Package: torand
torandGenerating real random bytes requires to get different results from the execution of a same operation. It is a problem for the computer, whose operations are normally deterministic (like 1 + 1 always results 2), to generate real random bytes.We observe that the time costs can be different for the computer to run the same code. For example, we run the below code for twice:from time import time
print([-(time() - time()) for _ in range(8)])and it reports:[-0.0, 1.1920928955078125e-06, -0.0, -0.0, 9.5367431640625e-07, -0.0, -0.0, -0.0]and[-0.0, -0.0, -0.0, -0.0, -0.0, -0.0, 9.5367431640625e-07, -0.0]respectively, showing the differences.Based on this observation, we may record the time costs during the execution of codes, and generate real random bytes based on the records.We implement this idea, (T)ime differences between (O)perations for real (Rand)om bytes generation, in python as this library.UsageInstall withpip install torand.PythonMain APItorandom(k, fast_mode=True, use_cache=True)Generatekrandom bytes. Wherefast_mode(default toTrue) anduse_cache(default toTrue) indicate the use of the hash-based fast generation and a small random bytes' cache respectively. Settinguse_cachetoTrueis beneficial for the performance when the function will be called to generate a small number (< 32) of random bytes for many times, but insecure as the cache can be manually assigned by the other codes that imports this library.Examplefrom torand import torandom

k = 127
rs = torandom(k, fast_mode=True, use_cache=True)
print(rs)
print(len(rs) == k)Command Line InterfaceExecute eitherpython -m torand (f/s) kortorand (f/s) kto generatekreal random bytes. Wherefandsare optional arguments for the hash-based fast generation mode and the standard generation mode respectively, default isf.PerformanceTest with CPython 3.10.5, using a single Intel Core M3-7Y30 CPU thread. Despite that this library only generates ~87.57 k random bytes per second in the standard mode, which is much slower than theos.urandom(~12.52 MB/s). We still like to share the idea, and the library is also useful in case we only generate some real random bytes with the idea for fast random byte generation algorithms or hash functions (this library can also achieve a generation speed of ~12.52 MB/s in the fast mode).GNU GENERAL PUBLIC LICENSE
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along with this program.  If not, see <https://www.gnu.org/licenses/>.Also add information on how to contact you by electronic and paper mail.If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:<program>  Copyright (C) <year>  <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.The hypothetical commandsshow w' andshow c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, seehttps://www.gnu.org/licenses/.The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please readhttps://www.gnu.org/licenses/why-not-lgpl.html.