using System;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        var created = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssZ");

        var nonceTime = DateTime.Now.ToString("yyyyMMddHHmmss00000");

        string password2 = "{    " + "\"instructedAmount\"" + 

            "knljhnkj";

string password = "{    " + (char)10 +

"   \"instructedAmount\": {\"currency\": \"EUR\", \"amount\": \"123\"}," + (char)10 +

"   \"debtorAccount\": {\"iban\": \"DE2310010010123456789\"}," + (char)10 +

"   \"creditor\": {\"name\": \"Merchant123\"}," + (char)10 +

"   \"creditorAccount\": {\"iban\": \"DE23100120020123456789\"}," + (char)10 +

"   \"remittanceInformationUnstructured\": \"Ref Number Merchant\"" + (char)10 +

"}";

        //string nonce = "2019089218023602300";

        var sha256 = ComputeSha256Hash(password);

        //sha256 = ComputeSha256Hash("2018042813023600002018-03-28T13:02:36ZbmeB500");

        Console.WriteLine("Created : " + created);

        Console.WriteLine("Nonce : " + nonceTime);

        Console.WriteLine("Using SHA 256 : " + sha256);

        Console.WriteLine("Raw String : " + password);

    }

    static string ComputeSha256Hash(string rawData)  

        {

            //var md5Hasher = MD5.Create();

            //var bytes = md5Hasher.ComputeHash(Encoding.Default.GetBytes(rawData));

            // Create a SHA256   

            string returnStr = "";

            using (SHA256 sha256Hash = SHA256.Create())  

            {  

                // ComputeHash - returns byte array  

                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));  

                returnStr = System.Convert.ToBase64String(bytes);

                // Convert byte array to a string   

                //StringBuilder builder = new StringBuilder();  

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

                //{  

                //    builder.Append(bytes[i].ToString("x2"));  

                //}  

                //return builder.ToString();  

            }  

        return returnStr;

        }

    static string ComputeSha1Hash(string rawData)  

        {

            SHA1 sha = new SHA1CryptoServiceProvider();

            // This is one implementation of the abstract class SHA1.

            byte[] bytes = sha.ComputeHash(Encoding.UTF8.GetBytes(rawData));

            // ComputeHash - returns byte array  

                //byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));  

                // Convert byte array to a string   

                StringBuilder builder = new StringBuilder();  

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

                {  

                    builder.Append(bytes[i].ToString("x2"));  

                }  

                return builder.ToString();  

            }  

    static string ComputeMD5Hash(string rawData)  

        {

            var md5Hasher = MD5.Create();

            var bytes = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(rawData));

            // Create a SHA256   

                // Convert byte array to a string   

                StringBuilder builder = new StringBuilder();  

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

                {  

                    builder.Append(bytes[i].ToString("x2"));  

                }  

                return builder.ToString();    

        }

    public static string Base64Encode(string plainText) 

    {

        var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);

        return System.Convert.ToBase64String(plainTextBytes);

    }

}