crypto/encode_decode/encoder_meth.c

   1 /*
   2  * Copyright 2019-2022 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/core.h>
  11 #include <openssl/core_dispatch.h>
  12 #include <openssl/encoder.h>
  13 #include <openssl/ui.h>
  14 #include "internal/core.h"
  15 #include "internal/namemap.h"
  16 #include "internal/property.h"
  17 #include "internal/provider.h"
  18 #include "crypto/encoder.h"
  19 #include "encoder_local.h"
  20 #include "crypto/context.h"
  21
  22 /*
  23  * Encoder can have multiple names, separated with colons in a name string
  24  */
  25 #define NAME_SEPARATOR ':'
  26
  27 /* Simple method structure constructor and destructor */
  28 static OSSL_ENCODER *ossl_encoder_new(void)
  29 {
  30     OSSL_ENCODER *encoder = NULL;
  31
  32     if ((encoder = OPENSSL_zalloc(sizeof(*encoder))) == NULL
  33         || (encoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
  34         OSSL_ENCODER_free(encoder);
  35         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
  36         return NULL;
  37     }
  38
  39     encoder->base.refcnt = 1;
  40
  41     return encoder;
  42 }
  43
  44 int OSSL_ENCODER_up_ref(OSSL_ENCODER *encoder)
  45 {
  46     int ref = 0;
  47
  48     CRYPTO_UP_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
  49     return 1;
  50 }
  51
  52 void OSSL_ENCODER_free(OSSL_ENCODER *encoder)
  53 {
  54     int ref = 0;
  55
  56     if (encoder == NULL)
  57         return;
  58
  59     CRYPTO_DOWN_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
  60     if (ref > 0)
  61         return;
  62     OPENSSL_free(encoder->base.name);
  63     ossl_property_free(encoder->base.parsed_propdef);
  64     ossl_provider_free(encoder->base.prov);
  65     CRYPTO_THREAD_lock_free(encoder->base.lock);
  66     OPENSSL_free(encoder);
  67 }
  68
  69 /* Data to be passed through ossl_method_construct() */
  70 struct encoder_data_st {
  71     OSSL_LIB_CTX *libctx;
  72     int id;                      /* For get_encoder_from_store() */
  73     const char *names;           /* For get_encoder_from_store() */
  74     const char *propquery;       /* For get_encoder_from_store() */
  75
  76     OSSL_METHOD_STORE *tmp_store; /* For get_tmp_encoder_store() */
  77
  78     unsigned int flag_construct_error_occurred : 1;
  79 };
  80
  81 /*
  82  * Generic routines to fetch / create ENCODER methods with
  83  * ossl_method_construct()
  84  */
  85
  86 /* Temporary encoder method store, constructor and destructor */
  87 static void *get_tmp_encoder_store(void *data)
  88 {
  89     struct encoder_data_st *methdata = data;
  90
  91     if (methdata->tmp_store == NULL)
  92         methdata->tmp_store = ossl_method_store_new(methdata->libctx);
  93     return methdata->tmp_store;
  94 }
  95
  96 static void dealloc_tmp_encoder_store(void *store)
  97 {
  98     if (store != NULL)
  99         ossl_method_store_free(store);
 100 }
 101
 102 /* Get the permanent encoder store */
 103 static OSSL_METHOD_STORE *get_encoder_store(OSSL_LIB_CTX *libctx)
 104 {
 105     return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_ENCODER_STORE_INDEX);
 106 }
 107
 108 static int reserve_encoder_store(void *store, void *data)
 109 {
 110     struct encoder_data_st *methdata = data;
 111
 112     if (store == NULL
 113         && (store = get_encoder_store(methdata->libctx)) == NULL)
 114         return 0;
 115
 116     return ossl_method_lock_store(store);
 117 }
 118
 119 static int unreserve_encoder_store(void *store, void *data)
 120 {
 121     struct encoder_data_st *methdata = data;
 122
 123     if (store == NULL
 124         && (store = get_encoder_store(methdata->libctx)) == NULL)
 125         return 0;
 126
 127     return ossl_method_unlock_store(store);
 128 }
 129
 130 /* Get encoder methods from a store, or put one in */
 131 static void *get_encoder_from_store(void *store, const OSSL_PROVIDER **prov,
 132                                     void *data)
 133 {
 134     struct encoder_data_st *methdata = data;
 135     void *method = NULL;
 136     int id;
 137
 138     /*
 139      * get_encoder_from_store() is only called to try and get the method
 140      * that OSSL_ENCODER_fetch() is asking for, and the name or name id are
 141      * passed via methdata.
 142      */
 143     if ((id = methdata->id) == 0 && methdata->names != NULL) {
 144         OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 145         const char *names = methdata->names;
 146         const char *q = strchr(names, NAME_SEPARATOR);
 147         size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
 148
 149         if (namemap == 0)
 150             return NULL;
 151         id = ossl_namemap_name2num_n(namemap, methdata->names, l);
 152     }
 153
 154     if (id == 0)
 155         return NULL;
 156
 157     if (store == NULL
 158         && (store = get_encoder_store(methdata->libctx)) == NULL)
 159         return NULL;
 160
 161     if (!ossl_method_store_fetch(store, id, methdata->propquery, prov, &method))
 162         return NULL;
 163     return method;
 164 }
 165
 166 static int put_encoder_in_store(void *store, void *method,
 167                                 const OSSL_PROVIDER *prov,
 168                                 const char *names, const char *propdef,
 169                                 void *data)
 170 {
 171     struct encoder_data_st *methdata = data;
 172     OSSL_NAMEMAP *namemap;
 173     int id;
 174     size_t l = 0;
 175
 176     /*
 177      * put_encoder_in_store() is only called with an OSSL_ENCODER method that
 178      * was successfully created by construct_encoder() below, which means that
 179      * all the names should already be stored in the namemap with the same
 180      * numeric identity, so just use the first to get that identity.
 181      */
 182     if (names != NULL) {
 183         const char *q = strchr(names, NAME_SEPARATOR);
 184
 185         l = (q == NULL ? strlen(names) : (size_t)(q - names));
 186     }
 187
 188     if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL
 189         || (id = ossl_namemap_name2num_n(namemap, names, l)) == 0)
 190         return 0;
 191
 192     if (store == NULL && (store = get_encoder_store(methdata->libctx)) == NULL)
 193         return 0;
 194
 195     return ossl_method_store_add(store, prov, id, propdef, method,
 196                                  (int (*)(void *))OSSL_ENCODER_up_ref,
 197                                  (void (*)(void *))OSSL_ENCODER_free);
 198 }
 199
 200 /* Create and populate a encoder method */
 201 static void *encoder_from_algorithm(int id, const OSSL_ALGORITHM *algodef,
 202                                     OSSL_PROVIDER *prov)
 203 {
 204     OSSL_ENCODER *encoder = NULL;
 205     const OSSL_DISPATCH *fns = algodef->implementation;
 206     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 207
 208     if ((encoder = ossl_encoder_new()) == NULL)
 209         return NULL;
 210     encoder->base.id = id;
 211     if ((encoder->base.name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
 212         OSSL_ENCODER_free(encoder);
 213         return NULL;
 214     }
 215     encoder->base.algodef = algodef;
 216     if ((encoder->base.parsed_propdef
 217          = ossl_parse_property(libctx, algodef->property_definition)) == NULL) {
 218         OSSL_ENCODER_free(encoder);
 219         return NULL;
 220     }
 221
 222     for (; fns->function_id != 0; fns++) {
 223         switch (fns->function_id) {
 224         case OSSL_FUNC_ENCODER_NEWCTX:
 225             if (encoder->newctx == NULL)
 226                 encoder->newctx =
 227                     OSSL_FUNC_encoder_newctx(fns);
 228             break;
 229         case OSSL_FUNC_ENCODER_FREECTX:
 230             if (encoder->freectx == NULL)
 231                 encoder->freectx =
 232                     OSSL_FUNC_encoder_freectx(fns);
 233             break;
 234         case OSSL_FUNC_ENCODER_GET_PARAMS:
 235             if (encoder->get_params == NULL)
 236                 encoder->get_params =
 237                     OSSL_FUNC_encoder_get_params(fns);
 238             break;
 239         case OSSL_FUNC_ENCODER_GETTABLE_PARAMS:
 240             if (encoder->gettable_params == NULL)
 241                 encoder->gettable_params =
 242                     OSSL_FUNC_encoder_gettable_params(fns);
 243             break;
 244         case OSSL_FUNC_ENCODER_SET_CTX_PARAMS:
 245             if (encoder->set_ctx_params == NULL)
 246                 encoder->set_ctx_params =
 247                     OSSL_FUNC_encoder_set_ctx_params(fns);
 248             break;
 249         case OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS:
 250             if (encoder->settable_ctx_params == NULL)
 251                 encoder->settable_ctx_params =
 252                     OSSL_FUNC_encoder_settable_ctx_params(fns);
 253             break;
 254         case OSSL_FUNC_ENCODER_DOES_SELECTION:
 255             if (encoder->does_selection == NULL)
 256                 encoder->does_selection =
 257                     OSSL_FUNC_encoder_does_selection(fns);
 258             break;
 259         case OSSL_FUNC_ENCODER_ENCODE:
 260             if (encoder->encode == NULL)
 261                 encoder->encode = OSSL_FUNC_encoder_encode(fns);
 262             break;
 263         case OSSL_FUNC_ENCODER_IMPORT_OBJECT:
 264             if (encoder->import_object == NULL)
 265                 encoder->import_object =
 266                     OSSL_FUNC_encoder_import_object(fns);
 267             break;
 268         case OSSL_FUNC_ENCODER_FREE_OBJECT:
 269             if (encoder->free_object == NULL)
 270                 encoder->free_object =
 271                     OSSL_FUNC_encoder_free_object(fns);
 272             break;
 273         }
 274     }
 275     /*
 276      * Try to check that the method is sensible.
 277      * If you have a constructor, you must have a destructor and vice versa.
 278      * You must have the encoding driver functions.
 279      */
 280     if (!((encoder->newctx == NULL && encoder->freectx == NULL)
 281           || (encoder->newctx != NULL && encoder->freectx != NULL)
 282           || (encoder->import_object != NULL && encoder->free_object != NULL)
 283           || (encoder->import_object == NULL && encoder->free_object == NULL))
 284         || encoder->encode == NULL) {
 285         OSSL_ENCODER_free(encoder);
 286         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 287         return NULL;
 288     }
 289
 290     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 291         OSSL_ENCODER_free(encoder);
 292         return NULL;
 293     }
 294
 295     encoder->base.prov = prov;
 296     return encoder;
 297 }
 298
 299
 300 /*
 301  * The core fetching functionality passes the names of the implementation.
 302  * This function is responsible to getting an identity number for them,
 303  * then call encoder_from_algorithm() with that identity number.
 304  */
 305 static void *construct_encoder(const OSSL_ALGORITHM *algodef,
 306                                OSSL_PROVIDER *prov, void *data)
 307 {
 308     /*
 309      * This function is only called if get_encoder_from_store() returned
 310      * NULL, so it's safe to say that of all the spots to create a new
 311      * namemap entry, this is it.  Should the name already exist there, we
 312      * know that ossl_namemap_add() will return its corresponding number.
 313      */
 314     struct encoder_data_st *methdata = data;
 315     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 316     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 317     const char *names = algodef->algorithm_names;
 318     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 319     void *method = NULL;
 320
 321     if (id != 0)
 322         method = encoder_from_algorithm(id, algodef, prov);
 323
 324     /*
 325      * Flag to indicate that there was actual construction errors.  This
 326      * helps inner_evp_generic_fetch() determine what error it should
 327      * record on inaccessible algorithms.
 328      */
 329     if (method == NULL)
 330         methdata->flag_construct_error_occurred = 1;
 331
 332     return method;
 333 }
 334
 335 /* Intermediary function to avoid ugly casts, used below */
 336 static void destruct_encoder(void *method, void *data)
 337 {
 338     OSSL_ENCODER_free(method);
 339 }
 340
 341 static int up_ref_encoder(void *method)
 342 {
 343     return OSSL_ENCODER_up_ref(method);
 344 }
 345
 346 static void free_encoder(void *method)
 347 {
 348     OSSL_ENCODER_free(method);
 349 }
 350
 351 /* Fetching support.  Can fetch by numeric identity or by name */
 352 static OSSL_ENCODER *
 353 inner_ossl_encoder_fetch(struct encoder_data_st *methdata,
 354                          const char *name, const char *properties)
 355 {
 356     OSSL_METHOD_STORE *store = get_encoder_store(methdata->libctx);
 357     OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 358     const char *const propq = properties != NULL ? properties : "";
 359     void *method = NULL;
 360     int unsupported, id;
 361
 362     if (store == NULL || namemap == NULL) {
 363         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_INVALID_ARGUMENT);
 364         return NULL;
 365     }
 366
 367     id = name != NULL ? ossl_namemap_name2num(namemap, name) : 0;
 368
 369     /*
 370      * If we haven't found the name yet, chances are that the algorithm to
 371      * be fetched is unsupported.
 372      */
 373     unsupported = id == 0;
 374
 375     if (id == 0
 376         || !ossl_method_store_cache_get(store, NULL, id, propq, &method)) {
 377         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 378             get_tmp_encoder_store,
 379             reserve_encoder_store,
 380             unreserve_encoder_store,
 381             get_encoder_from_store,
 382             put_encoder_in_store,
 383             construct_encoder,
 384             destruct_encoder
 385         };
 386         OSSL_PROVIDER *prov = NULL;
 387
 388         methdata->id = id;
 389         methdata->names = name;
 390         methdata->propquery = propq;
 391         methdata->flag_construct_error_occurred = 0;
 392         if ((method = ossl_method_construct(methdata->libctx, OSSL_OP_ENCODER,
 393                                             &prov, 0 /* !force_cache */,
 394                                             &mcm, methdata)) != NULL) {
 395             /*
 396              * If construction did create a method for us, we know that
 397              * there is a correct name_id and meth_id, since those have
 398              * already been calculated in get_encoder_from_store() and
 399              * put_encoder_in_store() above.
 400              */
 401             if (id == 0)
 402                 id = ossl_namemap_name2num(namemap, name);
 403             ossl_method_store_cache_set(store, prov, id, propq, method,
 404                                         up_ref_encoder, free_encoder);
 405         }
 406
 407         /*
 408          * If we never were in the constructor, the algorithm to be fetched
 409          * is unsupported.
 410          */
 411         unsupported = !methdata->flag_construct_error_occurred;
 412     }
 413
 414     if ((id != 0 || name != NULL) && method == NULL) {
 415         int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;
 416
 417         if (name == NULL)
 418             name = ossl_namemap_num2name(namemap, id, 0);
 419         ERR_raise_data(ERR_LIB_OSSL_ENCODER, code,
 420                        "%s, Name (%s : %d), Properties (%s)",
 421                        ossl_lib_ctx_get_descriptor(methdata->libctx),
 422                        name == NULL ? "<null>" : name, id,
 423                        properties == NULL ? "<null>" : properties);
 424     }
 425
 426     return method;
 427 }
 428
 429 OSSL_ENCODER *OSSL_ENCODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
 430                                  const char *properties)
 431 {
 432     struct encoder_data_st methdata;
 433     void *method;
 434
 435     methdata.libctx = libctx;
 436     methdata.tmp_store = NULL;
 437     method = inner_ossl_encoder_fetch(&methdata, name, properties);
 438     dealloc_tmp_encoder_store(methdata.tmp_store);
 439     return method;
 440 }
 441
 442 int ossl_encoder_store_cache_flush(OSSL_LIB_CTX *libctx)
 443 {
 444     OSSL_METHOD_STORE *store = get_encoder_store(libctx);
 445
 446     if (store != NULL)
 447         return ossl_method_store_cache_flush_all(store);
 448     return 1;
 449 }
 450
 451 int ossl_encoder_store_remove_all_provided(const OSSL_PROVIDER *prov)
 452 {
 453     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 454     OSSL_METHOD_STORE *store = get_encoder_store(libctx);
 455
 456     if (store != NULL)
 457         return ossl_method_store_remove_all_provided(store, prov);
 458     return 1;
 459 }
 460
 461 /*
 462  * Library of basic method functions
 463  */
 464
 465 const OSSL_PROVIDER *OSSL_ENCODER_get0_provider(const OSSL_ENCODER *encoder)
 466 {
 467     if (!ossl_assert(encoder != NULL)) {
 468         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 469         return 0;
 470     }
 471
 472     return encoder->base.prov;
 473 }
 474
 475 const char *OSSL_ENCODER_get0_properties(const OSSL_ENCODER *encoder)
 476 {
 477     if (!ossl_assert(encoder != NULL)) {
 478         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 479         return 0;
 480     }
 481
 482     return encoder->base.algodef->property_definition;
 483 }
 484
 485 const OSSL_PROPERTY_LIST *
 486 ossl_encoder_parsed_properties(const OSSL_ENCODER *encoder)
 487 {
 488     if (!ossl_assert(encoder != NULL)) {
 489         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 490         return 0;
 491     }
 492
 493     return encoder->base.parsed_propdef;
 494 }
 495
 496 int ossl_encoder_get_number(const OSSL_ENCODER *encoder)
 497 {
 498     if (!ossl_assert(encoder != NULL)) {
 499         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 500         return 0;
 501     }
 502
 503     return encoder->base.id;
 504 }
 505
 506 const char *OSSL_ENCODER_get0_name(const OSSL_ENCODER *encoder)
 507 {
 508     return encoder->base.name;
 509 }
 510
 511 const char *OSSL_ENCODER_get0_description(const OSSL_ENCODER *encoder)
 512 {
 513     return encoder->base.algodef->algorithm_description;
 514 }
 515
 516 int OSSL_ENCODER_is_a(const OSSL_ENCODER *encoder, const char *name)
 517 {
 518     if (encoder->base.prov != NULL) {
 519         OSSL_LIB_CTX *libctx = ossl_provider_libctx(encoder->base.prov);
 520         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 521
 522         return ossl_namemap_name2num(namemap, name) == encoder->base.id;
 523     }
 524     return 0;
 525 }
 526
 527 struct do_one_data_st {
 528     void (*user_fn)(OSSL_ENCODER *encoder, void *arg);
 529     void *user_arg;
 530 };
 531
 532 static void do_one(ossl_unused int id, void *method, void *arg)
 533 {
 534     struct do_one_data_st *data = arg;
 535
 536     data->user_fn(method, data->user_arg);
 537 }
 538
 539 void OSSL_ENCODER_do_all_provided(OSSL_LIB_CTX *libctx,
 540                                   void (*user_fn)(OSSL_ENCODER *encoder,
 541                                                   void *arg),
 542                                   void *user_arg)
 543 {
 544     struct encoder_data_st methdata;
 545     struct do_one_data_st data;
 546
 547     methdata.libctx = libctx;
 548     methdata.tmp_store = NULL;
 549     (void)inner_ossl_encoder_fetch(&methdata, NULL, NULL /* properties */);
 550
 551     data.user_fn = user_fn;
 552     data.user_arg = user_arg;
 553     if (methdata.tmp_store != NULL)
 554         ossl_method_store_do_all(methdata.tmp_store, &do_one, &data);
 555     ossl_method_store_do_all(get_encoder_store(libctx), &do_one, &data);
 556     dealloc_tmp_encoder_store(methdata.tmp_store);
 557 }
 558
 559 int OSSL_ENCODER_names_do_all(const OSSL_ENCODER *encoder,
 560                               void (*fn)(const char *name, void *data),
 561                               void *data)
 562 {
 563     if (encoder == NULL)
 564         return 0;
 565
 566     if (encoder->base.prov != NULL) {
 567         OSSL_LIB_CTX *libctx = ossl_provider_libctx(encoder->base.prov);
 568         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 569
 570         return ossl_namemap_doall_names(namemap, encoder->base.id, fn, data);
 571     }
 572
 573     return 1;
 574 }
 575
 576 const OSSL_PARAM *
 577 OSSL_ENCODER_gettable_params(OSSL_ENCODER *encoder)
 578 {
 579     if (encoder != NULL && encoder->gettable_params != NULL) {
 580         void *provctx = ossl_provider_ctx(OSSL_ENCODER_get0_provider(encoder));
 581
 582         return encoder->gettable_params(provctx);
 583     }
 584     return NULL;
 585 }
 586
 587 int OSSL_ENCODER_get_params(OSSL_ENCODER *encoder, OSSL_PARAM params[])
 588 {
 589     if (encoder != NULL && encoder->get_params != NULL)
 590         return encoder->get_params(params);
 591     return 0;
 592 }
 593
 594 const OSSL_PARAM *OSSL_ENCODER_settable_ctx_params(OSSL_ENCODER *encoder)
 595 {
 596     if (encoder != NULL && encoder->settable_ctx_params != NULL) {
 597         void *provctx = ossl_provider_ctx(OSSL_ENCODER_get0_provider(encoder));
 598
 599         return encoder->settable_ctx_params(provctx);
 600     }
 601     return NULL;
 602 }
 603
 604 /*
 605  * Encoder context support
 606  */
 607
 608 OSSL_ENCODER_CTX *OSSL_ENCODER_CTX_new(void)
 609 {
 610     OSSL_ENCODER_CTX *ctx;
 611
 612     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
 613         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
 614
 615     return ctx;
 616 }
 617
 618 int OSSL_ENCODER_CTX_set_params(OSSL_ENCODER_CTX *ctx,
 619                                 const OSSL_PARAM params[])
 620 {
 621     int ok = 1;
 622     size_t i;
 623     size_t l;
 624
 625     if (!ossl_assert(ctx != NULL)) {
 626         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 627         return 0;
 628     }
 629
 630     if (ctx->encoder_insts == NULL)
 631         return 1;
 632
 633     l = OSSL_ENCODER_CTX_get_num_encoders(ctx);
 634     for (i = 0; i < l; i++) {
 635         OSSL_ENCODER_INSTANCE *encoder_inst =
 636             sk_OSSL_ENCODER_INSTANCE_value(ctx->encoder_insts, i);
 637         OSSL_ENCODER *encoder = OSSL_ENCODER_INSTANCE_get_encoder(encoder_inst);
 638         void *encoderctx = OSSL_ENCODER_INSTANCE_get_encoder_ctx(encoder_inst);
 639
 640         if (encoderctx == NULL || encoder->set_ctx_params == NULL)
 641             continue;
 642         if (!encoder->set_ctx_params(encoderctx, params))
 643             ok = 0;
 644     }
 645     return ok;
 646 }
 647
 648 void OSSL_ENCODER_CTX_free(OSSL_ENCODER_CTX *ctx)
 649 {
 650     if (ctx != NULL) {
 651         sk_OSSL_ENCODER_INSTANCE_pop_free(ctx->encoder_insts,
 652                                           ossl_encoder_instance_free);
 653         OPENSSL_free(ctx->construct_data);
 654         ossl_pw_clear_passphrase_data(&ctx->pwdata);
 655         OPENSSL_free(ctx);
 656     }
 657 }