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  1. #1
    h4x0r
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    [Java] Cosmic Break KAR Encryption / Decryption Algo

    Victim

    Here extracted and decrypted java class files from executable. Some general parts decompiled.

    Maybe some one who understand JAVA programming language make packer / unpacker for KAR archives

    Please register or login to download attachments.

    Last edited by h4x0r; 2012-08-14 at 07:20 AM.

  2. #2
    toptaran
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    I be able to compile tool, but can't check, need password. Kar files crypted with key maked from password.
    Code:
    	  CryptKey(String key) // key = password
    	  {
    		long hash = 0L;
    		for (int i = 0; i < key.length(); i++) {
    		  hash = 31L * hash + key.charAt(i);
    		}
    		setSeed(hash);
    	  }

  3. #3
    xTsukihime
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    lol wanted to see this since it wasn't posted on xentax directly but I guess I have to wait until my account's out of lurker mode
    I develop noesis plugins using the Sanae3D interface I wrote. If a plugin says Sanae3D is missing, just download it and put it in your plugins folder. Since signatures do not allow URL tags you can visit my profile to get the link to my website which contains a link to the Sanae3D package.

    But I'm usually on xentax.

  4. #4
    h4x0r
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    Updated source's. Try pwd
    Code:
    dhfuhsudfh98vhdsovnfdhiouer8u8hgjbkjciudsuifsjdiosajfn
    Last edited by h4x0r; 2012-08-14 at 07:21 AM.

  5. #5
    toptaran
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    Are you sure it's source of current kar format?

    I founded some differences in header. Here is right:
    void readExternal(DataInput in)
    throws IOException, ClassNotFoundException
    {
    in.readByte(); // not known, not present in default
    if(in.readBoolean())
    password = in.readUTF();
    timestamp = in.readLong();
    in.readByte(); // not known, not present in default
    String deflatet = in.readUTF(); // was byte
    deflate = Integer.parseInt(deflatet.substring(deflatet.index Of("=") + 1, deflatet.length() - 1)) <= 0 ? false : true;
    One more interesting thing:
    password digest stored in kar(password = in.readUTF() has 29 symbols "8612427997cc3b484346c73f11bba", but must be 32, coz it's md5.

    Password do not match if nothing changed, password need to decrypt files. For headers is no need.

    Some files from image.kar:
    /arena/cg_loadingstg1_poyeen05.png
    /arena/cg_room1img_a00_01.png
    /mate/cg_mate2_B_angry.png
    /arena/cg_loadingstg1_black02.png
    /arena/cg_loadingstg1_event004.png
    /other/ic_planet_flowy.png
    /loading/loading_001.png

  6. #6
    h4x0r
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    Quote Originally Posted by toptaran View Post
    Are you sure it's source of current kar format?
    Java classes from latest version client.

    Quote Originally Posted by toptaran View Post
    password digest stored in kar(password = in.readUTF() has 29 symbols "8612427997cc3b484346c73f11bba", but must be 32, coz it's md5.
    No ideas

    btw: This game used too KAR
    Last edited by h4x0r; 2012-08-14 at 03:38 PM.

  7. #7
    toptaran
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    Here you are version can list files and extract one of files.

    If we will found password or what's wrong i rewrite it.

    Please register or login to download attachments.


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  9. #8
    h4x0r
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    Good. I check it later
    Last edited by h4x0r; 2012-08-14 at 05:28 PM.

  10. #9
    toptaran
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    Haha, there are two KarSource files, one of them only to confuse us.
    For example right entry structure:
    void readExternal(DataInput in) throws IOException, ClassNotFoundException
    {
    in.readShort();
    password = in.readUTF();
    timestamp = in.readLong();
    int b = in.readByte();
    if (b > 0) {
    String ext = in.readUTF();
    int i = ext.indexOf("deflate=");
    if (i >= 0) {
    String ls = ext.substring(i);
    i = ls.indexOf(",");
    if (i >= 0) {
    ls = ls.substring("deflate=".length(), i);
    deflevel = Integer.parseInt(ls);
    }
    deflater = new Deflater(deflevel);
    }

    }

  11. #10
    h4x0r
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    Rewrite unpacker

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