1 /*
2  * Copyright (c) 2021 Google, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining
5  * a copy of this software and associated documentation files
6  * (the "Software"), to deal in the Software without restriction,
7  * including without limitation the rights to use, copy, modify, merge,
8  * publish, distribute, sublicense, and/or sell copies of the Software,
9  * and to permit persons to whom the Software is furnished to do so,
10  * subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be
13  * included in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22  */
23 
24 #pragma once
25 
26 #include <sys/types.h>
27 #include <compiler.h>
28 
29 __BEGIN_CDECLS;
30 
31 /**
32  * platform_random_get_bytes() - Read bytes from random number source.
33  * @buf: Buffer to receive the random bytes.
34  * @len: How many bytes to put in the buffer.
35  *
36  * Reads "len" bytes from a random number source and stores them in "buf".
37  *
38  * Context: Can be called during early startup when interrupts are disabled
39  *          or the scheduler is not started yet.
40  */
41 void platform_random_get_bytes(uint8_t *buf, size_t len);
42 
43 __END_CDECLS;
44