using System.Security.Cryptography;
using System.IO;
using System.Text;
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace KingBoy.KBFileCryp
{
/// <summary>
/// 文件加密
/// </summary>
class CrypToFile
{
/// <summary>
/// 将字符串转变成字节数组
/// </summary>
/// <param name="strPWD">字符串</param>
/// <returns>返回字节数组</returns>
private byte[] getByte(string strPWD)
{
try
{
//将字符串转换为字符数组
char[] temp = strPWD.ToCharArray();
byte[] btemp = new byte[16];
int i = 0;
//初始化数组
for (i = 0; i < 16; i++)
btemp[i] = 0;
//根据密码长度，去前16位，后面免去
if (temp.Length < 16) //16位以内密码
for (i = 0; i < temp.Length; i++)
btemp[i] = Convert.ToByte(temp[i]);
else //超过32位密码，自取16位
for (i = 0; i < 16; i++)
btemp[i] = Convert.ToByte(temp[i]);
return btemp;
}
catch (Exception)
{
return null;
}
}
/// <summary>
/// 文件加密
/// </summary>
/// <param name="inName">加密文件路径</param>
/// <param name="outName">加密后文件存放路径</param>
///<param name="strPWD">密码</param>
/// <returns>true表示加密成功，false表示加密失败！</returns>
public bool EncryptData(string inName, string outName,string strPWD)
{
try
{
//判断加密文件是否存在
if (File.Exists(inName) == false)
//加密源文件不存在！
return false;
byte[] rijnKey=getByte(strPWD);
byte[] rijnIV = getByte(strPWD);
//创建加密文件的加密源文件fin和目标文件流fout.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.Create, FileAccess.Write);
fout.SetLength(0);
//创建字节数组变量存储文件读写所需的临时空间
byte []bin = new byte[100];
//定义保存字节写入的总长度变量fdlen
long rdlen = 0;
//定义被加密文件流的长度变量totlen
long totlen = fin.Length;
//定义变量保存在某一时刻写入字节数len.
int len = 0;
//创建加密机制对象
SymmetricAlgorithm rijn = SymmetricAlgorithm.Create();
CryptoStream encStream = new CryptoStream(fout, rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write);
//读取源文件，加密后写入目标文件fout
while (rdlen < totlen)
{
len = fin.Read(bin, 0, 100);
encStream.Write(bin, 0, len);
rdlen =Convert.ToInt32(rdlen + len);
}
encStream.Close();
fout.Close();
fin.Close();
return true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return false;
}
}
/// <summary>
/// 文件解密
/// </summary>
/// <param name="inName">加密文件路径</param>
/// <param name="outName">加密后的文件路径</param>
///<param name="strPWD">密码</param>
/// <returns>true表示解密成功，false表示解密失败！</returns>
public bool DecryptData(string inName, string outName,string strPWD)
{
try
{
//判断解密文件是否存在
if (File.Exists(inName) == false)
//解密源文件不存在！
return false;
byte[] rijnKey =getByte(strPWD);
byte[] rijnIV =getByte(strPWD);
//创建加密文件的加密源文件fin和目标文件流fout.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout = new FileStream(outName, FileMode.Create, FileAccess.Write);
fout.SetLength(0);
//创建字节数组变量存储文件读写所需的临时空间
byte []bin = new byte[100];
//定义保存字节写入的总长度变量fdlen
long rdlen = 0;
//定义被加密文件流的长度变量totlen
long totlen = fin.Length;
//定义变量保存在某一时刻写入字节数len.
int len = 0;
//创建加密机制对象
SymmetricAlgorithm rijn = SymmetricAlgorithm.Create();
CryptoStream encStream = new CryptoStream(fout, rijn.CreateDecryptor(rijnKey, rijnIV), CryptoStreamMode.Write);
//读取源文件，加密后写入目标文件fout
while (rdlen < totlen)
{
len = fin.Read(bin, 0, 100);
encStream.Write(bin, 0, len);
rdlen = Convert.ToInt32(rdlen + len);
}
encStream.Close();
fout.Close();
fin.Close();
return true;
}
catch (Exception)
{
return false;
}
}
/// <summary>
/// 加密指定文件夹中所有文件
/// </summary>
/// <param name="folderPath">指定路径</param>
/// <param name="strPwd">加密密码</param>
public void EncryptFolder(string folderPath,string strPwd)
{
DirectoryInfo di = new DirectoryInfo(folderPath);
if (di.Exists == true) //表示的是目录
{
//获取当前目录下所有子目录
int i = 0;
for (i = 0; i < di.GetDirectories().Length; i++)
{
EncryptFolder(di.GetDirectories()[i].FullName,strPwd);
}
//加密当前文件夹下所有文件
//根据用户选择的路径，获取相关文件集合
FileInfo fi = new FileInfo(folderPath);
FileInfo []files=di.GetFiles();
for (i = 0; i < di.GetFiles().Length; i++)
{
fi = files[i];
if (EncryptData(fi.FullName, fi.FullName.Split('.')[0] + "_pwd." + fi.FullName.Split('.')[1], strPwd) == false)
{
MessageBox.Show("加密失败！");
return;
}
else
{
fi.Delete();
}
}
}
}
/// <summary>
/// 解密指定文件夹中所有文件
/// </summary>
/// <param name="folderPath">指定路径</param>
/// <param name="strPwd">解密密码</param>
public void DecryptFolder(string folderPath, string strPwd)
{
DirectoryInfo di = new DirectoryInfo(folderPath);
if (di.Exists == true) //表示的是目录
{
//获取当前目录下所有子目录
int i = 0;
for (i = 0; i < di.GetDirectories().Length; i++)
{
DecryptFolder(di.GetDirectories()[i].FullName, strPwd);
}
//加密当前文件夹下所有文件
//根据用户选择的路径，获取相关文件集合
FileInfo fi = new FileInfo(folderPath);
FileInfo[] files = di.GetFiles();
for (i = 0; i < di.GetFiles().Length; i++)
{
fi = files[i];
if (DecryptData(fi.FullName, fi.FullName.Split('.')[0].Substring(0, fi.FullName.Split('.')[0].Length - 4) + "." + fi.FullName.Split('.')[1], strPwd) == false)
{
MessageBox.Show("解密失败！");
return;
}
else
{
fi.Delete();
}
}
}
}
}
class CryptoMemoryStream
{
DESCryptoServiceProvider key = new DESCryptoServiceProvider();
// Encrypt the string.
public byte[] Encrypt(string PlainText)
{
// Create a memory stream.
MemoryStream ms = new MemoryStream();
// Create a CryptoStream using the memory stream and the
// CSP DES key.
CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);
// Create a StreamWriter to write a string
// to the stream.
StreamWriter sw = new StreamWriter(encStream);
// Write the plaintext to the stream.
sw.WriteLine(PlainText);
//Close the StreamWriter and CryptoStream.
sw.Close();
encStream.Close();
// Get an array of bytes that represents
// the memory stream.
byte[] buffer = ms.ToArray();
// Close the memory stream.
ms.Close();
// Return the encrypted byte array.
return buffer;
} //Encrypt
// Decrypt the byte array.
public string Decrypt(byte[] CypherText)
{ // Create a memory stream to the passed buffer.
MemoryStream ms = new MemoryStream(CypherText);
// Create a CryptoStream using the memory stream and the
// CSP DES key.
//Dim encStream As New CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);
CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);
// Create a StreamReader for reading the stream.
// Dim sr As New StreamReader(encStream);
StreamReader sr = new StreamReader(encStream);
// Read the stream as a string.
//Dim val As String = sr.ReadLine();
string val = sr.ReadLine();
// Close the streams.
sr.Close();
encStream.Close();
ms.Close();
return val;
}//Decrypt
}//CryptoMemoryStream
}