mirror of
https://strlcat.eu/rys/tfnoisegen.git
synced 2025-06-15 17:24:27 +02:00
44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
Threefish cipher based raw PRN/noise generator.
|
|
|
|
PURPOSE
|
|
This PRNG is shortened, 32 bit integer version of Threefish-256 block cipher.
|
|
It is technically a 128 bit block cipher with 256 bit key.
|
|
|
|
It's purpose is to generate fillers fast, for use in file or disk shredders.
|
|
It is not meant to be secure, i.e. collision/bias free, but it is good at
|
|
generating random noise equal to average output of /dev/urandom, yet much faster.
|
|
|
|
Typical performance on Athlon 5000+, x86-32 is about 170M/sec.
|
|
|
|
Included tfrand program generates random noise to stdout.
|
|
|
|
USAGE
|
|
Build example:
|
|
|
|
make tfrand
|
|
|
|
Test it:
|
|
|
|
./tfrand >rng.out
|
|
|
|
Measure performance (install tfcrypt first):
|
|
|
|
./tfrand | tfcrypt -V.5 -P - /dev/null
|
|
|
|
Use libtf.a library in your code, see headers for function references:
|
|
tfe.h: STREAM reference.
|
|
tfprng.h: PRNG reference.
|
|
|
|
WARNING
|
|
Do NOT use it as cipher! It's just a random block generator.
|
|
You have been warned.
|
|
|
|
ORIGIN
|
|
This code is derived from tfcipher library.
|
|
|
|
LICENSE
|
|
Public domain -- free to reuse and adapt.
|
|
|
|
AUTHOR
|
|
Andrey Rys <rys@lynxlynx.ru>, 17Mar2019.
|