using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(SHA256HexHashString("{\"CorporateID\":\"BCAAPI2016\",\"SourceAccountNumber\":\"0201245680\",\"TransactionID\":\"00000001\",\"TransactionDate\":\"2017-09-13\",\"ReferenceID\":\"refID\",\"CurrencyCode\":\"IDR\",\"Amount\":\"10000\",\"BeneficiaryAccountNumber\":\"0201245681\",\"Remark1\":\"Transfer Test\",\"Remark2\":\"Online Transfer\"}"));

    }

​

    private static string ToHex(byte[] bytes, bool upperCase)

    {

        StringBuilder result = new StringBuilder(bytes.Length * 2);

        for (int i = 0; i < bytes.Length; i++)

            result.Append(bytes[i].ToString(upperCase ? "X2" : "x2"));

        return result.ToString();

    }

​

    private static string SHA256HexHashString(string StringIn)

    {

        string hashString;

        using (var sha256 = SHA256Managed.Create())

        {

            var hash = sha256.ComputeHash(Encoding.Default.GetBytes(StringIn));

            hashString = ToHex(hash, false);

        }

​

        return hashString;

    }

}