Question:
{ "foo": "bar", "bar": "baz", "baz" : { "nestedKey": "foo" } }
In order to sign this request using the Hmac512 algorithm, I must first stringify the object.
I am concerned that if the key order is not preserved, the generated signature on the server and client side may differ.
To address this concern, my solution is to alphabetically sort the keys of the object (including nested keys).
How can I implement this sorting process?
The original post emphasizes the importance of having a deterministic input for the HMAC process.
It is worth noting that in JavaScript, the order of object elements cannot be controlled, despite our best efforts to do so. This issue tends to surface periodically.
The solution is to sort the stringified version of the string itself before passing it into the HMAC method.
You can explore using json-stable-stringify as a tool to address this challenge.
Simply provide the resulting sorted string as input to the HMAC method without requiring base64 encoding.
It is important to make sure that the message is consistent on both ends without any alterations or adjustments needed.
In essence, follow this algorithm:
base64(sign(utf8(json message)))
On the Client Side:
Stringify: Convert the JavaScript object into a string
UTF-8: Use a standardized encoding such as UTF-8
Sign: Compute HMAC over the resulting message
base64: Change the binary signature to base64 format
Send the JSON message and the signature to the client
On the Server Side:
Receive the original message from the client and execute steps 2-4. Verify if the signatures match
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