View difference between Paste ID: E7MVmDBh and qa7fRjQi

-'Security:
+"
 Security:
 -> Custom SHA1
    -> Offset: 8
    -> Calculation Start: 32
    -> Calculation Length: See Code
 
 Additional:
 The SHA1 hash is moved to a buffer with the size of 24 bytes.
 After that the 3 UInt64 parts of the buffer are combined using XOR.
---- --- --- --- --- --- --- --- --- ---'
+"
 
 byte[] data = File.ReadAllBytes(fileName);
 
 using (var r = new Reader(data, Endian.BIG)) {
     r.Position = 24;
     int cLen = r.ReadInt32() + r.ReadInt32() - 32;
 
     byte[] hash = new byte[24];
     using (var sha = new SHA1Managed()) {
         sha.TransformFinalBlock(data, 32, cLen);
         Buffer.BlockCopy(sha.Hash, 0, hash, 0, 20);
     }
 
     long checksum = 0;
     fixed (byte* x = hash) {
         long* hashP = (long*) x;
         for (int i = 0; i < 3; ++i, ++hashP)
             checksum ^= *hashP;
     }
 }