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I am porting a php script to node, and I don't know much about encryption.
The php script uses this function:
hash_hmac('sha512', text, key);
So, I need to implement a function in Node js for returning a keyed hash using the hmac method (SHA512).
From what I can see, node has this functionality built in via the crypto module (http://nodejs.org/docs/latest/api/crypto.html#crypto_crypto) -- But I unclear how to reproduce this function.
Any help would be appreciated.
Thanks,
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Blog About MENU How to create a SHA-256 hash in Node.js? Published November 14, 2020 To create a SHA-256hash, you need to import or require the cryptomodule and use the createHmac()method in Node.js. Skip to the full code First, let's require the cryptomodule in Node.js, // get crypto moduleconstcrypto = require("crypto");
To create a hash from strings you just need a few lines in nodejs: The great thing about the nodejs implementation of Hash is the possibility to stream data directly into the hash: Happy Hashing. If you have any questions contact me via Twitter @chri_hartmann or Github Ready for ES6?
The hash_hmac() function is an inbuilt function in PHP which is used to generate the keyed hash value using the HMAC method. Syntax: string hash_hmac( $algo, $msg, $key, $raw_opt )
It is called update()since it also accepts a continuous stream of data like a buffer. Finally, after calling the update()method we need to define the output format for the hash. It can be hex, binary, or base64. We can define it using the digest()method on the object returned from the update()method like so,
Yes, use the crypto library.
var hash = crypto.createHmac('sha512', key);
hash.update(text);
var hashed_data = hash.digest();
More details (e.g. arguments to digest to control the output encoding from hash.digest) are at the link you provided.
As Nick points out, you will need to do this entire process each time you want to encrypt a new string (i.e. create a new hash object via crypto.createHmac.)
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