| /* |
| * include/linux/random.h |
| * |
| * Include file for the random number generator. |
| */ |
| |
| #ifndef _LINUX_RANDOM_H |
| #define _LINUX_RANDOM_H |
| |
| #include <linux/types.h> |
| #include <linux/ioctl.h> |
| #include <linux/irqnr.h> |
| |
| /* ioctl()'s for the random number generator */ |
| |
| /* Get the entropy count. */ |
| #define RNDGETENTCNT _IOR( 'R', 0x00, int ) |
| |
| /* Add to (or subtract from) the entropy count. (Superuser only.) */ |
| #define RNDADDTOENTCNT _IOW( 'R', 0x01, int ) |
| |
| /* Get the contents of the entropy pool. (Superuser only.) */ |
| #define RNDGETPOOL _IOR( 'R', 0x02, int [2] ) |
| |
| /* |
| * Write bytes into the entropy pool and add to the entropy count. |
| * (Superuser only.) |
| */ |
| #define RNDADDENTROPY _IOW( 'R', 0x03, int [2] ) |
| |
| /* Clear entropy count to 0. (Superuser only.) */ |
| #define RNDZAPENTCNT _IO( 'R', 0x04 ) |
| |
| /* Clear the entropy pool and associated counters. (Superuser only.) */ |
| #define RNDCLEARPOOL _IO( 'R', 0x06 ) |
| |
| struct rand_pool_info { |
| int entropy_count; |
| int buf_size; |
| __u32 buf[0]; |
| }; |
| |
| struct rnd_state { |
| __u32 s1, s2, s3; |
| }; |
| |
| /* Exported functions */ |
| |
| /* |
| * Flags for getrandom(2) |
| * |
| * GRND_NONBLOCK Don't block and return EAGAIN instead |
| * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom |
| */ |
| #define GRND_NONBLOCK 0x0001 |
| #define GRND_RANDOM 0x0002 |
| |
| #ifdef __KERNEL__ |
| |
| extern void add_device_randomness(const void *, unsigned int); |
| extern void add_input_randomness(unsigned int type, unsigned int code, |
| unsigned int value); |
| extern void add_interrupt_randomness(int irq, int irq_flags); |
| |
| extern void get_random_bytes(void *buf, int nbytes); |
| extern void get_random_bytes_arch(void *buf, int nbytes); |
| void generate_random_uuid(unsigned char uuid_out[16]); |
| extern int random_int_secret_init(void); |
| |
| #ifndef MODULE |
| extern const struct file_operations random_fops, urandom_fops; |
| #endif |
| |
| unsigned int get_random_int(void); |
| unsigned long get_random_long(void); |
| unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len); |
| |
| u32 prandom_u32(void); |
| void prandom_bytes(void *buf, int nbytes); |
| void prandom_seed(u32 seed); |
| void prandom_reseed_late(void); |
| |
| /* |
| * These macros are preserved for backward compatibility and should be |
| * removed as soon as a transition is finished. |
| */ |
| #define random32() prandom_u32() |
| #define srandom32(seed) prandom_seed(seed) |
| |
| u32 prandom_u32_state(struct rnd_state *); |
| void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes); |
| |
| /* |
| * Handle minimum values for seeds |
| */ |
| static inline u32 __seed(u32 x, u32 m) |
| { |
| return (x < m) ? x + m : x; |
| } |
| |
| /** |
| * prandom_seed_state - set seed for prandom_u32_state(). |
| * @state: pointer to state structure to receive the seed. |
| * @seed: arbitrary 64-bit value to use as a seed. |
| */ |
| static inline void prandom_seed_state(struct rnd_state *state, u64 seed) |
| { |
| u32 i = (seed >> 32) ^ (seed << 10) ^ seed; |
| |
| state->s1 = __seed(i, 2); |
| state->s2 = __seed(i, 8); |
| state->s3 = __seed(i, 16); |
| } |
| |
| #ifdef CONFIG_ARCH_RANDOM |
| # include <asm/archrandom.h> |
| #else |
| static inline int arch_get_random_long(unsigned long *v) |
| { |
| return 0; |
| } |
| static inline int arch_get_random_int(unsigned int *v) |
| { |
| return 0; |
| } |
| #endif |
| |
| #endif /* __KERNEL___ */ |
| |
| #endif /* _LINUX_RANDOM_H */ |