Does Hyperledger Sawtooth have any component that performs an action similar to what Fabric CA does in Hyperledger Fabric?
In case it does not have, can I make use of any such external component?
No, Hyperledger Sawtooth does not have a CA. One can use any identity software one wishes to use.
Examples of open source identity software include * Hyperledger Indy (blockchain-based Identity software) * Apache Synscope (based on the Sun Identity Manager) * OpenIDM * Gluu