Linux kernel mirror (for testing)
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linux
1/*
2 Hardware Random Number Generator
3
4 Please read Documentation/hw_random.txt for details on use.
5
6 ----------------------------------------------------------
7 This software may be used and distributed according to the terms
8 of the GNU General Public License, incorporated herein by reference.
9
10 */
11
12#ifndef LINUX_HWRANDOM_H_
13#define LINUX_HWRANDOM_H_
14
15#include <linux/types.h>
16#include <linux/list.h>
17
18/**
19 * struct hwrng - Hardware Random Number Generator driver
20 * @name: Unique RNG name.
21 * @init: Initialization callback (can be NULL).
22 * @cleanup: Cleanup callback (can be NULL).
23 * @data_present: Callback to determine if data is available
24 * on the RNG. If NULL, it is assumed that
25 * there is always data available. *OBSOLETE*
26 * @data_read: Read data from the RNG device.
27 * Returns the number of lower random bytes in "data".
28 * Must not be NULL. *OBSOLETE*
29 * @read: New API. drivers can fill up to max bytes of data
30 * into the buffer. The buffer is aligned for any type.
31 * @priv: Private data, for use by the RNG driver.
32 * @quality: Estimation of true entropy in RNG's bitstream
33 * (per mill).
34 */
35struct hwrng {
36 const char *name;
37 int (*init)(struct hwrng *rng);
38 void (*cleanup)(struct hwrng *rng);
39 int (*data_present)(struct hwrng *rng, int wait);
40 int (*data_read)(struct hwrng *rng, u32 *data);
41 int (*read)(struct hwrng *rng, void *data, size_t max, bool wait);
42 unsigned long priv;
43 unsigned short quality;
44
45 /* internal. */
46 struct list_head list;
47};
48
49/** Register a new Hardware Random Number Generator driver. */
50extern int hwrng_register(struct hwrng *rng);
51/** Unregister a Hardware Random Number Generator driver. */
52extern void hwrng_unregister(struct hwrng *rng);
53/** Feed random bits into the pool. */
54extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy);
55
56#endif /* LINUX_HWRANDOM_H_ */