Source code and details: https://git.anarchists.space/nemesis/PGPDroid
Features
- Supports creating RSA or modern elliptic-curve key pairs directly on device
- Enter a message and tool encrypts it for stored recipient
- Import, export, and inspect public and private keys
- No internet permission required
- Compatible with a wide range of PGP implementations
- Clean Material Design interface
Does this work with yubikey?
Not yet, but I will eventually add YubiKey support :)