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script.py
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README.md

About

  • A simple file authentication system that simulate how you'd be able to authenticate and play video chunks as they are downloaded without having to wait for the entire file.

Description

Simple File Authentication System

Sample Usage

  • The final hash value h0 (hash of the first block with its appended hash) is distributed to users via the authenticated channel.

Help

$ python script.py --help
usage: script.py [-h] [-i BUFFERSIZE] action src dst hash

Simple File Authentication System. Authenticate and decode a received byte
stream or sign and write the bytestream to send.

positional arguments:
  action         SIGN/VERIFY, encode to write a bytestream to send, decode to
                 read and verify a bytestream
  src            Path to read bytes
  dst            The path to write bytes
  hash           This is NOT need for signing.

optional arguments:
  -h, --help     show this help message and exit
  -i BUFFERSIZE  Number of bytes per chunk of data (default: 1024 bytes.)

Sign

$ python script.py SIGN ./data/video1.mp4 ./data/SIGNED.bin -1024
Signing...
Writing hash in memory...
Hashes depleted.
h0:  5b96aece304a1422224f9a41b228416028f9ba26b0d1058f400200f06a589949
File created:  ./data/SIGNED.bin

Verify

$ python script.py VERIFY ./data/SIGNED.bin ./data/VERIFED.mp4 5b96aece304a1422224f9a41b228416028f9ba26b0d1058f400200f06a589949
h0:  5b96aece304a1422224f9a41b228416028f9ba26b0d1058f400200f06a589949
Verifying...
File created:  ./data/VERIFED.mp4