C#学习（1）

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

namespace Application1
{
    class Program
    {
        static int counter = 0;
        static string displayString = "Things can only get better!";

        public static string SHA256(string str)
        {
            // 如果str有中文，不同Encoding的sha是不同的！！ 
            byte[] SHA256Data = Encoding.UTF8.GetBytes(str);

            SHA256Managed Sha256 = new SHA256Managed();

            byte[] by = Sha256.ComputeHash(SHA256Data);

            return BitConverter.ToString(by).Replace("-", "").ToLower(); // 64 
            // return Convert.ToBase64String(by);                        // 44 
        }

        static void Main(string[] args)
        {
          
            string strPassword = "12345678";
            
            string sha = SHA256(strPassword);

            Console.WriteLine("SHA256:{0}", sha);

            Console.ReadKey();
        }

    }
}

代码

//如果是文本，先转换为字节序列，如果有汉字，请不要使用 ASCII 编码，会导致汉字变成问号
byte[] buffer = Encoding.UTF8.GetBytes("洪星的博客");//UTF-8 编码
buffer = Encoding.Default.GetBytes("洪星的博客");//GBK/GB2312 编码


//16字节,128位
MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
byte[] h1 = MD5.ComputeHash(buffer);


//20字节,160位
SHA1CryptoServiceProvider SHA1 = new SHA1CryptoServiceProvider();
byte[] h2 = SHA1.ComputeHash(buffer);


//32字节,256位
SHA256CryptoServiceProvider SHA256 = new SHA256CryptoServiceProvider();
byte[] h3 = SHA256.ComputeHash(buffer);


//48字节,384位
SHA384CryptoServiceProvider SHA384 = new SHA384CryptoServiceProvider();
byte[] h4 = SHA384.ComputeHash(buffer);


//64字节,512位
SHA512CryptoServiceProvider SHA512 = new SHA512CryptoServiceProvider();
byte[] h5 = SHA512.ComputeHash(buffer);


string s1 = BitConverter.ToString(h1).Replace("-", string.Empty);
string s2 = BitConverter.ToString(h2).Replace("-", string.Empty);
string s3 = BitConverter.ToString(h3).Replace("-", string.Empty);
string s4 = BitConverter.ToString(h4).Replace("-", string.Empty);
string s5 = BitConverter.ToString(h5).Replace("-", string.Empty);


Console.WriteLine(s1);
Console.WriteLine(s2);
Console.WriteLine(s3);
Console.WriteLine(s4);
Console.WriteLine(s5);

  public static CookieContainer GetCooKie(string url, string postdata, HttpHeader header)
        {
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            try
            {
                CookieContainer cc = new CookieContainer();
                request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = header.method;
                request.ContentType = header.contentType;
                byte[] postdatabyte = Encoding.UTF8.GetBytes(postdata);
                request.ContentLength = postdatabyte.Length;
                request.AllowAutoRedirect = false;
                request.CookieContainer = cc;
                request.KeepAlive = true;
 
                //提交请求
                Stream stream;
                //stream = request.GetRequestStream();
                stream.Write(postdatabyte, 0, postdatabyte.Length);
                stream.Close();
 
                //接收响应
                //response = (HttpWebResponse)request.GetResponse();
                response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);
 
                CookieCollection cook = response.Cookies;
                //Cookie字符串格式
                string strcrook = request.CookieContainer.GetCookieHeader(request.RequestUri);
                Console.WriteLine(strcrook);
                return cc;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                throw ex;
            }
        }