92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/*
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* Copyright (c) 2023, The OpenThread Authors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* This file implements the OpenThread platform abstraction for random number generator.
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*
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*/
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#include <openthread-core-config.h>
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#include <stddef.h>
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#include <openthread/platform/entropy.h>
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#include "utils/code_utils.h"
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#if OPENTHREAD_CONFIG_CRYPTO_LIB == OPENTHREAD_CONFIG_CRYPTO_LIB_PSA
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#include "security_manager.h"
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void otPlatCryptoRandomInit(void)
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{
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}
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void otPlatCryptoRandomDeinit(void)
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{
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// Intentionally left blank, nothing to deinit
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}
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otError otPlatCryptoRandomGet(uint8_t *aBuffer, uint16_t aSize)
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{
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otError error = OT_ERROR_NONE;
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psa_status_t status;
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status = sl_sec_man_get_random(aBuffer, aSize);
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otEXPECT_ACTION((status == PSA_SUCCESS), error = OT_ERROR_FAILED);
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exit:
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return error;
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}
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#else
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// The mbedtls_hardware_poll() function is meant for internal use by Mbed TLS
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// and is not declared in any external header files. We will therefore declare
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// it as an extern function here.
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extern int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen);
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otError otPlatEntropyGet(uint8_t *aOutput, uint16_t aOutputLength)
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{
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otError error = OT_ERROR_NONE;
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size_t outputLen = 0;
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otEXPECT_ACTION(aOutput, error = OT_ERROR_INVALID_ARGS);
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for (size_t partialLen = 0; outputLen < aOutputLength; outputLen += partialLen)
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{
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const uint16_t remaining = aOutputLength - outputLen;
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partialLen = 0;
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// Non-zero return values for mbedtls_hardware_poll() signify an error has occurred
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otEXPECT_ACTION(0 == mbedtls_hardware_poll(NULL, &aOutput[outputLen], remaining, &partialLen),
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error = OT_ERROR_FAILED);
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}
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exit:
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return error;
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}
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#endif
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