從網(wǎng)上找到了一些相關(guān)的資料然后自己試著做了一下覺(jué)得收益匪淺。其實(shí)對(duì)MD5的加密解密，我們知道怎么調(diào)用就好了，其實(shí)也沒(méi)有什么太多的必要去看其算法。以下代碼希望對(duì)觀望的讀者有用。

MD5加密解密的兩個(gè)類：

其中的一個(gè)加密解密類：

using System;
using System.Collections.Generic;
using System.Text;
using System.Globalization;
using System.Security.Cryptography;
using System.IO;
namespace WindowsApplication2
{
    class DES
    {
        // 創(chuàng)建Key
        public string GenerateKey()
        {
            DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
            return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
        }
        ///MD5加密
        public string MD5Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();

        }

        ///MD5解密
        public string MD5Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }

    }
}

另外一個(gè)加密解密類：

using System;
using System.Text;
using System.IO;
using System.Globalization;
using System.Security.Cryptography;
using System.Collections.Generic;

namespace WindowsApplication2
{
    class MD5
    {
        // 創(chuàng)建Key
        public string GenerateKey()
        {
            DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
            return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
        }
        // 加密字符串
        public string EncryptString(string sInputString, string sKey)
        {
            byte[] data = Encoding.UTF8.GetBytes(sInputString);
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            ICryptoTransform desencrypt = DES.CreateEncryptor();
            byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
            return BitConverter.ToString(result);
        }
        // 解密字符串
        public string DecryptString(string sInputString, string sKey)
        {
            string[] sInput = sInputString.Split("-".ToCharArray());
            byte[] data = new byte[sInput.Length];
            for (int i = 0; i < sInput.Length; i++)
            {
                data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
            }
            DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
            DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            ICryptoTransform desencrypt = DES.CreateDecryptor();
            byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
            return Encoding.UTF8.GetString(result);
        }

    }
}

調(diào)用這兩個(gè)類：

public partial class EDForm : Form
    {
        public EDForm()
        {
            InitializeComponent();
        }
        DES des = new DES();
        string key = null;
        /// <summary>
        /// 加密字符串
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            key = des.GenerateKey();
            this.textBox2.Text = des.MD5Encrypt(textBox1.Text,key);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MessageBox.Show(des.MD5Decrypt(textBox2.Text, key));
        }
    }