A way to change rar/zip hash in bulk?

[XCOLVE]

Hi,

I'm looking for a way to change the hash of rar/zip archives in bulk, they are also password protected (same password for all files). I've seen that other users add txt files to pad the file and therefor change the hash, is there a working script out there that anyone know about or are people manually adding files to their archives by hand?

 

[Alex|Byte Whale]

You can do it with installing unrar to linux

# yum install unrar

or

RHEL/CentOS/Fedora with wget.

After it's installed you can use the rar u commmand'

For example if you want to add a file to 123456.rar

rar u 123456.rar text.txt


*You can write a bash which can auto do the above for you.

I suggest you do the smallest .txt file possible if you do this as your goal is just to change the size a bit.


Just FYI there are another way to do it but it's not verified or bulletproof, you simply have to echo a 0 onto a file

echo 0 >> 123456.rar

But this may damage your file and you won't be able to use it.

 

[sohom]

no need to add a text file to change the md5 hash code
appending a null value is enough to change that

 

[Alex|Byte Whale]

no need to add a text file to change the md5 hash code
appending a null value is enough to change that

Adding a null value may damage the file.

Have you tried this on many files?

 

[sohom]

no need to add a text file to change the md5 hash code
appending a null value is enough to change that

Adding a null value may damage the file.

Have you tried this on many files?

had tried on media(avi/mkv/png) and .rar(pass protected) files
no problem at all

 

[Alex|Byte Whale]

I suggest you try all methods and make a decision by yourself, as far as I know adding a null value is risky and may damage your file which in the long run will result in angry users who ask you unnecessary questions leading to a waste of time.