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