.net加密技术的应用(加密类代码参考)
using System;
using System.Text;
using System.Security;
using System.Security.Cryptography;
using System.IO;
namespace EncryptClasses
{
/// <summary>
/// 此处定义的是DES加密,为了便于今后的管理和维护
/// 请不要随便改动密码,或者改变了密码后请一定要
/// 牢记先前的密码,否则将会照成不可预料的损失
/// </summary>
public class DESEncrypt
{
#region "member fields"
private string iv="12345678";
private string key="12345678";
private Encoding encoding=new UnicodeEncoding();
private DES des;
#endregion
/// <summary>
/// 构造函数
/// </summary>
public DESEncrypt()
{
des=new DESCryptoServiceProvider();
}
#region "propertys"
/// <summary>
/// 设置加密密钥
/// </summary>
public string EncryptKey
{
get{return this.key;}
set
{
this.key=value;
}
}
/// <summary>
/// 要加密字符的编码模式
/// </summary>
public Encoding EncodingMode
{
get{return this.encoding;}
set{this.encoding=value;}
}
#endregion
#region "methods"
/// <summary>
/// 加密字符串并返回加密后的结果
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public string EncryptString(string str)
{
byte[] ivb=Encoding.ASCII.GetBytes(this.iv);
byte[] keyb=Encoding.ASCII.GetBytes(this.EncryptKey);//得到加密密钥
byte[] toEncrypt=this.EncodingMode.GetBytes(str);//得到要加密的内容
byte[] encrypted;
ICryptoTransform encryptor=des.CreateEncryptor(keyb,ivb);
MemoryStream msEncrypt=new MemoryStream();
CryptoStream csEncrypt=new CryptoStream(msEncrypt,encryptor,CryptoStreamMode.Write);
csEncrypt.Write(toEncrypt,0,toEncrypt.Length);
csEncrypt.FlushFinalBlock();
encrypted=msEncrypt.ToArray();
csEncrypt.Close();
msEncrypt.Close();
return this.EncodingMode.GetString(encrypted);
}
/// <summary>
/// 加密指定的文件,如果成功返回True,否则false
/// </summary>
/// <param name="filePath">要加密的文件路径</param>
/// <param name="outPath">加密后的文件输出路径</param>
public void EncryptFile(string filePath,string outPath)
{
bool isExist=File.Exists(filePath);
if(isExist)//如果存在
{
byte[] ivb=Encoding.ASCII.GetBytes(this.iv);
byte[] keyb=Encoding.ASCII.GetBytes(this.EncryptKey);
//得到要加密文件的字节流
FileStream fin=new FileStream(filePath,FileMode.Open,FileAccess.Read);
StreamReader reader=new StreamReader(fin,this.EncodingMode);
string dataStr=reader.ReadToEnd();
byte[] toEncrypt=this.EncodingMode.GetBytes(dataStr);
fin.Close();FileStream fout=new FileStream(outPath,FileMode.Create,FileAccess.Write);
ICryptoTransform encryptor=des.CreateEncryptor(keyb,ivb);
CryptoStream csEncrypt=new CryptoStream(fout,encryptor,CryptoStreamMode.Write);
try
{
//加密得到的文件字节流
csEncrypt.Write(toEncrypt,0,toEncrypt.Length);
csEncrypt.FlushFinalBlock();
}
catch(Exception err)
{
throw new ApplicationException(err.Message);
}
finally
{
try
{
fout.Close();
csEncrypt.Close();
}
catch
{
;
}
}
}
else
{
throw new FileNotFoundException("没有找到指定的文件");
}
}
/// <summary>
/// 文件加密函数的重载版本,如果不指定输出路径,
/// 那么原来的文件将被加密后的文件覆盖
/// </summary>
/// <param name="filePath"></param>
public void EncryptFile(string filePath)
{
this.EncryptFile(filePath,filePath);
}
/// <summary>
/// 解密给定的字符串
/// </summary>
/// <param name="str">要解密的字符</param>
/// <returns></returns>
public string DecryptString(string str)
{
byte[] ivb=Encoding.ASCII.GetBytes(this.iv);
byte[] keyb=Encoding.ASCII.GetBytes(this.EncryptKey);
byte[] toDecrypt=this.EncodingMode.GetBytes(str);
byte[] deCrypted=new byte[toDecrypt.Length];
ICryptoTransform deCryptor=des.CreateDecryptor(keyb,ivb);
MemoryStream msDecrypt=new MemoryStream(toDecrypt);
CryptoStream csDecrypt=new CryptoStream(msDecrypt,deCryptor,CryptoStreamMode.Read);
try
{
csDecrypt.Read(deCrypted,0,deCrypted.Length);
}
catch(Exception err)
{
throw new ApplicationException(err.Message);
}
finally
{
try
{
msDecrypt.Close();
csDecrypt.Close();
}
catch{;}
}
return this.EncodingMode.GetString(deCrypted);
}
/// <summary>
/// 解密指定的文件
/// </summary>
/// <param name="filePath">要解密的文件路径</param>
/// <param name="outPath">解密后的文件输出路径</param>
public void DecryptFile(string filePath,string outPath)
{
bool isExist=File.Exists(filePath);
if(isExist)//如果存在
{
byte[] ivb=Encoding.ASCII.GetBytes(this.iv);
byte[] keyb=Encoding.ASCII.GetBytes(this.EncryptKey);
FileInfo file=new FileInfo(filePath);
byte[] deCrypted=new byte[file.Length];
补充：综合编程 , 安全编程 ,
