C#DES加密解密字串

標籤：c#、des、加密解密、字串

1.添加引用

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

2.添加預設密匙向量

//預設密鑰向量private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

3.添加加密解密類

/// <summary>/// DES加密字串/// </summary>/// <param name="encryptString">待加密的字串</param>/// <param name="encryptKey">加密金鑰,要求為8位</param>/// <returns>加密成功返回加密後的字串，失敗返回源串 </returns>public static string EncryptDES(string encryptString, string encryptKey){    try    {    byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));//轉換為位元組    byte[] rgbIV = Keys;    byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);    DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();//執行個體化資料加密標準    MemoryStream mStream = new MemoryStream();//執行個體化記憶體流    //將資料流連結到加密轉換的流    CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV),CryptoStreamMode.Write);    cStream.Write(inputByteArray, 0, inputByteArray.Length);    cStream.FlushFinalBlock();    return Convert.ToBase64String(mStream.ToArray());    }    catch    {        return encryptString;    }}/// <summary>/// DES解密字串/// </summary>/// <param name="decryptString">待解密的字串</param>/// <param name="decryptKey">解密密鑰,要求為8位,和加密金鑰相同</param>/// <returns>解密成功返回解密後的字串，失敗返源串</returns>public static string DecryptDES(string decryptString, string decryptKey){    try    {    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);    byte[] rgbIV = Keys;    byte[] inputByteArray = Convert.FromBase64String(decryptString);    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();    MemoryStream mStream = new MemoryStream();    CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV),CryptoStreamMode.Write);    cStream.Write(inputByteArray, 0, inputByteArray.Length);    cStream.FlushFinalBlock();    return Encoding.UTF8.GetString(mStream.ToArray());    }    catch    {        return decryptString;    }}

4.調用方法（在文章結尾，有相關類，編譯後直接調用即可）

//返回加密後的字串EncryptStrstring EncryptStr = EncryptDESString.EncryptDES("This is a Test", "password");  MessageBox.Show(EncryptStr);//解密字串EncryptStrstring DecryptStr = EncryptDESString.DecryptDES(EncryptStr, "password");MessageBox.Show(EncryptStr);

加密後：

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解密後：

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C#DES加密解密字串