Provided by: signtos_10.0.0+r36-1.1_all 

NAME
signtos - signing tool for signing Trusty images
SYNOPSIS
Command line tool from Android for signing Trusty image files:
signtos [-providerClass className] privatekey.pk8 input.img output.img
DESCRIPTION
Signs ARM Trusty images for use with operating systems that support it. Trusty is a set of software com‐
ponents supporting a Trusted Execution Environment (TEE) on mobile devices. The key must be stored in
PKCS#8 format.
SEE ALSO
SIGNAPK(1)
https://source.android.com/security/trusty/
AUTHORS
The Android Open Source Project.
SIGNTOS(1)