plot-entropy(1) General Commands Manual plot-entropy(1)NAME
plot-entropy - part of the rdd toolkit
SYNOPSIS
plot-entropy <OPTION> infile [lo hi]
DESCRIPTION OPTIONS -o output file.
-t title.
-b block size.
-x exclude file.
BUG REPORTS
Report bugs to <rdd@holmes.nl>.
ACKNOWLEDGEMENTS
Many thanks to all who reported bugs and successes, and who suggested improvements. You know who you are.
COPYRIGHT
Copyright (C) 2002-2003 Netherlands Forensic Institute
This software comes with NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
rdd 2.0 19 November 2006 plot-entropy(1)
Check Out this Related Man Page
RANDOM_HARVEST(9) BSD Kernel Developer's Manual RANDOM_HARVEST(9)NAME
random_harvest -- gather entropy from the kernel for the entropy device
SYNOPSIS
#include <sys/types.h>
#include <sys/random.h>
void
random_harvest(void *entropy, u_int size, u_int bits, u_int frac, enum esource source);
DESCRIPTION
The random_harvest() function is used by device drivers and other kernel processes to pass data that is considered (at least partially) sto-
chastic to the entropy device.
The caller should pass a pointer (to no more than 16 bytes) of the ``random'' data in entropy. The argument size contains the number of
bytes pointed to. The caller should very conservatively estimate the number of random bits in the sample, and pass this in bits or frac. If
the estimated number of bits per sample is an integer, then bits is used, and frac is 0. Otherwise, for low-entropy samples, ``fractional''
entropy can be supplied in frac. (This is considered to be frac / 1024 bits of entropy.) The source is chosen from RANDOM_WRITE,
RANDOM_KEYBOARD, RANDOM_MOUSE, RANDOM_NET and RANDOM_INTERRUPT, and is used to indicate the source of the entropy.
Interrupt harvesting has been simplified for the kernel programmer. If a device driver registers an interrupt handler with BUS_SETUP_INTR(9)
or bus_setup_intr(9), then it is only necessary to include the INTR_ENTROPY bit in the flags argument to have that interrupt source be used
for entropy harvesting.
SEE ALSO random(4), BUS_SETUP_INTR(9)AUTHORS
The FreeBSD random(4) entropy device and supporting documentation was written by Mark R V Murray.
BSD February 6, 2002 BSD
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