What kind of hashing algorithm does the "View Same" feature use? Output looks like a base64 encoded string but that's not exactly a hashing algorithm, right? I want to check back on some old images I've uploaded that I still have on my HDD without having to post them again and then use "View Same" for the new archived image to find the older ones. I can generate the hash used in the search on my machine.

BTW thanks for the service, I use it a ton.