generate magic cookies for xauth
see also :
X - xauth - md5sum
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generates a 128-bit random hexadecimal number for use with
the X authority system. Typical usage:
xauth add :0 .
"random" number generated is actually the output
of the MD5 message digest fed with various pieces of random
information: the current time, the process id, the parent
process id, and optionally the contents of an input file.
and several bytes of information from the first of the
following devices which is present: /dev/random,
/dev/urandom, files in /proc,
Use file as a macig cookie
seed. When file is defined as ’-’ character
input is read from stdin.
Explain what is being done.
Output version information and
Display this help and exit.
The mcookie command is part of the util-linux package and is
available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
The entropy in
the generated 128-bit is probably quite small (and,
therefore, vulnerable to attack) unless a non-pseudorandom
number generator is used (e.g., /dev/random under
It is assumed
that none of the devices opened will block.
xauth , md5sum