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Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466
mbed-os/targets/TARGET_NUVOTON/TARGET_NUC472/trng_api.c
- Committer:
- kadonotakashi
- Date:
- 2018-10-10
- Revision:
- 0:8fdf9a60065b
File content as of revision 0:8fdf9a60065b:
/* * Hardware entropy collector for NUC472's RNGA * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ #if DEVICE_TRNG #include <stdlib.h> #include <string.h> #include "cmsis.h" #include "us_ticker_api.h" #include "trng_api.h" #include "crypto-misc.h" /* * Get Random number generator. */ #define PRNG_KEY_SIZE (0x20UL) static void trng_get(unsigned char *pConversionData) { uint32_t *p32ConversionData; p32ConversionData = (uint32_t *)pConversionData; PRNG_Open(PRNG_KEY_SIZE_256, 1, us_ticker_read()); crypto_prng_prestart(); PRNG_Start(); crypto_prng_wait(); PRNG_Read(p32ConversionData); } void trng_init(trng_t *obj) { (void)obj; /* Init crypto module */ crypto_init(); PRNG_ENABLE_INT(); } void trng_free(trng_t *obj) { (void)obj; PRNG_DISABLE_INT(); /* Uninit crypto module */ crypto_uninit(); } int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length) { (void)obj; unsigned char tmpBuff[PRNG_KEY_SIZE]; size_t cur_length = 0; while (length >= sizeof(tmpBuff)) { trng_get(output); output += sizeof(tmpBuff); cur_length += sizeof(tmpBuff); length -= sizeof(tmpBuff); } if (length > 0) { trng_get(tmpBuff); memcpy(output, tmpBuff, length); cur_length += length; crypto_zeroize(tmpBuff, sizeof(tmpBuff)); } *output_length = cur_length; return 0; } #endif