1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * Copyright (C) 2022-2024 Jason A. Donenfeld
4 */
5
6 #ifndef _VDSO_GETRANDOM_H
7 #define _VDSO_GETRANDOM_H
8
9 #include <linux/types.h>
10
11 #define CHACHA_KEY_SIZE 32
12 #define CHACHA_BLOCK_SIZE 64
13
14 /**
15 * struct vgetrandom_state - State used by vDS
16 *
17 * @batch: One and a half ChaCha20 blocks
18 *
19 * @key: Key to be used for generating
20 *
21 * @batch_key: Union of the prior two members
22 * ChaCha20 blocks in size, so th
23 * together.
24 *
25 * @generation: Snapshot of @rng_info->generat
26 * the time @key was generated.
27 *
28 * @pos: Offset into @batch of the next
29 *
30 * @in_use: Reentrancy guard for reusing a
31 * due to signal handlers.
32 */
33 struct vgetrandom_state {
34 union {
35 struct {
36 u8 batch[CHACHA_B
37 u32 key[CHACHA_KEY
38 };
39 u8 batch_key[CHAC
40 };
41 u64 generation;
42 u8 pos;
43 bool in_use;
44 };
45
46 /**
47 * __arch_chacha20_blocks_nostack - Generate C
48 * @dst_bytes: Destination buffer to hold @nb
49 * @key: 32-byte input key.
50 * @counter: 8-byte counter, read on input
51 * @nblocks: Number of blocks to generate.
52 *
53 * Generates a given positive number of blocks
54 * to any stack or memory outside of the param
55 * leaking into forked child processes.
56 */
57 extern void __arch_chacha20_blocks_nostack(u8
58
59 /**
60 * __vdso_getrandom - Architecture-specific vD
61 * @buffer: Passed to __cvdso_getr
62 * @len: Passed to __cvdso_getr
63 * @flags: Passed to __cvdso_getr
64 * @opaque_state: Passed to __cvdso_getr
65 * @opaque_len: Passed to __cvdso_getr
66 *
67 * This function is implemented by making a si
68 * documentation may be consulted for more inf
69 *
70 * Returns: The return value of __cvdso_ge
71 */
72 extern ssize_t __vdso_getrandom(void *buffer,
73
74 #endif /* _VDSO_GETRANDOM_H */
75
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.