基于.net的加密汇总（2）

引用C#密码加密

EncryptPassWord类:

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Security.Cryptography; using System.Text;
publicclass EncryptPassWord {     ///<summary>     /// 获取密钥     ///</summary>     ///<returns></returns>    publicstaticstring CreateSalt()     {         byte[] data =newbyte[8];         new RNGCryptoServiceProvider().GetBytes(data);         return Convert.ToBase64String(data);     }
    ///<summary>     /// 加密密码     ///</summary>     ///<param name="pwdString"></param>     ///<param name="salt"></param>     ///<returns></returns>    publicstaticstring EncryptPwd(string pwdString, string salt)     {         if (salt ==null|| salt =="")         {             return pwdString;         }         byte[] bytes = Encoding.Unicode.GetBytes(salt.ToLower().Trim() + pwdString.Trim());         return BitConverter.ToString(((HashAlgorithm)CryptoConfig.CreateFromName("SHA1")).ComputeHash(bytes));     } } 

DESEncrypt类:

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Security.Cryptography; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; using System.Text; ///<summary>/// Summary description for DESEncrypt ///</summary>publicclass DESEncrypt {     privatestring iv ="12345678";     privatestring key ="12345678";     private Encoding encoding =new UnicodeEncoding();     private DES des;
    public DESEncrypt()     {         des =new DESCryptoServiceProvider();     }
    ///<summary>     /// 设置加密密钥     ///</summary>    publicstring EncryptKey     {         get { returnthis.key; }         set         {             this.key = value;         }             }
    ///<summary>     /// 要加密字符的编码模式     ///</summary>    public Encoding EncodingMode     {         get { returnthis.encoding; }         set { this.encoding = value; }     }
    ///<summary>     /// 加密字符串并返回加密后的结果     ///</summary>     ///<param name="str"></param>     ///<returns></returns>    publicstring EncryptString(string str)     {         byte[] ivb = Encoding.ASCII.GetBytes(this.iv);         byte[] keyb = Encoding.ASCII.GetBytes(this.EncryptKey);//得到加密密钥        byte[] toEncrypt =this.EncodingMode.GetBytes(str);//得到要加密的内容        byte[] encrypted;         ICryptoTransform encryptor = des.CreateEncryptor(keyb, ivb);         MemoryStream msEncrypt =new MemoryStream();         CryptoStream csEncrypt =new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);         csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);         csEncrypt.FlushFinalBlock();         encrypted = msEncrypt.ToArray();         csEncrypt.Close();         msEncrypt.Close();         returnthis.EncodingMode.GetString(encrypted);     } } 

1.原理:每次产生一个随机字符串作为密匙,用户输入一个密码,密码经过密匙加密得到一个字符串存放在数据库中...当需要验证密码时,要先得到密匙才能验证.

  (1).登录时,验证代码

//根据用户名得到用户信息        DataTable dt = WYTWeb.UserDAO.UserLogin(userName);  if (dt.Rows.Count ==0)  {     return-2;//用户不存在 }
 DataRow row = dt.Rows[0];  //得到密匙string salt = row["salt"].ToString();  //验证密码是否正确if (EncryptPassWord.EncryptPwd(password, salt) == row["password"].ToString())  {       //登录成功 }

(2)修改密码时(与插入一条新密码一样)

//从基类获得登录idint userId = LoginUser_Id; //获得密匙string salt = EncryptPassWord.CreateSalt(); //得到经过加密后的"密码"string password = EncryptPassWord.EncryptPwd(txtPassword.Text.Trim(), salt); //修改原数据int result = WYTWeb.UserDAO.EditPassword(userId, password, salt); if (result >0) {      WYTWeb.LogDAO.InsertLog("info","wytWeb","用户"+userId+"修改了密码", userId ,this.Request.UserHostAddress.ToString());      ShowMessage("密码修改成功");            //this.Response.Redirect("CompanyInfo.aspx"); } else {     WYTWeb.LogDAO.InsertLog("info", "wytWeb", "用户"+ userId +"修改密码失败", userId, this.Request.UserHostAddress.ToString());     ShowMessage("密码修改失败"); }