Checking data integrity with search command

A short question:

I have configured IT data block signing, as described here:http://docs.splunk.com/Documentation/Splunk/6.0/Security/ITDataSigning

Checking the integrity via "Show Source" in SplunkWeb works fine, but is there a way to verify the integrity with a search command (so I can perform the check via API, etc.).

Example: I want an output as the following SPL-Statement gives me, if audit event signing is enabled.

index=_audit | audit | table validity gap _raw