using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Cryptography;
/*----------------------------------------------
* DES加密、解密类库，字符串加密结果使用BASE64编码返回，支持文件的加密和解密
* 作者： Leo.wl
* ---------------------------------------------
*/
namespace ZU14{
public sealed class DES
{
string iv = "1234的yzo";
string key = "123在yzo";
/// <summary>
/// DES加密偏移量，必须是>=8位长的字符串
/// </summary>
public string IV
{
get { return iv; }
set { iv = value; }
}
/// <summary>
/// DES加密的私钥，必须是8位长的字符串
/// </summary>
public string Key
{
get { return key; }
set { key = value; }
}
/// <summary>
/// 对字符串进行DES加密
/// </summary>
/// <param name="sourceString">待加密的字符串</param>
/// <returns>加密后的BASE64编码的字符串</returns>
public string Encrypt(string sourceString)
{
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
byte[] inData = Encoding.Default.GetBytes(sourceString);
try
{
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(inData, 0, inData.Length);
cs.FlushFinalBlock();
}
return Convert.ToBase64String(ms.ToArray());
}
catch{ throw;}
}
}
/// <summary>
/// 对DES加密后的字符串进行解密
/// </summary>
/// <param name="encryptedString">待解密的字符串</param>
/// <returns>解密后的字符串</returns>
public string Decrypt(string encryptedString)
{
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
byte[] inData = Convert.FromBase64String(encryptedString);
try {
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(inData, 0, inData.Length);
cs.FlushFinalBlock();
}
return Encoding.Default.GetString(ms.ToArray());
}
catch
{ throw; }
}
}
/// <summary>
/// 对文件内容进行DES加密
/// </summary>
/// <param name="sourceFile">待加密的文件绝对路径</param>
/// <param name="destFile">加密后的文件保存的绝对路径</param>
public void EncryptFile(string sourceFile, string destFile)
{
if (!File.Exists(sourceFile))
throw new FileNotFoundException("指定的文件路径不存在！", sourceFile);
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] btFile = File.ReadAllBytes(sourceFile);
using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))
{
try
{
using (CryptoStream cs = new CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(btFile, 0, btFile.Length);
cs.FlushFinalBlock();
}
}catch { throw; }
finally { fs.Close(); }
} }
/// <summary>
/// 对文件内容进行DES加密，加密后覆盖掉原来的文件
/// </summary>
/// <param name="sourceFile">待加密的文件的绝对路径</param>
public void EncryptFile(string sourceFile)
{
EncryptFile(sourceFile, sourceFile);
}
/// <summary>
/// 对文件内容进行DES解密
/// </summary>
/// <param name="sourceFile">待解密的文件绝对路径</param>
/// <param name="destFile">解密后的文件保存的绝对路径</param>
public void DecryptFile(string sourceFile, string destFile)
{
if (!File.Exists(sourceFile))
throw new FileNotFoundException("指定的文件路径不存在！", sourceFile);
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] btFile = File.ReadAllBytes(sourceFile);
using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))
{ try
{
using (CryptoStream cs = new CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
{ cs.Write(btFile, 0, btFile.Length);
cs.FlushFinalBlock();
} }
catch
{ throw; }
finally
{ fs.Close(); } } }
/// <summary>
/// 对文件内容进行DES解密，加密后覆盖掉原来的文件
/// </summary>
/// <param name="sourceFile">待解密的文件的绝对路径</param>
public void DecryptFile(string sourceFile)
{ DecryptFile(sourceFile, sourceFile); }
}}
使用实例：
ZU14.DES des = new ZU14.DES();des.IV = "abcd哈哈笑";des.Key = "必须八位";string es = des.Encrypt("在");Console.WriteLine(es);Console.Write(des.Decrypt(es));des.EncryptFile(@"d:\a.txt", @"d:\b.txt");des.DecryptFile(@"d:\b.txt");Console.ReadKey(true);
代码
