Looking for encrypted text editing that uses GNUPG

[HippoMan]

I'm looking for a text editor (or maybe file manager) under Android that allows me to read and write GNUPG-encrypted text. The encryption/decryption must be via GNUPG (or just plain PGP would also be fine). I do not want to utilize any other form of encryption.

In other words, I want this text editor (or file manager) to be able to do all the following things ...

(1) Read a plain-text file on my Android device and allow me to make changes to it and to save the results back on my device in plain-text form.
(2) Read a plain-text file on my Android device and save it on that same device encrypted via GNUPG.
(3) Read a GNUPG encrypted file on my Android device and display it to me in plain-text for editing. When I save my changes, they are stored back on my device in GNUPG-encrypted form.
(4) Read a GNUPG encrypted file on my Android device and display it to me in plain-text for editing. When I save my changes, they are stored back on my device in plain-text form.

I want the choice of saving the file in either encrypted or plaintext form to be specified on a file-by-file basis at run time.

I haven't found anything like this anywhere, despite lots of searching. But hope springs eternal, and I'm wondering if perhaps I missed something.

Thank you in advance.

 

[HippoMan]

I'm not surprised that no suggestions have been offered so far, because as I have mentioned, I've done lots of searching and have come up with nothing, myself.

I'm willing to consider an alternative: does anyone know of an Android text editor or file manager that allows the editing of encrypted files, and whose encryption (not necessarily GNUPG-based) is also manageable (decryption and encryption) by software that runs under Linux? I want to be able to edit encrypted files under Linux and to edit those same files under Android (after I have transferred them to Android). And I want to perform the same function in the opposite direction: i.e., edit encrypted files under Android and edit those same encrypted files after transferring them to Linux.

I want this to be file-by-file encryption, not filesystem encryption such as encfs. And the files must be encrypted and decrypted locally without any access to anything in the cloud.

I know how to incorporate any encryption/decryption mechanism under Linux into emacs, so the Linux-based encryption doesn't need to be part of an existing text editor. However, on the Android side, I need the encryption/decryption to be built into a text editor or file manager.

Thank you for any suggestions.