Metal Gear Solid V: Ground Zeroes

"
Security:
-> Custom Encryption
-> MD5
   -> Offset: 0
   -> Calculation Start: 16
   -> Calculation Length: Size - 16

Additional:
The same function is used to de/encrypt the save.
MD5 hash is stored at the beginning of the decrypted data.
"

private byte[] EncData(byte[] source) {
    uint next = 0x2E789090;
    using (var src = new MasterIO(source)) {
        using (var res = new MasterIO()) {
            for (int i = 0; i < source.Length >> 2; ++i) {
                next ^= (next << 13);
                next ^= (next >> 7);
                next ^= (next << 5);
                res.Writer.WriteUInt32(src.Reader.ReadUInt32() ^ next);
            }
            return res.Buffer;
        }
    }
}