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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Mock TRNG driver for unit test.
*
* Although a TRNG is designed to be anything but predictable,
* this implementation strives to be as predictable and defined
* as possible to allow reproducing unit tests and fuzzer crashes.
*/
#ifndef TEST_BUILD
#error "This fake trng driver must not be used in non-test builds."
#endif
#include "common.h"
#include <stdint.h>
#include <stdlib.h> /* Only valid for host */
static unsigned int seed;
test_mockable void trng_init(void)
{
seed = 0;
srand(seed);
}
test_mockable void trng_exit(void)
{
}
test_mockable uint32_t trng_rand(void)
{
return (uint32_t)rand_r(&seed);
}
test_mockable void trng_rand_bytes(void *buffer, size_t len)
{
uint8_t *b, *end;
for (b = buffer, end = b + len; b != end; b++)
*b = (uint8_t)rand_r(&seed);
}
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