Building the Trusty Little Kernel with the Keymaster application

[Peter]

I am trying to build the Trusty Little Kernel with the Keymaster application so that I can look at how trusted applications work.  Unfortunately I cannot find any information on the web so I hope someone here can help me (or at least direct me to a more appropriate forum).

I found a Repo manifest for Trusty at https://android.googlesource.com/trusty/manifest/+/master and when I pull it I can build a basic Trusty, but this does not include the Keymaster application.  I used Git to download the Keymaster source code from https://android.googlesource.com/trusty/app/keymaster/+/master, but when I use:

> make TRUSTY_ALL_USER_TASKS=keymaster generic-arm64

make objects to missing openssl dependencies.  Clearly I am not using the right approach to downloading the source, but the only Repo manifest file that I can find that includes the kemaster code is the one for the Google mirror.