89 lines
3.5 KiB
C
89 lines
3.5 KiB
C
/*
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* Copyright (c) 2018, Texas Instruments Incorporated - http://www.ti.com/
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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
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* 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 names of its
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* contributors may be used to endorse or promote products derived
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* 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
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* 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
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc13xx-cc26xx-trng
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* @{
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*
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* \file
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* Implementation of True Random Number Generator for CC13xx/CC26xx.
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* \author
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* Edvard Pettersen <e.pettersen@ti.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "trng-arch.h"
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/*---------------------------------------------------------------------------*/
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#include <ti/drivers/TRNG.h>
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#include <ti/drivers/cryptoutils/cryptokey/CryptoKeyPlaintext.h>
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/*---------------------------------------------------------------------------*/
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/*
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* Very dirty workaround because the pre-compiled TI drivers library for
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* CC13x0/CC26x0 is missing the CryptoKey object file. This can be removed
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* when the pre-compiled library includes the missing object file.
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*/
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#include <ti/devices/DeviceFamily.h>
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#if (DeviceFamily_PARENT == DeviceFamily_PARENT_CC13X0_CC26X0)
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#include <ti/drivers/cryptoutils/cryptokey/CryptoKeyPlaintextCC26XX.c>
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#endif
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/*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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bool
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trng_rand(uint8_t *entropy_buf, size_t entropy_len, uint32_t timeout_us)
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{
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TRNG_Params trng_params;
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TRNG_Handle trng_handle;
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CryptoKey entropy_key;
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int_fast16_t result;
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TRNG_Params_init(&trng_params);
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trng_params.returnBehavior = TRNG_RETURN_BEHAVIOR_BLOCKING;
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if(timeout_us != TRNG_WAIT_FOREVER) {
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trng_params.timeout = timeout_us;
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}
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trng_handle = TRNG_open(0, &trng_params);
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if(!trng_handle) {
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return false;
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}
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CryptoKeyPlaintext_initBlankKey(&entropy_key, entropy_buf, entropy_len);
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result = TRNG_generateEntropy(trng_handle, &entropy_key);
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TRNG_close(trng_handle);
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return result == TRNG_STATUS_SUCCESS;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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