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