crypto/encode_decode/decoder_meth.c

   1 /*
   2  * Copyright 2020-2021 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/decoder.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/decoder.h"
  19 #include "encoder_local.h"
  20
  21 /*
  22  * Decoder can have multiple names, separated with colons in a name string
  23  */
  24 #define NAME_SEPARATOR ':'
  25
  26 /* Simple method structure constructor and destructor */
  27 static OSSL_DECODER *ossl_decoder_new(void)
  28 {
  29     OSSL_DECODER *decoder = NULL;
  30
  31     if ((decoder = OPENSSL_zalloc(sizeof(*decoder))) == NULL
  32         || (decoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
  33         OSSL_DECODER_free(decoder);
  34         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
  35         return NULL;
  36     }
  37
  38     decoder->base.refcnt = 1;
  39
  40     return decoder;
  41 }
  42
  43 int OSSL_DECODER_up_ref(OSSL_DECODER *decoder)
  44 {
  45     int ref = 0;
  46
  47     CRYPTO_UP_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
  48     return 1;
  49 }
  50
  51 void OSSL_DECODER_free(OSSL_DECODER *decoder)
  52 {
  53     int ref = 0;
  54
  55     if (decoder == NULL)
  56         return;
  57
  58     CRYPTO_DOWN_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
  59     if (ref > 0)
  60         return;
  61     OPENSSL_free(decoder->base.name);
  62     ossl_property_free(decoder->base.parsed_propdef);
  63     ossl_provider_free(decoder->base.prov);
  64     CRYPTO_THREAD_lock_free(decoder->base.lock);
  65     OPENSSL_free(decoder);
  66 }
  67
  68 /* Permanent decoder method store, constructor and destructor */
  69 static void decoder_store_free(void *vstore)
  70 {
  71     ossl_method_store_free(vstore);
  72 }
  73
  74 static void *decoder_store_new(OSSL_LIB_CTX *ctx)
  75 {
  76     return ossl_method_store_new(ctx);
  77 }
  78
  79
  80 static const OSSL_LIB_CTX_METHOD decoder_store_method = {
  81     /* We want decoder_store to be cleaned up before the provider store */
  82     OSSL_LIB_CTX_METHOD_PRIORITY_2,
  83     decoder_store_new,
  84     decoder_store_free,
  85 };
  86
  87 /* Data to be passed through ossl_method_construct() */
  88 struct decoder_data_st {
  89     OSSL_LIB_CTX *libctx;
  90     int id;                      /* For get_decoder_from_store() */
  91     const char *names;           /* For get_decoder_from_store() */
  92     const char *propquery;       /* For get_decoder_from_store() */
  93
  94     OSSL_METHOD_STORE *tmp_store; /* For get_tmp_decoder_store() */
  95
  96     unsigned int flag_construct_error_occurred : 1;
  97 };
  98
  99 /*
 100  * Generic routines to fetch / create DECODER methods with
 101  * ossl_method_construct()
 102  */
 103
 104 /* Temporary decoder method store, constructor and destructor */
 105 static void *get_tmp_decoder_store(void *data)
 106 {
 107     struct decoder_data_st *methdata = data;
 108
 109     if (methdata->tmp_store == NULL)
 110         methdata->tmp_store = ossl_method_store_new(methdata->libctx);
 111     return methdata->tmp_store;
 112 }
 113
 114 static void dealloc_tmp_decoder_store(void *store)
 115 {
 116     if (store != NULL)
 117         ossl_method_store_free(store);
 118 }
 119
 120 /* Get the permanent decoder store */
 121 static OSSL_METHOD_STORE *get_decoder_store(OSSL_LIB_CTX *libctx)
 122 {
 123     return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_DECODER_STORE_INDEX,
 124                                  &decoder_store_method);
 125 }
 126
 127 /* Get decoder methods from a store, or put one in */
 128 static void *get_decoder_from_store(void *store, const OSSL_PROVIDER **prov,
 129                                     void *data)
 130 {
 131     struct decoder_data_st *methdata = data;
 132     void *method = NULL;
 133     int id;
 134
 135     /*
 136      * get_decoder_from_store() is only called to try and get the method
 137      * that OSSL_DECODER_fetch() is asking for, and the name or name id are
 138      * passed via methdata.
 139      */
 140     if ((id = methdata->id) == 0 && methdata->names != NULL) {
 141         OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 142         const char *names = methdata->names;
 143         const char *q = strchr(names, NAME_SEPARATOR);
 144         size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
 145
 146         if (namemap == 0)
 147             return NULL;
 148         id = ossl_namemap_name2num_n(namemap, names, l);
 149     }
 150
 151     if (id == 0)
 152         return NULL;
 153
 154     if (store == NULL
 155         && (store = get_decoder_store(methdata->libctx)) == NULL)
 156         return NULL;
 157
 158     if (!ossl_method_store_fetch(store, id, methdata->propquery, prov, &method))
 159         return NULL;
 160     return method;
 161 }
 162
 163 static int put_decoder_in_store(void *store, void *method,
 164                                 const OSSL_PROVIDER *prov,
 165                                 const char *names, const char *propdef,
 166                                 void *data)
 167 {
 168     struct decoder_data_st *methdata = data;
 169     OSSL_NAMEMAP *namemap;
 170     int id;
 171     size_t l = 0;
 172
 173     /*
 174      * put_decoder_in_store() is only called with an OSSL_DECODER method that
 175      * was successfully created by construct_decoder() below, which means that
 176      * all the names should already be stored in the namemap with the same
 177      * numeric identity, so just use the first to get that identity.
 178      */
 179     if (names != NULL) {
 180         const char *q = strchr(names, NAME_SEPARATOR);
 181
 182         l = (q == NULL ? strlen(names) : (size_t)(q - names));
 183     }
 184
 185     if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL
 186         || (id = ossl_namemap_name2num_n(namemap, names, l)) == 0)
 187         return 0;
 188
 189     if (store == NULL && (store = get_decoder_store(methdata->libctx)) == NULL)
 190         return 0;
 191
 192     return ossl_method_store_add(store, prov, id, propdef, method,
 193                                  (int (*)(void *))OSSL_DECODER_up_ref,
 194                                  (void (*)(void *))OSSL_DECODER_free);
 195 }
 196
 197 /* Create and populate a decoder method */
 198 void *ossl_decoder_from_algorithm(int id, const OSSL_ALGORITHM *algodef,
 199                                   OSSL_PROVIDER *prov)
 200 {
 201     OSSL_DECODER *decoder = NULL;
 202     const OSSL_DISPATCH *fns = algodef->implementation;
 203     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 204
 205     if ((decoder = ossl_decoder_new()) == NULL)
 206         return NULL;
 207     decoder->base.id = id;
 208     if ((decoder->base.name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
 209         OSSL_DECODER_free(decoder);
 210         return NULL;
 211     }
 212     decoder->base.algodef = algodef;
 213     decoder->base.parsed_propdef
 214         = ossl_parse_property(libctx, algodef->property_definition);
 215
 216     for (; fns->function_id != 0; fns++) {
 217         switch (fns->function_id) {
 218         case OSSL_FUNC_DECODER_NEWCTX:
 219             if (decoder->newctx == NULL)
 220                 decoder->newctx = OSSL_FUNC_decoder_newctx(fns);
 221             break;
 222         case OSSL_FUNC_DECODER_FREECTX:
 223             if (decoder->freectx == NULL)
 224                 decoder->freectx = OSSL_FUNC_decoder_freectx(fns);
 225             break;
 226         case OSSL_FUNC_DECODER_GET_PARAMS:
 227             if (decoder->get_params == NULL)
 228                 decoder->get_params =
 229                     OSSL_FUNC_decoder_get_params(fns);
 230             break;
 231         case OSSL_FUNC_DECODER_GETTABLE_PARAMS:
 232             if (decoder->gettable_params == NULL)
 233                 decoder->gettable_params =
 234                     OSSL_FUNC_decoder_gettable_params(fns);
 235             break;
 236         case OSSL_FUNC_DECODER_SET_CTX_PARAMS:
 237             if (decoder->set_ctx_params == NULL)
 238                 decoder->set_ctx_params =
 239                     OSSL_FUNC_decoder_set_ctx_params(fns);
 240             break;
 241         case OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS:
 242             if (decoder->settable_ctx_params == NULL)
 243                 decoder->settable_ctx_params =
 244                     OSSL_FUNC_decoder_settable_ctx_params(fns);
 245             break;
 246         case OSSL_FUNC_DECODER_DOES_SELECTION:
 247             if (decoder->does_selection == NULL)
 248                 decoder->does_selection =
 249                     OSSL_FUNC_decoder_does_selection(fns);
 250             break;
 251         case OSSL_FUNC_DECODER_DECODE:
 252             if (decoder->decode == NULL)
 253                 decoder->decode = OSSL_FUNC_decoder_decode(fns);
 254             break;
 255         case OSSL_FUNC_DECODER_EXPORT_OBJECT:
 256             if (decoder->export_object == NULL)
 257                 decoder->export_object = OSSL_FUNC_decoder_export_object(fns);
 258             break;
 259         }
 260     }
 261     /*
 262      * Try to check that the method is sensible.
 263      * If you have a constructor, you must have a destructor and vice versa.
 264      * You must have at least one of the encoding driver functions.
 265      */
 266     if (!((decoder->newctx == NULL && decoder->freectx == NULL)
 267           || (decoder->newctx != NULL && decoder->freectx != NULL))
 268         || decoder->decode == NULL) {
 269         OSSL_DECODER_free(decoder);
 270         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 271         return NULL;
 272     }
 273
 274     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 275         OSSL_DECODER_free(decoder);
 276         return NULL;
 277     }
 278
 279     decoder->base.prov = prov;
 280     return decoder;
 281 }
 282
 283
 284 /*
 285  * The core fetching functionality passes the names of the implementation.
 286  * This function is responsible to getting an identity number for them,
 287  * then call ossl_decoder_from_algorithm() with that identity number.
 288  */
 289 static void *construct_decoder(const OSSL_ALGORITHM *algodef,
 290                                OSSL_PROVIDER *prov, void *data)
 291 {
 292     /*
 293      * This function is only called if get_decoder_from_store() returned
 294      * NULL, so it's safe to say that of all the spots to create a new
 295      * namemap entry, this is it.  Should the name already exist there, we
 296      * know that ossl_namemap_add() will return its corresponding number.
 297      */
 298     struct decoder_data_st *methdata = data;
 299     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 300     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 301     const char *names = algodef->algorithm_names;
 302     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 303     void *method = NULL;
 304
 305     if (id != 0)
 306         method = ossl_decoder_from_algorithm(id, algodef, prov);
 307
 308     /*
 309      * Flag to indicate that there was actual construction errors.  This
 310      * helps inner_evp_generic_fetch() determine what error it should
 311      * record on inaccessible algorithms.
 312      */
 313     if (method == NULL)
 314         methdata->flag_construct_error_occurred = 1;
 315
 316     return method;
 317 }
 318
 319 /* Intermediary function to avoid ugly casts, used below */
 320 static void destruct_decoder(void *method, void *data)
 321 {
 322     OSSL_DECODER_free(method);
 323 }
 324
 325 static int up_ref_decoder(void *method)
 326 {
 327     return OSSL_DECODER_up_ref(method);
 328 }
 329
 330 static void free_decoder(void *method)
 331 {
 332     OSSL_DECODER_free(method);
 333 }
 334
 335 /* Fetching support.  Can fetch by numeric identity or by name */
 336 static OSSL_DECODER *
 337 inner_ossl_decoder_fetch(struct decoder_data_st *methdata, int id,
 338                          const char *name, const char *properties)
 339 {
 340     OSSL_METHOD_STORE *store = get_decoder_store(methdata->libctx);
 341     OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 342     void *method = NULL;
 343     int unsupported = 0;
 344
 345     if (store == NULL || namemap == NULL) {
 346         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_INVALID_ARGUMENT);
 347         return NULL;
 348     }
 349
 350     /*
 351      * If we have been passed both an id and a name, we have an
 352      * internal programming error.
 353      */
 354     if (!ossl_assert(id == 0 || name == NULL)) {
 355         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INTERNAL_ERROR);
 356         return NULL;
 357     }
 358
 359     if (id == 0 && name != NULL)
 360         id = ossl_namemap_name2num(namemap, name);
 361
 362     /*
 363      * If we haven't found the name yet, chances are that the algorithm to
 364      * be fetched is unsupported.
 365      */
 366     if (id == 0)
 367         unsupported = 1;
 368
 369     if (id == 0
 370         || !ossl_method_store_cache_get(store, NULL, id, properties, &method)) {
 371         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 372             get_tmp_decoder_store,
 373             get_decoder_from_store,
 374             put_decoder_in_store,
 375             construct_decoder,
 376             destruct_decoder
 377         };
 378
 379         methdata->id = id;
 380         methdata->names = name;
 381         methdata->propquery = properties;
 382         methdata->flag_construct_error_occurred = 0;
 383         if ((method = ossl_method_construct(methdata->libctx, OSSL_OP_DECODER,
 384                                             NULL, 0 /* !force_cache */,
 385                                             &mcm, methdata)) != NULL) {
 386             /*
 387              * If construction did create a method for us, we know that
 388              * there is a correct name_id and meth_id, since those have
 389              * already been calculated in get_decoder_from_store() and
 390              * put_decoder_in_store() above.
 391              */
 392             if (id == 0 && name != NULL)
 393                 id = ossl_namemap_name2num(namemap, name);
 394             if (id != 0)
 395                 ossl_method_store_cache_set(store, NULL, id, properties, method,
 396                                             up_ref_decoder, free_decoder);
 397         }
 398
 399         /*
 400          * If we never were in the constructor, the algorithm to be fetched
 401          * is unsupported.
 402          */
 403         unsupported = !methdata->flag_construct_error_occurred;
 404     }
 405
 406     if ((id != 0 || name != NULL) && method == NULL) {
 407         int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;
 408
 409         if (name == NULL)
 410             name = ossl_namemap_num2name(namemap, id, 0);
 411         ERR_raise_data(ERR_LIB_OSSL_DECODER, code,
 412                        "%s, Name (%s : %d), Properties (%s)",
 413                        ossl_lib_ctx_get_descriptor(methdata->libctx),
 414                        name = NULL ? "<null>" : name, id,
 415                        properties == NULL ? "<null>" : properties);
 416     }
 417
 418     return method;
 419 }
 420
 421 OSSL_DECODER *OSSL_DECODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
 422                                  const char *properties)
 423 {
 424     struct decoder_data_st methdata;
 425     void *method;
 426
 427     methdata.libctx = libctx;
 428     methdata.tmp_store = NULL;
 429     method = inner_ossl_decoder_fetch(&methdata, 0, name, properties);
 430     dealloc_tmp_decoder_store(methdata.tmp_store);
 431     return method;
 432 }
 433
 434 OSSL_DECODER *ossl_decoder_fetch_by_number(OSSL_LIB_CTX *libctx, int id,
 435                                            const char *properties)
 436 {
 437     struct decoder_data_st methdata;
 438     void *method;
 439
 440     methdata.libctx = libctx;
 441     methdata.tmp_store = NULL;
 442     method = inner_ossl_decoder_fetch(&methdata, id, NULL, properties);
 443     dealloc_tmp_decoder_store(methdata.tmp_store);
 444     return method;
 445 }
 446
 447 /*
 448  * Library of basic method functions
 449  */
 450
 451 const OSSL_PROVIDER *OSSL_DECODER_get0_provider(const OSSL_DECODER *decoder)
 452 {
 453     if (!ossl_assert(decoder != NULL)) {
 454         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 455         return 0;
 456     }
 457
 458     return decoder->base.prov;
 459 }
 460
 461 const char *OSSL_DECODER_get0_properties(const OSSL_DECODER *decoder)
 462 {
 463     if (!ossl_assert(decoder != NULL)) {
 464         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 465         return 0;
 466     }
 467
 468     return decoder->base.algodef->property_definition;
 469 }
 470
 471 const OSSL_PROPERTY_LIST *
 472 ossl_decoder_parsed_properties(const OSSL_DECODER *decoder)
 473 {
 474     if (!ossl_assert(decoder != NULL)) {
 475         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 476         return 0;
 477     }
 478
 479     return decoder->base.parsed_propdef;
 480 }
 481
 482 int ossl_decoder_get_number(const OSSL_DECODER *decoder)
 483 {
 484     if (!ossl_assert(decoder != NULL)) {
 485         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 486         return 0;
 487     }
 488
 489     return decoder->base.id;
 490 }
 491
 492 const char *OSSL_DECODER_get0_name(const OSSL_DECODER *decoder)
 493 {
 494     return decoder->base.name;
 495 }
 496
 497 const char *OSSL_DECODER_get0_description(const OSSL_DECODER *decoder)
 498 {
 499     return decoder->base.algodef->algorithm_description;
 500 }
 501
 502 int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name)
 503 {
 504     if (decoder->base.prov != NULL) {
 505         OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
 506         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 507
 508         return ossl_namemap_name2num(namemap, name) == decoder->base.id;
 509     }
 510     return 0;
 511 }
 512
 513 struct do_one_data_st {
 514     void (*user_fn)(OSSL_DECODER *decoder, void *arg);
 515     void *user_arg;
 516 };
 517
 518 static void do_one(ossl_unused int id, void *method, void *arg)
 519 {
 520     struct do_one_data_st *data = arg;
 521
 522     data->user_fn(method, data->user_arg);
 523 }
 524
 525 void OSSL_DECODER_do_all_provided(OSSL_LIB_CTX *libctx,
 526                                   void (*user_fn)(OSSL_DECODER *decoder,
 527                                                   void *arg),
 528                                   void *user_arg)
 529 {
 530     struct decoder_data_st methdata;
 531     struct do_one_data_st data;
 532
 533     methdata.libctx = libctx;
 534     methdata.tmp_store = NULL;
 535     (void)inner_ossl_decoder_fetch(&methdata, 0, NULL, NULL /* properties */);
 536
 537     data.user_fn = user_fn;
 538     data.user_arg = user_arg;
 539     if (methdata.tmp_store != NULL)
 540         ossl_method_store_do_all(methdata.tmp_store, &do_one, &data);
 541     ossl_method_store_do_all(get_decoder_store(libctx), &do_one, &data);
 542     dealloc_tmp_decoder_store(methdata.tmp_store);
 543 }
 544
 545 int OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
 546                               void (*fn)(const char *name, void *data),
 547                               void *data)
 548 {
 549     if (decoder == NULL)
 550         return 0;
 551
 552     if (decoder->base.prov != NULL) {
 553         OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
 554         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 555
 556         return ossl_namemap_doall_names(namemap, decoder->base.id, fn, data);
 557     }
 558
 559     return 1;
 560 }
 561
 562 const OSSL_PARAM *
 563 OSSL_DECODER_gettable_params(OSSL_DECODER *decoder)
 564 {
 565     if (decoder != NULL && decoder->gettable_params != NULL) {
 566         void *provctx = ossl_provider_ctx(OSSL_DECODER_get0_provider(decoder));
 567
 568         return decoder->gettable_params(provctx);
 569     }
 570     return NULL;
 571 }
 572
 573 int OSSL_DECODER_get_params(OSSL_DECODER *decoder, OSSL_PARAM params[])
 574 {
 575     if (decoder != NULL && decoder->get_params != NULL)
 576         return decoder->get_params(params);
 577     return 0;
 578 }
 579
 580 const OSSL_PARAM *
 581 OSSL_DECODER_settable_ctx_params(OSSL_DECODER *decoder)
 582 {
 583     if (decoder != NULL && decoder->settable_ctx_params != NULL) {
 584         void *provctx = ossl_provider_ctx(OSSL_DECODER_get0_provider(decoder));
 585
 586         return decoder->settable_ctx_params(provctx);
 587     }
 588     return NULL;
 589 }
 590
 591 /*
 592  * Decoder context support
 593  */
 594
 595 /*
 596  * |encoder| value NULL is valid, and signifies that there is no decoder.
 597  * This is useful to provide fallback mechanisms.
 598  *  Functions that want to verify if there is a decoder can do so with
 599  * OSSL_DECODER_CTX_get_decoder()
 600  */
 601 OSSL_DECODER_CTX *OSSL_DECODER_CTX_new(void)
 602 {
 603     OSSL_DECODER_CTX *ctx;
 604
 605     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
 606         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
 607
 608     return ctx;
 609 }
 610
 611 int OSSL_DECODER_CTX_set_params(OSSL_DECODER_CTX *ctx,
 612                                 const OSSL_PARAM params[])
 613 {
 614     int ok = 1;
 615     size_t i;
 616     size_t l;
 617
 618     if (!ossl_assert(ctx != NULL)) {
 619         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 620         return 0;
 621     }
 622
 623     if (ctx->decoder_insts == NULL)
 624         return 1;
 625
 626     l = OSSL_DECODER_CTX_get_num_decoders(ctx);
 627     for (i = 0; i < l; i++) {
 628         OSSL_DECODER_INSTANCE *decoder_inst =
 629             sk_OSSL_DECODER_INSTANCE_value(ctx->decoder_insts, i);
 630         OSSL_DECODER *decoder =
 631             OSSL_DECODER_INSTANCE_get_decoder(decoder_inst);
 632         OSSL_DECODER *decoderctx =
 633             OSSL_DECODER_INSTANCE_get_decoder_ctx(decoder_inst);
 634
 635         if (decoderctx == NULL || decoder->set_ctx_params == NULL)
 636             continue;
 637         if (!decoder->set_ctx_params(decoderctx, params))
 638             ok = 0;
 639     }
 640     return ok;
 641 }
 642
 643 void OSSL_DECODER_CTX_free(OSSL_DECODER_CTX *ctx)
 644 {
 645     if (ctx != NULL) {
 646         if (ctx->cleanup != NULL)
 647             ctx->cleanup(ctx->construct_data);
 648         sk_OSSL_DECODER_INSTANCE_pop_free(ctx->decoder_insts,
 649                                           ossl_decoder_instance_free);
 650         ossl_pw_clear_passphrase_data(&ctx->pwdata);
 651         OPENSSL_free(ctx);
 652     }
 653 }