5.encryptHelper类

Posted 2020-11-09 feihusurfer

//把一个字符串转换成对应的MD5
public static string toMD5(string str)
{
　　return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "md5").ToLower();
}

public static string _KEY = "wzr17021"; //密钥
public static string _IV = "wzr17022"; //向量

/// <summary>
/// 加密
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string DES加密(string data)
{
　　byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY);
　　byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV);

　　DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
　　int 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();
　　sw.Flush();

　　string strRet = Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
　　return strRet;
}

/// <summary>
/// 解密
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string DES解密(string data)
{

　　byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(_KEY);
　　byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(_IV);

　　byte[] byEnc;

　　try
　　{
　　　　data.Replace("_%_", "/");
　　　　data.Replace("-%-", "#");
　　　　byEnc = Convert.FromBase64String(data);

　　}
　　catch
　　{
　　　　return null;
　　}

　　DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
　　MemoryStream ms = new MemoryStream(byEnc);
　　CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
　　StreamReader sr = new StreamReader(cst);
　　return sr.ReadToEnd();
}