@decart said:
OR just use some google-fu and find exactly the same script with the decrypt function already written…
So then it’s easier for all of you.
I did not google - just did some dd and y in vim and came to a brute-force script in about 5 minutes. Then I realized that I do not need to brute-force as the password is given in text 
- so I just included this single password in my password.lst in the script 