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66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
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* Copyright (C) 2020 HAW Hamburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup pkg_mbedtls_entropy
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*
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* @{
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* @file
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*
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* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
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*
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* @}
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*/
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#include <assert.h>
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#include "mbedtls/entropy.h"
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#include "entropy_sources_mbedtls_riot.h"
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#include "entropy_mbedtls_riot.h"
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/* Internal mbedtls entropy context for convenience functions */
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static mbedtls_entropy_context ctx;
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int entropy_mbedtls_riot_init(void)
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{
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mbedtls_entropy_init(&ctx);
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return riot_add_entropy_src_avail(&ctx);
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}
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int entropy_mbedtls_riot_retrieve(unsigned char *output, size_t len)
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{
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assert(output != NULL);
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return mbedtls_entropy_func(&ctx, output, len);
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}
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void entropy_mbedtls_riot_uninit(void)
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{
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mbedtls_entropy_free(&ctx);
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}
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int entropy_mbedtls_riot_get(unsigned char *output, size_t len)
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{
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assert(output != NULL);
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int ret = 0;
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if ((ret = entropy_mbedtls_riot_init()) < 0) {
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entropy_mbedtls_riot_uninit();
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return ret;
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}
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ret = entropy_mbedtls_riot_retrieve(output, len);
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/* Always uninitialize at the end */
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entropy_mbedtls_riot_uninit();
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return ret;
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}
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