using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace CS_SHA256
{
    class Program
    {
        static void Pause()
        {
            Console.Write("Press any key to continue...");
            Console.ReadKey(true);
        }
        public static string ToHexString(byte[] bytes)//16進制陣列轉字串 
        {
            string hexString = string.Empty;
            if (bytes != null)
            {
                StringBuilder str = new StringBuilder();

                for (int i = 0; i < bytes.Length; i++)
                {
                    str.Append(bytes[i].ToString("X2"));
                }
                hexString = str.ToString();
            }
            return hexString;
        }
        static void Main(string[] args)
        {
            SHA256 sha256 = new SHA256CryptoServiceProvider();//建立一個SHA256
            byte[] source = Encoding.Default.GetBytes("");//將字串轉為Byte[]
            byte[] crypto = sha256.ComputeHash(source);//進行SHA256加密 ~ https://emn178.github.io/online-tools/sha256.html e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
            Console.WriteLine("SHA256加密:" + ToHexString(crypto));
            string result = Convert.ToBase64String(crypto);//把加密後的字串從Byte[]轉為字串
            Console.WriteLine("SHA256+Base64 加密:" + result);//輸出結果
            Pause();
        }
    }
}