ID is a unique CHURP identifier within the key manager runtime.
MayJoin is the vector of enclave identities that may form the new committee in the next handoffs.
MayShare is the vector of enclave identities from which a share can be obtained during handouts.
RuntimeID is the identifier of the key manager runtime.
Serial is the monotonically increasing policy serial number.
PolicySGX represents an SGX access control policy used to authenticate key manager enclaves during handoffs.