ＶＳＣ＃。ＮＥＴ 2005
这是我对于加密方面的一个练习，之所以把加密后数据存为数字形式，是因为我发现存为Unicode或者其它格式时，从txtbox里再读入时都会使信息发生变化，有人可以告诉我这该怎么处理吗？
谢谢～
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;
using System.Diagnostics;
namespace TripleDES
{
public partial class TdesEncryptExample : Form
{
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(TdesEncryptExample));
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.txtKey = new System.Windows.Forms.TextBox();
this.btnEncrypt = new System.Windows.Forms.Button();
this.btnDecrypt = new System.Windows.Forms.Button();
this.txtDecrypt = new System.Windows.Forms.RichTextBox();
this.txtEncrypt = new System.Windows.Forms.RichTextBox();
this.linkLabel1 = new System.Windows.Forms.LinkLabel();
this.label4 = new System.Windows.Forms.Label();
this.label5 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(22, 15);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(65, 12);
this.label1.TabIndex = 0;
this.label1.Text = "原始字符串";
//
// label2
//
this.label2.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(22, 331);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(29, 12);
this.label2.TabIndex = 0;
this.label2.Text = "密码";
//
// label3
//
this.label3.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(22, 158);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(89, 12);
this.label3.TabIndex = 0;
this.label3.Text = "加密后的字符串";
//
// txtKey
//
this.txtKey.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtKey.ImeMode = System.Windows.Forms.ImeMode.On;
this.txtKey.Location = new System.Drawing.Point(73, 328);
this.txtKey.Name = "txtKey";
this.txtKey.Size = new System.Drawing.Size(285, 21);
this.txtKey.TabIndex = 2;
this.txtKey.UseSystemPasswordChar = true;
//
// btnEncrypt
//
this.btnEncrypt.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.btnEncrypt.Location = new System.Drawing.Point(199, 368);
this.btnEncrypt.Name = "btnEncrypt";
this.btnEncrypt.Size = new System.Drawing.Size(75, 23);
this.btnEncrypt.TabIndex = 3;
this.btnEncrypt.Text = "加密";
this.btnEncrypt.UseVisualStyleBackColor = true;
this.btnEncrypt.Click += new System.EventHandler(this.btnEncrypt_Click);
//
// btnDecrypt
//
this.btnDecrypt.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.btnDecrypt.Location = new System.Drawing.Point(303, 368);
this.btnDecrypt.Name = "btnDecrypt";
this.btnDecrypt.Size = new System.Drawing.Size(75, 23);
this.btnDecrypt.TabIndex = 4;
this.btnDecrypt.Text = "解密";
this.btnDecrypt.UseVisualStyleBackColor = true;
this.btnDecrypt.Click += new System.EventHandler(this.btnDecrypt_Click);
//
// txtDecrypt
//
this.txtDecrypt.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtDecrypt.Location = new System.Drawing.Point(24, 39);
this.txtDecrypt.Name = "txtDecrypt";
this.txtDecrypt.Size = new System.Drawing.Size(476, 106);
this.txtDecrypt.TabIndex = 0;
this.txtDecrypt.Text = "";
//
// txtEncrypt
//
this.txtEncrypt.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.txtEncrypt.Location = new System.Drawing.Point(24, 185);
this.txtEncrypt.Name = "txtEncrypt";
this.txtEncrypt.Size = new System.Drawing.Size(476, 125);
this.txtEncrypt.TabIndex = 1;
this.txtEncrypt.Text = "";
//
// linkLabel1
//
this.linkLabel1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.linkLabel1.AutoSize = true;
this.linkLabel1.Location = new System.Drawing.Point(435, 395);
this.linkLabel1.Name = "linkLabel1";
this.linkLabel1.Size = new System.Drawing.Size(41, 12);
this.linkLabel1.TabIndex = 5;
this.linkLabel1.TabStop = true;
this.linkLabel1.Text = "夏阳港";
this.linkLabel1.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);
//
// label4
//
this.label4.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(412, 395);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(17, 12);
this.label4.TabIndex = 6;
this.label4.Text = "by";
//
// label5
//
this.label5.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(367, 335);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(125, 12);
this.label5.TabIndex = 7;
this.label5.Text = "(密码长度为6到24位）";
//
// TdesEncryptExample
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(524, 421);
this.Controls.Add(this.label5);
this.Controls.Add(this.label4);
this.Controls.Add(this.linkLabel1);
this.Controls.Add(this.txtEncrypt);
this.Controls.Add(this.txtDecrypt);
this.Controls.Add(this.btnDecrypt);
this.Controls.Add(this.btnEncrypt);
this.Controls.Add(this.txtKey);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.Name = "TdesEncryptExample";
this.Text = "tdes对称加密";
this.Load += new System.EventHandler(this.TdesEncryptExample_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox txtKey;
private System.Windows.Forms.Button btnEncrypt;
private System.Windows.Forms.Button btnDecrypt;
private System.Windows.Forms.RichTextBox txtDecrypt;
private System.Windows.Forms.RichTextBox txtEncrypt;
private System.Windows.Forms.LinkLabel linkLabel1;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label label5;
public TdesEncryptExample()
{
InitializeComponent();
key = new byte[24];
IV = new byte[8];
}
#region 参数声明
private byte[] key;
private byte[] IV;
#endregion
private void TdesEncryptExample_Load(object sender, EventArgs e)
{
key = new byte[24];
IV = new byte[8];
}
private byte[] EncryptText(string str, byte[] Key, byte[] IV)
{
try
{
//创建一个内存流。
MemoryStream memoryStream = new MemoryStream();
//使用传递的私钥和IV创建加密流。
CryptoStream cryptoStream = new CryptoStream(memoryStream,
new TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
//将传递的字符串转换为字节数组。
byte[] toEncrypt = Encoding.Unicode.GetBytes(str);
try
{
//将字节数组写入加密流，并清除缓冲区
cryptoStream.Write(toEncrypt, 0, toEncrypt.Length);
cryptoStream.FlushFinalBlock();
//得到加密后的字节数组。
byte[] encryptedBytes = memoryStream.ToArray();
return encryptedBytes;
}
catch (CryptographicException err)
{
throw new Exception("加密出错：" + err.Message);
}
finally
{
cryptoStream.Close();
memoryStream.Close();
}
}
catch (Exception err)
{
MessageBox.Show(err.Message);
return null;
}
}
private string DecryptText(byte[] dataBytes, byte[] Key, byte[] IV)
{
//根据加密后的字节数组创建一个内存流。
MemoryStream memoryStream = new MemoryStream(dataBytes);
//使用传递的私钥、IV和内存流创建解密流。
CryptoStream cryptoStream = new CryptoStream(memoryStream,
new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV),
CryptoStreamMode.Read);
//创建一个字节数组保存解密后的数据。
byte[] decryptedBytes = new byte[dataBytes.Length];
try
{
//从解密流中将解密后的数据读到字节数组中。
cryptoStream.Read(decryptedBytes, 0, decryptedBytes.Length);
//得到解密后的字符串。
string decryptedString = Encoding.Unicode.GetString(decryptedBytes);
return decryptedString;
}
catch (CryptographicException err)
{
throw new Exception("解密出错:" + err.Message);
}
finally
{
cryptoStream.Close();
memoryStream.Close();
}
}
private void SetKeyAndIV(string str)
{
byte[] temp = Encoding.UTF8.GetBytes(str);
int len = temp.Length;
for (int i = 0; i < len; i++)
{
key[23 - i] = temp[i];
}
//填满其余值。
for (int i = len; i < 24; i++)
{
key[23 - i] = (byte)i;
}
IV = new byte[8];
for (int i = 0; i < 8; i++)
{
IV[i] = key[i * 3];
}
}
private void btnEncrypt_Click(object sender, EventArgs e)
{
if (txtDecrypt.Text == "")
{
MessageBox.Show("加密文档为空！", "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
int len = txtKey.Text.Length;
if (len > 24)
{
MessageBox.Show("密码长度不能大于24个字符！", "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
if (len < 6)
{
MessageBox.Show("密码长度不能小于6个字符！");
return;
}
//初始化key和iv
SetKeyAndIV(txtKey.Text);
byte[]encryptedBytes=EncryptText(txtDecrypt.Text, key, IV);
if (encryptedBytes != null)
{
string str = BytesToString(encryptedBytes);
txtEncrypt.Text=str;
}
}
private void btnDecrypt_Click(object sender, EventArgs e)
{
if (txtEncrypt.Text == "")
{
MessageBox.Show("解密数据为空！", "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
int len = txtKey.Text.Length;
if (len > 24 || len < 6)
{
MessageBox.Show("对不起，您的密码输入错误！","提示",
MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
return;
}
SetKeyAndIV(txtKey.Text);
try
{
//解密。
byte[] encryptedBytes = StringToBytes(txtEncrypt.Text);
string decryptString = DecryptText(encryptedBytes, key, IV);
txtDecrypt.Text = decryptString;
}
catch (Exception err)
{
MessageBox.Show("解密出现错误，可能是您的密码或者加密数据有误。", "提示",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
private string BytesToString(byte[]dataBytes)
{
int len = dataBytes.Length;
string str=len.ToString();
for (int i = 0; i < len; i++)
{
str += "-" + ((int)dataBytes[i]);
}
return str;
}
private byte[] StringToBytes(string dataString)
{
int i,i1, i2;
i1 = dataString.IndexOf('-');
int len = int.Parse(dataString.Substring(0,i1));
byte[] by = new byte[len];
i2 = i1;
for(i=0;i<len-1;i++)
{
i1 = i2;
i2 = dataString.IndexOf('-', i1+1);
by[i]=(byte)(int.Parse(dataString.Substring(i1+1,i2-i1-1)));
}
by[i]=(byte)(int.Parse(dataString.Substring(i2+1)));
return by;
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
Process.Start("mailto:hejw06@tsinghua.edu.cn");
}
}
}