private bool DecryptFile(string inputFile, string outputFile)
{
byte[] srcData = mFileHandle.FileRead(inputFile);
byte[] tmp = new byte[XXTEA_sign.Length];
if (srcData.Length < XXTEA_sign.Length)
{
return(false);
}
Array.Copy(srcData, tmp, XXTEA_sign.Length);
for (int i = 0; i < XXTEA_sign.Length; i++)
{
if (tmp[i] != XXTEA_sign[i])
{
richTextBox_log.AppendText("签名错误--->" + inputFile + "\n");
return(false);
}
}
//此处需要去掉文件头的签名值并重新计算数据长度
uint ret_length;
int len = srcData.Length - XXTEA_sign.Length;
byte[] data = new byte[len];
Buffer.BlockCopy(srcData, XXTEA_sign.Length, data, 0, len);
byte[] data2 = mXXTEAHelp.xxtea_decrypt(data, (uint)len, XXTEA_KEY, (uint)XXTEA_KEY.Length, out ret_length);
if (mFileHandle.FileWrite(data2, outputFile))
{
return(true);
}
return(false);
}