How are the hashes in tumblr image urls generated?

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Disclaimer: hobbyist here, not a professional programmer. Working on a pet project, nothing that would be useful in the real world.

I'm trying to determine whether the hashes in the url of a tumblr image are in any way related to the contents of the image itself. A typical url looks like this:

http://ift.tt/1rzLMFs

As you can see, there's a 32-character hash and another 19-character hash. I've tried all of the hashing algorithms supported by PHP 5.4.24, but none of them produces either of these codes. I've looked at the useless tumblr api, and done some searching around, but I can't find anything about how these codes are generated. Does anyone outside of tumblr know?

asked 8 secs ago

GreatBigBore

1,174