root/include/linux/random.h

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INCLUDED FROM


   1 /*
   2  * include/linux/random.h
   3  *
   4  * Include file for the random number generator.
   5  */
   6 
   7 /*
   8  * We should always include the random number generator, since it's
   9  * relatively small, and it's most useful when application developers
  10  * can assume that all Linux systems have it.  (Ideally, it would be
  11  * best if we could assume that all Unix systems had it, but oh
  12  * well....)
  13  * 
  14  * Also, many kernel routines will have a use for good random numbers,
  15  * for example, for truely random TCP sequence numbers, which prevent
  16  * certain forms of TCP spoofing attacks.
  17  */
  18 #define CONFIG_RANDOM
  19 
  20 /* Exported functions */
  21 
  22 #ifdef CONFIG_RANDOM
  23 void rand_initialize(void);
  24 
  25 void add_keyboard_randomness(unsigned char scancode);
  26 void add_interrupt_randomness(int irq);
  27 
  28 void get_random_bytes(void *buf, int nbytes);
  29 int read_random(struct inode * inode, struct file * file,
  30                 char * buf, int nbytes);
  31 int read_random_unlimited(struct inode * inode, struct file * file,
  32                           char * buf, int nbytes);
  33 #else
  34 #define add_keyboard_randomness(x)
  35 #define add_interrupt_randomness(x)
  36 #endif

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