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+" openssl.vim version 3.2 2008 Noah Spurrier <noah@noah.org>
+"
+" == Edit OpenSSL encrypted files and turn Vim into a Password Safe! ==
+"
+" This plugin enables reading and writing of files encrypted using OpenSSL.
+" The file must have the extension of one of the ciphers used by OpenSSL. For
+" example:
+"
+"    .des3 .aes .bf .bfa .idea .cast .rc2 .rc4 .rc5 (.bfa is base64 ASCII
+"    encoded blowfish.)
+"
+" This will turn off the swap file and the .viminfo log. The `openssl` command
+" line tool must be in the path.
+"
+" == Install ==
+"
+" Put this in your plugin directory and Vim will automatically load it:
+"
+"    ~/.vim/plugin/openssl.vim
+"
+" You can start by editing an empty unencrypted file. Give it one of the
+" extensions above. When you write the file you will be asked to give it a new
+" password.
+"
+" == Simple Vim Password Safe ==
+"
+" If you edit any file named '.auth.bfa' (that's the full name, not just the
+" extension) then this plugin will add folding features and an automatic quit
+" timeout.
+"
+" Vim will quit automatically after 5 minutes of no typing activity (unless
+" the file has been changed).
+"
+" This plugin will fold on wiki-style headlines in the following format:
+"
+"     == This is a headline ==
+" 
+" Any notes under the headline will be inside the fold until the next headline
+" is reached. The SPACE key will toggle a fold open and closed. The q key will
+" quit Vim. Create the following example file named ~/.auth.bfa:
+"
+"     == Colo server ==
+"
+"     username: maryjane password: esydpm
+"
+"     == Office server ==
+"
+"     username: peter password: 4m4z1ng
+"
+" Then create this bash alias:
+"
+"     alias auth='view ~/.auth.bfa'
+"
+" Now you can view your password safe by typing 'auth'. When Vim starts all
+" the password information will be hidden under the headlines. To view the
+" password information put the cursor on the headline and press SPACE. When
+" you write an encrypted file a backup will automatically be made.
+"
+" This plugin can also make a backup of an encrypted file before writing
+" changes. This helps guard against the situation where you may edit a file
+" and write changes with the wrong password. You can still go back to the
+" previous backup version. The backup file will have the same name as the
+" original file with .bak before the original extension. For example:
+"
+"     .auth.bfa  -->  .auth.bak.bfa
+"
+" To turn on backups put the following global definition in your .vimrc file:
+" 
+"     let g:openssl_backup = 1
+"
+" Thanks to Tom Purl for the original des3 tip.
+"
+" I release all copyright claims. This code is in the public domain.
+" Permission is granted to use, copy modify, distribute, and sell this
+" software for any purpose. I make no guarantee about the suitability of this
+" software for any purpose and I am not liable for any damages resulting from
+" its use. Further, I am under no obligation to maintain or extend this
+" software. It is provided on an 'as is' basis without any expressed or
+" implied warranty.
+"
+" $Id: openssl.vim 189 2008-01-28 20:44:44Z root $
+
+augroup openssl_encrypted
+if exists("openssl_encrypted_loaded")
+    finish
+endif
+let openssl_encrypted_loaded = 1
+autocmd!
+
+function! s:OpenSSLReadPre()
+    set cmdheight=3
+    set viminfo=
+    set noswapfile
+    set shell=/bin/sh
+    set bin
+endfunction
+
+function! s:OpenSSLReadPost()
+    let l:cipher = expand("%:e")
+    if l:cipher == "aes"
+        let l:cipher = "aes-256-cbc"
+    endif
+    if l:cipher == "bfa"
+        let l:cipher = "bf"
+        let l:expr = "0,$!openssl " . l:cipher . " -d -a -salt"
+    else
+        let l:expr = "0,$!openssl " . l:cipher . " -d -salt"
+    endif
+
+    silent! execute l:expr
+    if v:shell_error
+        silent! 0,$y
+        silent! undo
+        echo "COULD NOT DECRYPT USING EXPRESSION: " . expr
+        echo "Note that your version of openssl may not have the given cipher engine built-in"
+        echo "even though the engine may be documented in the openssl man pages."
+        echo "ERROR FROM OPENSSL:"
+        echo @"
+        echo "COULD NOT DECRYPT"
+        return
+    endif
+    set nobin
+    set cmdheight&
+    set shell&
+    execute ":doautocmd BufReadPost ".expand("%:r")
+    redraw!
+endfunction
+
+function! s:OpenSSLWritePre()
+    set cmdheight=3
+    set shell=/bin/sh
+    set bin
+
+    if !exists("g:openssl_backup")
+        let g:openssl_backup=0
+    endif
+    if (g:openssl_backup)
+        silent! execute '!cp % %:r.bak.%:e'
+    endif
+
+    let l:cipher = expand("<afile>:e") 
+    if l:cipher == "aes"
+        let l:cipher = "aes-256-cbc"
+    endif
+    if l:cipher == "bfa"
+        let l:cipher = "bf"
+        let l:expr = "0,$!openssl " . l:cipher . " -e -a -salt"
+    else
+        let l:expr = "0,$!openssl " . l:cipher . " -e -salt"
+    endif
+
+    silent! execute l:expr
+    if v:shell_error
+        silent! 0,$y
+        silent! undo
+        echo "COULD NOT ENCRYPT USING EXPRESSION: " . expr
+        echo "Note that your version of openssl may not have the given cipher engine built in"
+        echo "even though the engine may be documented in the openssl man pages."
+        echo "ERROR FROM OPENSSL:"
+        echo @"
+        echo "COULD NOT ENCRYPT"
+        return
+    endif
+endfunction
+
+function! s:OpenSSLWritePost()
+    silent! undo
+    set nobin
+    set shell&
+    set cmdheight&
+    redraw!
+endfunction
+
+autocmd BufReadPre,FileReadPre     *.des3,*.des,*.bf,*.bfa,*.aes,*.idea,*.cast,*.rc2,*.rc4,*.rc5,*.desx call s:OpenSSLReadPre()
+autocmd BufReadPost,FileReadPost   *.des3,*.des,*.bf,*.bfa,*.aes,*.idea,*.cast,*.rc2,*.rc4,*.rc5,*.desx call s:OpenSSLReadPost()
+autocmd BufWritePre,FileWritePre   *.des3,*.des,*.bf,*.bfa,*.aes,*.idea,*.cast,*.rc2,*.rc4,*.rc5,*.desx call s:OpenSSLWritePre()
+autocmd BufWritePost,FileWritePost *.des3,*.des,*.bf,*.bfa,*.aes,*.idea,*.cast,*.rc2,*.rc4,*.rc5,*.desx call s:OpenSSLWritePost()
+
+" The following implements a simple password safe for any file named
+" '.auth.bfa'. The file is encrypted with Blowfish and base64 encoded.
+" Folding is supported for == headlines == style lines.
+
+function! HeadlineDelimiterExpression(lnum)
+    if a:lnum == 1
+        return ">1"
+    endif
+    return (getline(a:lnum)=~"^\\s*==.*==\\s*$") ? ">1" : "="
+endfunction
+autocmd BufReadPost,FileReadPost   .auth.bfa set foldexpr=HeadlineDelimiterExpression(v:lnum)
+autocmd BufReadPost,FileReadPost   .auth.bfa set foldlevel=0
+autocmd BufReadPost,FileReadPost   .auth.bfa set foldcolumn=0
+autocmd BufReadPost,FileReadPost   .auth.bfa set foldmethod=expr
+autocmd BufReadPost,FileReadPost   .auth.bfa set foldtext=getline(v:foldstart)
+autocmd BufReadPost,FileReadPost   .auth.bfa nnoremap <silent><space> :exe 'silent! normal! za'.(foldlevel('.')?'':'l')<CR>
+autocmd BufReadPost,FileReadPost   .auth.bfa nnoremap <silent>q :q<CR>
+autocmd BufReadPost,FileReadPost   .auth.bfa highlight Folded ctermbg=red ctermfg=black
+autocmd BufReadPost,FileReadPost   .auth.bfa set updatetime=300000
+autocmd CursorHold                 .auth.bfa quit
+
+augroup END
+