CheckSignature is exported for use in tests and akamai-test-srv.

GeneratePurgeURLs generates akamai URLs that can be POSTed to in order to purge akamai's cache of the corresponding OCSP responses.

NewCachePurgeClient performs some basic validation of supplied configuration and returns a newly constructed CachePurgeClient.

ErrAllRetriesFailed indicates that all purge submission attempts have failed.

CachePurgeClient talks to the Akamai CCU REST API.