How do I hash a string using JavaScript with sha512 algorithm

Question

I've tried using sha512 from NPM but it keeps hashing the wrong thing i.e I am supposed to get a string but it keeps returning object. So in PHP I know I can perform the task $hash = hash("sha512","my string for hashing");

How do I perform this task on nodejs JavaScript

Most browsers have a Crypto API and there's a SHA256 demo If you want to use a third-party library, you need to specify which library you used. — Filip Dimitrovski
– Filip Dimitrovski, Commented Apr 30, 2019 at 17:54
sha512 github page says This library is deprecated. While browsing npm atleast check if it's actively maintained. github.com/cryptocoinjs/sha512 — 1565986223
– 1565986223, Commented Apr 30, 2019 at 17:57
Yes I remembered I logged this deprecation error earlier and I was wondering why because I've tried different libraries on NPM. I'll try cryptocoinjs out. — Toheeb
– Toheeb, Commented Apr 30, 2019 at 18:02
@Lewis Apologies for the accusation! Yes it's a warning that breaks the API. The code literally stops running at that point and won't return anything. I'll have to make changes and restart the server to make it work again. Again I'm sorry for accusing you wrongly. — Toheeb
– Toheeb, Commented May 1, 2019 at 12:39

Filip Dimitrovski · Accepted Answer · 2019-10-08 18:32:08Z

58

If you are using Node:

> crypto.createHash('sha512').update('my string for hashing').digest('hex');
'4dc43467fe9140f217821252f94be94e49f963eed1889bceab83a1c36ffe3efe87334510605a9bf3b644626ac0cd0827a980b698efbc1bde75b537172ab8dbd0'

If you want to use the browser Web Crypto API:

function sha512(str) {
  return crypto.subtle.digest("SHA-512", new TextEncoder("utf-8").encode(str)).then(buf => {
    return Array.prototype.map.call(new Uint8Array(buf), x=>(('00'+x.toString(16)).slice(-2))).join('');
  });
}

sha512("my string for hashing").then(x => console.log(x));
// prints: 4dc43467fe9140f217821252f94be94e49f963eed1889bceab83a1c36ffe3efe87334510605a9bf3b644626ac0cd0827a980b698efbc1bde75b537172ab8dbd0

edited Oct 8, 2019 at 18:32

answered Apr 30, 2019 at 17:59

Filip Dimitrovski

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10 Comments

WiseDev Over a year ago

why does it say sha256, when OP asked for sha512?

Filip Dimitrovski Over a year ago

@BlueRineS Edited.

SOFe Over a year ago

Note: Chrome thinks that you do not deserve to use hashing functions if you can't make yourself an SSL certificate for things running over your intranet. w3.org/2016/08/29-crypto-minutes.html

jaybhatt Over a year ago

In the map function call, do we really need to do ('00' + x.toString(16)).slice(-2)? Wouldn't slice(-2), return the same result irrespectively?

Lampe2020 Sep 29 at 23:11

If x.toString() is single-digit, the '00' + inserts an extra 0 to make sure the map call always returns two characters. But I see no reason for there to be two zeroes in the string, because even if x was 0, adding a single 9 would suffice to make it 2 zeroes.

Martin Dec 3, 2024 at 16:56

The posted code is quite similar to the example on mdn (which isn't meant as critique, just an observation) and I found the mdn example has better readability, so I ended up using the mdn snippet. Plus the code posted here has some strange unexplained or slightly incorrect artifacts: the TextEncoder ctor doesn't have any params, the .slice(-2) isn't explained and doesn't look right, the Array.prototype.map.call() I'd rather replace with Array.from() and .map() for sanity.

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user-id-14900042 · Accepted Answer · 2024-08-10 13:48:56Z

0

You can use js-sha512 package from NPM if you are working on environment that does not have standard crypto properties.

Example:

import { sha512 } from "js-sha512";

const originalMessage = "hello"
const hash = sha512.digest(secretKey, str);

Side note: you will get different result if you hash the message with HMAC. HMAC includes your secret into hash.

edited Aug 10, 2024 at 13:48

user-id-14900042

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answered Sep 4, 2022 at 11:52

pabios

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1 Comment

Deenadhayalan Manoharan Over a year ago

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review

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