Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     u_int32_t
     arc4random(void);

     void
     arc4random_stir(void);

     void
     arc4random_addrandom(unsigned char *dat, int datlen);

DESCRIPTION

     The arc4random() function uses the key stream generator employed by the
     arc4 cipher, which uses 8*8 8 bit S-Boxes.  The S-Boxes can be in about
     (2**1700) states.

     The arc4random_stir() function reads data from /dev/urandom and uses it
     to permute the S-Boxes via arc4random_addrandom().

     There is no need to call arc4random_stir() before using arc4random(),
     since arc4random() automatically initializes itself.

SEE ALSO

     rand(3), random(3), srandomdev(3)

HISTORY

     RC4 has been designed by RSA Data Security, Inc.  It was posted anony-
     mously to the USENET and was confirmed to be equivalent by several
     sources who had access to the original cipher.  Since RC4 used to be a
     trade secret, the cipher is now referred to as ARC4.

BSD                             April 15, 1997                             BSD