1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** NetX Secure Component */
17 /** */
18 /** Transport Layer Security (TLS) */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define NX_SECURE_SOURCE_CODE
24
25
26 /* Include necessary system files. */
27
28 #include "nx_secure_tls.h"
29
30 #ifndef NX_SECURE_RNG_CHECK_COUNT
31 #define NX_SECURE_RNG_CHECK_COUNT 3
32 #endif /* NX_SECURE_RNG_CHECK_COUNT */
33
34 UINT _nx_secure_crypto_rng_self_test(VOID);
35
36 /**************************************************************************/
37 /* */
38 /* FUNCTION RELEASE */
39 /* */
40 /* _nx_secure_crypto_rng_self_test PORTABLE C */
41 /* 6.1.5 */
42 /* AUTHOR */
43 /* */
44 /* Timothy Stapko, Microsoft Corporation */
45 /* */
46 /* DESCRIPTION */
47 /* */
48 /* This function runs the simple random number generator test to make */
49 /* sure the numbers generated are unique. */
50 /* */
51 /* INPUT */
52 /* */
53 /* None */
54 /* */
55 /* OUTPUT */
56 /* */
57 /* status Completion status */
58 /* */
59 /* CALLS */
60 /* */
61 /* None */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* Application Code */
66 /* */
67 /* RELEASE HISTORY */
68 /* */
69 /* DATE NAME DESCRIPTION */
70 /* */
71 /* 05-19-2020 Timothy Stapko Initial Version 6.0 */
72 /* 09-30-2020 Timothy Stapko Modified comment(s), */
73 /* resulting in version 6.1 */
74 /* 03-02-2021 Yuxin Zhou Modified comment(s), and */
75 /* fixed compiler warnings, */
76 /* resulting in version 6.1.5 */
77 /* */
78 /**************************************************************************/
_nx_secure_crypto_rng_self_test(VOID)79 UINT _nx_secure_crypto_rng_self_test(VOID)
80 {
81 #ifdef NX_SECURE_POWER_ON_SELF_TEST_MODULE_INTEGRITY_CHECK
82 UINT results[NX_SECURE_RNG_CHECK_COUNT];
83 UINT i, j;
84
85 for (i = 0; i < NX_SECURE_RNG_CHECK_COUNT; i++)
86 {
87 results[i] = (UINT)NX_RAND();
88
89 /* Make sure the random number is unique. */
90 for (j = 0; j < i; j++)
91 {
92 if (results[i] == results[j])
93 {
94
95 /* Found duplicated random number. */
96 return(1);
97 }
98 }
99 }
100
101 /* All random numbers generated are unique. */
102 return(0);
103 #else
104 return(0);
105 #endif
106 }
107
