crypto/encode_decode/decoder_meth.c

   1 /*
   2  * Copyright 2020-2025 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 #include "crypto/context.h"
  21
  22 /*
  23  * Decoder can have multiple names, separated with colons in a name string
  24  */
  25 #define NAME_SEPARATOR ':'
  26
  27 static void ossl_decoder_free(void *data)
  28 {
  29     OSSL_DECODER_free(data);
  30 }
  31
  32 static int ossl_decoder_up_ref(void *data)
  33 {
  34     return OSSL_DECODER_up_ref(data);
  35 }
  36
  37 /* Simple method structure constructor and destructor */
  38 static OSSL_DECODER *ossl_decoder_new(void)
  39 {
  40     OSSL_DECODER *decoder = NULL;
  41
  42     if ((decoder = OPENSSL_zalloc(sizeof(*decoder))) == NULL)
  43         return NULL;
  44     if (!CRYPTO_NEW_REF(&decoder->base.refcnt, 1)) {
  45         OSSL_DECODER_free(decoder);
  46         return NULL;
  47     }
  48
  49     return decoder;
  50 }
  51
  52 int OSSL_DECODER_up_ref(OSSL_DECODER *decoder)
  53 {
  54     int ref = 0;
  55
  56     CRYPTO_UP_REF(&decoder->base.refcnt, &ref);
  57     return 1;
  58 }
  59
  60 void OSSL_DECODER_free(OSSL_DECODER *decoder)
  61 {
  62     int ref = 0;
  63
  64     if (decoder == NULL)
  65         return;
  66
  67     CRYPTO_DOWN_REF(&decoder->base.refcnt, &ref);
  68     if (ref > 0)
  69         return;
  70     OPENSSL_free(decoder->base.name);
  71     ossl_property_free(decoder->base.parsed_propdef);
  72     ossl_provider_free(decoder->base.prov);
  73     CRYPTO_FREE_REF(&decoder->base.refcnt);
  74     OPENSSL_free(decoder);
  75 }
  76
  77 /* Data to be passed through ossl_method_construct() */
  78 struct decoder_data_st {
  79     OSSL_LIB_CTX *libctx;
  80     int id;                      /* For get_decoder_from_store() */
  81     const char *names;           /* For get_decoder_from_store() */
  82     const char *propquery;       /* For get_decoder_from_store() */
  83
  84     OSSL_METHOD_STORE *tmp_store; /* For get_tmp_decoder_store() */
  85
  86     unsigned int flag_construct_error_occurred : 1;
  87 };
  88
  89 /*
  90  * Generic routines to fetch / create DECODER methods with
  91  * ossl_method_construct()
  92  */
  93
  94 /* Temporary decoder method store, constructor and destructor */
  95 static void *get_tmp_decoder_store(void *data)
  96 {
  97     struct decoder_data_st *methdata = data;
  98
  99     if (methdata->tmp_store == NULL)
 100         methdata->tmp_store = ossl_method_store_new(methdata->libctx);
 101     return methdata->tmp_store;
 102 }
 103
 104 static void dealloc_tmp_decoder_store(void *store)
 105 {
 106     if (store != NULL)
 107         ossl_method_store_free(store);
 108 }
 109
 110 /* Get the permanent decoder store */
 111 static OSSL_METHOD_STORE *get_decoder_store(OSSL_LIB_CTX *libctx)
 112 {
 113     return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_DECODER_STORE_INDEX);
 114 }
 115
 116 static int reserve_decoder_store(void *store, void *data)
 117 {
 118     struct decoder_data_st *methdata = data;
 119
 120     if (store == NULL
 121         && (store = get_decoder_store(methdata->libctx)) == NULL)
 122         return 0;
 123
 124     return ossl_method_lock_store(store);
 125 }
 126
 127 static int unreserve_decoder_store(void *store, void *data)
 128 {
 129     struct decoder_data_st *methdata = data;
 130
 131     if (store == NULL
 132         && (store = get_decoder_store(methdata->libctx)) == NULL)
 133         return 0;
 134
 135     return ossl_method_unlock_store(store);
 136 }
 137
 138 /* Get decoder methods from a store, or put one in */
 139 static void *get_decoder_from_store(void *store, const OSSL_PROVIDER **prov,
 140                                     void *data)
 141 {
 142     struct decoder_data_st *methdata = data;
 143     void *method = NULL;
 144     int id;
 145
 146     /*
 147      * get_decoder_from_store() is only called to try and get the method
 148      * that OSSL_DECODER_fetch() is asking for, and the name or name id are
 149      * passed via methdata.
 150      */
 151     if ((id = methdata->id) == 0 && methdata->names != NULL) {
 152         OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 153         const char *names = methdata->names;
 154         const char *q = strchr(names, NAME_SEPARATOR);
 155         size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
 156
 157         if (namemap == 0)
 158             return NULL;
 159         id = ossl_namemap_name2num_n(namemap, names, l);
 160     }
 161
 162     if (id == 0)
 163         return NULL;
 164
 165     if (store == NULL
 166         && (store = get_decoder_store(methdata->libctx)) == NULL)
 167         return NULL;
 168
 169     if (!ossl_method_store_fetch(store, id, methdata->propquery, prov, &method))
 170         return NULL;
 171     return method;
 172 }
 173
 174 static int put_decoder_in_store(void *store, void *method,
 175                                 const OSSL_PROVIDER *prov,
 176                                 const char *names, const char *propdef,
 177                                 void *data)
 178 {
 179     struct decoder_data_st *methdata = data;
 180     OSSL_NAMEMAP *namemap;
 181     int id;
 182     size_t l = 0;
 183
 184     /*
 185      * put_decoder_in_store() is only called with an OSSL_DECODER method that
 186      * was successfully created by construct_decoder() below, which means that
 187      * all the names should already be stored in the namemap with the same
 188      * numeric identity, so just use the first to get that identity.
 189      */
 190     if (names != NULL) {
 191         const char *q = strchr(names, NAME_SEPARATOR);
 192
 193         l = (q == NULL ? strlen(names) : (size_t)(q - names));
 194     }
 195
 196     if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL
 197         || (id = ossl_namemap_name2num_n(namemap, names, l)) == 0)
 198         return 0;
 199
 200     if (store == NULL && (store = get_decoder_store(methdata->libctx)) == NULL)
 201         return 0;
 202
 203     return ossl_method_store_add(store, prov, id, propdef, method,
 204                                  ossl_decoder_up_ref,
 205                                  ossl_decoder_free);
 206 }
 207
 208 /* Create and populate a decoder method */
 209 void *ossl_decoder_from_algorithm(int id, const OSSL_ALGORITHM *algodef,
 210                                   OSSL_PROVIDER *prov)
 211 {
 212     OSSL_DECODER *decoder = NULL;
 213     const OSSL_DISPATCH *fns = algodef->implementation;
 214     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 215
 216     if ((decoder = ossl_decoder_new()) == NULL)
 217         return NULL;
 218     decoder->base.id = id;
 219     if ((decoder->base.name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
 220         OSSL_DECODER_free(decoder);
 221         return NULL;
 222     }
 223     decoder->base.algodef = algodef;
 224     if ((decoder->base.parsed_propdef
 225          = ossl_parse_property(libctx, algodef->property_definition)) == NULL) {
 226         OSSL_DECODER_free(decoder);
 227         return NULL;
 228     }
 229
 230     for (; fns->function_id != 0; fns++) {
 231         switch (fns->function_id) {
 232         case OSSL_FUNC_DECODER_NEWCTX:
 233             if (decoder->newctx == NULL)
 234                 decoder->newctx = OSSL_FUNC_decoder_newctx(fns);
 235             break;
 236         case OSSL_FUNC_DECODER_FREECTX:
 237             if (decoder->freectx == NULL)
 238                 decoder->freectx = OSSL_FUNC_decoder_freectx(fns);
 239             break;
 240         case OSSL_FUNC_DECODER_GET_PARAMS:
 241             if (decoder->get_params == NULL)
 242                 decoder->get_params =
 243                     OSSL_FUNC_decoder_get_params(fns);
 244             break;
 245         case OSSL_FUNC_DECODER_GETTABLE_PARAMS:
 246             if (decoder->gettable_params == NULL)
 247                 decoder->gettable_params =
 248                     OSSL_FUNC_decoder_gettable_params(fns);
 249             break;
 250         case OSSL_FUNC_DECODER_SET_CTX_PARAMS:
 251             if (decoder->set_ctx_params == NULL)
 252                 decoder->set_ctx_params =
 253                     OSSL_FUNC_decoder_set_ctx_params(fns);
 254             break;
 255         case OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS:
 256             if (decoder->settable_ctx_params == NULL)
 257                 decoder->settable_ctx_params =
 258                     OSSL_FUNC_decoder_settable_ctx_params(fns);
 259             break;
 260         case OSSL_FUNC_DECODER_DOES_SELECTION:
 261             if (decoder->does_selection == NULL)
 262                 decoder->does_selection =
 263                     OSSL_FUNC_decoder_does_selection(fns);
 264             break;
 265         case OSSL_FUNC_DECODER_DECODE:
 266             if (decoder->decode == NULL)
 267                 decoder->decode = OSSL_FUNC_decoder_decode(fns);
 268             break;
 269         case OSSL_FUNC_DECODER_EXPORT_OBJECT:
 270             if (decoder->export_object == NULL)
 271                 decoder->export_object = OSSL_FUNC_decoder_export_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 at least one of the encoding driver functions.
 279      */
 280     if (!((decoder->newctx == NULL && decoder->freectx == NULL)
 281           || (decoder->newctx != NULL && decoder->freectx != NULL))
 282         || decoder->decode == NULL) {
 283         OSSL_DECODER_free(decoder);
 284         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 285         return NULL;
 286     }
 287
 288     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 289         OSSL_DECODER_free(decoder);
 290         return NULL;
 291     }
 292
 293     decoder->base.prov = prov;
 294     return decoder;
 295 }
 296
 297
 298 /*
 299  * The core fetching functionality passes the names of the implementation.
 300  * This function is responsible to getting an identity number for them,
 301  * then call ossl_decoder_from_algorithm() with that identity number.
 302  */
 303 static void *construct_decoder(const OSSL_ALGORITHM *algodef,
 304                                OSSL_PROVIDER *prov, void *data)
 305 {
 306     /*
 307      * This function is only called if get_decoder_from_store() returned
 308      * NULL, so it's safe to say that of all the spots to create a new
 309      * namemap entry, this is it.  Should the name already exist there, we
 310      * know that ossl_namemap_add() will return its corresponding number.
 311      */
 312     struct decoder_data_st *methdata = data;
 313     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 314     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 315     const char *names = algodef->algorithm_names;
 316     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 317     void *method = NULL;
 318
 319     if (id != 0)
 320         method = ossl_decoder_from_algorithm(id, algodef, prov);
 321
 322     /*
 323      * Flag to indicate that there was actual construction errors.  This
 324      * helps inner_evp_generic_fetch() determine what error it should
 325      * record on inaccessible algorithms.
 326      */
 327     if (method == NULL)
 328         methdata->flag_construct_error_occurred = 1;
 329
 330     return method;
 331 }
 332
 333 /* Intermediary function to avoid ugly casts, used below */
 334 static void destruct_decoder(void *method, void *data)
 335 {
 336     OSSL_DECODER_free(method);
 337 }
 338
 339 static int up_ref_decoder(void *method)
 340 {
 341     return OSSL_DECODER_up_ref(method);
 342 }
 343
 344 static void free_decoder(void *method)
 345 {
 346     OSSL_DECODER_free(method);
 347 }
 348
 349 /* Fetching support.  Can fetch by numeric identity or by name */
 350 static OSSL_DECODER *
 351 inner_ossl_decoder_fetch(struct decoder_data_st *methdata,
 352                          const char *name, const char *properties)
 353 {
 354     OSSL_METHOD_STORE *store = get_decoder_store(methdata->libctx);
 355     OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);
 356     const char *const propq = properties != NULL ? properties : "";
 357     void *method = NULL;
 358     int unsupported, id;
 359
 360     if (store == NULL || namemap == NULL) {
 361         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_INVALID_ARGUMENT);
 362         return NULL;
 363     }
 364
 365     id = name != NULL ? ossl_namemap_name2num(namemap, name) : 0;
 366
 367     /*
 368      * If we haven't found the name yet, chances are that the algorithm to
 369      * be fetched is unsupported.
 370      */
 371     unsupported = id == 0;
 372
 373     if (id == 0
 374         || !ossl_method_store_cache_get(store, NULL, id, propq, &method)) {
 375         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 376             get_tmp_decoder_store,
 377             reserve_decoder_store,
 378             unreserve_decoder_store,
 379             get_decoder_from_store,
 380             put_decoder_in_store,
 381             construct_decoder,
 382             destruct_decoder
 383         };
 384         OSSL_PROVIDER *prov = NULL;
 385
 386         methdata->id = id;
 387         methdata->names = name;
 388         methdata->propquery = propq;
 389         methdata->flag_construct_error_occurred = 0;
 390         if ((method = ossl_method_construct(methdata->libctx, OSSL_OP_DECODER,
 391                                             &prov, 0 /* !force_cache */,
 392                                             &mcm, methdata)) != NULL) {
 393             /*
 394              * If construction did create a method for us, we know that
 395              * there is a correct name_id and meth_id, since those have
 396              * already been calculated in get_decoder_from_store() and
 397              * put_decoder_in_store() above.
 398              */
 399             if (id == 0 && name != NULL)
 400                 id = ossl_namemap_name2num(namemap, name);
 401             if (id != 0)
 402                 ossl_method_store_cache_set(store, prov, id, propq, method,
 403                                             up_ref_decoder, free_decoder);
 404         }
 405
 406         /*
 407          * If we never were in the constructor, the algorithm to be fetched
 408          * is unsupported.
 409          */
 410         unsupported = !methdata->flag_construct_error_occurred;
 411     }
 412
 413     if ((id != 0 || name != NULL) && method == NULL) {
 414         int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;
 415
 416         if (name == NULL)
 417             name = ossl_namemap_num2name(namemap, id, 0);
 418         ERR_raise_data(ERR_LIB_OSSL_DECODER, code,
 419                        "%s, Name (%s : %d), Properties (%s)",
 420                        ossl_lib_ctx_get_descriptor(methdata->libctx),
 421                        name == NULL ? "<null>" : name, id,
 422                        properties == NULL ? "<null>" : properties);
 423     }
 424
 425     return method;
 426 }
 427
 428 OSSL_DECODER *OSSL_DECODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
 429                                  const char *properties)
 430 {
 431     struct decoder_data_st methdata;
 432     void *method;
 433
 434     methdata.libctx = libctx;
 435     methdata.tmp_store = NULL;
 436     method = inner_ossl_decoder_fetch(&methdata, name, properties);
 437     dealloc_tmp_decoder_store(methdata.tmp_store);
 438     return method;
 439 }
 440
 441 int ossl_decoder_store_cache_flush(OSSL_LIB_CTX *libctx)
 442 {
 443     OSSL_METHOD_STORE *store = get_decoder_store(libctx);
 444
 445     if (store != NULL)
 446         return ossl_method_store_cache_flush_all(store);
 447     return 1;
 448 }
 449
 450 int ossl_decoder_store_remove_all_provided(const OSSL_PROVIDER *prov)
 451 {
 452     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
 453     OSSL_METHOD_STORE *store = get_decoder_store(libctx);
 454
 455     if (store != NULL)
 456         return ossl_method_store_remove_all_provided(store, prov);
 457     return 1;
 458 }
 459
 460 /*
 461  * Library of basic method functions
 462  */
 463
 464 const OSSL_PROVIDER *OSSL_DECODER_get0_provider(const OSSL_DECODER *decoder)
 465 {
 466     if (!ossl_assert(decoder != NULL)) {
 467         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 468         return 0;
 469     }
 470
 471     return decoder->base.prov;
 472 }
 473
 474 const char *OSSL_DECODER_get0_properties(const OSSL_DECODER *decoder)
 475 {
 476     if (!ossl_assert(decoder != NULL)) {
 477         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 478         return 0;
 479     }
 480
 481     return decoder->base.algodef->property_definition;
 482 }
 483
 484 const OSSL_PROPERTY_LIST *
 485 ossl_decoder_parsed_properties(const OSSL_DECODER *decoder)
 486 {
 487     if (!ossl_assert(decoder != NULL)) {
 488         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 489         return 0;
 490     }
 491
 492     return decoder->base.parsed_propdef;
 493 }
 494
 495 int ossl_decoder_get_number(const OSSL_DECODER *decoder)
 496 {
 497     if (!ossl_assert(decoder != NULL)) {
 498         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 499         return 0;
 500     }
 501
 502     return decoder->base.id;
 503 }
 504
 505 const char *OSSL_DECODER_get0_name(const OSSL_DECODER *decoder)
 506 {
 507     return decoder->base.name;
 508 }
 509
 510 const char *OSSL_DECODER_get0_description(const OSSL_DECODER *decoder)
 511 {
 512     return decoder->base.algodef->algorithm_description;
 513 }
 514
 515 int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name)
 516 {
 517     if (decoder->base.prov != NULL) {
 518         OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
 519         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 520
 521         return ossl_namemap_name2num(namemap, name) == decoder->base.id;
 522     }
 523     return 0;
 524 }
 525
 526 static int resolve_name(OSSL_DECODER *decoder, const char *name)
 527 {
 528     OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
 529     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 530
 531     return ossl_namemap_name2num(namemap, name);
 532 }
 533
 534 int ossl_decoder_fast_is_a(OSSL_DECODER *decoder, const char *name, int *id_cache)
 535 {
 536     int id = *id_cache;
 537
 538     if (id <= 0)
 539         *id_cache = id = resolve_name(decoder, name);
 540
 541     return id > 0 && ossl_decoder_get_number(decoder) == id;
 542 }
 543
 544 struct do_one_data_st {
 545     void (*user_fn)(OSSL_DECODER *decoder, void *arg);
 546     void *user_arg;
 547 };
 548
 549 static void do_one(ossl_unused int id, void *method, void *arg)
 550 {
 551     struct do_one_data_st *data = arg;
 552
 553     data->user_fn(method, data->user_arg);
 554 }
 555
 556 void OSSL_DECODER_do_all_provided(OSSL_LIB_CTX *libctx,
 557                                   void (*user_fn)(OSSL_DECODER *decoder,
 558                                                   void *arg),
 559                                   void *user_arg)
 560 {
 561     struct decoder_data_st methdata;
 562     struct do_one_data_st data;
 563
 564     methdata.libctx = libctx;
 565     methdata.tmp_store = NULL;
 566     (void)inner_ossl_decoder_fetch(&methdata, NULL, NULL /* properties */);
 567
 568     data.user_fn = user_fn;
 569     data.user_arg = user_arg;
 570     if (methdata.tmp_store != NULL)
 571         ossl_method_store_do_all(methdata.tmp_store, &do_one, &data);
 572     ossl_method_store_do_all(get_decoder_store(libctx), &do_one, &data);
 573     dealloc_tmp_decoder_store(methdata.tmp_store);
 574 }
 575
 576 int OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
 577                               void (*fn)(const char *name, void *data),
 578                               void *data)
 579 {
 580     if (decoder == NULL)
 581         return 0;
 582
 583     if (decoder->base.prov != NULL) {
 584         OSSL_LIB_CTX *libctx = ossl_provider_libctx(decoder->base.prov);
 585         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 586
 587         return ossl_namemap_doall_names(namemap, decoder->base.id, fn, data);
 588     }
 589
 590     return 1;
 591 }
 592
 593 const OSSL_PARAM *
 594 OSSL_DECODER_gettable_params(OSSL_DECODER *decoder)
 595 {
 596     if (decoder != NULL && decoder->gettable_params != NULL) {
 597         void *provctx = ossl_provider_ctx(OSSL_DECODER_get0_provider(decoder));
 598
 599         return decoder->gettable_params(provctx);
 600     }
 601     return NULL;
 602 }
 603
 604 int OSSL_DECODER_get_params(OSSL_DECODER *decoder, OSSL_PARAM params[])
 605 {
 606     if (decoder != NULL && decoder->get_params != NULL)
 607         return decoder->get_params(params);
 608     return 0;
 609 }
 610
 611 const OSSL_PARAM *
 612 OSSL_DECODER_settable_ctx_params(OSSL_DECODER *decoder)
 613 {
 614     if (decoder != NULL && decoder->settable_ctx_params != NULL) {
 615         void *provctx = ossl_provider_ctx(OSSL_DECODER_get0_provider(decoder));
 616
 617         return decoder->settable_ctx_params(provctx);
 618     }
 619     return NULL;
 620 }
 621
 622 /*
 623  * Decoder context support
 624  */
 625
 626 /*
 627  * |encoder| value NULL is valid, and signifies that there is no decoder.
 628  * This is useful to provide fallback mechanisms.
 629  *  Functions that want to verify if there is a decoder can do so with
 630  * OSSL_DECODER_CTX_get_decoder()
 631  */
 632 OSSL_DECODER_CTX *OSSL_DECODER_CTX_new(void)
 633 {
 634     OSSL_DECODER_CTX *ctx;
 635
 636     ctx = OPENSSL_zalloc(sizeof(*ctx));
 637     return ctx;
 638 }
 639
 640 int OSSL_DECODER_CTX_set_params(OSSL_DECODER_CTX *ctx,
 641                                 const OSSL_PARAM params[])
 642 {
 643     int ok = 1;
 644     int i;
 645     int l;
 646
 647     if (!ossl_assert(ctx != NULL)) {
 648         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 649         return 0;
 650     }
 651
 652     if (ctx->decoder_insts == NULL)
 653         return 1;
 654
 655     l = OSSL_DECODER_CTX_get_num_decoders(ctx);
 656     for (i = 0; i < l; i++) {
 657         OSSL_DECODER_INSTANCE *decoder_inst =
 658             sk_OSSL_DECODER_INSTANCE_value(ctx->decoder_insts, i);
 659         OSSL_DECODER *decoder =
 660             OSSL_DECODER_INSTANCE_get_decoder(decoder_inst);
 661         OSSL_DECODER *decoderctx =
 662             OSSL_DECODER_INSTANCE_get_decoder_ctx(decoder_inst);
 663
 664         if (decoderctx == NULL || decoder->set_ctx_params == NULL)
 665             continue;
 666         if (!decoder->set_ctx_params(decoderctx, params))
 667             ok = 0;
 668     }
 669     return ok;
 670 }
 671
 672 void OSSL_DECODER_CTX_free(OSSL_DECODER_CTX *ctx)
 673 {
 674     if (ctx != NULL) {
 675         if (ctx->cleanup != NULL)
 676             ctx->cleanup(ctx->construct_data);
 677         sk_OSSL_DECODER_INSTANCE_pop_free(ctx->decoder_insts,
 678                                           ossl_decoder_instance_free);
 679         ossl_pw_clear_passphrase_data(&ctx->pwdata);
 680         OPENSSL_free(ctx);
 681     }
 682 }