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mbed library sources. Supersedes mbed-src.

Dependents:   BREAK_SENSOR_LED

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targets/TARGET_NUVOTON/TARGET_NUC472/trng_api.c@163:74e0ce7f98e8, 2017-04-28 (annotated)

Committer:
Anna Bridge
Date:
Fri Apr 28 14:04:18 2017 +0100
Revision:
163:74e0ce7f98e8
Parent:
153:fa9ff456f731
Child:
179:b0033dcd6934
This updates the lib to the mbed lib v141

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /*
<> 149:156823d33999 2 * Hardware entropy collector for NUC472's RNGA
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
<> 149:156823d33999 5 * SPDX-License-Identifier: Apache-2.0
<> 149:156823d33999 6 *
<> 149:156823d33999 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 149:156823d33999 8 * not use this file except in compliance with the License.
<> 149:156823d33999 9 * You may obtain a copy of the License at
<> 149:156823d33999 10 *
<> 149:156823d33999 11 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 12 *
<> 149:156823d33999 13 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 149:156823d33999 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 16 * See the License for the specific language governing permissions and
<> 149:156823d33999 17 * limitations under the License.
<> 149:156823d33999 18 *
<> 149:156823d33999 19 */
<> 149:156823d33999 20
<> 149:156823d33999 21 #if DEVICE_TRNG
<> 149:156823d33999 22
<> 149:156823d33999 23 #include <stdlib.h>
<> 149:156823d33999 24 #include <string.h>
<> 149:156823d33999 25 #include "cmsis.h"
<> 149:156823d33999 26 #include "NUC472_442.h"
<> 149:156823d33999 27 #include "us_ticker_api.h"
<> 149:156823d33999 28 #include "trng_api.h"
<> 149:156823d33999 29
<> 149:156823d33999 30 /*
<> 149:156823d33999 31 * Get Random number generator.
<> 149:156823d33999 32 */
<> 149:156823d33999 33 static volatile int g_PRNG_done;
Anna Bridge 163:74e0ce7f98e8 34 volatile int g_AES_done;
<> 149:156823d33999 35
<> 149:156823d33999 36 void CRYPTO_IRQHandler()
<> 149:156823d33999 37 {
<> 149:156823d33999 38 if (PRNG_GET_INT_FLAG()) {
<> 149:156823d33999 39 g_PRNG_done = 1;
<> 149:156823d33999 40 PRNG_CLR_INT_FLAG();
Anna Bridge 163:74e0ce7f98e8 41 } else if (AES_GET_INT_FLAG()) {
Anna Bridge 163:74e0ce7f98e8 42 g_AES_done = 1;
Anna Bridge 163:74e0ce7f98e8 43 AES_CLR_INT_FLAG();
<> 149:156823d33999 44 }
<> 149:156823d33999 45 }
<> 149:156823d33999 46
<> 149:156823d33999 47 static void trng_get(unsigned char *pConversionData)
<> 149:156823d33999 48 {
<> 149:156823d33999 49 uint32_t *p32ConversionData;
<> 149:156823d33999 50
<> 149:156823d33999 51 p32ConversionData = (uint32_t *)pConversionData;
<> 149:156823d33999 52
<> 149:156823d33999 53 PRNG_Open(PRNG_KEY_SIZE_256, 1, us_ticker_read());
<> 149:156823d33999 54 PRNG_Start();
<> 149:156823d33999 55 while (!g_PRNG_done);
<> 149:156823d33999 56
<> 149:156823d33999 57 PRNG_Read(p32ConversionData);
<> 149:156823d33999 58 }
<> 149:156823d33999 59
<> 149:156823d33999 60 void trng_init(trng_t *obj)
<> 149:156823d33999 61 {
<> 149:156823d33999 62 (void)obj;
<> 149:156823d33999 63 /* Unlock protected registers */
<> 149:156823d33999 64 SYS_UnlockReg();
<> 149:156823d33999 65 /* Enable IP clock */
<> 149:156823d33999 66 CLK_EnableModuleClock(CRPT_MODULE);
<> 149:156823d33999 67
<> 149:156823d33999 68 /* Lock protected registers */
<> 149:156823d33999 69 SYS_LockReg();
<> 149:156823d33999 70
<> 149:156823d33999 71 NVIC_EnableIRQ(CRPT_IRQn);
<> 149:156823d33999 72 PRNG_ENABLE_INT();
<> 149:156823d33999 73 }
<> 149:156823d33999 74
<> 149:156823d33999 75 void trng_free(trng_t *obj)
<> 149:156823d33999 76 {
<> 149:156823d33999 77 (void)obj;
<> 149:156823d33999 78 PRNG_DISABLE_INT();
<> 149:156823d33999 79 NVIC_DisableIRQ(CRPT_IRQn);
<> 149:156823d33999 80 }
<> 149:156823d33999 81
<> 149:156823d33999 82 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
<> 149:156823d33999 83 {
<> 149:156823d33999 84 (void)obj;
<> 149:156823d33999 85
<> 149:156823d33999 86 *output_length = 0;
<> 149:156823d33999 87 if (length < 32) {
<> 149:156823d33999 88 unsigned char tmpBuff[32];
<> 149:156823d33999 89 trng_get(tmpBuff);
<> 149:156823d33999 90 memcpy(output, &tmpBuff, length);
<> 149:156823d33999 91 *output_length = length;
<> 149:156823d33999 92 } else {
Anna Bridge 163:74e0ce7f98e8 93 for (int i = 0; i < (length/32); i++) {
<> 149:156823d33999 94 trng_get(output);
<> 149:156823d33999 95 *output_length += 32;
<> 149:156823d33999 96 output += 32;
<> 149:156823d33999 97 }
<> 149:156823d33999 98 }
<> 149:156823d33999 99
<> 149:156823d33999 100 return 0;
<> 149:156823d33999 101 }
<> 149:156823d33999 102
<> 149:156823d33999 103 #endif
<> 149:156823d33999 104