Sigil, an encryption app for Android, now supports GCM mode for ciphers other than AES.
Sigil can encrypt text (more features are planned). The algorithms and the key derivation function are configurable. Bouncy Castle is used as the framework for encryption. The app does not require internet access.
Thanks to the developer for implementing my feature request!
https://github.com/Animesh-Varma/Sigil/issues/15
https://apt.izzysoft.de/fdroid/index/apk/dev.animeshvarma.sigil
