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49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
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* Copyright (c) 2017-2018 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 "tztrng.h"
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#define BITS_PER_BYTE 8
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void trng_init(trng_t *obj)
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{
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/* Initialization is made in the driver */
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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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/* The current implementation only contains a dummy version of TRNG */
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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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uint32_t retval;
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(void)obj;
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/* The TRNG driver expects a number of bits. */
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retval = CC_TrngGetSource(TRNG_BASE, output, output_length,
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length * BITS_PER_BYTE);
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if (retval != 0) {
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return -1;
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}
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return 0;
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}
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