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Re: Gnus: Store message in PGP-decrypted form

From: Jamie Beardslee
Subject: Re: Gnus: Store message in PGP-decrypted form
Date: Wed, 10 Jun 2020 13:38:14 +1200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

It's not exactly what you want, but `epa-decrypt-region' usually works
for my needs.  In any case, here's a little function to decrypt some
saved mail.

(defun decrypt-saved-message (file &optional save)
  "Decrypt a plaintext mail FILE.
With prefix arg SAVE, save the decrypted contents."
  (interactive "F\nP")
  (require 'epa-mail)
  (let ((buffer (get-buffer-create
                 (format "%s *decrypted*"
                         (file-name-nondirectory file)))))
    (pop-to-buffer buffer)
    (insert-file-contents file)
    (while (re-search-forward "-----BEGIN PGP MESSAGE-----$" nil t)
      (setq armor-start (match-beginning 0)
            armor-end (re-search-forward "^-----END PGP MESSAGE-----$"
                                         nil t))
      (unless armor-end
        (error "Encryption armor beginning has no matching end"))
      (goto-char armor-start)
      (let* ((context (epg-make-context 'OpenPGP))
             (decrypted (epg-decrypt-string
                         (buffer-substring armor-start armor-end))))
        (delete-region armor-start armor-end)
        (insert decrypted)))
    (when (or save (y-or-n-p "Save mail in decrypted form?"))
      (write-file file))))

It can be used interactively, or if you want to decrypt a bunch of saved
mails you can call it from lisp with a second argument:

(dolist (f '("~/mail1" "~/mail2" ...))
  (decrypt-saved-message f t))

Surely this can be hacked a bit to make gnus decrypt the mail before


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