lpc54xxx_crypto_trng.c
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1 /**
2  * @file lpc54xxx_crypto_trng.c
3  * @brief LPC54000 true random number generator
4  *
5  * @section License
6  *
7  * SPDX-License-Identifier: GPL-2.0-or-later
8  *
9  * Copyright (C) 2010-2024 Oryx Embedded SARL. All rights reserved.
10  *
11  * This file is part of CycloneCRYPTO Open.
12  *
13  * This program is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU General Public License
15  * as published by the Free Software Foundation; either version 2
16  * of the License, or (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software Foundation,
25  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26  *
27  * @author Oryx Embedded SARL (www.oryx-embedded.com)
28  * @version 2.4.0
29  **/
30 
31 //Switch to the appropriate trace level
32 #define TRACE_LEVEL CRYPTO_TRACE_LEVEL
33 
34 //Dependencies
35 #include "fsl_device_registers.h"
36 #include "fsl_rng.h"
37 #include "core/crypto.h"
40 #include "debug.h"
41 
42 //Check crypto library configuration
43 #if (LPC54XXX_CRYPTO_TRNG_SUPPORT == ENABLED)
44 
45 
46 /**
47  * @brief TRNG module initialization
48  * @return Error code
49  **/
50 
52 {
53  //Enable RNG peripheral clock
54  CLOCK_EnableClock(kCLOCK_Rng);
55  //Reset RNG module
56  RESET_PeripheralReset(kRNG_RST_SHIFT_RSTn);
57 
58  //Successful initialization
59  return NO_ERROR;
60 }
61 
62 
63 /**
64  * @brief Get random data from the TRNG module
65  * @param[out] data Buffer where to store random data
66  * @param[in] length Number of random bytes to generate
67  **/
68 
70 {
71  size_t i;
72  uint32_t value;
73 
74  //Acquire exclusive access to the RNG module
76 
77  //Generate random data
78  for(i = 0; i < length; i++)
79  {
80  //Generate a new 32-bit random value when necessary
81  if((i % 4) == 0)
82  {
83  //Get the 32-bit random value
84  value = RNG_GetRandomData();
85  }
86 
87  //Copy random byte
88  data[i] = value & 0xFF;
89  //Shift the 32-bit random value
90  value >>= 8;
91  }
92 
93  //Release exclusive access to the RNG module
95 
96  //Successful processing
97  return NO_ERROR;
98 }
99 
100 #endif
General definitions for cryptographic algorithms.
Debugging facilities.
error_t
Error codes.
Definition: error.h:43
@ NO_ERROR
Success.
Definition: error.h:44
uint8_t data[]
Definition: ethernet.h:222
OsMutex lpc54xxxCryptoMutex
LPC54000 hardware cryptographic accelerator.
error_t trngGetRandomData(uint8_t *data, size_t length)
Get random data from the TRNG module.
error_t trngInit(void)
TRNG module initialization.
LPC54000 true random number generator.
void osAcquireMutex(OsMutex *mutex)
Acquire ownership of the specified mutex object.
void osReleaseMutex(OsMutex *mutex)
Release ownership of the specified mutex object.
uint8_t length
Definition: tcp.h:368
uint8_t value[]
Definition: tcp.h:369