ASP.NET 常用的字符串加密

 ???????????????using System.Web.Security; ???????using System.Security.Cryptography; ???????/// <summary> ???????/// MD5函数 ???????/// </summary> ???????/// <param name="val">原始字符串</param> ???????/// <returns>MD5结果</returns> ???????public static string MD5String(string val) ???????{ ???????????if (val.Trim().Equals(String.Empty) == true) ???????????????return String.Empty; ???????????byte[] b = Encoding.UTF8.GetBytes(val); ???????????b = new MD5CryptoServiceProvider().ComputeHash(b); ???????????string ret = String.Empty; ???????????for (int i = 0; i < b.Length; i++) ???????????????ret += b[i].ToString("x").PadLeft(2, ‘0‘); ???????????return ret; ???????} ???????/// <summary> ???????/// SHA1字符串加密 ???????/// </summary> ???????/// <param name="obj"></param> ???????/// <returns></returns> ???????public static string SHA1(string obj) ???????{ ???????????return FormsAuthentication.HashPasswordForStoringInConfigFile(obj, "SHA1"); ???????} ???????/// <summary> ???????/// SHA256字符串加密 ???????/// </summary> ???????/// <param name="obj"></param> ???????/// <returns></returns> ???????public static string SHA256(string obj) ???????{ ???????????//return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(obj, "SHA256"); ???????????byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(obj); ???????????SHA256 sha256 = new SHA256Managed(); ???????????byte[] retVal = sha256.ComputeHash(bytValue); ???????????StringBuilder sb = new StringBuilder(); ???????????for (int i = 0; i < retVal.Length; i++) ???????????{ ???????????????sb.Append(retVal[i].ToString("x2")); ???????????} ???????????return sb.ToString(); ???????} ????????/// <summary> ???????/// Base64位加密 ???????/// </summary> ???????/// <param name="val"></param> ???????/// <returns></returns> ???????public static string EncryptBase64(string val) ???????{ ???????????return Convert.ToBase64String(Encoding.UTF8.GetBytes(val)); ???????} ???????/// <summary> ???????/// Base64位解密 ???????/// </summary> ???????/// <param name="val"></param> ???????/// <returns></returns> ???????public static string DecryptBase64(string val) ???????{ ???????????return Encoding.Default.GetString(Convert.FromBase64String(val)); ???????} ???????/// <summary> ???????/// BASE64位(MD5加密)[标准,非MD5加密再BASE64位加密] ???????/// </summary> ???????/// <param name="val">原始字符串</param> ???????/// <returns>MD5结果</returns> ???????public static string EncryptBase64AndMD5(string val) ???????{ ???????????if (val.Trim().Equals(String.Empty) == true) ???????????????return String.Empty; ???????????MD5CryptoServiceProvider MD5CSP = new MD5CryptoServiceProvider(); ???????????return Convert.ToBase64String(MD5CSP.ComputeHash(Encoding.UTF8.GetBytes(val))); ???????} ????

 ???????/// <summary> ???????/// DES加密字符串 ???????/// </summary> ???????/// <param name="encryptString">待加密的字符串</param> ???????/// <param name="encryptKey">加密密钥,要求为8位</param> ???????/// <returns>加密成功返回加密后的字符串,失败返回源串</returns> ???????public static string Encode(string encryptString, string encryptKey) ???????{ ???????????encryptKey = UtilsString.SubString(encryptKey, 8); ???????????encryptKey = encryptKey.PadRight(8, ‘ ‘); ???????????byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); ???????????byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; ???????????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()); ???????} ???????/// <summary> ???????/// DES解密字符串 ???????/// </summary> ???????/// <param name="decryptString">待解密的字符串</param> ???????/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> ???????/// <returns>解密成功返回解密后的字符串,失败返源串</returns> ???????public static string Decode(string decryptString, string decryptKey) ???????{ ???????????decryptKey = UtilsString.SubString(decryptKey, 8); ???????????decryptKey = decryptKey.PadRight(8, ‘ ‘); ???????????byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey); ???????????byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; ???????????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()); ???????}