using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
Namespace CommonFunctionnamespace CommonFunction
{
/// <summary>
///数据加密、解密，文件的加密解密
/// </summary>
public Class Secretclass 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);
}
}
}
实例：
Secret jiami = new Secret();
加密
private void btnJia_Click(object sender, System.EventArgs e)
{
txtNew.Text = jiami.DesEncrypt(txtValue.Text,"songxiud");
}
解密
private void btnJie_Click(object sender, System.EventArgs e)
{
txtValue.Text = jiami.DesDecrypt(txtNew.Text.Trim(),"songxiud");
}
打开文件
private 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();
}
}
}
对文件内容加密
private 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();
}
对加密文件内容解密
private 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();
}
注意：在该示例中，文件加密使用的是txtFile目录下的work.txt文件为例,File控件主要是用来方面您察看加密后的文件。