How to calculate md5 hash of a file using javascript

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While there are JS implementations of the MD5 algorithm, older browsers are generally unable to read files from the local filesystem.

I wrote that in 2009. So what about new browsers?

With a browser that supports the FileAPI, you can read the contents of a file – the user has to have selected it, either with an <input> element or drag-and-drop. As of Jan 2013, here’s how the major browsers stack up:

How?

See the answer below by Benny Neugebauer which uses the MD5 function of CryptoJS

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