public static void DecryptFile(string filePath, EncVersion encVersion)
{
byte[] fileBytes;
switch (Save.GetFileType(filePath))
{
case ENC_TYPE.JPGorPNG:
using (var fileStream = File.OpenWrite(Save.GetSavePath(filePath)))
{
fileBytes = Crypt.Decrypt(File.ReadAllBytes(filePath), false, encVersion);
fileStream.Write(fileBytes, 0, fileBytes.Length);
fileStream.Close();
}
break;
case ENC_TYPE.TXTorSQLorJSON:
using (var streamWriter = new StreamWriter(Save.GetSavePath(filePath)))
{
fileBytes = Crypt.Decrypt(File.ReadAllBytes(filePath), true, encVersion);
var fileText = Encoding.UTF8.GetString(fileBytes).Replace("\r", "");
streamWriter.Write(fileText);
streamWriter.Close();
}
break;
case ENC_TYPE.BIN:
using (var streamWriter = new StreamWriter(Save.GetSavePath(filePath)))
{
fileBytes = Crypt.Decrypt(File.ReadAllBytes(filePath), false, encVersion);
var fileText = Encoding.UTF8.GetString(fileBytes);
streamWriter.Write(fileText);
streamWriter.Close();
}
break;
case ENC_TYPE.UNKONWN:
using (var fileStream = File.OpenWrite(Save.GetSavePath(filePath)))
{
fileBytes = Crypt.Decrypt(File.ReadAllBytes(filePath), false, encVersion);
fileStream.Write(fileBytes, 0, fileBytes.Length);
fileStream.Close();
}
break;
case ENC_TYPE.ERROR:
MessageBox.Show(@"无法识别");
break;
case ENC_TYPE.ACB:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
public static string ConvertFileName(string filePath, EncVersion versionFrom, EncVersion versionTo)
{
if (versionFrom == versionTo)
{
return(null);
}
//var fileBytes = File.ReadAllBytes(filePath);
//var nowBytes = Decrypt(fileBytes, true, EncVersion.Ver2);
//using (var fileStream = File.OpenWrite(Save.GetSavePath(filePath)))
//{
// fileStream.Write(nowBytes, 0, nowBytes.Length);
// fileStream.Close();
//}
if (versionFrom == EncVersion.Ver1)
{
var fileName = Path.GetFileNameWithoutExtension(filePath);
var fileNameWithoutExrension = Path.GetFileNameWithoutExtension(fileName);
var fileExtension = Path.GetExtension(fileName);
var fileNameBytes = Encoding.UTF8.GetBytes(fileNameWithoutExrension ?? " ");
var hashBytes = HmacSha256.ComputeHash(fileNameBytes);
var fileHash = BitConverter.ToString(hashBytes, 0, hashBytes.Length).Replace("-", "");
return($"{fileNameWithoutExrension}_{fileHash}{fileExtension}.enc");
}
else
{
var fileName = Path.GetFileNameWithoutExtension(filePath);
var fileExtension = Path.GetExtension(fileName);
if (fileName == null)
{
return(null);
}
var tempFileName = fileName.Split('_');
var exportFileName = string.Join("_", tempFileName.Take(tempFileName.Length - 1));
return(exportFileName + fileExtension + ".enc");
}
}
public static byte[] Decrypt <T>(T data, bool lz4 = false, EncVersion encVersion = EncVersion.Ver1)
{
if (data == null)
{
return(null);
}
var fileSigSize = SIGNATURE_SIZE; //"t7s-enc",size =7;
if (encVersion == EncVersion.Ver1)
{
fileSigSize = 0;
}
var array = new byte[16];
var array2 = ConvertByte(data); //文件数据转换为数组
if (array2.Length <= (16 | fileSigSize))
{
return(null);
}
var array3 = new byte[array2.Length - fileSigSize - 16]; //文件数组 - 文件头(16) - 文件标签(7)
Buffer.BlockCopy(array2, fileSigSize, array, 0, 16);
Buffer.BlockCopy(array2, fileSigSize | 16, array3, 0, array2.Length - fileSigSize - 16);
byte[] array4;
if (encVersion == EncVersion.Ver1)
{
using (var rhinelandManaged = new RijndaelManaged())
{
rhinelandManaged.BlockSize = 128;
rhinelandManaged.KeySize = 128;
rhinelandManaged.IV = array;
rhinelandManaged.Key = PrivateKey;
rhinelandManaged.Mode = CipherMode.CBC;
rhinelandManaged.Padding = PaddingMode.PKCS7;
using (var cryptoTransform = rhinelandManaged.CreateDecryptor())
{
array4 = cryptoTransform.TransformFinalBlock(array3, 0, array3.Length);
}
}
}
else
{
SetShuffledKey(PrivateKey2);
using (var rhinelandManaged = new RijndaelManaged())
{
rhinelandManaged.BlockSize = 128;
rhinelandManaged.KeySize = 128;
rhinelandManaged.IV = array;
rhinelandManaged.Key = _shuffledKey;
rhinelandManaged.Mode = CipherMode.CBC;
rhinelandManaged.Padding = PaddingMode.PKCS7;
using (var cryptoTransform = rhinelandManaged.CreateDecryptor())
{
array4 = cryptoTransform.TransformFinalBlock(array3, 0, array3.Length);
}
}
ClearShuffledKey();
}
return(!lz4 ? array4 : LZ4Codec.Decode(array4, 4, array4.Length - 4, BitConverter.ToInt32(array4, 0)));
}
