include/linux/random.h

   1 /*
   2  * include/linux/random.h
   3  *
   4  * Include file for the random number generator.
   5  */
   6
   7 #ifndef _LINUX_RANDOM_H
   8 #define _LINUX_RANDOM_H
   9
  10 #include <linux/types.h>
  11 #include <linux/ioctl.h>
  12 #include <linux/irqnr.h>
  13
  14 /* ioctl()'s for the random number generator */
  15
  16 /* Get the entropy count. */
  17 #define RNDGETENTCNT    _IOR( 'R', 0x00, int )
  18
  19 /* Add to (or subtract from) the entropy count.  (Superuser only.) */
  20 #define RNDADDTOENTCNT  _IOW( 'R', 0x01, int )
  21
  22 /* Get the contents of the entropy pool.  (Superuser only.) */
  23 #define RNDGETPOOL      _IOR( 'R', 0x02, int [2] )
  24
  25 /*
  26  * Write bytes into the entropy pool and add to the entropy count.
  27  * (Superuser only.)
  28  */
  29 #define RNDADDENTROPY   _IOW( 'R', 0x03, int [2] )
  30
  31 /* Clear entropy count to 0.  (Superuser only.) */
  32 #define RNDZAPENTCNT    _IO( 'R', 0x04 )
  33
  34 /* Clear the entropy pool and associated counters.  (Superuser only.) */
  35 #define RNDCLEARPOOL    _IO( 'R', 0x06 )
  36
  37 struct rand_pool_info {
  38         int     entropy_count;
  39         int     buf_size;
  40         __u32   buf[0];
  41 };
  42
  43 /* Exported functions */
  44
  45 #ifdef __KERNEL__
  46
  47 extern void add_device_randomness(const void *, unsigned int);
  48 extern void add_input_randomness(unsigned int type, unsigned int code,
  49                                  unsigned int value);
  50 extern void add_interrupt_randomness(int irq, int irq_flags);
  51
  52 extern void get_random_bytes(void *buf, int nbytes);
  53 extern void get_random_bytes_arch(void *buf, int nbytes);
  54 void generate_random_uuid(unsigned char uuid_out[16]);
  55
  56 #ifndef MODULE
  57 extern const struct file_operations random_fops, urandom_fops;
  58 #endif
  59
  60 unsigned int get_random_int(void);
  61 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
  62
  63 u32 random32(void);
  64 void srandom32(u32 seed);
  65
  66 #ifdef CONFIG_ARCH_RANDOM
  67 # include <asm/archrandom.h>
  68 #else
  69 static inline int arch_get_random_long(unsigned long *v)
  70 {
  71         return 0;
  72 }
  73 static inline int arch_get_random_int(unsigned int *v)
  74 {
  75         return 0;
  76 }
  77 #endif
  78
  79 #endif /* __KERNEL___ */
  80
  81 #endif /* _LINUX_RANDOM_H */