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021a6552 RL |
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 | /* | |
11 | * This is a very simple provider that does absolutely nothing except respond | |
12 | * to provider global parameter requests. It does this by simply echoing back | |
13 | * a parameter request it makes to the loading library. | |
14 | */ | |
15 | ||
16 | #include <string.h> | |
17 | #include <stdio.h> | |
18 | ||
19 | /* | |
20 | * When built as an object file to link the application with, we get the | |
21 | * init function name through the macro PROVIDER_INIT_FUNCTION_NAME. If | |
22 | * not defined, we use the standard init function name for the shared | |
23 | * object form. | |
24 | */ | |
25 | #ifdef PROVIDER_INIT_FUNCTION_NAME | |
26 | # define OSSL_provider_init PROVIDER_INIT_FUNCTION_NAME | |
27 | #endif | |
28 | ||
29 | #include <openssl/core.h> | |
30 | #include <openssl/core_numbers.h> | |
31 | ||
32 | static OSSL_core_get_param_types_fn *c_get_param_types = NULL; | |
33 | static OSSL_core_get_params_fn *c_get_params = NULL; | |
34 | ||
35 | /* Tell the core what params we provide and what type they are */ | |
36 | static const OSSL_ITEM p_param_types[] = { | |
37 | { OSSL_PARAM_UTF8_STRING, "greeting" }, | |
38 | { 0, NULL } | |
39 | }; | |
40 | ||
41 | static const OSSL_ITEM *p_get_param_types(const OSSL_PROVIDER *_) | |
42 | { | |
43 | return p_param_types; | |
44 | } | |
45 | ||
46 | static int p_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[]) | |
47 | { | |
48 | const OSSL_PARAM *p = params; | |
49 | int ok = 1; | |
50 | ||
51 | for (; ok && p->key != NULL; p++) { | |
52 | if (strcmp(p->key, "greeting") == 0) { | |
53 | static char *opensslv = NULL; | |
54 | static char *provname = NULL; | |
6d872a83 | 55 | static char *greeting = NULL; |
021a6552 | 56 | static OSSL_PARAM counter_request[] = { |
6d872a83 | 57 | /* Known libcrypto provided parameters */ |
e2146e12 | 58 | { "openssl-version", OSSL_PARAM_UTF8_PTR, |
021a6552 | 59 | &opensslv, sizeof(&opensslv), NULL }, |
e2146e12 | 60 | { "provider-name", OSSL_PARAM_UTF8_PTR, |
021a6552 | 61 | &provname, sizeof(&provname), NULL}, |
6d872a83 RL |
62 | |
63 | /* This might be present, if there's such a configuration */ | |
64 | { "greeting", OSSL_PARAM_UTF8_PTR, | |
65 | &greeting, sizeof(&greeting), NULL }, | |
66 | ||
021a6552 RL |
67 | { NULL, 0, NULL, 0, NULL } |
68 | }; | |
69 | char buf[256]; | |
70 | size_t buf_l; | |
71 | ||
72 | if (c_get_params(prov, counter_request)) { | |
6d872a83 RL |
73 | if (greeting) { |
74 | strcpy(buf, greeting); | |
75 | } else { | |
76 | const char *versionp = *(void **)counter_request[0].data; | |
77 | const char *namep = *(void **)counter_request[1].data; | |
78 | ||
79 | sprintf(buf, "Hello OpenSSL %.20s, greetings from %s!", | |
80 | versionp, namep); | |
81 | } | |
021a6552 RL |
82 | } else { |
83 | sprintf(buf, "Howdy stranger..."); | |
84 | } | |
85 | ||
86 | *p->return_size = buf_l = strlen(buf) + 1; | |
8c4412ed RL |
87 | if (p->data_size >= buf_l) |
88 | strncpy(p->data, buf, buf_l); | |
021a6552 RL |
89 | else |
90 | ok = 0; | |
91 | } | |
92 | } | |
93 | return ok; | |
94 | } | |
95 | ||
96 | static const OSSL_DISPATCH p_test_table[] = { | |
97 | { OSSL_FUNC_PROVIDER_GET_PARAM_TYPES, (void (*)(void))p_get_param_types }, | |
98 | { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))p_get_params }, | |
99 | { 0, NULL } | |
100 | }; | |
101 | ||
102 | int OSSL_provider_init(const OSSL_PROVIDER *provider, | |
103 | const OSSL_DISPATCH *in, | |
104 | const OSSL_DISPATCH **out) | |
105 | { | |
106 | for (; in->function_id != 0; in++) { | |
107 | switch (in->function_id) { | |
108 | case OSSL_FUNC_CORE_GET_PARAM_TYPES: | |
109 | c_get_param_types = OSSL_get_core_get_param_types(in); | |
110 | break; | |
111 | case OSSL_FUNC_CORE_GET_PARAMS: | |
112 | c_get_params = OSSL_get_core_get_params(in); | |
113 | break; | |
114 | default: | |
115 | /* Just ignore anything we don't understand */ | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | *out = p_test_table; | |
121 | return 1; | |
122 | } |