Question

136

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

rated 0 times [ 140] [ 4] / answers: 1 / hits: 39752 / 14 Years ago, thu, february 24, 2011, 12:00:00

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.

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chyanne

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2 Years ago

answered 14 Years ago karivictoriab · Accepted Answer

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)