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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/***************************************************************************//**
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* @file trng_api.c
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2017 Silicon Labs, http://www.silabs.com</b>
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*******************************************************************************
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*
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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"); you may
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* 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, WITHOUT
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* 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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******************************************************************************/
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#include "trng_api.h"
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#include "sl_trng.h"
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#if DEVICE_TRNG
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static bool is_trng_enabled = false;
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void trng_init(trng_t *obj)
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{
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/* Use TRNG0 for all HW entropy collection */
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obj->instance = TRNG0;
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if(!is_trng_enabled) {
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sl_trng_init(obj->instance);
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is_trng_enabled = true;
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}
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}
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void trng_free(trng_t *obj)
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{
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/* Don't turn off the TRNG to avoid clearing its FIFO */
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(void) obj;
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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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int ret = sl_trng_poll(obj->instance,
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output,
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length,
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output_length);
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return (ret == 0) ? 0 : -1;
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}
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#endif /* DEVICE_TRNG */
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