| /* |
| * 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 pseudo-random number generator. |
| * |
| * @warning |
| * This implementation is not a true random number generator and does @em satisfy the Thread requirements. |
| * |
| */ |
| |
| #include <utils/code_utils.h> |
| |
| #include "openthread/platform/random.h" |
| #include "openthread/platform/radio.h" |
| #include "platform-emsk.h" |
| |
| #include <stdlib.h> |
| |
| #include <stdio.h> |
| |
| static unsigned int seed; |
| |
| void emskRandomInit(void) |
| { |
| unsigned int i; |
| |
| printf("Node No.:"); |
| scanf("%d", &i); |
| printf("%d\n", i); |
| seed = 10 + i; |
| srand(seed); |
| } |
| |
| uint32_t otPlatRandomGet(void) |
| { |
| |
| return (uint32_t)rand(); |
| } |
| |
| otError otPlatRandomGetTrue(uint8_t *aOutput, uint16_t aOutputLength) |
| { |
| otError error = OT_ERROR_NONE; |
| uint8_t channel = 0; |
| |
| otEXPECT_ACTION(aOutput && aOutputLength, error = OT_ERROR_INVALID_ARGS); |
| |
| /* disable radio*/ |
| if (otPlatRadioIsEnabled(sInstance)) |
| { |
| channel = (mrf24j40_read_long_ctrl_reg(MRF24J40_RFCON0) >> 4) + 11; |
| otPlatRadioSleep(sInstance); |
| otPlatRadioDisable(sInstance); |
| } |
| |
| /* |
| * THE IMPLEMENTATION BELOW IS NOT COMPLIANT WITH THE THREAD SPECIFICATION. |
| * |
| * Please see Note in `<path-to-openthread>/examples/platforms/emsk/README.md` |
| * for TRNG features on EMSK. |
| */ |
| otEXPECT_ACTION(aOutput && aOutputLength, error = OT_ERROR_INVALID_ARGS); |
| |
| for (uint16_t length = 0; length < aOutputLength; length++) |
| { |
| /* Get random number */ |
| aOutput[length] = (uint8_t)otPlatRandomGet(); |
| } |
| |
| /* Enable radio*/ |
| if (channel) |
| { |
| emskRadioInit(); |
| otPlatRadioEnable(sInstance); |
| otPlatRadioReceive(sInstance, channel); |
| } |
| |
| exit: |
| return error; |
| } |