Approach for signing message with HMAC (any recommendation for third party node?)

General
1

Hi!

I have a Python script that I would like to integrate into Node-RED. Essentially, it signs a message with HMAC/SHA256.

So far, I've attempted to implement Crypto-JS to create a function in Node-RED. However, this approach isn't very flexible if I want to share the flow with others and also I'havent succeed :frowning:

Perhaps someone has created a similar example using a third-party flow and can assist or guide me through the process.

def mymessagesigned(mysecret, message, randomh):
    random_header_bytes = randomh.encode('utf-8')
    shared_secret_bytes = mysecret.encode('utf-8')
    signature = hmac.new(shared_secret_bytes, digestmod=hashlib.sha256)
    signature.update(random_header_bytes)
    signature.update(message.encode('utf-8'))
    
    return signature.hexdigest()

thank you

2

Why not? You can simply add crypto to a function nodes settings tab. The flow will be exportable and importable by anyone who you share it with.

Have you tried the existing contrib nodes? Library - Node-RED

3

THX for the info

I only read the "functionglobacontext" but didn't read further
https://nodered.org/docs/user-guide/writing-functions#loading-additional-modules

With the settings tab it`s easy :slight_smile: thx

4

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