@Override
    public String name() {
        return "decrypt";
    }
Tooling for decrypting a file using a private key that corresponds to the public key used
to originally encrypt the file.

Uses the opaque token abstraction from {@link SharedKeyGenerator}.

@author vekterli
vespaclient-java/src/main/java/com/yahoo/vespa/security/tool/crypto/DecryptTool.java