Replace Spongycastle with bouncycastle or use android built in version

[TuxCoder]

Spongycastel is a fork from bouncycastle.
This fork was created because of:

The Android platform unfortunately ships with a cut-down version of Bouncy Castle - as well as being crippled, it also makes installing an updated version of the libraries difficult due to classloader conflicts.

Src: https://rtyley.github.io/spongycastle/

The thing is this, Android resolved this confliction after Android 3.
As this libary is not needed anymore and it needs time to maintain.
The developer canceled the support!

Ref: rtyley/spongycastle#34
Ref2: open-keychain/open-keychain#1676

As result the latest updated was 2017-08-30.

Please replace this package with a upstream bouncycastle or use the android build in com.android.org.bouncycastle if possible.

[mitsuhiko]

I think this one might be worth looking into @uluckas.

[uliluckas]

Fixed in bc35c43