2 * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
11 #include <openssl/core_names.h>
12 #include <openssl/rand.h>
13 #include <openssl/provider.h>
16 static OSSL_FUNC_rand_newctx_fn fuzz_rand_newctx;
17 static OSSL_FUNC_rand_freectx_fn fuzz_rand_freectx;
18 static OSSL_FUNC_rand_instantiate_fn fuzz_rand_instantiate;
19 static OSSL_FUNC_rand_uninstantiate_fn fuzz_rand_uninstantiate;
20 static OSSL_FUNC_rand_generate_fn fuzz_rand_generate;
21 static OSSL_FUNC_rand_gettable_ctx_params_fn fuzz_rand_gettable_ctx_params;
22 static OSSL_FUNC_rand_get_ctx_params_fn fuzz_rand_get_ctx_params;
23 static OSSL_FUNC_rand_enable_locking_fn fuzz_rand_enable_locking;
25 static void *fuzz_rand_newctx(
26 void *provctx, void *parent, const OSSL_DISPATCH *parent_dispatch)
28 int *st = OPENSSL_malloc(sizeof(*st));
31 *st = EVP_RAND_STATE_UNINITIALISED;
35 static void fuzz_rand_freectx(ossl_unused void *vrng)
40 static int fuzz_rand_instantiate(ossl_unused void *vrng,
41 ossl_unused unsigned int strength,
42 ossl_unused int prediction_resistance,
43 ossl_unused const unsigned char *pstr,
44 ossl_unused size_t pstr_len)
46 *(int *)vrng = EVP_RAND_STATE_READY;
50 static int fuzz_rand_uninstantiate(ossl_unused void *vrng)
52 *(int *)vrng = EVP_RAND_STATE_UNINITIALISED;
56 static int fuzz_rand_generate(ossl_unused void *vdrbg,
57 unsigned char *out, size_t outlen,
58 ossl_unused unsigned int strength,
59 ossl_unused int prediction_resistance,
60 ossl_unused const unsigned char *adin,
61 ossl_unused size_t adinlen)
63 unsigned char val = 1;
66 for (i = 0; i < outlen; i++)
71 static int fuzz_rand_enable_locking(ossl_unused void *vrng)
76 static int fuzz_rand_get_ctx_params(void *vrng, OSSL_PARAM params[])
80 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STATE);
81 if (p != NULL && !OSSL_PARAM_set_int(p, *(int *)vrng))
84 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STRENGTH);
85 if (p != NULL && !OSSL_PARAM_set_int(p, 500))
88 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_MAX_REQUEST);
89 if (p != NULL && !OSSL_PARAM_set_size_t(p, INT_MAX))
94 static const OSSL_PARAM *fuzz_rand_gettable_ctx_params(ossl_unused void *vrng,
95 ossl_unused void *provctx)
97 static const OSSL_PARAM known_gettable_ctx_params[] = {
98 OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL),
99 OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),
100 OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),
103 return known_gettable_ctx_params;
106 static const OSSL_DISPATCH fuzz_rand_functions[] = {
107 { OSSL_FUNC_RAND_NEWCTX, (void (*)(void))fuzz_rand_newctx },
108 { OSSL_FUNC_RAND_FREECTX, (void (*)(void))fuzz_rand_freectx },
109 { OSSL_FUNC_RAND_INSTANTIATE, (void (*)(void))fuzz_rand_instantiate },
110 { OSSL_FUNC_RAND_UNINSTANTIATE, (void (*)(void))fuzz_rand_uninstantiate },
111 { OSSL_FUNC_RAND_GENERATE, (void (*)(void))fuzz_rand_generate },
112 { OSSL_FUNC_RAND_ENABLE_LOCKING, (void (*)(void))fuzz_rand_enable_locking },
113 { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
114 (void(*)(void))fuzz_rand_gettable_ctx_params },
115 { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))fuzz_rand_get_ctx_params },
119 static const OSSL_ALGORITHM fuzz_rand_rand[] = {
120 { "fuzz", "provider=fuzz-rand", fuzz_rand_functions },
124 static const OSSL_ALGORITHM *fuzz_rand_query(void *provctx,
129 switch (operation_id) {
131 return fuzz_rand_rand;
136 /* Functions we provide to the core */
137 static const OSSL_DISPATCH fuzz_rand_method[] = {
138 { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))OSSL_LIB_CTX_free },
139 { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))fuzz_rand_query },
143 static int fuzz_rand_provider_init(const OSSL_CORE_HANDLE *handle,
144 const OSSL_DISPATCH *in,
145 const OSSL_DISPATCH **out, void **provctx)
147 *provctx = OSSL_LIB_CTX_new();
148 *out = fuzz_rand_method;
152 static OSSL_PROVIDER *r_prov;
154 void FuzzerSetRand(void)
156 if (!OSSL_PROVIDER_add_builtin(NULL, "fuzz-rand", fuzz_rand_provider_init)
157 || !RAND_set_DRBG_type(NULL, "fuzz", NULL, NULL, NULL)
158 || (r_prov = OSSL_PROVIDER_try_load(NULL, "fuzz-rand", 1)) == NULL)
162 void FuzzerClearRand(void)
164 OSSL_PROVIDER_unload(r_prov);