class Aws::Signers::V4

def signature(request, datetime)
  k_secret = credentials.secret_access_key
  k_date = hmac("AWS4" + k_secret, datetime[0,8])
  k_region = hmac(k_date, region)
  k_service = hmac(k_region, service_name)
  k_credentials = hmac(k_service, 'aws4_request')
  hexhmac(k_credentials, string_to_sign(request, datetime))
end