The iOS certificate provider sample project implements a certificate provider interface by retrieving the client certificate from a p12 file in the application bundle. The provider displays a native UI screen to let the user enter the p12 file name and password.

The Android certificate provider sample project implements a certificate provider interface by retrieving the certificate from a p12 file on the filesystem. The provider displays a native UI screen to let user enter the p12 file name and password, and the certificate alias to use.