使用DESCryptoServiceProvider类对数据或者文件进行加密解密

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Security.Cryptography;

using System.IO;

using System.Text;

namespace CommonFunction

{

/// <summary>

/// secret 的摘要说明。

/// </summary>

public partial class secrettest : System.Web.UI.Page

{

protected string txtFilePath,fileExtName;

Secret jiami = new Secret();

protected void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

}

Web Form Designer generated code

protected void btnJia_Click(object sender, System.EventArgs e)

{

txtNew.Text = jiami.DesEncrypt(txtValue.Text,"songxiud");

}

protected void btnJie_Click(object sender, System.EventArgs e)

{

txtValue.Text = jiami.DesDecrypt(txtNew.Text.Trim(),"songxiud");

}

protected void btnOpen_Click(object sender, System.EventArgs e)

{

if(filePath.PostedFile.FileName != "")

{

txtFilePath =filePath.PostedFile.FileName;

fileExtName = txtFilePath.Substring(txtFilePath.LastIndexOf(".")+1,3);

if(fileExtName !="txt" && fileExtName != "TXT")

{

Response.Write("请选择文本文件");

}

else

{

StreamReader fileStream = new StreamReader(txtFilePath,Encoding.Default);

txtContent.Text = fileStream.ReadToEnd();

fileStream.Close();

}

protected void btnFile_Click(object sender, System.EventArgs e)

{

jiami.DesEncrypt(Server.MapPath("txtFile")+"\\work.txt",Server.MapPath("txtFile")+"\\work1.txt","songxiud");

StreamReader fileStream = new StreamReader(Server.MapPath("txtFile")+"\\work1.txt",Encoding.Default);

txtContent.Text = fileStream.ReadToEnd();

fileStream.Close();

}

protected void btnFileDes_Click(object sender, System.EventArgs e)

{

jiami.DesDecrypt(Server.MapPath("txtFile")+"\\work1.txt",Server.MapPath("txtFile")+"\\workjie.txt","songxiud");

StreamReader fileStream = new StreamReader(Server.MapPath("txtFile")+"\\workjie.txt",Encoding.Default);

txtContent.Text = fileStream.ReadToEnd();

fileStream.Close();

}

<%@ Page language="c#" Inherits="CommonFunction.secrettest" CodeFile="secret.aspx.cs" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>secret</title>

</HEAD>

<asp:textbox id="txtValue" style="Z-INDEX: 101; LEFT: 168px; POSITION: absolute; TOP: 72px" runat="server"></asp:textbox><asp:button id="btnJia" style="Z-INDEX: 102; LEFT: 344px; POSITION: absolute; TOP: 72px" runat="server"

Text="数据加密" onclick="btnJia_Click"></asp:button><asp:button id="btnJie" style="Z-INDEX: 103; LEFT: 344px; POSITION: absolute; TOP: 104px" runat="server"

Text="数据解密" onclick="btnJie_Click"></asp:button><asp:textbox id="txtNew" style="Z-INDEX: 104; LEFT: 168px; POSITION: absolute; TOP: 112px" runat="server"></asp:textbox><asp:textbox id="txtContent" style="Z-INDEX: 105; LEFT: 168px; POSITION: absolute; TOP: 160px"

runat="server" Width="200px" Height="296px" TextMode="MultiLine"></asp:textbox><asp:button id="btnFile" style="Z-INDEX: 106; LEFT: 408px; POSITION: absolute; TOP: 312px" runat="server"

Text="文件加密" onclick="btnFile_Click"></asp:button><asp:button id="btnFileDes" style="Z-INDEX: 107; LEFT: 408px; POSITION: absolute; TOP: 384px"

runat="server" Text="文件解密" onclick="btnFileDes_Click"></asp:button><INPUT id="filePath" style="Z-INDEX: 108; LEFT: 408px; POSITION: absolute; TOP: 160px"

type="file" name="File1" runat="server">

<asp:button id="btnOpen" style="Z-INDEX: 109; LEFT: 408px; POSITION: absolute; TOP: 240px" runat="server"

Text="打开文件" onclick="btnOpen_Click"></asp:button>

<asp:Label id="Label1" style="Z-INDEX: 110; LEFT: 168px; POSITION: absolute; TOP: 32px" runat="server">该示例以txtFile文件夹下的Work.txt文件为例</asp:Label></FONT></form>

</body>

</HTML>

using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

namespace CommonFunction

{

/// <summary>

///数据加密、解密，文件的加密解密

/// </summary>

public class Secret

{

public Secret()

{

// TODO: 在此处添加构造函数逻辑

}

public string DesEncrypt(string strText, string strEncrKey)

{

byte[] byKey=null;

byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,strEncrKey.Length));

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ;

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

return Convert.ToBase64String(ms.ToArray());

}

catch(System.Exception error)

{

return "error:" +error.Message+"\r";

}

public string DesDecrypt(string strText,string sDecrKey)

{

byte[] byKey = null;

byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

byte[] inputByteArray = new Byte[strText.Length];

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8));

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

inputByteArray = Convert.FromBase64String(strText);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

System.Text.Encoding encoding = new System.Text.UTF8Encoding();

return encoding.GetString(ms.ToArray());

}

catch(System.Exception error)

{

return "error:"+error.Message+"\r";

}

public void DesEncrypt(string m_InFilePath,string m_OutFilePath,string strEncrKey)

{

byte[] byKey=null;

byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8));

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

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

fout.SetLength(0);

byte[] bin = new byte[100];

long rdlen = 0;

long totlen = fin.Length;

int len;

DES des = new DESCryptoServiceProvider();

CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);

while(rdlen < totlen)

{

len = fin.Read(bin, 0, 100);

encStream.Write(bin, 0, len);

rdlen = rdlen + len;

}

encStream.Close();

fout.Close();

fin.Close();

}

catch

{

}

public void DesDecrypt(string m_InFilePath,string m_OutFilePath,string sDecrKey)

{

byte[] byKey = null;

byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8));

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

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

fout.SetLength(0);

byte[] bin = new byte[100];

long rdlen = 0;

long totlen = fin.Length;

int len;

DES des = new DESCryptoServiceProvider();

CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

while(rdlen < totlen)

{

len = fin.Read(bin, 0, 100);

encStream.Write(bin, 0, len);

rdlen = rdlen + len;

}

encStream.Close();

fout.Close();

fin.Close();

}

catch

{

}

public string MD5Encrypt(string strText)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strText));

return System.Text.Encoding.Default.GetString(result);

}

public string MD5Decrypt(string strText)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] result = md5.TransformFinalBlock(System.Text.Encoding.Default.GetBytes(strText),0,strText.Length);

return System.Text.Encoding.Default.GetString(result);

}

posted on 2006-12-28 17:11 Caviare 阅读(1380) 评论(1) 编辑收藏举报