C#中常涉及到對(duì)用戶密碼的加密于解密的算法，其中使用MD5加密是最常見的的實(shí)現(xiàn)方式。本文總結(jié)了通用的算法并結(jié)合了自己的一點(diǎn)小經(jīng)驗(yàn)，分享給大家。

一.使用16位、32位、64位MD5方法對(duì)用戶名加密

1）16位的MD5加密

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/// <summary> /// 16位MD5加密 /// </summary> /// <param name="password"></param> /// <returns></returns> public static string MD5Encrypt16(string password) { ??var md5 = new MD5CryptoServiceProvider(); ??string t2 = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(password)), 4, 8); ??t2 = t2.Replace("-", ""); ??return t2; }

2）32位的MD5加密

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/// <summary> /// 32位MD5加密 /// </summary> /// <param name="password"></param> /// <returns></returns> public static string MD5Encrypt32(string password) { ??string cl = password; ??string pwd = ""; ??MD5 md5 = MD5.Create(); //實(shí)例化一個(gè)md5對(duì)像 ??// 加密后是一個(gè)字節(jié)類型的數(shù)組，這里要注意編碼UTF8/Unicode等的選擇　 ??byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl)); ??// 通過使用循環(huán)，將字節(jié)類型的數(shù)組轉(zhuǎn)換為字符串，此字符串是常規(guī)字符格式化所得 ??for (int i = 0; i < s.Length; i++) ??{ ????// 將得到的字符串使用十六進(jìn)制類型格式。格式后的字符是小寫的字母，如果使用大寫（X）則格式后的字符是大寫字符 ????pwd = pwd + s[i].ToString("X"); ??} ??return pwd; }

3）64位的MD5加密

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public static string MD5Encrypt64(string password) { ??string cl = password; ??//string pwd = ""; ??MD5 md5 = MD5.Create(); //實(shí)例化一個(gè)md5對(duì)像 ??// 加密后是一個(gè)字節(jié)類型的數(shù)組，這里要注意編碼UTF8/Unicode等的選擇　 ??byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl)); ??return Convert.ToBase64String(s); }

4）使用MD5為用戶密碼加密

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/// <summary> /// 加密用戶密碼 /// </summary> /// <param name="password">密碼</param> /// <param name="codeLength">加密位數(shù)</param> /// <returns>加密密碼</returns> public static string md5(string password, int codeLength) { ??if (!string.IsNullOrEmpty(password)) ??{ ????// 16位MD5加密（取32位加密的9~25字符） ????if (codeLength == 16) ????{ ??????return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "MD5").ToLower().Substring(8, 16); ????} ????// 32位加密 ????if (codeLength == 32) ????{ ??????return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "MD5").ToLower(); ????} ??} ??return string.Empty; }

????? 由于MD5是不可逆的，所以加密之后就無法解密，取用戶名和密碼時(shí)候，需要再加密一邊用戶輸入的數(shù)據(jù)與數(shù)據(jù)庫中已加密的數(shù)據(jù)進(jìn)行比對(duì)。如果比對(duì)結(jié)果一致，則可以判定登陸成功！代碼如下所示：

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/// <summary> /// 登陸 /// </summary> public Model.UserInfo UserLogOn(string USERID, string pwd, out string statusCode) { ??//假設(shè)已經(jīng)通過用戶ID獲取到UserInfo的Model對(duì)象 ??Model.UserInfo model = GetModel(USERID); ??if (model != null) ??{ ????if (model.PASSWORD == MD5Encrypt64(pwd)) ????{ ??????statusCode = "登陸成功"; ????} ????else { ??????statusCode = “密碼錯(cuò)誤”； ????} ??} ??else ??{ ????statusCode = "用戶不存在！"; ????model = null; ??}? ??return model; }

5）通過DESCryptoServiceProvider對(duì)象對(duì)字符串進(jìn)行加密解密

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/// <summary> /// DES數(shù)據(jù)加密 /// </summary> /// <param name="targetValue">目標(biāo)值</param> /// <param name="key">密鑰</param> /// <returns>加密值</returns> public static string Encrypt(string targetValue, string key) { ??if (string.IsNullOrEmpty(targetValue)) ??{ ????return string.Empty; ??} ??var returnValue = new StringBuilder(); ??var des = new DESCryptoServiceProvider(); ??byte[] inputByteArray = Encoding.Default.GetBytes(targetValue); ??// 通過兩次哈希密碼設(shè)置對(duì)稱算法的初始化向量? ??des.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile ??????????????????????(FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5"). ????????????????????????Substring(0, 8), "sha1").Substring(0, 8)); ??// 通過兩次哈希密碼設(shè)置算法的機(jī)密密鑰? ??des.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile ??????????????????????(FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5") ????????????????????????.Substring(0, 8), "md5").Substring(0, 8)); ??var ms = new MemoryStream(); ??var cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); ??cs.Write(inputByteArray, 0, inputByteArray.Length); ??cs.FlushFinalBlock(); ??foreach (byte b in ms.ToArray()) ??{ ????returnValue.AppendFormat("{0:X2}", b); ??} ??return returnValue.ToString(); }

此種算法可以通過加密密鑰進(jìn)行解密，解密方法如下：

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/// <summary> /// DES數(shù)據(jù)解密 /// </summary> /// <param name="targetValue"></param> /// <param name="key"></param> /// <returns></returns> public static string Decrypt(string targetValue, string key) { ??if (string.IsNullOrEmpty(targetValue)) ??{ ????return string.Empty; ??} ??// 定義DES加密對(duì)象 ??var des = new DESCryptoServiceProvider(); ??int len = targetValue.Length / 2; ??var inputByteArray = new byte[len]; ??int x, i; ??for (x = 0; x < len; x++) ??{ ????i = Convert.ToInt32(targetValue.Substring(x * 2, 2), 16); ????inputByteArray[x] = (byte)i; ??} ??// 通過兩次哈希密碼設(shè)置對(duì)稱算法的初始化向量? ??des.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile ??????????????????????(FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5"). ????????????????????????Substring(0, 8), "sha1").Substring(0, 8)); ??// 通過兩次哈希密碼設(shè)置算法的機(jī)密密鑰? ??des.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile ??????????????????????(FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5") ????????????????????????.Substring(0, 8), "md5").Substring(0, 8)); ??// 定義內(nèi)存流 ??var ms = new MemoryStream(); ??// 定義加密流 ??var cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); ??cs.Write(inputByteArray, 0, inputByteArray.Length); ??cs.FlushFinalBlock(); ??return Encoding.Default.GetString(ms.ToArray()); }

以上內(nèi)容是基于C#對(duì)用戶密碼使用MD5加密與解密的全部敘述，希望大家喜歡。

轉(zhuǎn)載于:https://www.cnblogs.com/wanzhongjun/p/6583180.html

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