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Users can perform a HEAD or GET request on a binary resource and include, as part of the request, a "Want-Digest" header, indicating that the server should recalculate the message digest per the provided algorithm and return the calculated digest as part of the response headers. In this way, the client can compare the calculated value with the stored value to determine the integrity of the on-disk stored content. A mismatch suggests some form of binary corruption and the repository manager should investigate and take appropriate actions to remediate.
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By default, Fedora will calculate and store a SHA-512 digest for all binaries if none were provided via "Digest" header. This digest will be available via the fcr:metadata endpoint for the binary, stored under a <http://www.loc.gov/premis/rdf/v1#hasMessageDigest> property.
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