public virtual void AES256IGEDecrypt(string sourceFile, string destFile, byte[] iv, byte[] key)
{
int num1;
File file = new File(sourceFile);
File file2 = new File(destFile);
AESFastEngine engine = new AESFastEngine();
engine.init(false, new KeyParameter(key));
byte[] buffer = CryptoUtils.substring(iv, 0x10, 0x10);
byte[] buffer2 = CryptoUtils.substring(iv, 0, 0x10);
BufferedInputStream.__ <clinit>();
BufferedInputStream stream = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream stream2 = new BufferedOutputStream(new FileOutputStream(file2));
byte[] buffer3 = new byte[0x10];
Label_0060:
num1 = stream.read(buffer3);
if (num1 <= 0)
{
stream2.flush();
stream2.close();
stream.close();
}
else
{
byte[] @in = new byte[0x10];
int index = 0;
while (true)
{
if (index >= 0x10)
{
break;
}
@in[index] = (byte)((sbyte)(buffer3[index] ^ buffer[index]));
index++;
}
engine.processBlock(@in, 0, @in, 0);
index = 0;
while (true)
{
if (index >= 0x10)
{
break;
}
@in[index] = (byte)((sbyte)(@in[index] ^ buffer2[index]));
index++;
}
buffer2 = buffer3;
buffer = @in;
buffer3 = new byte[0x10];
stream2.write(@in);
goto Label_0060;
}
}