crypto/core_fetch.c

   1 /*
   2  * Copyright 2019 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 <stddef.h>
  11
  12 #include <openssl/core.h>
  13 #include "internal/cryptlib.h"
  14 #include "internal/core.h"
  15 #include "internal/property.h"
  16 #include "internal/provider.h"
  17
  18 struct construct_data_st {
  19     OPENSSL_CTX *libctx;
  20     OSSL_METHOD_STORE *store;
  21     int operation_id;
  22     int force_store;
  23     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
  24     void *mcm_data;
  25 };
  26
  27 static void ossl_method_construct_this(OSSL_PROVIDER *provider,
  28                                        const OSSL_ALGORITHM *algo,
  29                                        int no_store, void *cbdata)
  30 {
  31     struct construct_data_st *data = cbdata;
  32     void *method = NULL;
  33
  34     if ((method = data->mcm->construct(algo, provider, data->mcm_data))
  35         == NULL)
  36         return;
  37
  38     /*
  39      * Note regarding putting the method in stores:
  40      *
  41      * we don't need to care if it actually got in or not here.
  42      * If it didn't get in, it will simply not be available when
  43      * ossl_method_construct() tries to get it from the store.
  44      *
  45      * It is *expected* that the put function increments the refcnt
  46      * of the passed method.
  47      */
  48
  49     if (data->force_store || !no_store) {
  50         /*
  51          * If we haven't been told not to store,
  52          * add to the global store
  53          */
  54         data->mcm->put(data->libctx, NULL, method, provider,
  55                        data->operation_id, algo->algorithm_names,
  56                        algo->property_definition, data->mcm_data);
  57     }
  58
  59     data->mcm->put(data->libctx, data->store, method, provider,
  60                    data->operation_id, algo->algorithm_names,
  61                    algo->property_definition, data->mcm_data);
  62
  63     /* refcnt-- because we're dropping the reference */
  64     data->mcm->destruct(method, data->mcm_data);
  65 }
  66
  67 void *ossl_method_construct(OPENSSL_CTX *libctx, int operation_id,
  68                             int force_store,
  69                             OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
  70 {
  71     void *method = NULL;
  72
  73     if ((method = mcm->get(libctx, NULL, mcm_data)) == NULL) {
  74         struct construct_data_st cbdata;
  75
  76         /*
  77          * We have a temporary store to be able to easily search among new
  78          * items, or items that should find themselves in the global store.
  79          */
  80         if ((cbdata.store = mcm->alloc_tmp_store(libctx)) == NULL)
  81             goto fin;
  82
  83         cbdata.libctx = libctx;
  84         cbdata.operation_id = operation_id;
  85         cbdata.force_store = force_store;
  86         cbdata.mcm = mcm;
  87         cbdata.mcm_data = mcm_data;
  88         ossl_algorithm_do_all(libctx, operation_id, NULL,
  89                               ossl_method_construct_this, &cbdata);
  90
  91         method = mcm->get(libctx, cbdata.store, mcm_data);
  92         mcm->dealloc_tmp_store(cbdata.store);
  93     }
  94
  95  fin:
  96     return method;
  97 }