 102                 = OSSL_FUNC_keyexch_gettable_ctx_params(fns);
 103             gparamfncnt++;
 104             break;
 105         case OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS:
 106             if (exchange->set_ctx_params != NULL)
 107                 break;
 108             exchange->set_ctx_params = OSSL_FUNC_keyexch_set_ctx_params(fns);
 109             sparamfncnt++;
 110             break;
 111         case OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS:
 112             if (exchange->settable_ctx_params != NULL)
 113                 break;
 114             exchange->settable_ctx_params
 115                 = OSSL_FUNC_keyexch_settable_ctx_params(fns);
 116             sparamfncnt++;
 117             break;
 118         }
 119     }
 120     if (fncnt != 4
 121             || (gparamfncnt != 0 && gparamfncnt != 2)
 122             || (sparamfncnt != 0 && sparamfncnt != 2)) {
 123         /*
 124          * In order to be a consistent set of functions we must have at least
 125          * a complete set of "exchange" functions: init, derive, newctx,
 126          * and freectx. The set_ctx_params and settable_ctx_params functions are
 127          * optional, but if one of them is present then the other one must also
 128          * be present. Same goes for get_ctx_params and gettable_ctx_params.
 129          * The dupctx and set_peer functions are optional.
 130          */
 131         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 132         goto err;
 133     }
 134
 135     return exchange;
 136
 137  err:
 138     EVP_KEYEXCH_free(exchange);
 139     return NULL;
 140 }
 141
 142 void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange)
 143 {
 144     int i;
 145
 146     if (exchange == NULL)
 147         return;
 148     CRYPTO_DOWN_REF(&exchange->refcnt, &i);
 149     if (i > 0)
 150         return;
 151     OPENSSL_free(exchange->type_name);
 152     ossl_provider_free(exchange->prov);
 153     CRYPTO_FREE_REF(&exchange->refcnt);
 154     OPENSSL_free(exchange);
 155 }
 156
 157 int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange)
 158 {
 159     int ref = 0;
 160
 161     CRYPTO_UP_REF(&exchange->refcnt, &ref);
 162     return 1;
 163 }
 164
 165 OSSL_PROVIDER *EVP_KEYEXCH_get0_provider(const EVP_KEYEXCH *exchange)
 166 {
 167     return exchange->prov;
 168 }
 169
 170 EVP_KEYEXCH *EVP_KEYEXCH_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
 171                                const char *properties)
 172 {
 173     return evp_generic_fetch(ctx, OSSL_OP_KEYEXCH, algorithm, properties,
 174                              evp_keyexch_from_algorithm,
 175                              (int (*)(void *))EVP_KEYEXCH_up_ref,
 176                              (void (*)(void *))EVP_KEYEXCH_free);
 177 }
 178
 179 EVP_KEYEXCH *evp_keyexch_fetch_from_prov(OSSL_PROVIDER *prov,
 180                                          const char *algorithm,
 181                                          const char *properties)
 182 {
 183     return evp_generic_fetch_from_prov(prov, OSSL_OP_KEYEXCH,
 184                                        algorithm, properties,
 185                                        evp_keyexch_from_algorithm,
 186                                        (int (*)(void *))EVP_KEYEXCH_up_ref,
 187                                        (void (*)(void *))EVP_KEYEXCH_free);
 188 }
 189
 190 int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx)
 191 {
 192     return EVP_PKEY_derive_init_ex(ctx, NULL);
 193 }
 194
 195 int EVP_PKEY_derive_init_ex(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[])
 196 {
 197     int ret;
 198     void *provkey = NULL;
 199     EVP_KEYEXCH *exchange = NULL;
 200     EVP_KEYMGMT *tmp_keymgmt = NULL;
 201     const OSSL_PROVIDER *tmp_prov = NULL;
 202     const char *supported_exch = NULL;
 203     int iter;
 204
 205     if (ctx == NULL) {
 206         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 207         return -2;
 208     }
 209
 210     evp_pkey_ctx_free_old_ops(ctx);
 211     ctx->operation = EVP_PKEY_OP_DERIVE;
 212
 213     ERR_set_mark();
 214
 215     if (evp_pkey_ctx_is_legacy(ctx))
 216         goto legacy;
 217
 218     /*
 219      * Some algorithms (e.g. legacy KDFs) don't have a pkey - so we create
 220      * a blank one.
 221      */
 222     if (ctx->pkey == NULL) {
 223         EVP_PKEY *pkey = EVP_PKEY_new();
 224
 225         if (pkey == NULL
 226             || !EVP_PKEY_set_type_by_keymgmt(pkey, ctx->keymgmt)
 227             || (pkey->keydata = evp_keymgmt_newdata(ctx->keymgmt)) == NULL) {
 228             ERR_clear_last_mark();
 229             EVP_PKEY_free(pkey);
 230             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 231             goto err;
 232         }
 233         ctx->pkey = pkey;
 234     }
 235
 236     /*
 237      * Try to derive the supported exch from |ctx->keymgmt|.
 238      */
 239     if (!ossl_assert(ctx->pkey->keymgmt == NULL
 240                      || ctx->pkey->keymgmt == ctx->keymgmt)) {
 241         ERR_clear_last_mark();
 242         ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
 243         goto err;
 244     }
 245     supported_exch = evp_keymgmt_util_query_operation_name(ctx->keymgmt,
 246                                                            OSSL_OP_KEYEXCH);
 247     if (supported_exch == NULL) {
 248         ERR_clear_last_mark();
 249         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 250         goto err;
 251     }
 252
 253
 254     /*
 255      * We perform two iterations:
 256      *
 257      * 1.  Do the normal exchange fetch, using the fetching data given by
 258      *     the EVP_PKEY_CTX.
 259      * 2.  Do the provider specific exchange fetch, from the same provider
 260      *     as |ctx->keymgmt|
 261      *
 262      * We then try to fetch the keymgmt from the same provider as the
 263      * exchange, and try to export |ctx->pkey| to that keymgmt (when
 264      * this keymgmt happens to be the same as |ctx->keymgmt|, the export
 265      * is a no-op, but we call it anyway to not complicate the code even
 266      * more).
 267      * If the export call succeeds (returns a non-NULL provider key pointer),
 268      * we're done and can perform the operation itself.  If not, we perform
 269      * the second iteration, or jump to legacy.
 270      */
 271     for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) {
 272         EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
 273
 274         /*
 275          * If we're on the second iteration, free the results from the first.
 276          * They are NULL on the first iteration, so no need to check what
 277          * iteration we're on.
 278          */
 279         EVP_KEYEXCH_free(exchange);
 280         EVP_KEYMGMT_free(tmp_keymgmt);
 281
 282         switch (iter) {
 283         case 1:
 284             exchange =
 285                 EVP_KEYEXCH_fetch(ctx->libctx, supported_exch, ctx->propquery);
 286             if (exchange != NULL)
 287                 tmp_prov = EVP_KEYEXCH_get0_provider(exchange);
 288             break;
 289         case 2:
 290             tmp_prov = EVP_KEYMGMT_get0_provider(ctx->keymgmt);
 291             exchange =
 292                 evp_keyexch_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
 293                                               supported_exch, ctx->propquery);
 294             if (exchange == NULL)
 295                 goto legacy;
 296             break;
 297         }
 298         if (exchange == NULL)
 299             continue;
 300
 301         /*
 302          * Ensure that the key is provided, either natively, or as a cached
 303          * export.  We start by fetching the keymgmt with the same name as
 304          * |ctx->keymgmt|, but from the provider of the exchange method, using
 305          * the same property query as when fetching the exchange method.
 306          * With the keymgmt we found (if we did), we try to export |ctx->pkey|
 307          * to it (evp_pkey_export_to_provider() is smart enough to only actually
 308          * export it if |tmp_keymgmt| is different from |ctx->pkey|'s keymgmt)
 309          */
 310         tmp_keymgmt_tofree = tmp_keymgmt =
 311             evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
 312                                         EVP_KEYMGMT_get0_name(ctx->keymgmt),
 313                                         ctx->propquery);
 314         if (tmp_keymgmt != NULL)
 315             provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
 316                                                   &tmp_keymgmt, ctx->propquery);
 317         if (tmp_keymgmt == NULL)
 318             EVP_KEYMGMT_free(tmp_keymgmt_tofree);
 319     }
 320
 321     if (provkey == NULL) {
 322         EVP_KEYEXCH_free(exchange);
 323         goto legacy;
 324     }
 325
 326     ERR_pop_to_mark();
 327
 328     /* No more legacy from here down to legacy: */
 329
 330     /* A Coverity false positive with up_ref/down_ref and free */
 331     /* coverity[use_after_free] */
 332     ctx->op.kex.exchange = exchange;
 333     /* A Coverity false positive with up_ref/down_ref and free */
 334     /* coverity[deref_arg] */
 335     ctx->op.kex.algctx = exchange->newctx(ossl_provider_ctx(exchange->prov));
 336     if (ctx->op.kex.algctx == NULL) {
 337         /* The provider key can stay in the cache */
 338         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 339         goto err;
 340     }
 341     ret = exchange->init(ctx->op.kex.algctx, provkey, params);
 342
 343     EVP_KEYMGMT_free(tmp_keymgmt);
 344     return ret ? 1 : 0;
 345  err:
 346     evp_pkey_ctx_free_old_ops(ctx);
 347     ctx->operation = EVP_PKEY_OP_UNDEFINED;
 348     EVP_KEYMGMT_free(tmp_keymgmt);
 349     return 0;
 350
 351  legacy:
 352     /*
 353      * If we don't have the full support we need with provided methods,
 354      * let's go see if legacy does.
 355      */
 356     ERR_pop_to_mark();
 357
 358 #ifdef FIPS_MODULE
 359     return 0;
 360 #else
 361     if (ctx->pmeth == NULL || ctx->pmeth->derive == NULL) {
 362         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 363         return -2;
 364     }
 365
 366     if (ctx->pmeth->derive_init == NULL)
 367         return 1;
 368     ret = ctx->pmeth->derive_init(ctx);
 369     if (ret <= 0)
 370         ctx->operation = EVP_PKEY_OP_UNDEFINED;
 371     EVP_KEYMGMT_free(tmp_keymgmt);
 372     return ret;
 373 #endif
 374 }
 375
 376 int EVP_PKEY_derive_set_peer_ex(EVP_PKEY_CTX *ctx, EVP_PKEY *peer,
 377                                 int validate_peer)
 378 {
 379     int ret = 0, check;
 380     void *provkey = NULL;
 381     EVP_PKEY_CTX *check_ctx = NULL;
 382     EVP_KEYMGMT *tmp_keymgmt = NULL, *tmp_keymgmt_tofree = NULL;
 383
 384     if (ctx == NULL) {
 385         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 386         return -1;
 387     }
 388
 389     if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx) || ctx->op.kex.algctx == NULL)
 390         goto legacy;
 391
 392     if (ctx->op.kex.exchange->set_peer == NULL) {
 393         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 394         return -2;
 395     }
 396
 397     if (validate_peer) {
 398         check_ctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, peer, ctx->propquery);
 399         if (check_ctx == NULL)
 400             return -1;
 401         check = EVP_PKEY_public_check(check_ctx);
 402         EVP_PKEY_CTX_free(check_ctx);
 403         if (check <= 0)
 404             return -1;
 405     }
 406
 407     /*
 408      * Ensure that the |peer| is provided, either natively, or as a cached
 409      * export.  We start by fetching the keymgmt with the same name as
 410      * |ctx->keymgmt|, but from the provider of the exchange method, using
 411      * the same property query as when fetching the exchange method.
 412      * With the keymgmt we found (if we did), we try to export |peer|
 413      * to it (evp_pkey_export_to_provider() is smart enough to only actually
 414      * export it if |tmp_keymgmt| is different from |peer|'s keymgmt)
 415      */
 416     tmp_keymgmt_tofree = tmp_keymgmt =
 417         evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)
 418                                     EVP_KEYEXCH_get0_provider(ctx->op.kex.exchange),
 419                                     EVP_KEYMGMT_get0_name(ctx->keymgmt),
 420                                     ctx->propquery);
 421     if (tmp_keymgmt != NULL)
 422         /* A Coverity issue with up_ref/down_ref and free */
 423         /* coverity[pass_freed_arg] */
 424         provkey = evp_pkey_export_to_provider(peer, ctx->libctx,
 425                                               &tmp_keymgmt, ctx->propquery);
 426     EVP_KEYMGMT_free(tmp_keymgmt_tofree);
 427
 428     /*
 429      * If making the key provided wasn't possible, legacy may be able to pick
 430      * it up
 431      */
 432     if (provkey == NULL)
 433         goto legacy;
 434     return ctx->op.kex.exchange->set_peer(ctx->op.kex.algctx, provkey);
 435
 436  legacy:
 437 #ifdef FIPS_MODULE
 438     return ret;
 439 #else
 440     if (ctx->pmeth == NULL
 441         || !(ctx->pmeth->derive != NULL
 442              || ctx->pmeth->encrypt != NULL
 443              || ctx->pmeth->decrypt != NULL)
 444         || ctx->pmeth->ctrl == NULL) {
 445         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 446         return -2;
 447     }
 448     if (ctx->operation != EVP_PKEY_OP_DERIVE
 449         && ctx->operation != EVP_PKEY_OP_ENCRYPT
 450         && ctx->operation != EVP_PKEY_OP_DECRYPT) {
 451         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
 452         return -1;
 453     }
 454
 455     ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
 456
 457     if (ret <= 0)
 458         return ret;
 459
 460     if (ret == 2)
 461         return 1;
 462
 463     if (ctx->pkey == NULL) {
 464         ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
 465         return -1;
 466     }
 467
 468     if (ctx->pkey->type != peer->type) {
 469         ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
 470         return -1;
 471     }
 472
 473     /*
 474      * For clarity.  The error is if parameters in peer are
 475      * present (!missing) but don't match.  EVP_PKEY_parameters_eq may return
 476      * 1 (match), 0 (don't match) and -2 (comparison is not defined).  -1
 477      * (different key types) is impossible here because it is checked earlier.
 478      * -2 is OK for us here, as well as 1, so we can check for 0 only.
 479      */
 480     if (!EVP_PKEY_missing_parameters(peer) &&
 481         !EVP_PKEY_parameters_eq(ctx->pkey, peer)) {
 482         ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_PARAMETERS);
 483         return -1;
 484     }
 485
 486     EVP_PKEY_free(ctx->peerkey);
 487     ctx->peerkey = peer;
 488
 489     ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
 490
 491     if (ret <= 0) {
 492         ctx->peerkey = NULL;
 493         return ret;
 494     }
 495
 496     EVP_PKEY_up_ref(peer);
 497     return 1;
 498 #endif
 499 }
 500
 501 int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
 502 {
 503     return EVP_PKEY_derive_set_peer_ex(ctx, peer, 1);
 504 }
 505
 506 int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *pkeylen)
 507 {
 508     int ret;
 509
 510     if (ctx == NULL || pkeylen == NULL) {
 511         ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
 512         return -1;
 513     }
 514
 515     if (!EVP_PKEY_CTX_IS_DERIVE_OP(ctx)) {
 516         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_INITIALIZED);
 517         return -1;
 518     }
 519
 520     if (ctx->op.kex.algctx == NULL)
 521         goto legacy;
 522
 523     ret = ctx->op.kex.exchange->derive(ctx->op.kex.algctx, key, pkeylen,
 524                                        key != NULL ? *pkeylen : 0);
 525
 526     return ret;
 527  legacy:
 528     if (ctx->pmeth == NULL || ctx->pmeth->derive == NULL) {
 529         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 530         return -2;
 531     }
 532
 533     M_check_autoarg(ctx, key, pkeylen, EVP_F_EVP_PKEY_DERIVE)
 534         return ctx->pmeth->derive(ctx, key, pkeylen);
 535 }
 536
 537 int evp_keyexch_get_number(const EVP_KEYEXCH *keyexch)
 538 {
 539     return keyexch->name_id;
 540 }
 541
 542 const char *EVP_KEYEXCH_get0_name(const EVP_KEYEXCH *keyexch)
 543 {
 544     return keyexch->type_name;
 545 }
 546
 547 const char *EVP_KEYEXCH_get0_description(const EVP_KEYEXCH *keyexch)
 548 {
 549     return keyexch->description;
 550 }
 551
 552 int EVP_KEYEXCH_is_a(const EVP_KEYEXCH *keyexch, const char *name)
 553 {
 554     return keyexch != NULL
 555            && evp_is_a(keyexch->prov, keyexch->name_id, NULL, name);
 556 }
 557
 558 void EVP_KEYEXCH_do_all_provided(OSSL_LIB_CTX *libctx,
 559                                  void (*fn)(EVP_KEYEXCH *keyexch, void *arg),
 560                                  void *arg)
 561 {
 562     evp_generic_do_all(libctx, OSSL_OP_KEYEXCH,
 563                        (void (*)(void *, void *))fn, arg,
 564                        evp_keyexch_from_algorithm,
 565                        (int (*)(void *))EVP_KEYEXCH_up_ref,
 566                        (void (*)(void *))EVP_KEYEXCH_free);
 567 }
 568
 569 int EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *keyexch,
 570                              void (*fn)(const char *name, void *data),
 571                              void *data)
 572 {
 573     if (keyexch->prov != NULL)
 574         return evp_names_do_all(keyexch->prov, keyexch->name_id, fn, data);
 575
 576     return 1;
 577 }
 578
 579 const OSSL_PARAM *EVP_KEYEXCH_gettable_ctx_params(const EVP_KEYEXCH *keyexch)
 580 {
 581     void *provctx;
 582
 583     if (keyexch == NULL || keyexch->gettable_ctx_params == NULL)
 584         return NULL;
 585
 586     provctx = ossl_provider_ctx(EVP_KEYEXCH_get0_provider(keyexch));
 587     return keyexch->gettable_ctx_params(NULL, provctx);
 588 }
 589
 590 const OSSL_PARAM *EVP_KEYEXCH_settable_ctx_params(const EVP_KEYEXCH *keyexch)
 591 {
 592     void *provctx;
 593
 594     if (keyexch == NULL || keyexch->settable_ctx_params == NULL)
 595         return NULL;
 596     provctx = ossl_provider_ctx(EVP_KEYEXCH_get0_provider(keyexch));
 597     return keyexch->settable_ctx_params(NULL, provctx);
 598 }