HMAC.SHA256 in Elixir

telnyx_signature_example.exs

defmodule TelnyxSignature do
  @secret "rq789onm321yxzkjihfEdcAm"
  @encoded_result "lAjxaJDT5pwXpdnbhUwIQng8zicKOEw3wa4fvLDHhjI="
  @hash_input ~s[1520983646.{
    "sms_id":"834f3d53-8a3c-4aa0-a733-7f2d682a72df",
    "from": "+13129450002",
    "to": "+13125550001",
    "direction": "inbound",
    "body": "Hello!"
}
]

  def main() do
    IO.puts("MY_ENCODED_SIGNATURE:")
    create_hmac256(@hash_input) |> Base.encode64() |> IO.puts()
    IO.puts("\n")
    IO.puts("TELNYX_ENCODED_SIGNATURE: #{@encoded_result}")
  end

  def create_hmac256(input) do
    Plug.Crypto.MessageVerifier.sign(input, @secret, :sha256)
  end
end

TelnyxSignature.main()

Terminal Output

MY_ENCODED_SIGNATURE:
U0ZNeU5UWS5NVFV5TURrNE16WTBOaTU3Q2lBZ0lDQWljMjF6WDJsa0lqb2lPRE0wWmpOa05UTXRPR0V6WXkwMFlXRXdMV0UzTXpNdE4yWXlaRFk0TW1FM01tUm1JaXdLSUNBZ0lDSm1jbTl0SWpvZ0lpc3hNekV5T1RRMU1EQXdNaUlzQ2lBZ0lDQWlkRzhpT2lBaUt6RXpNVEkxTlRVd01EQXhJaXdLSUNBZ0lDSmthWEpsWTNScGIyNGlPaUFpYVc1aWIzVnVaQ0lzQ2lBZ0lDQWlZbTlrZVNJNklDSklaV3hzYnlFaUNuMEsuTXBuYUVNZzhXS0RCN0U5dS1BM3R6TWVJSkFFc3UtYnoyRWw0a2lWeFA5OA==


TELNYX_ENCODED_SIGNATURE: lAjxaJDT5pwXpdnbhUwIQng8zicKOEw3wa4fvLDHhjI=