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ipsec_ranbits (8)
  • >> ipsec_ranbits (8) ( Разные man: Команды системного администрирования )
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    NAME

    ipsec ranbits - generate random bits in ASCII form
     
    

    SYNOPSIS

    ipsec ranbits [ --quick ] [ --continuous ] [ --bytes ] nbits  

    DESCRIPTION

    Ranbits obtains nbits (rounded up to the nearest byte) high-quality random bits from random(4), and emits them on standard output as an ASCII string. The default output format is datatot(3) h format: lowercase hexadecimal with a 0x prefix and an underscore every 32 bits.

    The --quick option produces quick-and-dirty random bits: instead of using the high-quality random bits from /dev/random, which may take some time to supply the necessary bits if nbits is large, ranbits uses /dev/urandom, which yields prompt results but lower-quality randomness.

    The --continuous option uses datatot(3) x output format, like h but without the underscores.

    The --bytes option causes nbits to be interpreted as a byte count rather than a bit count.  

    FILES

    /dev/random, /dev/urandom  

    SEE ALSO

    ipsec_datatot(3), random(4)  

    HISTORY

    Written for the Linux FreeS/WAN project <http://www.freeswan.org> by Henry Spencer.  

    BUGS

    There is an internal limit on nbits, currently 20000.

    Without --quick, ranbits's run time is difficult to predict. A request for a large number of bits, at a time when the system's entropy pool is low on randomness, may take quite a while to satisfy.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    SEE ALSO
    HISTORY
    BUGS


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