AllPartsFiles returns a glob string that matches all TRC parts for the given ISD and version.

Dir returns the directory where TRCs are written to.

PartsDir returns the directory where the partially signed TRC is written to.

PartsFile returns the file path for the partially signed TRC for a given AS.

ProtoFile returns the file path for the prototype TRC.

SignedFile returns the file path for the signed TRC.