in optee-utee/src/crypto_op.rs [215:220]
fn set_key<T: ObjHandle>(&self, object: &T) -> Result<()> {
match unsafe { raw::TEE_SetOperationKey(self.handle(), object.handle()) } {
raw::TEE_SUCCESS => return Ok(()),
code => Err(Error::from_raw_error(code)),
}
}