续md5加密解密

续md5加密解密，是md5加密的延伸

 

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 2010-7-16
 * Time: 16:54
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.Text;
using System.Data.OleDb;
using System.Data;

namespace md5
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public partial class MainForm
    {
        [STAThread]
        public static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainForm());
        }
        
        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
        }
        
        void Button1Click(object sender, System.EventArgs e)
        {
            int sca;
            
            byte[] result=Encoding.Default.GetBytes(this.txtinp.Text.Trim());
            MD5  md5=new MD5CryptoServiceProvider();
            byte[] outp=md5.ComputeHash(result);
            this.txtout.Text=BitConverter.ToString(outp).Replace("-","");
            sca=ExecuteScalarsql("select count(*) from t_jm where txttitle='"+this.txtinp.Text.ToString()+"'");
            if (sca==0)
            {
                executesql("insert into t_jm(txttitle,txtpassword)values('"+this.txtinp.Text.ToString()+"','"+BitConverter.ToString(outp).Replace("-","")+"')");
            }
        }
        
        void Button2Click(object sender, System.EventArgs e)
        {
            try{
                if(this.txtinp.Text=="")
                {
                    MessageBox.Show("请输入解密代码","友情提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    this.txtinp.Focus();
                    return ;
                }
            string m_str_connstr;
            string m_str_jm;
            string m_str_path;
            m_str_path=Application.StartupPath+"/data/md5_db.mdb";
            m_str_connstr="Provider=Microsoft.Jet.OLEDB.4.0;data source="+m_str_path+"";
            OleDbConnection conn=new OleDbConnection();
            conn.ConnectionString=m_str_connstr;
            conn.Open();
            m_str_jm=this.txtinp.Text.ToString();
            OleDbCommand cmd=new OleDbCommand("select * from t_jm where txtpassword='"+m_str_jm+"'",conn);
            OleDbDataReader rs=cmd.ExecuteReader();
            if(rs.HasRows)
            {
                rs.Read();
                this.txtout.Text=rs["txttitle"].ToString();
                rs.Close();
            }
            else
            {
                    rs.Close();
                cmd.CommandText="insert into t_jm(txtpassword) values('"+m_str_jm+"')";
                cmd.ExecuteNonQuery();
                this.txtout.Text="对不起，没有找到信息";
            }
            rs.Close();
            conn.Close();
            conn.Dispose();
            }
            catch(Exception ee)
                {
                MessageBox.Show(ee.ToString());
                }
        }
#region 是否存在查询信息
public int ExecuteScalarsql(string m_str_sql)
{
    string m_str_path,m_str_connstr;
    int counts;
    m_str_path=Application.StartupPath+"/data/md5_db.mdb";
    OleDbConnection conn=new OleDbConnection();
    m_str_connstr="Provider=Microsoft.Jet.OLEDB.4.0;data source="+m_str_path+"";
    conn.ConnectionString=m_str_connstr;
    conn.Open();
    OleDbCommand cmd=new OleDbCommand(m_str_sql,conn);
    counts=(int)cmd.ExecuteScalar();
    if(counts>0)
    {
        return 1;//有信息反回1
    }
    else
        
    {
        return 0;//没有信息反回0
    }
}
#endregion

#region 执行语句
public void executesql(string m_str_sql)
{
string m_str_path,m_str_connstr;
m_str_path=Application.StartupPath+"/data/md5_db.mdb";
    OleDbConnection conn=new OleDbConnection();
    m_str_connstr="Provider=Microsoft.Jet.OLEDB.4.0;data source="+m_str_path+"";
    conn.ConnectionString=m_str_connstr;
    conn.Open();
    OleDbCommand cmd=new OleDbCommand(m_str_sql,conn);
    cmd.ExecuteNonQuery();
    conn.Close();
    conn.Dispose();
}
#endregion
    }
}

 

 

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