Asp.net 使用三元组对密码进行加密解密

我正在处理登录应用程序，我必须使用TripleDES加密和解密密码，我有一组编码，编码加密工作正常，但解密不起作用，它显示出一个错误

错误为：

The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters. 

编码为：

The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters. 

newuser.aspx.cs

using System;
using System.Web.UI;
using System.Data.SqlClient;
using System.Configuration;
using System.Security.Cryptography;
using System.Text;
using System.IO;

namespace WebApplication5
{
    public partial class WebForm6 : System.Web.UI.Page
    {
        SqlConnection connection;
        protected void Page_Load(object sender, EventArgs e)
        {
            connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            SqlConnection con1 = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
            con1.Open();

            SqlCommand cmd1 = new SqlCommand("select * from admin where USERNAME=@USERNAME and PASSWORD=@PASSWORD ", con1);
            cmd1.Parameters.AddWithValue("@username", txtUserName.Text);
            cmd1.Parameters.AddWithValue("@password", txtPassword.Text);
            SqlDataReader dr = cmd1.ExecuteReader();
            if (dr.HasRows)
            {
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('userName is already availables')</script>");

            }

            else
            {

                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
                con.Open();
                string strQuery = "insert into admin( USERNAME,PASSWORD) values('" + txtUserName.Text +
                "','" + EncryptTripleDES(txtPassword.Text) + "')";
                connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
                connection.Open();
                SqlCommand cmd = new SqlCommand(strQuery, connection);
                cmd.ExecuteNonQuery();
                connection.Close();
                Response.Redirect("login.aspx");

            }

            con1.Close();
        }



        public static string EncryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter streamWriter = new StreamWriter(cryptoStream);
            streamWriter.Write(value);
            streamWriter.Flush();
            cryptoStream.FlushFinalBlock();
            memoryStream.Flush();
            return Convert.ToBase64String(memoryStream.GetBuffer(), 0, Convert.ToInt32(memoryStream.Length));
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using System.Security.Cryptography;
using System.IO;

namespace WebApplication5
{
    public partial class WebForm4 : System.Web.UI.Page
    {
        SqlConnection connection;
        protected void Page_Load(object sender, EventArgs e)
        {
            connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            SqlConnection con1 = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
            con1.Open();
            SqlCommand cmd1 = new SqlCommand("select * from admin where USERNAME=@USERNAME and PASSWORD=@PASSWORD ", con1);
            cmd1.Parameters.AddWithValue("@username", txtUserName.Text);
            cmd1.Parameters.AddWithValue("@password", EncryptTripleDES(DecryptTripleDES(txtPassword.Text)));
            SqlDataAdapter da = new SqlDataAdapter(cmd1);
            DataTable dt = new DataTable();
            da.Fill(dt);
            if (dt.Rows.Count > 0)
            {
                Response.Redirect("emplist.aspx");
            }
            else
            {
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");
            }
            con1.Close();
        }
        protected void btnClear_Click(object sender, EventArgs e)
        {
            txtUserName.Text = "";
            txtPassword.Text = "";
        }



        public static string EncryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter streamWriter = new StreamWriter(cryptoStream);
            streamWriter.Write(value);
            streamWriter.Flush();
            cryptoStream.FlushFinalBlock();
            memoryStream.Flush();
            return Convert.ToBase64String(memoryStream.GetBuffer(), 0, Convert.ToInt32(memoryStream.Length));
        }


        public static string DecryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            byte[] buffer = Convert.FromBase64String(value);
            MemoryStream memoryStream = new MemoryStream(buffer);
            CryptoStream cryptoSteam = new CryptoStream(memoryStream, cryptoProvider.CreateDecryptor(), CryptoStreamMode.Read);
            StreamReader streamReader = new StreamReader(cryptoSteam);
            return streamReader.ReadToEnd();
        }

    }

}

使用系统；
使用System.Web.UI；
使用System.Data.SqlClient；
使用系统配置；
使用System.Security.Cryptography；
使用系统文本；
使用System.IO；
命名空间WebApplication5
{
公共部分类WebForm6:System.Web.UI.Page
{
SqlConnection连接；
受保护的无效页面加载（对象发送方、事件参数e）
{
连接=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
}
受保护的void btnsupmit\u单击（对象发送者，事件参数e）
{
SqlConnection con1=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
con1.Open（）；
SqlCommand cmd1=新SqlCommand（“从管理员中选择*，其中用户名=@USERNAME，密码=@PASSWORD”，con1）；
cmd1.Parameters.AddWithValue（“@username”，txtUserName.Text）；
cmd1.Parameters.AddWithValue（“@password”，txtPassword.Text）；
SqlDataReader dr=cmd1.ExecuteReader（）；
如果（哈斯罗博士）
{
RegisterStartupScript（Page.GetType（），“validation”，“alert（'用户名已可用'）”）；
}
其他的
{
SqlConnection con=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
con.Open（）；
string strQuery=“插入管理员（用户名、密码）值（“”+txtUserName.Text+
“，”+EncryptTripleDES（txtPassword.Text）+“）”；
连接=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
connection.Open（）；
SqlCommand cmd=新的SqlCommand（strQuery，connection）；
cmd.ExecuteNonQuery（）；
connection.Close（）；
重定向（“login.aspx”）；
}
con1.Close（）；
}
公共静态字符串加密三元组（字符串值）
{
TripleDESCryptoServiceProvider cryptoProvider=新的TripleDESCryptoServiceProvider（）；
MemoryStream MemoryStream=新的MemoryStream（）；
CryptoStream CryptoStream=新加密流（memoryStream，cryptoProvider.CreateEncryptor（），CryptoStreamMode.Write）；
StreamWriter StreamWriter=新StreamWriter（加密流）；
streamWriter.Write（值）；
streamWriter.Flush（）；
cryptoStream.FlushFinalBlock（）；
memoryStream.Flush（）；
返回Convert.ToBase64String（memoryStream.GetBuffer（），0，Convert.ToInt32（memoryStream.Length））；
}
}
}

login.aspx.cs

using System;
using System.Web.UI;
using System.Data.SqlClient;
using System.Configuration;
using System.Security.Cryptography;
using System.Text;
using System.IO;

namespace WebApplication5
{
    public partial class WebForm6 : System.Web.UI.Page
    {
        SqlConnection connection;
        protected void Page_Load(object sender, EventArgs e)
        {
            connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            SqlConnection con1 = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
            con1.Open();

            SqlCommand cmd1 = new SqlCommand("select * from admin where USERNAME=@USERNAME and PASSWORD=@PASSWORD ", con1);
            cmd1.Parameters.AddWithValue("@username", txtUserName.Text);
            cmd1.Parameters.AddWithValue("@password", txtPassword.Text);
            SqlDataReader dr = cmd1.ExecuteReader();
            if (dr.HasRows)
            {
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('userName is already availables')</script>");

            }

            else
            {

                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
                con.Open();
                string strQuery = "insert into admin( USERNAME,PASSWORD) values('" + txtUserName.Text +
                "','" + EncryptTripleDES(txtPassword.Text) + "')";
                connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
                connection.Open();
                SqlCommand cmd = new SqlCommand(strQuery, connection);
                cmd.ExecuteNonQuery();
                connection.Close();
                Response.Redirect("login.aspx");

            }

            con1.Close();
        }



        public static string EncryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter streamWriter = new StreamWriter(cryptoStream);
            streamWriter.Write(value);
            streamWriter.Flush();
            cryptoStream.FlushFinalBlock();
            memoryStream.Flush();
            return Convert.ToBase64String(memoryStream.GetBuffer(), 0, Convert.ToInt32(memoryStream.Length));
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using System.Security.Cryptography;
using System.IO;

namespace WebApplication5
{
    public partial class WebForm4 : System.Web.UI.Page
    {
        SqlConnection connection;
        protected void Page_Load(object sender, EventArgs e)
        {
            connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            SqlConnection con1 = new SqlConnection(ConfigurationManager.ConnectionStrings["TestQueryConnectionString"].ConnectionString);
            con1.Open();
            SqlCommand cmd1 = new SqlCommand("select * from admin where USERNAME=@USERNAME and PASSWORD=@PASSWORD ", con1);
            cmd1.Parameters.AddWithValue("@username", txtUserName.Text);
            cmd1.Parameters.AddWithValue("@password", EncryptTripleDES(DecryptTripleDES(txtPassword.Text)));
            SqlDataAdapter da = new SqlDataAdapter(cmd1);
            DataTable dt = new DataTable();
            da.Fill(dt);
            if (dt.Rows.Count > 0)
            {
                Response.Redirect("emplist.aspx");
            }
            else
            {
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");
            }
            con1.Close();
        }
        protected void btnClear_Click(object sender, EventArgs e)
        {
            txtUserName.Text = "";
            txtPassword.Text = "";
        }



        public static string EncryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(), CryptoStreamMode.Write);
            StreamWriter streamWriter = new StreamWriter(cryptoStream);
            streamWriter.Write(value);
            streamWriter.Flush();
            cryptoStream.FlushFinalBlock();
            memoryStream.Flush();
            return Convert.ToBase64String(memoryStream.GetBuffer(), 0, Convert.ToInt32(memoryStream.Length));
        }


        public static string DecryptTripleDES(string value)
        {
            TripleDESCryptoServiceProvider cryptoProvider = new TripleDESCryptoServiceProvider();
            byte[] buffer = Convert.FromBase64String(value);
            MemoryStream memoryStream = new MemoryStream(buffer);
            CryptoStream cryptoSteam = new CryptoStream(memoryStream, cryptoProvider.CreateDecryptor(), CryptoStreamMode.Read);
            StreamReader streamReader = new StreamReader(cryptoSteam);
            return streamReader.ReadToEnd();
        }

    }

}

使用系统；
使用System.Collections.Generic；
使用System.Linq；
使用System.Web；
使用System.Web.UI；
使用System.Web.UI.WebControl；
使用System.Data.SqlClient；
使用系统配置；
使用系统数据；
使用System.Security.Cryptography；
使用System.IO；
命名空间WebApplication5
{
公共部分类WebForm4:System.Web.UI.Page
{
SqlConnection连接；
受保护的无效页面加载（对象发送方、事件参数e）
{
连接=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
}
受保护的void btnsupmit\u单击（对象发送者，事件参数e）
{
SqlConnection con1=新的SqlConnection（ConfigurationManager.ConnectionString[“TestQueryConnectionString”].ConnectionString）；
con1.Open（）；
SqlCommand cmd1=新SqlCommand（“从管理员中选择*，其中用户名=@USERNAME，密码=@PASSWORD”，con1）；
cmd1.Parameters.AddWithValue（“@username”，txtUserName.Text）；
cmd1.Parameters.AddWithValue（@password），EncryptTripleDES（DecryptTripleDES（txtPassword.Text））；
SqlDataAdapter da=新的SqlDataAdapter（cmd1）；
DataTable dt=新的DataTable（）；
da.填充（dt）；
如果（dt.Rows.Count>0）
{
重定向（“emplist.aspx”）；
}
其他的
{
RegisterStartupScript（Page.GetType（），“验证”，“警报（'无效用户名和密码'））；
}
con1.Close（）；
}
受保护的无效btnClear\u单击（对象发送方，事件参数e）
{
txtUserName.Text=“”；
txtPassword.Text=“”；
}
公共静态字符串加密三元组（字符串值）
{
TripleDESCryptoServiceProvider cryptoProvider=新的TripleDESCryptoServiceProvider（）；
MemoryStream MemoryStream=新的MemoryStream（）；
CryptoStream CryptoStream=新加密流（memoryStream，cryptoProvider.CreateEncryptor（），CryptoStreamMode.Write）；
StreamWriter StreamWriter=新StreamWriter（加密流）；
streamWriter.Write（值）；
streamWriter.Flush（）；
cryptoStream.FlushFinalBlock（）；
memoryStream.Flush（）；
返回Convert.ToBase64String（memoryStream.GetBuffer（），0，Convert.ToInt32（memoryStream.Length））；
}
公共静态字符串解密三元组（字符串值）
{
TripleDESCryptoServiceProvider cryptoProvider=新的TripleDESCryptoServiceProvider（）；
字节[]缓冲区=Convert.FromBase64String（值）；
MemoryStream MemoryStream=新的MemoryStream（缓冲区）；
CryptoStream cryptoSteam=新加密流（内存