Using HMAC SHA256 in Ruby

Question

I\'m trying to apply HMAC-SHA256 for generate a key for an Rest API.

I\'m doing something like this:

def generateTransactionHash(stringToHash)
  key          


        

Answer 1

In my case (Ticketmatic) I had to create the HMAC like above and add an Authorization header to the request with the HMAC in it.

hmac = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha256'), secret_key, access_key + name + time)
req = Net::HTTP::Get.new(uri)
req['Authorization'] = "TM-HMAC-SHA256 key=#{access_key} ts=#{time} sign=#{hmac}"
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }

You can find a full gist here

And a blogpost with more explantion here