mirror of https://github.com/ARMmbed/mbed-os.git
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2016 Nuvoton
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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#if DEVICE_TRNG
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#include <stdlib.h>
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#include <string.h>
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#include "cmsis.h"
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#include "us_ticker_api.h"
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#include "trng_api.h"
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/*
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* Get Random number generator.
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*/
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static volatile int g_PRNG_done;
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volatile int g_AES_done;
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void CRYPTO_IRQHandler()
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{
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if (PRNG_GET_INT_FLAG()) {
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g_PRNG_done = 1;
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PRNG_CLR_INT_FLAG();
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} else if (AES_GET_INT_FLAG()) {
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g_AES_done = 1;
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AES_CLR_INT_FLAG();
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}
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}
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static void trng_get(unsigned char *pConversionData)
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{
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uint32_t *p32ConversionData;
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p32ConversionData = (uint32_t *)pConversionData;
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PRNG_Open(PRNG_KEY_SIZE_256, 1, us_ticker_read());
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PRNG_Start();
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while (!g_PRNG_done);
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PRNG_Read(p32ConversionData);
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}
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void trng_init(trng_t *obj)
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{
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(void)obj;
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/* Unlock protected registers */
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SYS_UnlockReg();
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/* Enable IP clock */
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CLK_EnableModuleClock(CRPT_MODULE);
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/* Lock protected registers */
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SYS_LockReg();
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NVIC_EnableIRQ(CRPT_IRQn);
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PRNG_ENABLE_INT();
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}
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void trng_free(trng_t *obj)
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{
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(void)obj;
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PRNG_DISABLE_INT();
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NVIC_DisableIRQ(CRPT_IRQn);
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}
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int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
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{
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(void)obj;
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*output_length = 0;
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if (length < 32) {
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unsigned char tmpBuff[32];
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trng_get(tmpBuff);
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memcpy(output, &tmpBuff, length);
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*output_length = length;
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} else {
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for (unsigned i = 0; i < (length/32); i++) {
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trng_get(output);
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*output_length += 32;
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output += 32;
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}
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}
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return 0;
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}
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#endif
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