companies.rb

def gimme_yo_stuff
  time = Time.now.httpdate
  YOUR HTTP LIBRARY.GET(path, :headers=> {
    "Accept" => ACCEPT,
    "Date"=>time,
    "Authorization"=>"#{@key_id}:#{signature_for_path(path, 'GET', time)}"
  })
end
          
def signature_for_path(path, method, time)
  payload = string_to_sign(method, path, time)
  digest = OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha256'), @secret, payload)
  # this nonsense is base64 encoding, you may or may not have to remove the \n from your
  # digests, depends how your library works
  [digest].pack('m').gsub("\n", '')
end

def string_to_sign(method, path, time)
  [method, HOST, path, time, @key_id, ACCEPT, ''].join("\n")
end

hmac.py

>>> payload = 'lulz'
>>> import hashlib
>>> import hmac
>>> import base64
>>> h = hmac.new("YOUR SECRET", payload, hashlib.sha256)
>>> h = hmac.new("YOUR SECRET", payload, hashlib.sha256)
>>> d = h.digest()
>>> base64.b64encode(d)
'AKdJyTNPtw+rFru9gl/pb6Wf5OBu/12ycZN/i+quCyU='