Creating Data Sign

HMAC-SHA-256 (RFC 2104) is used for checking the integrity of the data sent between the systems. The flow for the creation of the sign is the following:

• A message is created as a concatenation of parameters in a specified order.
• A HMAC-SHA-256 code (32 bytes) is generated using a key, which is associated with the customer.
• The code is converted into a string that is a hexadecimal representation of the code (64 uppercase characters).

Code Samples

Test your sign computing implementation for a sample operation using the following data:

Concatenating parameters we get input into the hash function Player0112.30USD473285True.

Please note that the amount always has to be adjusted to exactly 2 decimal places.

Using the hash function and secret key 1234567890 we get hash (converted to hexadecimal).

4786EEBD8BCBED542D4402A69378AB279494C62A9E96019A20A59F8D2B4F8A98.

HMAC Generator website - https://www.freeformatter.com/hmac-generator.html

Below we provide examples of code computing SIGN in some of the major programming languages.

.NET framework 2.0 (C#)

public static string GetSign(string key, string message) {
  System.Security.Cryptography.HMAC hmac =
  System.Security.Cryptography.HMAC.Create("HMACSHA256");
  hmac.Key = System.Text.Encoding.UTF8.GetBytes(key);
  byte[] hash = hmac.ComputeHash(System.Text.Encoding.UTF8.GetBytes(message));
  return BitConverter.ToString(hash).Replace("-", "").ToUpperInvariant();
  }

PHP

function GetSign($key, $message) {
  return strtoupper(hash_hmac('sha256', pack('A*', $message), pack('A*', $key)));
  }

JAVA

public static String GetSign(String key, String message) throws Exception {
  javax.crypto.Mac mac = javax.crypto.Mac.getInstance("HmacSHA256");
  byte[] keyBytes = key.getBytes("UTF-8");
  byte[] messageBytes = message.getBytes("UTF-8");
  mac.init(new javax.crypto.spec.SecretKeySpec(keyBytes, mac.getAlgorithm()));
  return ByteArray2HexString(mac.doFinal(messageBytes));
  }

public static String ByteArray2HexString(byte[] b) {
  java.math.BigInteger bi = new java.math.BigInteger(1, b);
  return String.format("%0" + (b.length << 1) + "X", bi);
  }