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2008-08-30 置頂文章

C# 加密(Encrypt) 解密(Decrypt) 使用DESCryptoServiceProvider

C# 加密(Encrypt) 解密(Decrypt) 使用DESCryptoServiceProvider

C# 加密(Encrypt) 解密(Decrypt) 使用DESCryptoServiceProvider

如下

Security.cs

 

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;  

namespace Clib
{
    /// <!--Security類別-->
    /// <summary>
    /// Security類別 - design By Phoenix 2008 -
    /// </summary>
    public class Security
    {
        private string _Key;
        private string _IV;

        /// <summary>
        /// 加密金鑰(8個英文字)
        /// </summary>
        public string Key
        {
            set
            {
                _Key = value.Length == 8 ? value : "PhoenixK";
            }
        }
        /// <summary>
        /// 初始化向量(8個英文字)
        /// </summary>
        public string IV
        {
            set
            {
                _IV = value.Length == 8 ? value : "PhoenixI";
            }
        }

        /// <summary>
        /// 初始化 Clib.Security 類別的新執行個體
        /// </summary>
        public Security()
        {
            _Key = "PhoenixK";
            _IV = "PhoenixI";
        }

        /// <summary>
        /// 初始化 Clib.Security 類別的新執行個體
        /// </summary>
        /// <param name="newKey">加密金鑰</param>
        /// <param name="newIV">初始化向量</param>
        public Security(string newKey,string newIV)
        {
            this.Key = newKey;
            this.IV = newIV;
        }

        /// <!--加密字串-->
        /// <summary>
        /// 加密字串 - design By Phoenix 2008 -
        /// </summary>
        /// <param name="value">加密的字串</param>
        /// <returns>加密過後的字串</returns>
        public string Encrypt(string value)
        {
            return Encrypt(value, _Key,_IV);
        }

        /// <!--解密字串-->
        /// <summary>
        /// 解密字串 - design By Phoenix 2008 -
        /// </summary>
        /// <param name="value">解密的字串</param>
        /// <returns>解密過後的字串</returns>
        public string Decrypt(string value)
        {
            return Decrypt(value, _Key,_IV);
        }

        /// <!--DEC 加密法 -->
        /// <summary>
        /// DEC 加密法 - design By Phoenix 2008 -
        /// </summary>
        /// <param name="pToEncrypt">加密的字串</param>
        /// <param name="sKey">加密金鑰</param>
        /// <param name="sIV">初始化向量</param>
        /// <returns></returns>
        private string Encrypt(string pToEncrypt, string sKey,string sIV)
        {
            StringBuilder ret = new StringBuilder();
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                //將字元轉換為Byte
                byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
                //設定加密金鑰(轉為Byte)
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                //設定初始化向量(轉為Byte)
                des.IV = ASCIIEncoding.ASCII.GetBytes(sIV);

                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                    }
                    //輸出資料
                    foreach (byte b in ms.ToArray())
                        ret.AppendFormat("{0:X2}", b);
                }
            }
            //回傳
            return ret.ToString();
        }

        /// <!--DEC 解密法-->
        /// <summary>
        /// DEC 解密法 - design By Phoenix 2008 -
        /// </summary>
        /// <param name="pToDecrypt">解密的字串</param>
        /// <param name="sKey">加密金鑰</param>
        /// <param name="sIV">初始化向量</param>
        /// <returns></returns>
        private string Decrypt(string pToDecrypt, string sKey, string sIV)
        {
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {

                byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
                //反轉
                for (int x = 0; x < pToDecrypt.Length / 2; x++)
                {
                    int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                    inputByteArray[x] = (byte)i;
                }
                //設定加密金鑰(轉為Byte)
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                //設定初始化向量(轉為Byte)
                des.IV = ASCIIEncoding.ASCII.GetBytes(sIV);
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        //例外處理
                        try
                        {
                            cs.Write(inputByteArray, 0, inputByteArray.Length);
                            cs.FlushFinalBlock();
                            //輸出資料
                            return System.Text.Encoding.Default.GetString(ms.ToArray());
                        }
                        catch (CryptographicException)
                        {
                            //若金鑰或向量錯誤，傳回N/A
                            return "N/A";
                        }
                    }
                }
            }
        }

        /// <!--驗證加密字串-->
        /// <summary>
        /// 驗證加密字串 - design By Phoenix 2008 -
        /// </summary>
        /// <param name="EnString">加密後的字串</param>
        /// <param name="FoString">加密前的字串</param>
        /// <returns>是/否</returns>
        public bool ValidateString(string EnString, string FoString)
        {
            //呼叫Decrypt解密
            //判斷是否相符
            //回傳結果
            return Decrypt(EnString, _Key,_IV) == FoString.ToString() ? true : false;
        }
    }
}

 

 

測試頁面text.aspx(空白的)

 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    </div>
    </form>
</body>
</html>

 

text.aspx.cs

 

using System;
using Clib;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Security mySecurity = new Security();

        string sample = "This is Sample Code！";
        string mycode = mySecurity.Encrypt(sample);

        Response.Write("sample = " + sample + "<br />");
        Response.Write("mycode = " + mycode + "<br />");
        Response.Write("Decrypt(mycode) = " + mySecurity.Decrypt(mycode) + "<br />");
        Response.Write("ValidateString(mycode,sample) = " + mySecurity.ValidateString(mycode, sample) + "<br />");
    }
}

執行畫面

 

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