Convert PHP hash_hmac(sha512) to NodeJS

Question

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,

Jonas D. · Accepted Answer · 2017-06-27 14:06:00Z

9

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.)

edited Jun 27, 2017 at 14:06

Jonas D.

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answered Mar 13, 2013 at 19:25

Jacob Parker

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2 Comments

Nick Mitchinson Over a year ago

Tip when using this, I think you can only call the digest() method on a hash once. This means that you cannot use update(), followed by digest() to form another hash. If you need to form multiple hashes, you will have to use crypto.createHmac() multiple times.

Jacob Parker Over a year ago

Yes, this is correct as far as I know. Thanks, I'll update my answer.

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