using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        string key = "PSCKPK_1";

        string raw_data = "PSCKPKPsC@456987!PSCKPKFEEC00000008000001PSCGR001173011340602700000123456";

        byte[]saltBytes = System.Text.UnicodeEncoding.UTF8.GetBytes(key);

        Sign_String(raw_data, saltBytes); // method calls 

    }

    public static void Sign_String(string plaintext,byte[] saltBytes) 

        {

            // Convert plain text into a byte array.

            byte[] plainTextBytes = System.Text.UnicodeEncoding.UTF8.GetBytes(plaintext);

            // Allocate array, which will hold plain text and salt.

            byte[] plainTextWithSaltBytes = new byte[plainTextBytes.Length + saltBytes.Length];

            // Copy plain text bytes into resulting array.

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

            {

                plainTextWithSaltBytes[i] = plainTextBytes[i];

            }

            // Append salt bytes to the resulting array.

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

            {

                plainTextWithSaltBytes[plainTextBytes.Length + i] = saltBytes[i];

            }

            //return Convert.ToBase64String(plainTextWithSaltBytes);

            HashAlgorithm hash = new SHA512Managed();

            // Compute hash value of our plain text with appended salt.

            byte[] hashBytes = hash.ComputeHash(plainTextWithSaltBytes);

            // Convert result into a base64-encoded string.

        for(int k=0; k < plainTextWithSaltBytes.Length; k++){    

            Console.Write(plainTextWithSaltBytes[k]);

            }

            string hashValue = Convert.ToBase64String(hashBytes);

            //Console.WriteLine(hashValue);

            //return hashValue;

        }

}