Open a file w/ htaccess (or advanced hotlinking protection)

Basically what I'm trying to do is prevent hotlinking in a fast, but effective, way. My plan was to require certain hotlinkable files to supply a hash when accessed like...
"http://somehost.com/protected/somebigfile?hash=a8d29e0"
The hash changes, so old hashes eventually stop working.The catch is, I can only use htaccess files, so I can't use RewriteMap, which would make this fairly easy.

I'd make a proxy-like php script, but that's too big of a performance hit. So I'm looking for a way to access the file with the latest hash, or just a script, and check them against an argument ("hash") in the query. Seems simple enough, but I can't find anything.

The server is Apache 1.3, and I don't have access to http.conf, unfortunately.
StaticreatorAsked:
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NopiusCommented:
It's impossible to control characters behind '?' without using rewrite rules or LocationMatch or some wrapper script.
rewrite rules and location are not permitted in .htaccess, so wrapper is the only solution. What is a problem with PHP script performance?

 
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StaticreatorAuthor Commented:
...what? Rewrite rules (mod_rewrite) are allowed in .htaccess files, my problem is that I can't check any rewrite rules against a hash.

From what I've read, the performance of any PHP wrapper would be much slower. As always, Apache handles sending static files much better than anything I could ever write, and I'd prefer to keep it that way.
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NopiusCommented:
If you have control over .htaccess, can write php script that will modify your .htaccess
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StaticreatorAuthor Commented:
Seems so obvious now. Thanks!
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