| /* |
| * Copyright (c) 2017, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file implements a random number generator. |
| * |
| */ |
| |
| #include "openthread/platform/random.h" |
| #include "fsl_device_registers.h" |
| #include "fsl_trng.h" |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <utils/code_utils.h> |
| |
| void kw41zRandomInit(void) |
| { |
| trng_config_t config; |
| uint32_t seed; |
| |
| TRNG_GetDefaultConfig(&config); |
| config.frequencyCountLimit.minimum = 0x00000100; |
| config.frequencyCountLimit.maximum = 0x000F0000; |
| config.ringOscDiv = kTRNG_RingOscDiv0; |
| config.entropyDelay = 1200; |
| |
| otEXPECT(TRNG_Init(TRNG0, &config) == kStatus_Success); |
| |
| otEXPECT(TRNG_GetRandomData(TRNG0, &seed, sizeof(seed)) == kStatus_Success); |
| |
| srand(seed); |
| |
| exit: |
| return; |
| } |
| |
| uint32_t otPlatRandomGet(void) |
| { |
| return (uint32_t)rand(); |
| } |
| |
| otError otPlatRandomGetTrue(uint8_t *aOutput, uint16_t aOutputLength) |
| { |
| otError status = OT_ERROR_NONE; |
| |
| otEXPECT_ACTION((aOutput != NULL), status = OT_ERROR_INVALID_ARGS); |
| |
| otEXPECT_ACTION(TRNG_GetRandomData(TRNG0, aOutput, aOutputLength) == kStatus_Success, status = OT_ERROR_FAILED); |
| |
| exit: |
| return status; |
| } |