C # Encryption Class,

C # Encryption Class,

Var es = EncryptSugar. getInstance (); string word = "abc"; var wordEncrypt = es. encrypto (word); // encrypt var wordDecrypt = es. decrypto (wordEncrypt); // decrypt var wordMd5 = es. MD5 (word); // md5 Encryption

　　

 

Using System; using System. collections. generic; using System. text; using System. security. cryptography; using System. xml; using System. IO; using System. linq; namespace SyntacticSugar {// <summary> /// ** Description: Encryption Class // ** Creation Time: // ** modification time: -/// ** Author: sunkaixuan // ** usage instructions: http://www.cnblogs.com/sunkaixuan/p/4610729.html /// </Summary> public class EncryptSugar {private static readonly object _ instanceLock = new object (); private static EncryptSugar _ instance = null; private static encryption ricalgorithm mobjCryptoService; private static string _ key; private static readonly object _ cacheLock = new object (); private static Dictionary <string, string> _ cache = new Dictionary <string, string> (); /// <summary> /// maximum number of cached items // /</Summary> private static int _ maxCacheNum = 10000; /// <summary> /// constructor of the symmetric encryption class /// </summary> public static EncryptSugar GetInstance () {if (_ instance = null) {lock (_ instanceLock) {if (_ instance = null) {mobjCryptoService = new RijndaelManaged (); _ key = "Guz (% & as1213 ^ d (fa % (HilJ $ lhj! Y6 & (* jkP87jH7 "; _ instance = new EncryptSugar () ;}} return _ instance ;} /// <summary> /// encryption method /// </summary> /// <param name = "Source"> string to be encrypted </param> /// <returns> encrypted string </returns> public string Encrypto (string source) {if (_ cache. containsKey (source) {return _ cache [source];} byte [] bytIn = UTF8Encoding. UTF8.GetBytes (source); MemoryStream MS = new MemoryStream (); mobjCryptoService. key = GetLegalKey (); mobjCryptoService. IV = GetLegalIV (); ICryptoTransform encrypto = mobjCryptoService. createEncryptor (); CryptoStream cs = new CryptoStream (MS, encrypto, CryptoStreamMode. write); cs. write (bytIn, 0, bytIn. length); cs. flushFinalBlock (); ms. close (); byte [] bytOut = ms. toArray (); string reval = Convert. toBase64String (bytOut); lock (_ cacheLock) {if (_ cache. count> _ maxCacheNum) {foreach (var it in _ cache. take (_ maxCacheNum/5) {_ cache. remove (it. key) ;}}_ cache. add (source, reval);} return reval ;;} /// <summary> /// Decryption Method /// </summary> /// <param name = "Source"> string to be decrypted </param> /// <returns> decrypted string </returns> public string Decrypto (string source) {lock (_ cacheLock) {if (_ cache. any (it => it. value = source) {return _ cache. single (it => it. value = source ). key ;}} byte [] bytIn = Convert. fromBase64String (source); MemoryStream MS = new MemoryStream (bytIn, 0, bytIn. length); mobjCryptoService. key = GetLegalKey (); mobjCryptoService. IV = GetLegalIV (); ICryptoTransform encrypto = mobjCryptoService. createDecryptor (); CryptoStream cs = new CryptoStream (MS, encrypto, CryptoStreamMode. read); StreamReader sr = new StreamReader (cs); return sr. readToEnd () ;}/// <summary> // MD5 encryption, irreversible // </summary> /// <param name = "source"> </param> /// <returns> </returns> public string MD5 (string source) {return System. web. security. formsAuthentication. hashPasswordForStoringInConfigFile (source, "MD5 ");} # region private function // <summary> // obtain the key // </summary> // <returns> key </returns> private byte [] GetLegalKey () {string sTemp = _ key; mobjCryptoService. generateKey (); byte [] bytTemp = mobjCryptoService. key; int KeyLength = bytTemp. length; if (sTemp. length> KeyLength) sTemp = sTemp. substring (0, KeyLength); else if (sTemp. length <KeyLength) sTemp = sTemp. padRight (KeyLength, ''); return ASCIIEncoding. ASCII. getBytes (sTemp );} /// <summary> /// obtain the initial vector IV /// </summary> /// <returns> initial test vector IV </returns> private byte [] GetLegalIV () {string sTemp = "asdfas & dfg * $ # +) * Y41sdgsdgs & * % $ ^ & GGslsadKdfK1"; mobjCryptoService. generateIV (); byte [] bytTemp = mobjCryptoService. IV; int IVLength = bytTemp. length; if (sTemp. length> IVLength) sTemp = sTemp. substring (0, IVLength); else if (sTemp. length <IVLength) sTemp = sTemp. padRight (IVLength, ''); return ASCIIEncoding. ASCII. getBytes (sTemp) ;}# endregion }}