RE_MSG_proc.1sc

//------------------------------------------------
//--- 010 Editor v13.0 Script File
//
//      File: .msg.*
//   Authors: dtlnor (Thanks to wwylele's mhrice and ponaromixxx's msg tool)
//   Version: 1.1.0
//   Purpose: decrypt or encrypt the msg file. (for version <= 12, it seems its not encrypted)
//  Category: 
//   History: 
//------------------------------------------------

local int i, j = 0;

local ubyte key[16] = {
0xCF, 0xCE, 0xFB, 0xF8, 0xEC, 0x0A, 0x33, 0x66,
0x93, 0xA9, 0x1D, 0x93, 0x50, 0x39, 0x5F, 0x09};


void decrypt(){
    local ubyte prev, cur = 0;
    local ubyte buffer[EntryContents.dataSize];
    for (i = 0; i < EntryContents.dataSize; i++) {
        cur = EntryContents.dataStream[i];
        buffer[i] = cur ^ prev ^ key[i & 0xF];
        prev = cur;
    }
    WriteBytes(buffer, Header.dataOffset, EntryContents.dataSize);
}

void encrypt(){
    local ubyte prev, cur = 0;
    local ubyte buffer[EntryContents.dataSize];
    for (i = 0; i < EntryContents.dataSize; i++) {
        prev = EntryContents.dataStream[i];
        buffer[i] = cur ^ prev ^ key[i & 0xF];
        cur = buffer[i];
    }
    WriteBytes(buffer, Header.dataOffset, EntryContents.dataSize);
}

// This will take several seconds when your file size larger than 1MB.
// You should wait til "Script executed successfully." shown on the output panel before you do anything else.
// remember to encrypt back after you finish editing or else.
decrypt();
//encrypt();