hilbix / md5chk

Create md5sum from files for easy shell usage

See file DESCRIPTION for now.

Usage

git clone --recursive https://github.com/hilbix/md5chk.git
cd md5chk
make
sudo make install

FAQ

WTF why?

• Because I need it

MD5 is insecure!

• MD5 is broken as security algorithm. But it still is a good file hash and better than a CRC.
• Compare: SHA1 is broken, too. But git still uses it.
• The security of an algorithm has to do with how it is used, not with the algorithm itself.
• Just be aware that there can be MD5 collisions. To thwart a bit you can use a random -p.
• Even that md5 is not cryptographical safe it still can detect file corruption due to failing hardware.
• I believe that there are no byte sequences A and B where md5(XA)===md5(XB) for any given X.
  • But I am not sure. But I am pretty sure that md5(X P(A)) !== md5(X P(B)) with a certain part P(_).
  • So using -b or -p with a random -e and -f should even detect carefully created colliding files.

License?

• This Works is placed under the terms of the Copyright Less License,
  see file COPYRIGHT.CLL. USE AT OWN RISK, ABSOLUTELY NO WARRANTY.
• But be aware that some, but not all, files in Submodule tino/ are not CLLed yet, so they are still under GNU GPL v2.
  This probably will slowly change from GPLv2 to CLL, but this transition is not done yet. Sorry.