public static void DecryptFile(string encryptedFilePath, string decryptedFilePath, byte[] key, byte[] iv, long lOrgFileSize)
{
if (File.Exists(decryptedFilePath))
{
File.Delete(decryptedFilePath);
}
long length = new FileInfo(encryptedFilePath).Length;
long num1 = (long)(int)(length / (long)Encipher.chunkSize + 1L);
bool flag = true;
try
{
for (long index = 0; index < num1; ++index)
{
int readCount;
byte[] bytesFromFile = Encipher.GetBytesFromFile(encryptedFilePath, (long)Encipher.headerSize + index * (long)Encipher.chunkSize, out readCount);
if (readCount > 0)
{
byte[] cipherText = new byte[readCount];
Buffer.BlockCopy((Array)bytesFromFile, 0, (Array)cipherText, 0, readCount);
byte[] _ByteArray = Encipher.DecryptStringFromBytes(cipherText, key, iv, readCount);
flag = Encipher.WriteBytesToFile(decryptedFilePath, _ByteArray);
if (!flag)
{
break;
}
}
}
if (!flag)
{
return;
}
long num2 = length - (long)Encipher.headerSize - lOrgFileSize;
FileInfo fileInfo = new FileInfo(decryptedFilePath);
FileStream fileStream = fileInfo.Open(FileMode.Open);
fileStream.SetLength(Math.Max(0L, fileInfo.Length - num2));
fileStream.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
public static void DecryptFile(string encryptedFilePath, string decryptedFilePath, byte[] key, byte[] iv, long lOrgFileSize)
{
int num;
if (File.Exists(decryptedFilePath))
{
File.Delete(decryptedFilePath);
}
long length = (new FileInfo(encryptedFilePath)).Length;
long num1 = (long)((int)(length / (long)Encipher.chunkSize + (long)1));
bool file = true;
try
{
for (long i = (long)0; i < num1; i = i + (long)1)
{
byte[] bytesFromFile = Encipher.GetBytesFromFile(encryptedFilePath, (long)Encipher.headerSize + i * (long)Encipher.chunkSize, out num);
if (num > 0)
{
byte[] numArray = new byte[num];
Buffer.BlockCopy(bytesFromFile, 0, numArray, 0, num);
byte[] numArray1 = Encipher.DecryptStringFromBytes(numArray, key, iv, num);
file = Encipher.WriteBytesToFile(decryptedFilePath, numArray1);
if (!file)
{
break;
}
}
}
if (file)
{
long num2 = length - (long)Encipher.headerSize - lOrgFileSize;
FileInfo fileInfo = new FileInfo(decryptedFilePath);
FileStream fileStream = fileInfo.Open(FileMode.Open);
fileStream.SetLength(Math.Max((long)0, fileInfo.Length - num2));
fileStream.Close();
}
}
catch (Exception exception)
{
}
}
