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 /* 33 * These macros are preserved for backward compatibility and should be 34 * removed as soon as a transition is finished. 35 */ 36 #define random32() prandom_u32() 37 #define srandom32(seed) prandom_seed(seed) 38 39 u32 prandom_u32_state(struct rnd_state *); 40 void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes); 41 42 /* 43 * Handle minimum values for seeds 44 */ 45 static inline u32 __seed(u32 x, u32 m) 46 { 47 return (x < m) ? x + m : x; 48 } 49 50 /** 51 * prandom_seed_state - set seed for prandom_u32_state(). 52 * @state: pointer to state structure to receive the seed. 53 * @seed: arbitrary 64-bit value to use as a seed. 54 */ 55 static inline void prandom_seed_state(struct rnd_state *state, u64 seed) 56 { 57 u32 i = (seed >> 32) ^ (seed << 10) ^ seed; 58 59 state->s1 = __seed(i, 1); 60 state->s2 = __seed(i, 7); 61 state->s3 = __seed(i, 15); 62 } 63 64 #ifdef CONFIG_ARCH_RANDOM 65 # include <asm/archrandom.h> 66 #else 67 static inline int arch_get_random_long(unsigned long *v) 68 { 69 return 0; 70 } 71 static inline int arch_get_random_int(unsigned int *v) 72 { 73 return 0; 74 } 75 #endif 76 77 #endif /* _LINUX_RANDOM_H */ 78