C#加密解密总结.doc

3、 System.Security.Cryptography; ... public string Encode(string data){    byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);    byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);     DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();    int

4、 i = cryptoProvider.KeySize;    MemoryStream ms = new MemoryStream();    CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);     StreamWriter sw = new StreamWriter(cst);    sw.Write(data);    sw.Flush();    cst.FlushFinalBlock(); 

5、   sw.Flush();    return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); } public string Decode(string data){    byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);    byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);     byte[] byEnc;    try    {    

6、    byEnc = Convert.FromBase64String(data);    }    catch    {        return null;    }     DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();    MemoryStream ms = new MemoryStream(byEnc);    CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(by

7、Key, byIV), CryptoStreamMode.Read);    StreamReader sr = new StreamReader(cst);    return sr.ReadToEnd();}方法三(MD5不可逆)：using System.Security.Cryptography; ... //MD5不可逆加密 //32位加密 public string GetMD5_32(string s, string _input_charset){    MD5 md5 = new MD5CryptoServiceProv