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author | Pauli <ppzgs1@gmail.com> | 2021-02-17 11:54:01 +1000 |
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committer | Pauli <ppzgs1@gmail.com> | 2021-02-23 23:24:41 +1000 |
commit | b3ab537b3a4098857d2039d1d745fee0ea5a96e3 (patch) | |
tree | bbb444f1340ff92dd95bae34bc1f37ff5e4eec56 /test/testutil/fake_random.c | |
parent | 9c6ee56318d2fb1c5885fccb4f2c4dde83e8a2ea (diff) | |
download | openssl-b3ab537b3a4098857d2039d1d745fee0ea5a96e3.zip openssl-b3ab537b3a4098857d2039d1d745fee0ea5a96e3.tar.gz openssl-b3ab537b3a4098857d2039d1d745fee0ea5a96e3.tar.bz2 |
test: add framework for generic fake random number generator
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13652)
Diffstat (limited to 'test/testutil/fake_random.c')
-rw-r--r-- | test/testutil/fake_random.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/test/testutil/fake_random.c b/test/testutil/fake_random.c new file mode 100644 index 0000000..95a3023 --- /dev/null +++ b/test/testutil/fake_random.c @@ -0,0 +1,192 @@ +/* + * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * https://www.openssl.org/source/license.html + * or in the file LICENSE in the source distribution. + */ + +#include <string.h> +#include <openssl/core_names.h> +#include <openssl/rand.h> +#include <openssl/provider.h> +#include "../testutil.h" + +typedef struct { + int (*cb)(unsigned char *out, size_t outlen); + int state; +} FAKE_RAND; + +static FAKE_RAND fake_rand; + +static OSSL_FUNC_rand_newctx_fn fake_rand_newctx; +static OSSL_FUNC_rand_freectx_fn fake_rand_freectx; +static OSSL_FUNC_rand_instantiate_fn fake_rand_instantiate; +static OSSL_FUNC_rand_uninstantiate_fn fake_rand_uninstantiate; +static OSSL_FUNC_rand_generate_fn fake_rand_generate; +static OSSL_FUNC_rand_gettable_ctx_params_fn fake_rand_gettable_ctx_params; +static OSSL_FUNC_rand_get_ctx_params_fn fake_rand_get_ctx_params; +static OSSL_FUNC_rand_enable_locking_fn fake_rand_enable_locking; + +static void *fake_rand_newctx(void *provctx, void *parent, + const OSSL_DISPATCH *parent_dispatch) +{ + fake_rand.cb = NULL; + fake_rand.state = EVP_RAND_STATE_UNINITIALISED; + return &fake_rand; +} + +static void fake_rand_freectx(void *vrng) +{ + FAKE_RAND *frng = (FAKE_RAND *)vrng; + + frng->cb = NULL; + frng->state = EVP_RAND_STATE_UNINITIALISED; +} + +static int fake_rand_instantiate(void *vrng, ossl_unused unsigned int strength, + ossl_unused int prediction_resistance, + ossl_unused const unsigned char *pstr, + size_t pstr_len) +{ + FAKE_RAND *frng = (FAKE_RAND *)vrng; + + frng->state = EVP_RAND_STATE_READY; + return 1; +} + +static int fake_rand_uninstantiate(void *vrng) +{ + FAKE_RAND *frng = (FAKE_RAND *)vrng; + + frng->state = EVP_RAND_STATE_UNINITIALISED; + return 1; +} + +static int fake_rand_generate(void *vrng, unsigned char *out, size_t outlen, + unsigned int strength, int prediction_resistance, + const unsigned char *adin, size_t adinlen) +{ + FAKE_RAND *frng = (FAKE_RAND *)vrng; + size_t l; + uint32_t r; + + if (frng->cb != NULL) + return (*frng->cb)(out, outlen); + while (outlen > 0) { + r = test_random(); + l = outlen < sizeof(r) ? outlen : sizeof(r); + + memcpy(out, &r, l); + out += l; + outlen -= l; + } + return 1; +} + +static int fake_rand_enable_locking(void *vrng) +{ + return 1; +} + +static int fake_rand_get_ctx_params(ossl_unused void *vrng, OSSL_PARAM params[]) +{ + FAKE_RAND *frng = (FAKE_RAND *)vrng; + OSSL_PARAM *p; + + p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STATE); + if (p != NULL && !OSSL_PARAM_set_int(p, frng->state)) + return 0; + + p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STRENGTH); + if (p != NULL && !OSSL_PARAM_set_int(p, 256)) + return 0; + + p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_MAX_REQUEST); + if (p != NULL && !OSSL_PARAM_set_size_t(p, INT_MAX)) + return 0; + return 1; +} + +static const OSSL_PARAM *fake_rand_gettable_ctx_params(void *vrng) +{ + static const OSSL_PARAM known_gettable_ctx_params[] = { + OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL), + OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL), + OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL), + OSSL_PARAM_END + }; + return known_gettable_ctx_params; +} + +static const OSSL_DISPATCH fake_rand_functions[] = { + { OSSL_FUNC_RAND_NEWCTX, (void (*)(void))fake_rand_newctx }, + { OSSL_FUNC_RAND_FREECTX, (void (*)(void))fake_rand_freectx }, + { OSSL_FUNC_RAND_INSTANTIATE, (void (*)(void))fake_rand_instantiate }, + { OSSL_FUNC_RAND_UNINSTANTIATE, (void (*)(void))fake_rand_uninstantiate }, + { OSSL_FUNC_RAND_GENERATE, (void (*)(void))fake_rand_generate }, + { OSSL_FUNC_RAND_ENABLE_LOCKING, (void (*)(void))fake_rand_enable_locking }, + { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS, + (void(*)(void))fake_rand_gettable_ctx_params }, + { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))fake_rand_get_ctx_params }, + { 0, NULL } +}; + +static const OSSL_ALGORITHM fake_rand_rand[] = { + { "FAKE", "provider=fake", fake_rand_functions }, + { NULL, NULL, NULL } +}; + +static const OSSL_ALGORITHM *fake_rand_query(void *provctx, + int operation_id, + int *no_cache) +{ + *no_cache = 0; + switch (operation_id) { + case OSSL_OP_RAND: + return fake_rand_rand; + } + return NULL; +} + +/* Functions we provide to the core */ +static const OSSL_DISPATCH fake_rand_method[] = { + { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))OSSL_LIB_CTX_free }, + { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))fake_rand_query }, + { 0, NULL } +}; + +static int fake_rand_provider_init(const OSSL_CORE_HANDLE *handle, + const OSSL_DISPATCH *in, + const OSSL_DISPATCH **out, void **provctx) +{ + if (!TEST_ptr(*provctx = OSSL_LIB_CTX_new())) + return 0; + *out = fake_rand_method; + return 1; +} + +OSSL_PROVIDER *fake_rand_start(OSSL_LIB_CTX *libctx) +{ + OSSL_PROVIDER *p; + + if (!TEST_true(OSSL_PROVIDER_add_builtin(libctx, "fake-rand", + fake_rand_provider_init)) + || !TEST_true(RAND_set_DRBG_type(libctx, "fake", NULL, NULL, NULL)) + || !TEST_ptr(p = OSSL_PROVIDER_try_load(libctx, "fake-rand", 1))) + return NULL; + return p; +} + +void fake_rand_finish(OSSL_PROVIDER *p) +{ + OSSL_PROVIDER_unload(p); +} + +void fake_rand_set_callback(int (*cb)(unsigned char *out, size_t outlen)) +{ + fake_rand.cb = cb; +} + |