c加密解密算法

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1、1、方法一(不可逆)publicstringEncryptPassword(stringPasswordString,stringPasswordFormat){stringencryptPassword=null;if(PasswordFormat="SHA1"){encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString,"SHA1");}elseif(PasswordFormat="MD5"){encryptPassword

2、=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString,"MD5");}returnencryptPassword;}2、方法二(可逆)publicinterfaceIBindesh{stringencode(stringstr);stringdecode(stringstr);}publicclassEncryptionDecryption:IBindesh{publicstringencode(stringstr){stringhtext="";for

3、(inti=0;i

5、oryStream();CryptoStreamcst=newCryptoStream(ms,cryptoProvider.CreateEncryptor(byKey,byIV),CryptoStreamMode.Write);StreamWritersw=newStreamWriter(cst);sw.Write(data);sw.Flush();cst.FlushFinalBlock();sw.Flush();returnConvert.ToBase64String(ms.GetBuffer(),0,(int)ms.Length);}p

6、ublicstringDecode(stringdata){byte[]byKey=System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);byte[]byIV=System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);byte[]byEnc;try{byEnc=Convert.FromBase64String(data);}catch{returnnull;}DESCryptoServiceProvidercryptoProvider=newDESCrypto

7、ServiceProvider();MemoryStreamms=newMemoryStream(byEnc);CryptoStreamcst=newCryptoStream(ms,cryptoProvider.CreateDecryptor(byKey,byIV),CryptoStreamMode.Read);StreamReadersr=newStreamReader(cst);returnsr.ReadToEnd();}4、MD5不可逆加密(32位加密)publicstringGetMD5(strings,string_input_c

8、harset){/**//**//**////