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