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I would like to generate SHA1 or similar hashes using only client-side Javascript. In other words, using the Javascript engines provided with IE, FF, and Webkit. I am wondering what hash implementations exist?

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    There exist many. Google is your friend. (Example: webtoolkit.info/javascript-sha1.html ) Commented Mar 9, 2012 at 17:53
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    @user1150525 - I think the OP is looking for an implementation using only the JS engine in the browser. I was just searching for the same thing myself last night to avoid a dependency on a third party library. Commented Mar 9, 2012 at 18:14

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I don't believe there are any built directly into the browser, but there are some well-documented implementations.

The best I have found is http://code.google.com/p/crypto-js/ which is available via CDN and supports:

  • MD5
  • SHA-1
  • SHA-256
  • AES
  • DES
  • Rabbit
  • MARC4
  • HMAC
  • HMAC-MD5
  • HMAC-SHA1
  • HMAC-SHA256
  • PBKDF2

If security matters then use an algorithm that hasn't been broken (yet) and is less subject to various forms of attack (wikipedia has a nice breakdown at the bottom of this article).

Based on the lack of answers to this question, it doesn't seem like this is native browser functionality. I wish there was, but I could see issues arising from relying on the browser. For example, if a flaw was discovered in an algorithm, it would be difficult to move your users to a new algorithm until you knew all of their browsers supported it (and they had upgraded). If you control the hashing algorithm, then you can deploy a new script whenever you wish.

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I'm not sure about built-in hash implementations other than what's already used for associative arrays, but here are some sample implementations with code.

SHA

MD5 (with some others included)

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I also found Mootool's version and this gist.
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Movable Type has published a js implementation of SHA1 here: http://www.movable-type.co.uk/scripts/sha1.html

I'm sure there are plenty of other implementations.

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