這里寫自定義目錄標題

• 數據加密
• • 可逆加密
  • 不可逆加密

數據加密

數據加密分為可逆和不可逆的。

可逆加密

//默認密鑰向量private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };private static string DESKey = "CQYRZHXG";/// <summary>/// <summary>/// 加密【可逆】/// </summary>/// <param name="Text">需要加密的字符串</param>/// <returns></returns>public static string Encrypt(string Text){return EncryptDES(Text, DESKey);}/// <summary> /// 加密數據/// </summary> /// <param name="Text"></param> /// <param name="sKey"></param> /// <returns></returns> /// DES加密字符串/// </summary>/// <param name="encryptString">待加密的字符串</param>/// <param name="encryptKey">加密密鑰,要求為8位</param>/// <returns>加密成功返回加密后的字符串，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));byte[] rgbIV = Keys;byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();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>/// 解密/// </summary>/// <param name="Text">需要解密的字符串</param>/// <returns></returns>public static string Decrypt(string Text){if (!string.IsNullOrEmpty(Text)){return DecryptDES(Text, DESKey);}else{return "";}}/// <summary>/// DES解密字符串/// </summary>/// <param name="decryptString">待解密的字符串</param>/// <param name="decryptKey">解密密鑰,要求為8位,和加密密鑰相同</param>/// <returns>解密成功返回解密后的字符串，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;}}/// <summary>/// Base64加密，采用utf8編碼方式加密/// </summary>/// <param name="source">待加密的明文</param>/// <returns>加密后的字符串</returns>public static string Base64Encode(string source){return Base64Encode(Encoding.UTF8, source);}/// <summary>/// Base64加密/// </summary>/// <param name="encodeType">加密采用的編碼方式</param>/// <param name="source">待加密的明文</param>/// <returns></returns>public static string Base64Encode(Encoding encodeType, string source){string encode = string.Empty;byte[] bytes = encodeType.GetBytes(source);try{encode = Convert.ToBase64String(bytes);}catch{encode = source;}return encode;}/// <summary>/// Base64解密，采用utf8編碼方式解密/// </summary>/// <param name="result">待解密的密文</param>/// <returns>解密后的字符串</returns>public static string Base64Decode(string result){return Base64Decode(Encoding.UTF8, result);}/// <summary>/// Base64解密/// </summary>/// <param name="encodeType">解密采用的編碼方式，注意和加密時采用的方式一致</param>/// <param name="result">待解密的密文</param>/// <returns>解密后的字符串</returns>public static string Base64Decode(Encoding encodeType, string result){string decode = string.Empty;byte[] bytes = Convert.FromBase64String(result);try{decode = encodeType.GetString(bytes);}catch{decode = result;}return decode;}

注意：加密后的字符串可能包含‘/’或‘+’等特殊字符，所以若前端拿到后需要再次傳入后臺，那就需要轉碼【
例如：
某個請求返回加密后的數據，加密后返回的字符串為“2jsd9sdje+jxidnwmi/6==” 若直接將再次它傳回臺進行解密時，后臺接收到的將會是“2jsd9sdje jxidnwmi/6==”，會將’+‘轉為空格。所以需要進行轉碼：encodeURIComponent（“2jsd9sdje+jxidnwmi/6==”）這樣后臺接收到的就是原來的加密后的字符串了
】

不可逆加密

/// <summary>/// 用戶密碼加密【不可逆】/// </summary>/// <param name="userPwd">用戶密碼</param>/// <returns></returns>public string UserPwdEncrypt(string userPwd){if (string.IsNullOrEmpty(userPwd)) userPwd = "";MD5 md5Hash = MD5.Create();byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(userPwd));// Create a new Stringbuilder to collect the bytes// and create a string.StringBuilder sBuilder = new StringBuilder();// Loop through each byte of the hashed data // and format each one as a hexadecimal string.for (int i = 0; i < data.Length; i++){sBuilder.Append(data[i].ToString("x2"));}// Return the hexadecimal string.return sBuilder.ToString();}

總結

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