Method extendedHmacSha256

java/lib/src/main/java/io/github/ccxt/Exchange.java:3038–3047

(byte[] key, byte[] data)

    }

    private static byte[] extendedHmacSha256(byte[] key, byte[] data)
    {
        try {
            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(new SecretKeySpec(key, "HmacSHA256"));
            return mac.doFinal(data);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static byte[] extendedBytesConcat(byte[]... arrays)
    {