Create a HMac Sha256 hash from a given string

HMacSha256.scala

  object HMAC {
    def generateHMAC(sharedSecret: String, input: String): String = {
      val secret = new SecretKeySpec(sharedSecret.getBytes, "HmacSHA256") //Crypto Funs : 'SHA256' , 'HmacSHA1'
      val mac = Mac.getInstance("HmacSHA256")
      mac.init(secret)
      val hashString: Array[Byte] = mac.doFinal(input.getBytes)
      // this makes sure that the string is 64chars long and gets padded with 0 if its shorter
      String.format("%064x", new BigInteger(1, hashString))
    }

  }