ra2_crypto_trng.c
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1 /**
2  * @file ra2_crypto_trng.c
3  * @brief RA2 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 "hw_sce_trng_private.h"
36 #include "core/crypto.h"
39 #include "debug.h"
40 
41 //Check crypto library configuration
42 #if (RA2_CRYPTO_TRNG_SUPPORT == ENABLED)
43 
44 
45 /**
46  * @brief Get random data from the TRNG module
47  * @param[out] data Buffer where to store random data
48  * @param[in] length Number of random bytes to generate
49  **/
50 
52 {
53  size_t i;
54  size_t j;
55  uint32_t value[4];
56  fsp_err_t status;
57 
58  //Acquire exclusive access to the SCE module
60 
61  //Generate random data
62  for(i = 0; i < length; i++)
63  {
64  //Generate a new 128-bit random value when necessary
65  if((i % 16) == 0)
66  {
67  //Get 128-bit random value
68  status = HW_SCE_RNG_Read(value);
69  //Check status code
70  if(status != FSP_SUCCESS)
71  {
72  break;
73  }
74  }
75 
76  //Extract a random byte
77  j = (i % 16) / 4;
78 
79  //Copy random byte
80  data[i] = value[j] & 0xFF;
81  //Shift the 32-bit random value
82  value[j] >>= 8;
83  }
84 
85  //Release exclusive access to the SCE module
87 
88  //Return status code
89  return (status == FSP_SUCCESS) ? NO_ERROR : ERROR_FAILURE;
90 }
91 
92 #endif
General definitions for cryptographic algorithms.
Debugging facilities.
error_t
Error codes.
Definition: error.h:43
@ NO_ERROR
Success.
Definition: error.h:44
@ ERROR_FAILURE
Generic error code.
Definition: error.h:45
uint8_t data[]
Definition: ethernet.h:222
void osAcquireMutex(OsMutex *mutex)
Acquire ownership of the specified mutex object.
void osReleaseMutex(OsMutex *mutex)
Release ownership of the specified mutex object.
OsMutex ra2CryptoMutex
Definition: ra2_crypto.c:41
RA2 hardware cryptographic accelerator (SCE)
error_t trngGetRandomData(uint8_t *data, size_t length)
Get random data from the TRNG module.
RA2 true random number generator.
uint8_t length
Definition: tcp.h:368
uint8_t value[]
Definition: tcp.h:369