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/*
* 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;
/* Ensure that the fake rand is initialized. */
if (!TEST_ptr(RAND_get0_private(libctx))
|| !TEST_ptr(RAND_get0_public(libctx))) {
OSSL_PROVIDER_unload(p);
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;
}
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