mirror of https://github.com/ARMmbed/mbed-os.git
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* Copyright (c) 2017-2019 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "trng_api.h"
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#include "device.h"
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#include <stdlib.h>
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/** NOTE: FastModel are software models not contain any TRNG peripheral
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* So C library srand() and rand() are used to simulate TRNG device
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*/
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void trng_init(trng_t *obj)
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{
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srand(0);
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(void)obj;
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}
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void trng_free(trng_t *obj)
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{
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(void)obj;
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}
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/** Get random data from TRNG peripheral
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*
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* @param obj The TRNG object
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* @param output The pointer to an output array
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* @param length The size of output data, to avoid buffer overwrite
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* @param output_length The length of generated data
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* @return 0 success, -1 fail
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*/
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int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
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{
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(void)obj;
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for (int i = 0; i < length; ++i) {
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output[i] = rand() % 256;
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}
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*output_length = length;
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return 0;
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}
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