使用对称加密与解密算法对文件加密与解密

 看了张子阳的博客，自己也看了一些资料，于是动手写了一个对文件加密与机密的小玩意，贴出来供大家参考，呵呵，可能对于高手来说，这个东西显的十分粗糙，希望大侠能够指点一二。

首先是程序的运行界面。

在该程序中自己写了一个类CryptoHelper，用来实现对文件的加密与解密操作。下面是这个类的源代码。

1. using System;
2. using System.Collections.Generic;
3. using System.Text;
4. using System.Security.Cryptography;
5. using System.IO;
6. namespace PassWord
7. {
8.     class CryptoHelper
9.     {
10.         private SymmetricAlgorithm provider;
11.         private ICryptoTransform encryptor;
12.         private ICryptoTransform decryptor;
13.         private const int per_length = 100;
14.         /// <summary>
15.         /// 返回每个加密方法的KEY的长度
16.         /// </summary>
17.         /// <param name="algrorithmName">算法名</param>
18.         /// <returns>整型数组</returns>
19.         /// 如果数组的第四个数据是0，那么
20.         /// 数组的第一个数据是KEY的最少位
21.         /// 数组的第二个数据是KEY的最大位，如果为0，说说明只支持一种位数
22.         /// 数组的第三个数据是KEY的跳跃值
23.         /// 如果数组的第四个数据是-1
24.         /// 数组的第一个数据是KEY可以支持的第一种位数
25.         /// 数组的第二个数据是KEY可以支持的第二种位数
26.         /// 数组的第三个数据是KEY可以支持的第三种位数
27.         public static int [] GetKeyLength(string algrorithmName)
28.         {
29.             int[] Int_Key = new int[4] { 0,0,0,0};           
30.             switch (algrorithmName)
31.             {
32.                 case "DES":
33.                     {
34.                         Int_Key[0] = 64;
35.                         Int_Key[1] = 0;
36.                         Int_Key[2] = 0;
37.                         Int_Key[3] = 0;
38.                         return Int_Key;
39.                     }                   
40.                 case "RC2":
41.                     {
42.                         Int_Key[0] = 40;
43.                         Int_Key[1] = 128;
44.                         Int_Key[2] = 8;
45.                         Int_Key[3] = 0;
46.                         return Int_Key;
47.                     } 
48.                 case "Rijndael":
49.                     {
50.                         Int_Key[0] = 128;
51.                         Int_Key[1] = 192;
52.                         Int_Key[2] = 256;
53.                         Int_Key[3] = -1;
54.                         return Int_Key;
55.                     } 
56.                 case "TripleDES":
57.                     {
58.                         Int_Key[0] = 128;
59.                         Int_Key[1] = 192;
60.                         Int_Key[2] = 64;
61.                         Int_Key[3] = 0;
62.                         return Int_Key;
63.                     } 
64.             }
65.             return Int_Key;
66.         }
67.         /// <summary>
68.         /// 构造函数，用来生成具体的加密与解密的对象
69.         /// </summary>
70.         /// <param name="algrorithmName">加密或者解密的算法名称</param>
71.         /// <param name="Key">加密或解密的密钥</param>
72.         /// <param name="IV">加密或者解密的初始化向量</param>
73.         public CryptoHelper(string algrorithmName, string Key, string IV)
74.         {
75.             provider = SymmetricAlgorithm.Create(algrorithmName);
76.             provider.Key = Encoding.UTF8.GetBytes(Key);
77.             provider.IV = Encoding.UTF8.GetBytes(IV);
78.             encryptor = provider.CreateEncryptor();
79.             decryptor = provider.CreateDecryptor();
80.         }
81.         ~CryptoHelper()
82.         {
83.             provider.Clear();
84.         }
85.         /// <summary>
86.         /// 加密文件的方法
87.         /// </summary>
88.         /// <param name="inName">源文件名</param>
89.         /// <param name="outName">目的文件名</param>
90.         public void EncryptFile(String inName, String outName)
91.         {
92.             //建立文件流用来处理源文件与目的文件
93.             FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
94.             FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
95.             fout.SetLength(0);
97.             //建立变量用来处理文件的读写
98.             byte[] bin = new byte[per_length]; //加密的长度
99.             long rdlen = 0;              //读取数据的总长度
100.             long totlen = fin.Length;    //输入文件的总长度
101.             int len;                    //每次读写数据的长度
102.             
103.             CryptoStream encStream = new CryptoStream(fout,encryptor, CryptoStreamMode.Write);           
105.             //开始加密的过程
106.             while (rdlen < totlen)
107.             {
108.                 len = fin.Read(bin, 0, per_length);
109.                 encStream.Write(bin, 0, len);
110.                 rdlen = rdlen + len;               
111.             }
112.             encStream.Flush();
113.             encStream.Close();
114.             fout.Close();
115.             fin.Close();         
116.         }
117.         /// <summary>
118.         /// 解密文件的算法
119.         /// </summary>
120.         /// <param name="inName">源文件名</param>
121.         /// <param name="outName">目标文件名</param>
122.         public void DecryptFile(String inName, String outName)
123.         {
124.             //建立文件流用来处理源文件与目的文件,源文件是加密后的文件
125.             FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
126.             FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
127.             fout.SetLength(0);
129.             //建立变量用来处理文件的读写
130.             byte[] bin = new byte[per_length]; //加密的长度
131.             long rdlen = 0;              //读取数据的总长度
132.             long totlen = fin.Length;    //输入文件的总长度
133.             int len;                    //每次读写数据的长度
135.             CryptoStream decStream = new CryptoStream(fout,decryptor, CryptoStreamMode.Write);
137.             //开始解密的过程
138.             while (rdlen < totlen)
139.             {
140.                 len = fin.Read(bin, 0, per_length);
141.                 decStream.Write(bin, 0, len);
142.                 rdlen = rdlen + len;
143.             }
144.             decStream.Flush();
145.             decStream.Close();            
146.             fout.Close();
147.             fin.Close();         
148.         }
151.     }
152. }

下面是界面的设计

 

下面是界面的一些设置的代码，这些代码由系统自己生成

1. namespace PassWord
2. {
3.     partial class MainForm
4.     {
5.         /// <summary>
6.         /// 必需的设计器变量。
7.         /// </summary>
8.         private System.ComponentModel.IContainer components = null;
10.         /// <summary>
11.         /// 清理所有正在使用的资源。
12.         /// </summary>
13.         /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
14.         protected override void Dispose(bool disposing)
15.         {
16.             if (disposing && (components != null))
17.             {
18.                 components.Dispose();
19.             }
20.             base.Dispose(disposing);
21.         }
23.         #region Windows 窗体设计器生成的代码
25.         /// <summary>
26.         /// 设计器支持所需的方法 - 不要
27.         /// 使用代码编辑器修改此方法的内容。
28.         /// </summary>
29.         private void InitializeComponent()
30.         {
31.             this.components = new System.ComponentModel.Container();
32.             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
33.             this.pass_cb_style = new System.Windows.Forms.ComboBox();
34.             this.label1 = new System.Windows.Forms.Label();
35.             this.pass_tb_first = new System.Windows.Forms.TextBox();
36.             this.pass_tb_second = new System.Windows.Forms.TextBox();
37.             this.label2 = new System.Windows.Forms.Label();
38.             this.label3 = new System.Windows.Forms.Label();
39.             this.pass_but_encrty = new System.Windows.Forms.Button();
40.             this.pass_but_decrty = new System.Windows.Forms.Button();
41.             this.del_file_checkBox = new System.Windows.Forms.CheckBox();
42.             this.label4 = new System.Windows.Forms.Label();
43.             this.timer1 = new System.Windows.Forms.Timer(this.components);
44.             this.label5 = new System.Windows.Forms.Label();
45.             this.SuspendLayout();
46.             // 
47.             // pass_cb_style
48.             // 
49.             this.pass_cb_style.BackColor = System.Drawing.SystemColors.InactiveCaptionText;
50.             this.pass_cb_style.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
51.             this.pass_cb_style.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
52.             this.pass_cb_style.FormattingEnabled = true;
53.             this.pass_cb_style.Items.AddRange(new object[] {
54.             "DES",
55.             "RC2",
56.             "Rijndael",
57.             "TripleDES"});
58.             this.pass_cb_style.Location = new System.Drawing.Point(174, 16);
59.             this.pass_cb_style.Name = "pass_cb_style";
60.             this.pass_cb_style.Size = new System.Drawing.Size(167, 30);
61.             this.pass_cb_style.TabIndex = 0;
62.             this.pass_cb_style.SelectedIndexChanged += new System.EventHandler(this.pass_cb_style_SelectedIndexChanged);
63.             // 
64.             // label1
65.             // 
66.             this.label1.AutoSize = true;
67.             this.label1.BackColor = System.Drawing.Color.Transparent;
68.             this.label1.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
69.             this.label1.Location = new System.Drawing.Point(18, 20);
70.             this.label1.Name = "label1";
71.             this.label1.Size = new System.Drawing.Size(149, 20);
72.             this.label1.TabIndex = 1;
73.             this.label1.Text = "选择加密的算法";
74.             // 
75.             // pass_tb_first
76.             // 
77.             this.pass_tb_first.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
78.             this.pass_tb_first.Location = new System.Drawing.Point(174, 71);
79.             this.pass_tb_first.Name = "pass_tb_first";
80.             this.pass_tb_first.PasswordChar = '*';
81.             this.pass_tb_first.Size = new System.Drawing.Size(167, 30);
82.             this.pass_tb_first.TabIndex = 2;
83.             this.pass_tb_first.Leave += new System.EventHandler(this.pass_tb_first_Leave);
84.             this.pass_tb_first.KeyUp += new System.Windows.Forms.KeyEventHandler(this.pass_tb_first_KeyUp);
85.             this.pass_tb_first.Enter += new System.EventHandler(this.pass_tb_first_Enter);
86.             // 
87.             // pass_tb_second
88.             // 
89.             this.pass_tb_second.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
90.             this.pass_tb_second.Location = new System.Drawing.Point(176, 164);
91.             this.pass_tb_second.Name = "pass_tb_second";
92.             this.pass_tb_second.PasswordChar = '*';
93.             this.pass_tb_second.Size = new System.Drawing.Size(165, 30);
94.             this.pass_tb_second.TabIndex = 3;
95.             this.pass_tb_second.Leave += new System.EventHandler(this.pass_tb_second_Leave);
96.             this.pass_tb_second.KeyUp += new System.Windows.Forms.KeyEventHandler(this.pass_tb_second_KeyUp);
97.             // 
98.             // label2
99.             // 
100.             this.label2.AutoSize = true;
101.             this.label2.BackColor = System.Drawing.Color.Transparent;
102.             this.label2.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
103.             this.label2.Location = new System.Drawing.Point(18, 76);
104.             this.label2.Name = "label2";
105.             this.label2.Size = new System.Drawing.Size(129, 20);
106.             this.label2.TabIndex = 4;
107.             this.label2.Text = "初次输入密码";
108.             // 
109.             // label3
110.             // 
111.             this.label3.AutoSize = true;
112.             this.label3.BackColor = System.Drawing.Color.Transparent;
113.             this.label3.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
114.             this.label3.Location = new System.Drawing.Point(18, 169);
115.             this.label3.Name = "label3";
116.             this.label3.Size = new System.Drawing.Size(129, 20);
117.             this.label3.TabIndex = 5;
118.             this.label3.Text = "再次输入密码";
119.             // 
120.             // pass_but_encrty
121.             // 
122.             this.pass_but_encrty.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
123.             this.pass_but_encrty.ForeColor = System.Drawing.Color.Red;
124.             this.pass_but_encrty.Location = new System.Drawing.Point(40, 212);
125.             this.pass_but_encrty.Name = "pass_but_encrty";
126.             this.pass_but_encrty.Size = new System.Drawing.Size(77, 34);
127.             this.pass_but_encrty.TabIndex = 6;
128.             this.pass_but_encrty.Text = "加密";
129.             this.pass_but_encrty.UseVisualStyleBackColor = true;
130.             this.pass_but_encrty.Click += new System.EventHandler(this.pass_but_encrty_Click);
131.             // 
132.             // pass_but_decrty
133.             // 
134.             this.pass_but_decrty.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
135.             this.pass_but_decrty.ForeColor = System.Drawing.Color.Lime;
136.             this.pass_but_decrty.Location = new System.Drawing.Point(201, 212);
137.             this.pass_but_decrty.Name = "pass_but_decrty";
138.             this.pass_but_decrty.Size = new System.Drawing.Size(77, 34);
139.             this.pass_but_decrty.TabIndex = 7;
140.             this.pass_but_decrty.Text = "解密";
141.             this.pass_but_decrty.UseVisualStyleBackColor = true;
142.             this.pass_but_decrty.Click += new System.EventHandler(this.pass_but_decrty_Click);
143.             // 
144.             // del_file_checkBox
145.             // 
146.             this.del_file_checkBox.AutoSize = true;
147.             this.del_file_checkBox.BackColor = System.Drawing.Color.Transparent;
148.             this.del_file_checkBox.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
149.             this.del_file_checkBox.Location = new System.Drawing.Point(40, 269);
150.             this.del_file_checkBox.Name = "del_file_checkBox";
151.             this.del_file_checkBox.Size = new System.Drawing.Size(128, 24);
152.             this.del_file_checkBox.TabIndex = 8;
153.             this.del_file_checkBox.Text = "删除源文件";
154.             this.del_file_checkBox.UseVisualStyleBackColor = false;
155.             // 
156.             // label4
157.             // 
158.             this.label4.AutoSize = true;
159.             this.label4.BackColor = System.Drawing.Color.Transparent;
160.             this.label4.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
161.             this.label4.Location = new System.Drawing.Point(18, 119);
162.             this.label4.Name = "label4";
163.             this.label4.Size = new System.Drawing.Size(119, 20);
164.             this.label4.TabIndex = 10;
165.             this.label4.Text = "密 码 强 度";
166.             // 
167.             // timer1
168.             // 
169.             this.timer1.Interval = 500;
170.             this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
171.             // 
172.             // label5
173.             // 
174.             this.label5.AutoSize = true;
175.             this.label5.BackColor = System.Drawing.Color.White;
176.             this.label5.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
177.             this.label5.ForeColor = System.Drawing.Color.Red;
178.             this.label5.Location = new System.Drawing.Point(172, 119);
179.             this.label5.Name = "label5";
180.             this.label5.Size = new System.Drawing.Size(69, 20);
181.             this.label5.TabIndex = 11;
182.             this.label5.Text = "非常弱";
183.             // 
184.             // MainForm
185.             // 
186.             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
187.             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
188.             this.BackColor = System.Drawing.SystemColors.InactiveCaptionText;
189.             this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
190.             this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
191.             this.ClientSize = new System.Drawing.Size(366, 314);
192.             this.Controls.Add(this.label5);
193.             this.Controls.Add(this.label4);
194.             this.Controls.Add(this.del_file_checkBox);
195.             this.Controls.Add(this.pass_but_decrty);
196.             this.Controls.Add(this.pass_but_encrty);
197.             this.Controls.Add(this.label3);
198.             this.Controls.Add(this.label2);
199.             this.Controls.Add(this.pass_tb_second);
200.             this.Controls.Add(this.pass_tb_first);
201.             this.Controls.Add(this.label1);
202.             this.Controls.Add(this.pass_cb_style);
203.             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
204.             this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
205.             this.MaximizeBox = false;
206.             this.MinimizeBox = false;
207.             this.Name = "MainForm";
208.             this.Text = "加密与解密";
209.             this.Load += new System.EventHandler(this.Form1_Load);
210.             this.ResumeLayout(false);
211.             this.PerformLayout();
213.         }
215.         #endregion
217.         private System.Windows.Forms.ComboBox pass_cb_style;
218.         private System.Windows.Forms.Label label1;
219.         private System.Windows.Forms.TextBox pass_tb_first;
220.         private System.Windows.Forms.TextBox pass_tb_second;
221.         private System.Windows.Forms.Label label2;
222.         private System.Windows.Forms.Label label3;
223.         private System.Windows.Forms.Button pass_but_encrty;
224.         private System.Windows.Forms.Button pass_but_decrty;
225.         private System.Windows.Forms.CheckBox del_file_checkBox;
226.         private System.Windows.Forms.Label label4;
227.         private System.Windows.Forms.Timer timer1;
228.         private System.Windows.Forms.Label label5;
229.     }
230. }

其中控件的一些名称如表所示：

控件类别	控件名称	控件的用途
下拉式列表框	pass_cb_style	用来选择加密的算法
文本框	pass_tb_first	让用户输入密码
文本框	pass_tb_second	让用户输入密码，验证密码
按钮	pass_but_encrty	加密按钮
按钮	pass_but_decrty	解密按钮
标签	label5	指示密码强度
复选框	del_file_checkBox	是否删除源文件复选框

 

其中还放置了一个Timer控件，主要用来测试密码强度。

下面就是界面部分编制的代码了

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Text;
7. using System.Windows.Forms;
8. using System.IO;
10. namespace PassWord
11. {
12.     public partial class MainForm : Form
13.     {
14.         private string InputFile = string.Empty;
15.         private string OutputFile = string.Empty;
16.         private string algrorithmName = "DES";
17.         private int lowerChar = 0;//用来标志小写字母
18.         private int upperChar = 0;//用来标志大写字母
19.         private int numChar = 0;//用来标志数字
20.         private int otherChar = 0;//用来标志其他字符
21.         private int userPassLen = 0;
22.         private int userPassScore = 0;
25.         public MainForm()
26.         {
27.             InitializeComponent();
28.         }
30.         private void Form1_Load(object sender, EventArgs e)
31.         {
32.             
33.             pass_cb_style.Text = "DES";
34.             pass_but_encrty.Enabled = false;
35.             pass_but_decrty.Enabled = false;
36.             timer1.Enabled = false;
37.         }
38.         private void pass_but_encrty_Click(object sender, EventArgs e)
39.         {
40.             string Key = GetKey();
41.             string IV = GetIV();
42.             CryptoHelper encFile = new CryptoHelper(algrorithmName, Key, IV);
43.             GetIOFileName();
44.             if (InputFile != null && OutputFile != null)
45.             {
46.                 try
47.                 {
48.                     encFile.EncryptFile(InputFile, OutputFile);
49.                     MessageBox.Show("加密成功！！！", "恭喜！成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
50.                     if (del_file_checkBox.Checked == true)
51.                         DeleteFile(InputFile);
52.                 }
53.                 catch
54.                 {
55.                     MessageBox.Show("加密失败", "十分遗憾", MessageBoxButtons.OK, MessageBoxIcon.Error);
56.                 }
57.             }
58.         }
60.         private void pass_but_decrty_Click(object sender, EventArgs e)
61.         {
62.             string Key = GetKey();
63.             string IV = GetIV();
64.             CryptoHelper decFile = new CryptoHelper(algrorithmName, Key, IV);
65.             GetIOFileName();
66.             if (InputFile != null && OutputFile != null)
67.             {
68.                 try
69.                 {
70.                     decFile.DecryptFile(InputFile, OutputFile);
71.                     MessageBox.Show("解密成功！！！", "恭喜！成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
72.                     if (del_file_checkBox.Checked == true)
73.                         DeleteFile(InputFile);
74.                 }
75.                 catch
76.                 {
77.                     MessageBox.Show("解密失败", "十分遗憾", MessageBoxButtons.OK, MessageBoxIcon.Error);
78.                 }
79.             }
80.         }
81.         /// <summary>
82.         /// 删除文件的函数
83.         /// </summary>
84.         /// <param name="filename">文件名</param>
85.         public void DeleteFile(string filename)
86.         {
87.             try
88.             {
89.                 File.Delete(filename);
90.             }
91.             catch (Exception e)
92.             {
93.                 MessageBox.Show(e.ToString());
94.             }
95.         }
96.         /// <summary>
97.         /// 得到输入/输出的文件名
98.         /// </summary>
99.         public void GetIOFileName()
100.         {
101.             OpenFileDialog openFile = new OpenFileDialog();
102.             openFile.Filter = "All files (*.*)|*.*";
103.             openFile.Title = "请你选择源文件";
104.             if (openFile.ShowDialog() == DialogResult.OK)
105.             {
106.                 InputFile = openFile.FileName;
107.                 SaveFileDialog saveFile = new SaveFileDialog();
108.                 saveFile.Filter = "All files (*.*)|*.*";
109.                 saveFile.Title = "请你选择目标文件";
110.                 if (saveFile.ShowDialog() == DialogResult.OK)
111.                 {
112.                     OutputFile = saveFile.FileName;
113.                     if (OutputFile == InputFile)
114.                     {
115.                         OutputFile = null;
116.                         MessageBox.Show("源文件不能与目标文件为同一个文件", "错误", MessageBoxButtons.OK);
117.                     }
118.                 }
119.                 else
120.                     OutputFile = null;
121.             }
122.             else
123.                 InputFile = null;
124.         }
125.         /// <summary>
126.         /// 得到算法名称，默认为DES
127.         /// </summary>
128.         /// <param name="sender"></param>
129.         /// <param name="e"></param>
130.         private void pass_cb_style_SelectedIndexChanged(object sender, EventArgs e)
131.         {
132.             algrorithmName = pass_cb_style.Text;
133.         }
134.         /// <summary>
135.         /// 设置密码强度
136.         /// </summary>
137.         /// <param name="sender"></param>
138.         /// <param name="e"></param>
139.         private void pass_tb_first_KeyUp(object sender, KeyEventArgs e)
140.         {            
141.         }
143.         private void pass_tb_second_Leave(object sender, EventArgs e)
144.         {
145.             if (pass_tb_first.Text != pass_tb_second.Text)
146.             {
147.                 MessageBox.Show("两次输入的密码不一致", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
148.                 pass_tb_second.Text = "";
149.             }
150.         }
152.         private void pass_tb_second_KeyUp(object sender, KeyEventArgs e)
153.         {
154.             if (pass_tb_first.Text == pass_tb_second.Text)
155.             {
156.                 pass_but_decrty.Enabled = true;
157.                 pass_but_encrty.Enabled = true;
158.             }
159.             else
160.             {
161.                 pass_but_decrty.Enabled = false;
162.                 pass_but_encrty.Enabled = false;
163.             }
164.         }
165.         /// <summary>
166.         /// 得到密码
167.         /// </summary>
168.         /// <returns></returns>
169.         private string GetKey()
170.         {
171.             string passWord = pass_tb_first.Text;
172.             int[] LegalLength = new int[4];
173.             LegalLength = CryptoHelper.GetKeyLength(algrorithmName);
174.             int plength = passWord.Length;
175.             switch (algrorithmName)
176.             {
177.                 case "DES":
178.                     {
179.                         if (plength == LegalLength[0] / 8)
180.                             passWord = pass_tb_first.Text;
181.                         if (plength > LegalLength[0] / 8)
182.                             passWord = pass_tb_first.Text.Substring(0, 8);
183.                         if (plength < LegalLength[0] / 8)
184.                             passWord = RepeatStr(pass_tb_first.Text, 8);
185.                         break;
186.                     }
187.                 case "RC2":
188.                     {
189.                         if (plength >= LegalLength[0] / 8 && plength <= LegalLength[1] / 8)
190.                             passWord = pass_tb_first.Text;
191.                         if (plength > LegalLength[1] / 8)
192.                             passWord = pass_tb_first.Text.Substring(0, 16);
193.                         if (plength < LegalLength[0] / 8)
194.                             passWord = RepeatStr(pass_tb_first.Text, 5);
195.                         break;
196.                     }
197.                 case "TripleDES":
198.                     {
199.                         if (plength >= LegalLength[0] / 8 && plength <= LegalLength[1] / 8)
200.                         {
201.                             passWord = pass_tb_first.Text;
202.                             if (plength % 2 != 0)
203.                             {
204.                                 passWord += passWord.Substring(0, 1);
205.                                 plength = passWord.Length;
206.                             }
207.                         }
208.                         if (plength > LegalLength[1] / 8)
209.                             passWord = pass_tb_first.Text.Substring(0, 24);
210.                         if (plength < LegalLength[0] / 8)
211.                             passWord = RepeatStr(pass_tb_first.Text, 16);
212.                         break;
213.                     }
214.                 case "Rijndael":
215.                     {
216.                         passWord = pass_tb_first.Text;
217.                         if (plength < LegalLength[0] / 8)
218.                             passWord = RepeatStr(passWord, 16);
219.                         if (plength < LegalLength[1] / 8)
220.                             passWord = RepeatStr(passWord, 24);
221.                         if (plength < LegalLength[2] / 8)
222.                             passWord = RepeatStr(passWord, 32);
223.                         break;
224.                     }
226.             }
227.             return passWord;
228.         }
229.         /// <summary>
230.         /// 得到加密的块
231.         /// </summary>
232.         /// <returns>符合要求的块</returns>
233.         private string GetIV()
234.         {
235.             string iv = pass_tb_first.Text;
236.             int len = iv.Length;
237.             switch (algrorithmName)
238.             {
239.                 case "Rijndael":
240.                     {
241.                         if (len < 16)
242.                             iv = RepeatStr(pass_tb_first.Text, 16);
243.                         else
244.                             iv = pass_tb_first.Text.Substring(0, 16);
245.                         break;
246.                     }
247.                 default:
248.                     {
249.                         if (len < 8)
250.                             iv = RepeatStr(pass_tb_first.Text, 8);
251.                         else
252.                             iv = pass_tb_first.Text.Substring(0, 8);
253.                         break;
254.                     }
255.             }
256.             return iv;
258.         }
259.         /// <summary>
260.         /// 重复字符串到指定的长度
261.         /// </summary>
262.         /// <param name="str">字符串</param>
263.         /// <param name="length">指定长度</param>
264.         /// <returns>符合要求字符串</returns>
265.         private string RepeatStr(string str, int length)
266.         {
267.             int lenold = str.Length;
268.             string temp = str;
269.             int len = lenold;
270.             if (len >= length)
271.                 return str;
272.             while (len < length)
273.             {
274.                 if (length - len < lenold)
275.                 {
276.                     str += str.Substring(0, length - len);
277.                     len += length - len;
278.                 }
279.                 else
280.                 {
281.                     str += temp;
282.                     len += lenold;
283.                 }
284.             }
285.             return str;
286.         }
288.         private void timer1_Tick(object sender, EventArgs e)
289.         {
290.             // 一、密码长度:
291.             //5 分: 小于等于 4 个字符 
292.             //10 分: 5 到 7 字符 
293.             //25 分: 大于等于 8 个字符 
294.             //二、字母:
295.             //0 分: 没有字母 
296.             //10 分: 全都是小（大）写字母 
297.             //20 分: 大小写混合字母 
298.             //三、数字:
299.             //0 分: 没有数字 
300.             //10 分: 1 个数字 
301.             //20 分: 大于等于 3 个数字 
302.             //四、符号:
303.             //0 分: 没有符号 
304.             //10 分: 1 个符号 
305.             //25 分: 大于 1 个符号 
306.             //五、奖励:
307.             //2 分: 字母和数字 
308.             //3 分: 字母、数字和符号 
309.             //5 分: 大小写字母、数字和符号 
310.             //最后的评分标准:
311.             //>= 90: 非常安全 
312.             //>= 80: 安全（Secure） 
313.             //>= 70: 非常强 
314.             //>= 60: 强（Strong） 
315.             //>= 50: 一般（Average） 
316.             //>= 25: 弱（Weak） 
317.             //>= 0: 非常弱 
318.             userPassScore = 0;
319.             userPassLen = 0;
320.             userPassLen=pass_tb_first.Text.Length;
321.             lowerChar = 0;
322.             upperChar = 0;
323.             numChar = 0;
324.             otherChar = 0;            
325.             foreach (char c in pass_tb_first.Text.ToCharArray())
326.             {
327.                 if (Char.IsLower(c))
328.                 {
329.                     lowerChar++;
330.                 }
331.                 if (Char.IsUpper(c))
332.                 {
333.                     upperChar++;
334.                 }
335.                 if (Char.IsDigit(c))
336.                 {
337.                     numChar++;
338.                 }
339.                 if (Char.IsSymbol(c) || Char.IsPunctuation(c) || Char.IsSeparator(c) || Char.IsWhiteSpace(c))
340.                 {
341.                     otherChar++;
342.                 }
343.             }
344.             //长度
345.             if (userPassLen <= 4 && userPassLen!=0)
346.                 userPassScore = 5;
347.             if (userPassLen >= 5 && userPassLen <= 7)
348.                 userPassScore = 10;
349.             if (userPassLen >= 8)
350.                 userPassScore = 25;
351.             if ((lowerChar != 0 || upperChar != 0) && (userPassLen == lowerChar || userPassLen == upperChar))
352.             {
353.                 userPassScore += 10;
354.             }
355.             if ((lowerChar != 0 ||upperChar != 0 )&& (userPassLen != lowerChar || userPassLen != upperChar))
356.             {
357.                 userPassScore += 20;
358.             }
359.             if (numChar != 0)
360.             {
361.                 userPassScore += 10;
362.                 if (numChar > 3)
363.                     userPassScore += 20;
364.             }
365.             if (otherChar != 0)
366.             {
367.                 userPassScore += 10;
368.                 if (otherChar > 3)
369.                     userPassScore += 25;
370.             }
371.             if (lowerChar != 0 && upperChar != 0 && numChar != 0 && otherChar != 0)
372.             {
373.                 userPassScore += 5;
374.             }
375.             if(userPassScore<25)
376.                 label5.Text = "非常弱";
377.             if (userPassScore >= 25 && userPassScore < 50)
378.             {
379.                 label5.Text = "弱";
380.                 label5.ForeColor = System.Drawing.Color.Red;
381.             }
382.             if (userPassScore >= 50 && userPassScore < 60)
383.             {
384.                 label5.Text = "一般";
385.                 label5.ForeColor = System.Drawing.Color.Blue;
386.             }
387.             if (userPassScore >= 60 && userPassScore < 70)
388.             {
389.                 label5.Text = "强";
390.                 label5.ForeColor = System.Drawing.Color.YellowGreen;
391.             }
392.             if (userPassScore >= 70 && userPassScore < 80)
393.             {
394.                 label5.Text = "非常强";
395.                 label5.ForeColor = System.Drawing.Color.LightGreen;
396.             }
397.             if (userPassScore >= 80 && userPassScore < 90)
398.             {
399.                 label5.Text = "安全";
400.                 label5.ForeColor = System.Drawing.Color.GreenYellow;
401.             }
402.             if (userPassScore >= 90)
403.             {
404.                 label5.Text = "非常安全";
405.                 label5.ForeColor = System.Drawing.Color.Green;
406.             }
407.         }
409.         private void pass_tb_first_Enter(object sender, EventArgs e)
410.         {
411.             timer1.Enabled = true;
412.         }
414.         private void pass_tb_first_Leave(object sender, EventArgs e)
415.         {
416.             timer1.Enabled = false;
417.         }
419.     }
420. }

最后的一点补充说明

加密算法名称	密钥位数（KEY）	初始化向量（IV）
DES	64位	64位
RC2	40位到128位，位数递增8	64位
Rijndael	128，192，256	128--256 每次递增64位
TripleDES	128位到192位	64位