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。

using System;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

using System.IO;

namespace PassWord

{

class CryptoHelper

{

private SymmetricAlgorithm provider;

private ICryptoTransform encryptor;

private ICryptoTransform decryptor;

private const int per_length = 100;

/// <summary>

/// 返回每个加密方法的KEY的长度

/// </summary>

/// <param name="algrorithmName">算法名</param>

/// <returns>整型数组</returns>

/// 如果数组的第四个数据是0，那么

/// 数组的第一个数据是KEY的最少位

/// 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

/// 数组的第三个数据是KEY的跳跃值

/// 如果数组的第四个数据是-1

/// 数组的第一个数据是KEY可以支持的第一种位数

/// 数组的第二个数据是KEY可以支持的第二种位数

/// 数组的第三个数据是KEY可以支持的第三种位数

public static int [] GetKeyLength(string algrorithmName)

{

int[] Int_Key = new int[4] { 0,0,0,0};

switch (algrorithmName)

{

case "DES":

{

Int_Key[0] = 64;

Int_Key[1] = 0;

Int_Key[2] = 0;

Int_Key[3] = 0;

return Int_Key;

}

case "RC2":

{

Int_Key[0] = 40;

Int_Key[1] = 128;

Int_Key[2] = 8;

Int_Key[3] = 0;

return Int_Key;

}

case "Rijndael":

{

Int_Key[0] = 128;

Int_Key[1] = 192;

Int_Key[2] = 256;

Int_Key[3] = -1;

return Int_Key;

}

case "TripleDES":

{

Int_Key[0] = 128;

Int_Key[1] = 192;

Int_Key[2] = 64;

Int_Key[3] = 0;

return Int_Key;

}

}

return Int_Key;

}

/// <summary>

/// 构造函数，用来生成具体的加密与解密的对象

/// </summary>

/// <param name="algrorithmName">加密或者解密的算法名称</param>

/// <param name="Key">加密或解密的密钥</param>

/// <param name="IV">加密或者解密的初始化向量</param>

public CryptoHelper(string algrorithmName, string Key, string IV)

{

provider = SymmetricAlgorithm.Create(algrorithmName);

provider.Key = Encoding.UTF8.GetBytes(Key);

provider.IV = Encoding.UTF8.GetBytes(IV);

encryptor = provider.CreateEncryptor();

decryptor = provider.CreateDecryptor();

}

~CryptoHelper()

{

provider.Clear();

}

/// <summary>

/// 加密文件的方法

/// </summary>

/// <param name="inName">源文件名</param>

/// <param name="outName">目的文件名</param>

public void EncryptFile(String inName, String outName)

{

//建立文件流用来处理源文件与目的文件

FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);

FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

fout.SetLength(0);

//建立变量用来处理文件的读写

byte[] bin = new byte[per_length]; //加密的长度

long rdlen = 0; //读取数据的总长度

long totlen = fin.Length; //输入文件的总长度

int len; //每次读写数据的长度

CryptoStream encStream = new CryptoStream(fout,encryptor, CryptoStreamMode.Write);

//开始加密的过程

while (rdlen < totlen)

{

len = fin.Read(bin, 0, per_length);

encStream.Write(bin, 0, len);

rdlen = rdlen + len;

}

encStream.Flush();

encStream.Close();

fout.Close();

fin.Close();

}

/// <summary>

/// 解密文件的算法

/// </summary>

/// <param name="inName">源文件名</param>

/// <param name="outName">目标文件名</param>

public void DecryptFile(String inName, String outName)

{

//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

FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);

FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

fout.SetLength(0);

//建立变量用来处理文件的读写

byte[] bin = new byte[per_length]; //加密的长度

long rdlen = 0; //读取数据的总长度

long totlen = fin.Length; //输入文件的总长度

int len; //每次读写数据的长度

CryptoStream decStream = new CryptoStream(fout,decryptor, CryptoStreamMode.Write);

//开始解密的过程

while (rdlen < totlen)

{

len = fin.Read(bin, 0, per_length);

decStream.Write(bin, 0, len);

rdlen = rdlen + len;

}

decStream.Flush();

decStream.Close();

fout.Close();

fin.Close();

}

}

}

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

namespace PassWord

{

partial class MainForm

{

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.IContainer components = null;

/// <summary>

/// 清理所有正在使用的资源。

/// </summary>

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#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()

{

this.components = new System.ComponentModel.Container();

System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));

this.pass_cb_style = new System.Windows.Forms.ComboBox();

this.label1 = new System.Windows.Forms.Label();

this.pass_tb_first = new System.Windows.Forms.TextBox();

this.pass_tb_second = new System.Windows.Forms.TextBox();

this.label2 = new System.Windows.Forms.Label();

this.label3 = new System.Windows.Forms.Label();

this.pass_but_encrty = new System.Windows.Forms.Button();

this.pass_but_decrty = new System.Windows.Forms.Button();

this.del_file_checkBox = new System.Windows.Forms.CheckBox();

this.label4 = new System.Windows.Forms.Label();

this.timer1 = new System.Windows.Forms.Timer(this.components);

this.label5 = new System.Windows.Forms.Label();

this.SuspendLayout();

//

// pass_cb_style

//

this.pass_cb_style.BackColor = System.Drawing.SystemColors.InactiveCaptionText;

this.pass_cb_style.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;

this.pass_cb_style.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.pass_cb_style.FormattingEnabled = true;

this.pass_cb_style.Items.AddRange(new object[] {

"DES",

"RC2",

"Rijndael",

"TripleDES"});

this.pass_cb_style.Location = new System.Drawing.Point(174, 16);

this.pass_cb_style.Name = "pass_cb_style";

this.pass_cb_style.Size = new System.Drawing.Size(167, 30);

this.pass_cb_style.TabIndex = 0;

this.pass_cb_style.SelectedIndexChanged += new System.EventHandler(this.pass_cb_style_SelectedIndexChanged);

//

// label1

//

this.label1.AutoSize = true;

this.label1.BackColor = System.Drawing.Color.Transparent;

this.label1.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.label1.Location = new System.Drawing.Point(18, 20);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(149, 20);

this.label1.TabIndex = 1;

this.label1.Text = "选择加密的算法";

//

// pass_tb_first

//

this.pass_tb_first.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.pass_tb_first.Location = new System.Drawing.Point(174, 71);

this.pass_tb_first.Name = "pass_tb_first";

this.pass_tb_first.PasswordChar = '*';

this.pass_tb_first.Size = new System.Drawing.Size(167, 30);

this.pass_tb_first.TabIndex = 2;

this.pass_tb_first.Leave += new System.EventHandler(this.pass_tb_first_Leave);

this.pass_tb_first.KeyUp += new System.Windows.Forms.KeyEventHandler(this.pass_tb_first_KeyUp);

this.pass_tb_first.Enter += new System.EventHandler(this.pass_tb_first_Enter);

//

// pass_tb_second

//

this.pass_tb_second.Font = new System.Drawing.Font("Times New Roman", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

this.pass_tb_second.Location = new System.Drawing.Point(176, 164);

this.pass_tb_second.Name = "pass_tb_second";

this.pass_tb_second.PasswordChar = '*';

this.pass_tb_second.Size = new System.Drawing.Size(165, 30);

this.pass_tb_second.TabIndex = 3;

this.pass_tb_second.Leave += new System.EventHandler(this.pass_tb_second_Leave);

this.pass_tb_second.KeyUp += new System.Windows.Forms.KeyEventHandler(this.pass_tb_second_KeyUp);

//

// label2

//

this.label2.AutoSize = true;

this.label2.BackColor = System.Drawing.Color.Transparent;

this.label2.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.label2.Location = new System.Drawing.Point(18, 76);

this.label2.Name = "label2";

this.label2.Size = new System.Drawing.Size(129, 20);

this.label2.TabIndex = 4;

this.label2.Text = "初次输入密码";

//

// label3

//

this.label3.AutoSize = true;

this.label3.BackColor = System.Drawing.Color.Transparent;

this.label3.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.label3.Location = new System.Drawing.Point(18, 169);

this.label3.Name = "label3";

this.label3.Size = new System.Drawing.Size(129, 20);

this.label3.TabIndex = 5;

this.label3.Text = "再次输入密码";

//

// pass_but_encrty

//

this.pass_but_encrty.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.pass_but_encrty.ForeColor = System.Drawing.Color.Red;

this.pass_but_encrty.Location = new System.Drawing.Point(40, 212);

this.pass_but_encrty.Name = "pass_but_encrty";

this.pass_but_encrty.Size = new System.Drawing.Size(77, 34);

this.pass_but_encrty.TabIndex = 6;

this.pass_but_encrty.Text = "加密";

this.pass_but_encrty.UseVisualStyleBackColor = true;

this.pass_but_encrty.Click += new System.EventHandler(this.pass_but_encrty_Click);

//

// pass_but_decrty

//

this.pass_but_decrty.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.pass_but_decrty.ForeColor = System.Drawing.Color.Lime;

this.pass_but_decrty.Location = new System.Drawing.Point(201, 212);

this.pass_but_decrty.Name = "pass_but_decrty";

this.pass_but_decrty.Size = new System.Drawing.Size(77, 34);

this.pass_but_decrty.TabIndex = 7;

this.pass_but_decrty.Text = "解密";

this.pass_but_decrty.UseVisualStyleBackColor = true;

this.pass_but_decrty.Click += new System.EventHandler(this.pass_but_decrty_Click);

//

// del_file_checkBox

//

this.del_file_checkBox.AutoSize = true;

this.del_file_checkBox.BackColor = System.Drawing.Color.Transparent;

this.del_file_checkBox.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.del_file_checkBox.Location = new System.Drawing.Point(40, 269);

this.del_file_checkBox.Name = "del_file_checkBox";

this.del_file_checkBox.Size = new System.Drawing.Size(128, 24);

this.del_file_checkBox.TabIndex = 8;

this.del_file_checkBox.Text = "删除源文件";

this.del_file_checkBox.UseVisualStyleBackColor = false;

//

// label4

//

this.label4.AutoSize = true;

this.label4.BackColor = System.Drawing.Color.Transparent;

this.label4.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.label4.Location = new System.Drawing.Point(18, 119);

this.label4.Name = "label4";

this.label4.Size = new System.Drawing.Size(119, 20);

this.label4.TabIndex = 10;

this.label4.Text = "密 码 强 度";

//

// timer1

//

this.timer1.Interval = 500;

this.timer1.Tick += new System.EventHandler(this.timer1_Tick);

//

// label5

//

this.label5.AutoSize = true;

this.label5.BackColor = System.Drawing.Color.White;

this.label5.Font = new System.Drawing.Font("楷体_GB2312", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.label5.ForeColor = System.Drawing.Color.Red;

this.label5.Location = new System.Drawing.Point(172, 119);

this.label5.Name = "label5";

this.label5.Size = new System.Drawing.Size(69, 20);

this.label5.TabIndex = 11;

this.label5.Text = "非常弱";

//

// MainForm

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.BackColor = System.Drawing.SystemColors.InactiveCaptionText;

this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));

this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;

this.ClientSize = new System.Drawing.Size(366, 314);

this.Controls.Add(this.label5);

this.Controls.Add(this.label4);

this.Controls.Add(this.del_file_checkBox);

this.Controls.Add(this.pass_but_decrty);

this.Controls.Add(this.pass_but_encrty);

this.Controls.Add(this.label3);

this.Controls.Add(this.label2);

this.Controls.Add(this.pass_tb_second);

this.Controls.Add(this.pass_tb_first);

this.Controls.Add(this.label1);

this.Controls.Add(this.pass_cb_style);

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;

this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

this.MaximizeBox = false;

this.MinimizeBox = false;

this.Name = "MainForm";

this.Text = "加密与解密";

this.Load += new System.EventHandler(this.Form1_Load);

this.ResumeLayout(false);

this.PerformLayout();

}

#endregion

private System.Windows.Forms.ComboBox pass_cb_style;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.TextBox pass_tb_first;

private System.Windows.Forms.TextBox pass_tb_second;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.Label label3;

private System.Windows.Forms.Button pass_but_encrty;

private System.Windows.Forms.Button pass_but_decrty;

private System.Windows.Forms.CheckBox del_file_checkBox;

private System.Windows.Forms.Label label4;

private System.Windows.Forms.Timer timer1;

private System.Windows.Forms.Label label5;

}

}

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

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

namespace PassWord

{

public partial class MainForm : Form

{

private string InputFile = string.Empty;

private string OutputFile = string.Empty;

private string algrorithmName = "DES";

private int lowerChar = 0;//用来标志小写字母

private int upperChar = 0;//用来标志大写字母

private int numChar = 0;//用来标志数字

private int otherChar = 0;//用来标志其他字符

private int userPassLen = 0;

private int userPassScore = 0;

public MainForm()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

pass_cb_style.Text = "DES";

pass_but_encrty.Enabled = false;

pass_but_decrty.Enabled = false;

timer1.Enabled = false;

}

private void pass_but_encrty_Click(object sender, EventArgs e)

{

string Key = GetKey();

string IV = GetIV();

CryptoHelper encFile = new CryptoHelper(algrorithmName, Key, IV);

GetIOFileName();

if (InputFile != null && OutputFile != null)

{

try

{

encFile.EncryptFile(InputFile, OutputFile);

MessageBox.Show("加密成功！！！", "恭喜！成功", MessageBoxButtons.OK, MessageBoxIcon.Information);

if (del_file_checkBox.Checked == true)

DeleteFile(InputFile);

}

catch

{

MessageBox.Show("加密失败", "十分遗憾", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

}

}

private void pass_but_decrty_Click(object sender, EventArgs e)

{

string Key = GetKey();

string IV = GetIV();

CryptoHelper decFile = new CryptoHelper(algrorithmName, Key, IV);

GetIOFileName();

if (InputFile != null && OutputFile != null)

{

try

{

decFile.DecryptFile(InputFile, OutputFile);

MessageBox.Show("解密成功！！！", "恭喜！成功", MessageBoxButtons.OK, MessageBoxIcon.Information);

if (del_file_checkBox.Checked == true)

DeleteFile(InputFile);

}

catch

{

MessageBox.Show("解密失败", "十分遗憾", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

}

}

/// <summary>

/// 删除文件的函数

/// </summary>

/// <param name="filename">文件名</param>

public void DeleteFile(string filename)

{

try

{

File.Delete(filename);

}

catch (Exception e)

{

MessageBox.Show(e.ToString());

}

}

/// <summary>

/// 得到输入/输出的文件名

/// </summary>

public void GetIOFileName()

{

OpenFileDialog openFile = new OpenFileDialog();

openFile.Filter = "All files (*.*)|*.*";

openFile.Title = "请你选择源文件";

if (openFile.ShowDialog() == DialogResult.OK)

{

InputFile = openFile.FileName;

SaveFileDialog saveFile = new SaveFileDialog();

saveFile.Filter = "All files (*.*)|*.*";

saveFile.Title = "请你选择目标文件";

if (saveFile.ShowDialog() == DialogResult.OK)

{

OutputFile = saveFile.FileName;

if (OutputFile == InputFile)

{

OutputFile = null;

MessageBox.Show("源文件不能与目标文件为同一个文件", "错误", MessageBoxButtons.OK);

}

}

else

OutputFile = null;

}

else

InputFile = null;

}

/// <summary>

/// 得到算法名称，默认为DES

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void pass_cb_style_SelectedIndexChanged(object sender, EventArgs e)

{

algrorithmName = pass_cb_style.Text;

}

/// <summary>

/// 设置密码强度

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void pass_tb_first_KeyUp(object sender, KeyEventArgs e)

{

}

private void pass_tb_second_Leave(object sender, EventArgs e)

{

if (pass_tb_first.Text != pass_tb_second.Text)

{

MessageBox.Show("两次输入的密码不一致", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);

pass_tb_second.Text = "";

}

}

private void pass_tb_second_KeyUp(object sender, KeyEventArgs e)

{

if (pass_tb_first.Text == pass_tb_second.Text)

{

pass_but_decrty.Enabled = true;

pass_but_encrty.Enabled = true;

}

else

{

pass_but_decrty.Enabled = false;

pass_but_encrty.Enabled = false;

}

}

/// <summary>

/// 得到密码

/// </summary>

/// <returns></returns>

private string GetKey()

{

string passWord = pass_tb_first.Text;

int[] LegalLength = new int[4];

LegalLength = CryptoHelper.GetKeyLength(algrorithmName);

int plength = passWord.Length;

switch (algrorithmName)

{

case "DES":

{

if (plength == LegalLength[0] / 8)

passWord = pass_tb_first.Text;

if (plength > LegalLength[0] / 8)

passWord = pass_tb_first.Text.Substring(0, 8);

if (plength < LegalLength[0] / 8)

passWord = RepeatStr(pass_tb_first.Text, 8);

break;

}

case "RC2":

{

if (plength >= LegalLength[0] / 8 && plength <= LegalLength[1] / 8)

passWord = pass_tb_first.Text;

if (plength > LegalLength[1] / 8)

passWord = pass_tb_first.Text.Substring(0, 16);

if (plength < LegalLength[0] / 8)

passWord = RepeatStr(pass_tb_first.Text, 5);

break;

}

case "TripleDES":

{

if (plength >= LegalLength[0] / 8 && plength <= LegalLength[1] / 8)

{

passWord = pass_tb_first.Text;

if (plength % 2 != 0)

{

passWord += passWord.Substring(0, 1);

plength = passWord.Length;

}

}

if (plength > LegalLength[1] / 8)

passWord = pass_tb_first.Text.Substring(0, 24);

if (plength < LegalLength[0] / 8)

passWord = RepeatStr(pass_tb_first.Text, 16);

break;

}

case "Rijndael":

{

passWord = pass_tb_first.Text;

if (plength < LegalLength[0] / 8)

passWord = RepeatStr(passWord, 16);

if (plength < LegalLength[1] / 8)

passWord = RepeatStr(passWord, 24);

if (plength < LegalLength[2] / 8)

passWord = RepeatStr(passWord, 32);

break;

}

}

return passWord;

}

/// <summary>

/// 得到加密的块

/// </summary>

/// <returns>符合要求的块</returns>

private string GetIV()

{

string iv = pass_tb_first.Text;

int len = iv.Length;

switch (algrorithmName)

{

case "Rijndael":

{

if (len < 16)

iv = RepeatStr(pass_tb_first.Text, 16);

else

iv = pass_tb_first.Text.Substring(0, 16);

break;

}

default:

{

if (len < 8)

iv = RepeatStr(pass_tb_first.Text, 8);

else

iv = pass_tb_first.Text.Substring(0, 8);

break;

}

}

return iv;

}

/// <summary>

/// 重复字符串到指定的长度

/// </summary>

/// <param name="str">字符串</param>

/// <param name="length">指定长度</param>

/// <returns>符合要求字符串</returns>

private string RepeatStr(string str, int length)

{

int lenold = str.Length;

string temp = str;

int len = lenold;

if (len >= length)

return str;

while (len < length)

{

if (length - len < lenold)

{

str += str.Substring(0, length - len);

len += length - len;

}

else

{

str += temp;

len += lenold;

}

}

return str;

}

private void timer1_Tick(object sender, EventArgs e)

{

// 一、密码长度:

//5 分: 小于等于 4 个字符

//10 分: 5 到 7 字符

//25 分: 大于等于 8 个字符

//二、字母:

//0 分: 没有字母

//10 分: 全都是小（大）写字母

//20 分: 大小写混合字母

//三、数字:

//0 分: 没有数字

//10 分: 1 个数字

//20 分: 大于等于 3 个数字

//四、符号:

//0 分: 没有符号

//10 分: 1 个符号

//25 分: 大于 1 个符号

//五、奖励:

//2 分: 字母和数字

//3 分: 字母、数字和符号

//5 分: 大小写字母、数字和符号

//最后的评分标准:

//>= 90: 非常安全

//>= 80: 安全（Secure）

//>= 70: 非常强

//>= 60: 强（Strong）

//>= 50: 一般（Average）

//>= 25: 弱（Weak）

//>= 0: 非常弱

userPassScore = 0;

userPassLen = 0;

userPassLen=pass_tb_first.Text.Length;

lowerChar = 0;

upperChar = 0;

numChar = 0;

otherChar = 0;

foreach (char c in pass_tb_first.Text.ToCharArray())

{

if (Char.IsLower(c))

{

lowerChar++;

}

if (Char.IsUpper(c))

{

upperChar++;

}

if (Char.IsDigit(c))

{

numChar++;

}

if (Char.IsSymbol(c) || Char.IsPunctuation(c) || Char.IsSeparator(c) || Char.IsWhiteSpace(c))

{

otherChar++;

}

}

//长度

if (userPassLen <= 4 && userPassLen!=0)

userPassScore = 5;

if (userPassLen >= 5 && userPassLen <= 7)

userPassScore = 10;

if (userPassLen >= 8)

userPassScore = 25;

if ((lowerChar != 0 || upperChar != 0) && (userPassLen == lowerChar || userPassLen == upperChar))

{

userPassScore += 10;

}

if ((lowerChar != 0 ||upperChar != 0 )&& (userPassLen != lowerChar || userPassLen != upperChar))

{

userPassScore += 20;

}

if (numChar != 0)

{

userPassScore += 10;

if (numChar > 3)

userPassScore += 20;

}

if (otherChar != 0)

{

userPassScore += 10;

if (otherChar > 3)

userPassScore += 25;

}

if (lowerChar != 0 && upperChar != 0 && numChar != 0 && otherChar != 0)

{

userPassScore += 5;

}

if(userPassScore<25)

label5.Text = "非常弱";

if (userPassScore >= 25 && userPassScore < 50)

{

label5.Text = "弱";

label5.ForeColor = System.Drawing.Color.Red;

}

if (userPassScore >= 50 && userPassScore < 60)

{

label5.Text = "一般";

label5.ForeColor = System.Drawing.Color.Blue;

}

if (userPassScore >= 60 && userPassScore < 70)

{

label5.Text = "强";

label5.ForeColor = System.Drawing.Color.YellowGreen;

}

if (userPassScore >= 70 && userPassScore < 80)

{

label5.Text = "非常强";

label5.ForeColor = System.Drawing.Color.LightGreen;

}

if (userPassScore >= 80 && userPassScore < 90)

{

label5.Text = "安全";

label5.ForeColor = System.Drawing.Color.GreenYellow;

}

if (userPassScore >= 90)

{

label5.Text = "非常安全";

label5.ForeColor = System.Drawing.Color.Green;

}

}

private void pass_tb_first_Enter(object sender, EventArgs e)

{

timer1.Enabled = true;

}

private void pass_tb_first_Leave(object sender, EventArgs e)

{

timer1.Enabled = false;

}

}

}

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