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#include "prov/providercommon.h"
18
19OSSL_provider_init_fn ossl_null_provider_init;
20
21/* Parameters we provide to the core */
22static const OSSL_PARAM null_param_types[] = {
23    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_NAME, OSSL_PARAM_UTF8_PTR, NULL, 0),
24    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_VERSION, OSSL_PARAM_UTF8_PTR, NULL, 0),
25    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_BUILDINFO, OSSL_PARAM_UTF8_PTR, NULL, 0),
26    OSSL_PARAM_DEFN(OSSL_PROV_PARAM_STATUS, OSSL_PARAM_INTEGER, NULL, 0),
27    OSSL_PARAM_END
28};
29
30static const OSSL_PARAM *null_gettable_params(const OSSL_PROVIDER *prov)
31{
32    return null_param_types;
33}
34
35static int null_get_params(const OSSL_PROVIDER *provctx, OSSL_PARAM params[])
36{
37    OSSL_PARAM *p;
38
39    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_NAME);
40    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "OpenSSL Null Provider"))
41        return 0;
42    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_VERSION);
43    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR))
44        return 0;
45    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_BUILDINFO);
46    if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_FULL_VERSION_STR))
47        return 0;
48    p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_STATUS);
49    if (p != NULL && !OSSL_PARAM_set_int(p, ossl_prov_is_running()))
50        return 0;
51    return 1;
52}
53
54static const OSSL_ALGORITHM *null_query(OSSL_PROVIDER *prov,
55                                          int operation_id,
56                                          int *no_cache)
57{
58    *no_cache = 0;
59    return NULL;
60}
61
62/* Functions we provide to the core */
63static const OSSL_DISPATCH null_dispatch_table[] = {
64    { OSSL_FUNC_PROVIDER_GETTABLE_PARAMS, (void (*)(void))null_gettable_params },
65    { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))null_get_params },
66    { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))null_query },
67    { 0, NULL }
68};
69
70int ossl_null_provider_init(const OSSL_CORE_HANDLE *handle,
71                            const OSSL_DISPATCH *in,
72                            const OSSL_DISPATCH **out,
73                            void **provctx)
74{
75    *out = null_dispatch_table;
76
77    /* Could be anything - we don't use it */
78    *provctx = (void *)handle;
79    return 1;
80}
81