| 1 | |
| 2 | * include/linux/random.h
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| 3 | *
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| 4 | * Include file for the random number generator.
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| 5 |
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| 6 | #ifndef _LINUX_RANDOM_H
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| 7 | #define _LINUX_RANDOM_H
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| 8 |
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| 9 | #include <uapi/linux/random.h>
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| 10 |
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| 11 |
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| 12 | extern void add_device_randomness(const void *, unsigned int);
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| 13 | extern void add_input_randomness(unsigned int type, unsigned int code,
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| 14 | unsigned int value);
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| 15 | extern void add_interrupt_randomness(int irq, int irq_flags);
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| 16 |
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| 17 | extern void get_random_bytes(void *buf, int nbytes);
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| 18 | extern void get_random_bytes_arch(void *buf, int nbytes);
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| 19 | void generate_random_uuid(unsigned char uuid_out[16]);
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| 20 |
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| 21 | #ifndef MODULE
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| 22 | extern const struct file_operations random_fops, urandom_fops;
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| 23 | #endif
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| 24 |
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| 25 | unsigned int get_random_int(void);
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| 26 | unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
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| 27 |
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| 28 | u32 prandom_u32(void);
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| 29 | void prandom_bytes(void *buf, int nbytes);
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| 30 | void prandom_seed(u32 seed);
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| 31 |
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| 32 | |
| 33 | * These macros are preserved for backward compatibility and should be
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| 34 | * removed as soon as a transition is finished.
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| 35 |
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| 36 | #define random32() prandom_u32()
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| 37 | #define srandom32(seed) prandom_seed(seed)
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| 38 |
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| 39 | u32 prandom_u32_state(struct rnd_state *);
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| 40 | void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
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| 41 |
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| 42 | |
| 43 | * Handle minimum values for seeds
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| 44 |
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| 45 | static inline u32 __seed(u32 x, u32 m)
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| 46 | {
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| 47 | return (x < m) ? x + m : x;
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| 48 | }
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| 49 |
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| 50 | |
| 51 | * prandom_seed_state - set seed for prandom_u32_state().
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| 52 | * @state: pointer to state structure to receive the seed.
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| 53 | * @seed: arbitrary 64-bit value to use as a seed.
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| 54 |
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| 55 | static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
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| 56 | {
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| 57 | u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
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| 58 |
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| 59 | state->s1 = __seed(i, 1);
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| 60 | state->s2 = __seed(i, 7);
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| 61 | state->s3 = __seed(i, 15);
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| 62 | }
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| 63 |
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| 64 | #ifdef CONFIG_ARCH_RANDOM
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| 65 | # include <asm/archrandom.h>
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| 66 | #else
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| 67 | static inline int arch_get_random_long(unsigned long *v)
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| 68 | {
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| 69 | return 0;
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| 70 | }
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| 71 | static inline int arch_get_random_int(unsigned int *v)
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| 72 | {
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| 73 | return 0;
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| 74 | }
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| 75 | #endif
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| 76 |
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| 77 |
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| 78 | static inline u32 next_pseudo_random32(u32 seed)
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| 79 | {
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| 80 | return seed * 1664525 + 1013904223;
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| 81 | }
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| 82 |
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| 83 | #endif
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