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Интерактивная система просмотра системных руководств (man-ов)

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arc4random (3)
  • >> arc4random (3) ( FreeBSD man: Библиотечные вызовы )
  • arc4random (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    arc4random
    
     
    arc4random_stir
    
     
    arc4random_addrandom
    
     - arc4 random number generator
    
     
    

    LIBRARY

    Lb libc
    
     
    

    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 ();
    function returns pseudo-random numbers in the range of 0 to (2**32)-1, and therefore has twice the range of rand(3) and random(3).

    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.  

    EXAMPLES

    The following produces a drop-in replacement for the traditional rand ();
    and random ();
    functions using arc4random (:);

    "#define foo4random() (arc4random() % ((unsigned)RAND_MAX + 1))"
     

    SEE ALSO

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

    HISTORY

    RC4 has been designed by RSA Data Security, Inc. It was posted anonymously 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


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    EXAMPLES
    SEE ALSO
    HISTORY


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