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81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
4 years ago
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/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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* **** This file incorporates work covered by the following copyright and ****
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* **** permission notice: ****
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*
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* Copyright (C) 2006-2017 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*
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*/
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#include <ch.h>
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#include <stdint.h>
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#include "wolfssl_chibios.h"
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#include "user_settings.h"
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unsigned int chibios_rand_generate(void)
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{
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static unsigned int last_value=0;
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static unsigned int new_value=0;
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unsigned int error_bits = 0;
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error_bits = RNG_SR_SEIS | RNG_SR_CEIS;
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while (new_value==last_value) {
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/* Check for error flags and if data is ready. */
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if ( ((RNG->SR & error_bits) == 0) && ( (RNG->SR & RNG_SR_DRDY) == 1 ) )
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new_value=RNG->DR;
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}
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last_value=new_value;
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return new_value;
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}
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int custom_rand_generate_block(unsigned char* output, unsigned int sz)
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{
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uint32_t i = 0;
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while (i < sz)
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{
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/* If not aligned or there is odd/remainder */
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if( (i + sizeof(CUSTOM_RAND_TYPE)) > sz ||
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((uint32_t)&output[i] % sizeof(CUSTOM_RAND_TYPE)) != 0
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) {
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/* Single byte at a time */
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output[i++] = (unsigned char)chibios_rand_generate();
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}
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else {
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/* Use native 8, 16, 32 or 64 copy instruction */
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*((CUSTOM_RAND_TYPE*)&output[i]) = chibios_rand_generate();
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i += sizeof(CUSTOM_RAND_TYPE);
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}
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}
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return 0;
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}
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