Are there any one-way hashing functions available in native JavaScript?

Question

I'd like to be able to create unique tokens* for users based on a hashed string. I know I could, for example, use a md5() library but as the purpose is not cryptographic I was wondering if there was anything I could use "out of the box." Are there any one-way hashing functions available in native JavaScript?

*I realize these won't be strictly unique. I'm ok with a small chance of hashing collision.

Answer 1

In 2020, there is a native API:

SubtleCrypto.digest()

https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest

example:

crypto.subtle   .digest("SHA-256", new TextEncoder().encode("hello"))   .then(console.log); 

hex string conversion:

const digest = async ({ algorithm = "SHA-256", message }) =>   Array.prototype.map     .call(       new Uint8Array(         await crypto.subtle.digest(algorithm, new TextEncoder().encode(message))       ),       (x) => ("0" + x.toString(16)).slice(-2)     )     .join("");  digest({message: "hello"}).then(console.log)

Answer 2

JavaScript does not have native hashing, but there are many libraries.

I recommend crypto-js: https://code.google.com/p/crypto-js/

For example, to use SHA1, you simply:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/sha1.js"></script> <script>     var hash = CryptoJS.SHA1("Message"); </script>