Feature proposal: add S/MIME signing and encryption to Thunderbird-android

[Vlekjes]

Thunderbird Android supports email encryption and signing using OpenPGP. I would like to add support for S/MIME. Our company Ciphermail (www.ciphermail.com) provides an open source email encryption server product. We also have Ciphermail Android, a free app for encrypting and signing email. Our proposal is to convert this app to a companion app to Thunderbird, as a plugin, in much the same way that Thunderbird Android now supports OpenPGP. We would make our app open source.

[Jon]

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[Vlekjes]

I'd like to add: we have a pull request available for the code that would be needed in Thunderbird Android, and we have an updated version of the Ciphermail Android app that supports this. 

[Vlekjes]

I have created a build of the new CipherMail app with the integration with Thunderbird as outlined in our pull request. The new app does not send or receive email, it does read .eml messages, it has certificate management functions, and the integration with Thunderbird as specified in our pull request. We tested it with the version of Thunderbird from the pull request.

The new app has a different package name than the old app. We will remove the old app from Google Play as soon as the new app is released. 

This is the download link in Google Play open testing:

https://play.google.com/apps/testing/com.ciphermail.android.application

This is the pull request:

https://github.com/thunderbird/thunderbird-android/pull/11033

[Vlekjes]

This is an evaluation build of the Thunderbird app

https://github.com/christine-ciphermail/thunderbird-android/releases/tag/smime-eval-20.0-snapshot