Android Encryption Supported Over IPSec

I'm exploring the various options that I have for connecting a device running Android 2.2 to a VPN using IPSec, but I have been unable to find a comprehensive list of the encryption methods supported by the OS.

I have seen some description of the 开发者_如何学运维encryption methods supported by Android in general (android-encryption), but I need information specific to IPSec.

Does anyone have this information or know where I might be able to find it?

there's at least "aes-plain" available