An extension to zx2c4's "pass" to generate passwords using the diceware method
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README.md

pass-diceware

A pass extension to generate passwords using the diceware method

Usage

Generate and insert a passhprase of 6 words:

$ pass diceware Email/example.com 6

To install system-wide, run

$ sudo make install

To install for user only, run

$ cp diceware.bash $HOME/.password-store/.extensions
$ cp diceware.wordlist.asc $HOME/.password-store/.extensions

By default, pass does not run extensions installed by the user; you'll need to add the following line to your .bashrc in order to tell it to enable them:

PASSWORD_STORE_ENABLE_EXTENSIONS=true

Use your own diceware file

Just run:

$ pass diceware --diceware-file diceware.wordlist.asc Email/example.com 6

The default behaviour is to try to use one of the following two files, in this order: $HOME/.password-store/.extensions/diceware.wordlist.asc and /usr/lib/password-store/extensions/diceware.wordlist.asc.

So, if you want to override the default file, regardless of whether you have a system-wide install or a user install, just save your own diceware file as $HOME/.password-store/.extensions/diceware.wordlist.asc (you must rename it to diceware.wordlist.asc)

Security

The only absoutely secure method to generate a diceware passphrase is to throw a casino die on a hard surface in an empty roon with the curtains closed and never write it down.

This program generates passwords (essentially) by running cat diceware.wordlist.asc | shuf LENGTH. The shuf program uses entropy from /dev/urandom, which should be secure enough for most purposes. It's what pass generate uses anyway.

If the provided diceware wordlist begins with -----BEGIN PGP SIGNED MESSAGE-----, i.e. is clearsigned with gpg, it will be verified with gpg --verify and the result will be printed on screen.

If no signature is found, the program will print a warning. It is recommended to use a signed file to ensure the word list has not been tampered with. The file provided in this repo (and used by default) has been signed by me, as I found the original signature to be invalid.