I have searched the mailing list archives as well as the
internet at large but haven't been able to find a _streaming_
version of md5 hashing for large objects. The closest thing I
found is this thread
http://www.postgresql.org/message-id/5d0f60990704081003p615530acx86257a70bff33fa4@mail.gmail.com
which eventually lead to this code
http://llg.cubic.org/pg-mdagg/
which, however, doesn't stream in the large object data
either. Essentially, for hashing _very_ large objects (to the
order of several GB per object, I am dealing with radiology
studies aka DICOM data) one would want an md5 function which
streams in parts of a large object piece by piece using
md5_update and m5_finalize or some such.
It didn't look like pgcrypto offers a streaming version either.
Anything I am overlooking ?
Thanks,
Karsten
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