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Although Google Docs documents seem to have a unique ID in the URL, I'm wondering if there is a way to get a hash (MD5, SHA1) of a document without downloading it again. Has anyone attempted something similar? Is there some API call I can make?

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There is an API call, documented in at the link.

md5Checksum: string, An MD5 checksum for the content of this file. This is populated only for files with content stored in Drive.

In java you can retrieve it by adding a line to this java example

 System.out.println("MD5: " + file.getMd5Checksum());
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Hashify.me stores the entire content of a webpage in its url.
Type your text in the editor box (supports Markdown) and watch the url self-updating instantly in your adress bar.

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That's an interesting concept, but not really related to my question. I'm looking for one-way hashes (digital signatures) for my files already stored on Google Docs. – technomalogical May 20 '11 at 20:11

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