providers/nullprov.c

   1 /*
   2  * Copyright 2020 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 <string.h>
  11 #include <stdio.h>
  12 #include <openssl/core.h>
  13 #include <openssl/core_dispatch.h>
  14 #include <openssl/core_names.h>
  15 #include <openssl/params.h>
  16 #include "prov/implementations.h"
  17
  18 OSSL_provider_init_fn ossl_null_provider_init;
  19
  20 /* Parameters we provide to the core */
  21 static const OSSL_ITEM null_param_types[] = {
  22     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_NAME },
  23     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_VERSION },
  24     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_BUILDINFO },
  25     { 0, NULL }
  26 };
  27
  28 static const OSSL_ITEM *null_gettable_params(const OSSL_PROVIDER *prov)
  29 {
  30     return null_param_types;
  31 }
  32
  33 static int null_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[])
  34 {
  35     OSSL_PARAM *p;
  36
  37     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_NAME);
  38     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "OpenSSL Null Provider"))
  39         return 0;
  40     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_VERSION);
  41     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR))
  42         return 0;
  43     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_BUILDINFO);
  44     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_FULL_VERSION_STR))
  45         return 0;
  46
  47     return 1;
  48 }
  49
  50 static const OSSL_ALGORITHM *null_query(OSSL_PROVIDER *prov,
  51                                           int operation_id,
  52                                           int *no_cache)
  53 {
  54     *no_cache = 0;
  55     return NULL;
  56 }
  57
  58 /* Functions we provide to the core */
  59 static const OSSL_DISPATCH null_dispatch_table[] = {
  60     { OSSL_FUNC_PROVIDER_GETTABLE_PARAMS, (void (*)(void))null_gettable_params },
  61     { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))null_get_params },
  62     { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))null_query },
  63     { 0, NULL }
  64 };
  65
  66 int ossl_null_provider_init(const OSSL_CORE_HANDLE *handle,
  67                             const OSSL_DISPATCH *in,
  68                             const OSSL_DISPATCH **out,
  69                             void **provctx)
  70 {
  71     *out = null_dispatch_table;
  72
  73     /* Could be anything - we don't use it */
  74     *provctx = (void *)handle;
  75     return 1;
  76 }