Vim blowfish encryption | Hacker News Reader

Vim blowfish encryption

dgl.cx

36 pointsdgl17 comments

I use gpg to work around vim's encryption inconsistencies across different versions. This vimrc does the trick for me: https://gist.github.com/iatrou/9da751368aecdf0a37f1

while reading this the only thing on my mind is how un-vim that feature is.

i would expect an hex editor mode would make much more sense to be added before they went to such shenanigans feature such as frivolous encryption. which can be trivial to use the Unix way... the way hex editing must be done for great pains btw.

I don't see how you can justify hex editing without justifying encryption. In both cases, you can either do a conversion with a separate tool outside of the editor, edit the converted text, and then covert it back, or have the conversion logic integrated into the editor.

I would argue that, encryption, if implemented properly, is best integrated into the editor because the editor can be sure to store the clear text in mlock'd memory and avoid leaking clear text in other ways (such as into ~/.viminfo). If you have to decrypt with a separate tool, the clear text hits the disk and the editor doesn't know to be careful with it. These are concerns that aren't present with hex editing.

I have no idea if vim is this careful though and sadly I wouldn't count it.

The editor doesn't have to do crypto itself to know it's dealing with sensitive content. A somewhat overblown concern in the age of encrypted swap, anyway.

Cleartext doesn't have to be saved to disk for a separate tool to be used. You can pretty much use GPG from vim as-is just by piping the buffer through it: ":%!gpg -e -a -r yourself" and ":%!gpg -d". The vim GPG plugins can take care of the remaining annoyances.

It's not just swap (I don't think encrypted swap is that common anyways) but also the viminfo and swp files.

The UX for vim's encryption is really good - it's convenient and easy to use. Any replacement would need to be equally easy and well-integrated. If you require users to do manual steps, like type commands or remember to tell vim that it's editing sensitive content, then mistakes will be made that harm security. If the plugin interface can provide a sufficient level of integration, that's great and would be a good alternative to building crypto into vim itself.

Every OS has supported encrypted swap for some time now. It's the default on Macs since Mountain Lion and either the default or a checkbox away on popular Linux distributions. It's a single terminal command in Windows, and encryption of everything is default in Windows 8.1 with a TPM 2.0 module.

They all support general disk/filesystem encryption, too. If you're technically minded enough to be using vim and trying to encrypt files with it, and you're not using an encrypted filesystem to start with, you're pretty nuts.

The core UX for gnupg.vim is open .gpg/.pgp/.asc file, be automatically prompted for passphrase (unless file is new), edit file, save (be prompted for recipients if new). Done.

You're obviously going to have to complain to the vim maintainers about sensitive content. There's been a patch floating around for over a decade to get vim to support mlock. Its blowfish encryption is certainly no safer than gnupg.vim in that regard. gnupg.vim does turn off the viminfo/swapfile/undofile functionality.

> The core UX for gnupg.vim is open .gpg/.pgp/.asc file, be automatically prompted for passphrase (unless file is new), edit file, save (be prompted for recipients if new). Done.

> gnupg.vim does turn off the viminfo/swapfile/undofile functionality.

Thanks. That is excellent UX and knowing that I can agree it's what people should use instead of the built-in encryption.

Exactly why I love that it is baked into Vim.

Just make sure you're using the latest version and set cryptmethod=blowfish2!

Edit: Actually just use gnupg.vim - as nknighthb has explained the UX is just as good as vim's builtin encryption, and then you don't have to worry that this whole thread about vim's builtin encryption was predicated with "...if implemented properly...", which you certainly can't take for granted.

And then reflect on the fact that you're still using a joke of a "KDF". SHA256 1001 times? Really? (And it doesn't even so much as have provision for upping the number of iterations!)

Like TFA says, don't roll your own crypto. GnuPG exists for a reason.

Not to mention that a large set of keys are known to be reflectively weak under Blowfish:

http://iacr.org/archive/fse2007/45930168/45930168.pdf

And of course there's ciphertext malleability attacks as it's not using authenticated encryption

vim ships with xxd since decades

I am beginning to think Vim has too many features. And it must be hell managing that codebase.

That is why neovim maintainers decided to remove encryption from the codebase.

check https://github.com/neovim/neovim/issues/694 and https://github.com/neovim/neovim/pull/699

No, this is one thing I love Vim for and use it. It is fixed going forward. It is the only x-platform one that isn't messy at some point.

Have you actually looked at the Vim codebase?

Can anybody with knowledge of vim see if the GPG plugin at vim.wikia.com is secure with regards to mlock?

It is what I currently use. Very convenient. I never trusted something editor-specific.

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