/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">待加密文件</param>
/// <param name="outFile">加密后输入文件</param>
/// <param name="password">加密密码</param>
public static void EncryptFile(string inFile, string outFile, string password)
{
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
long lSize = fin.Length; // 输入文件长度
int size = (int)lSize;
byte[] bytes = new byte[BUFFER_SIZE]; // 缓存
int read = -1; // 输入文件读取数量
int value = 0;
// 获取IV和salt
byte[] IV = GenerateRandomBytes(16);
byte[] salt = GenerateRandomBytes(16);
// 创建加密对象
SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);
sma.IV = IV;
// 在输出文件开始部分写入IV和salt
fout.Write(IV, 0, IV.Length);
fout.Write(salt, 0, salt.Length);
// 创建散列加密
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
BinaryWriter bw = new BinaryWriter(cout);
bw.Write(lSize);
bw.Write(FC_TAG);
// 读写字节块到加密流缓冲区
while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)
{
cout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
}
// 关闭加密流
chash.Flush();
chash.Close();
// 读取散列
byte[] hash = hasher.Hash;
// 输入文件写入散列
cout.Write(hash, 0, hash.Length);
// 关闭文件流
cout.Flush();
cout.Close();
}
}
}
/// <summary>
/// 输出日志信息到本地日志文件Debug中
/// </summary>
/// <param name="operatorDT">当前操作时间</param>
/// <param name="operators">当前操作人</param>
/// <param name="describe">操作描述</param>
/// <param name="state">操作状态</param>
/// <param name="info">返回信息</param>
/// <returns></returns>
public static void FileLogToLocal(DateTime operatorDT, string operators, string describe, string state, string info)
{
string password = "******";
//string debugPath = System.Windows.Forms.Application.StartupPath;//获取debug文件路径
string UserPath = System.Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData); //获取当前系统登录用户目录
string LogPath = Path.Combine(UserPath, "CmstStorageLog"); //在当前系统登录用户目录下创建CmstStorageLog文件夹
string YearString = DateTime.Now.Year.ToString(); //获取当前年份
string YearPath = Path.Combine(LogPath, YearString + "年");
string MonthString = DateTime.Now.Month.ToString("00"); //获取当前月份
string MonthPath = Path.Combine(YearPath, MonthString + "月");
Directory.CreateDirectory(MonthPath);
File.SetAttributes(MonthPath, FileAttributes.Hidden | FileAttributes.System);//设置Log文件夹隐藏,并设置为系统文件
string nowString = DateTime.Today.ToString("yyyy年MM月dd日");
string logName = nowString + ".txt";
string txtLogPath = Path.Combine(MonthPath, logName); //按当天日期新建TXT文件,保存加密前日志文件
string datName = nowString + ".dat";
string datLogPath = Path.Combine(MonthPath, datName); //按当天日期新建DAT文件，保存加密后日志文件
if (File.Exists(datLogPath))
{
File.SetAttributes(datLogPath, FileAttributes.Normal); //取消文件的特殊属性，进行文件读写
DESFileClass.DecryptFile(datLogPath, txtLogPath, password); //日志文件解密
}
using (StreamWriter sw = new StreamWriter(txtLogPath, true, Encoding.Default))
{
string str = "**********************************************************************\r\n"
+ "操作时间：\r\n" + "\t" + operatorDT.ToString() + "\r\n"
+ "操作人:\r\n" + " \t" + operators + "\r\n"
+ "操作描述:\r\n" + "\t" + describe + "\r\n"
+ "操作状态:\r\n" + "\t" + state + "\r\n"
+ "返回信息:\r\n" + "\t" + info + "\r\n"
+ "**********************************************************************\r\n" + "\r\n";
sw.Write(str);
}
DESFileClass.EncryptFile(txtLogPath, datLogPath, password);
File.SetAttributes(datLogPath, FileAttributes.Hidden | FileAttributes.System | FileAttributes.ReadOnly);//设置日志文件为系统文件，并隐藏，只读
File.Delete(txtLogPath);
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="inFile">待解密文件</param>
/// <param name="outFile">解密后输出文件</param>
/// <param name="password">解密密码</param>
public static void DecryptFile(string inFile, string outFile, string password)
{
// 创建打开文件流
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
int size = (int)fin.Length;
byte[] bytes = new byte[BUFFER_SIZE];
int read = -1;
int value = 0;
int outValue = 0;
byte[] IV = new byte[16];
fin.Read(IV, 0, 16);
byte[] salt = new byte[16];
fin.Read(salt, 0, 16);
SymmetricAlgorithm sma = DESFileClass.CreateRijndael(password, salt);
sma.IV = IV;
value = 32;
long lSize = -1;
// 创建散列对象, 校验文件
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
// 读取文件长度
BinaryReader br = new BinaryReader(cin);
lSize = br.ReadInt64();
ulong tag = br.ReadUInt64();
if (FC_TAG != tag)
{
throw new CryptoHelpException("文件被破坏");
}
long numReads = lSize / BUFFER_SIZE;
long slack = (long)lSize % BUFFER_SIZE;
for (int i = 0; i < numReads; ++i)
{
read = cin.Read(bytes, 0, bytes.Length);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
if (slack > 0)
{
read = cin.Read(bytes, 0, (int)slack);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
chash.Flush();
chash.Close();
fout.Flush();
fout.Close();
byte[] curHash = hasher.Hash;
// 获取比较和旧的散列对象
byte[] oldHash = new byte[hasher.HashSize / 8];
read = cin.Read(oldHash, 0, oldHash.Length);
if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))
{
throw new CryptoHelpException("文件被破坏");
}
}
if (outValue != lSize)
{
throw new CryptoHelpException("文件大小不匹配");
}
}
}
