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