Perry Rhodan encoded ? Jpegs

[Itze]

Hi, i've been trying to display the textures from the new Perry Rhodan adventure game but they seem to be encoded somehow

i have attached the head texture of perry(atleast i think so )

maybe someone can figure out how to make it viewable again

[john_doe]

Hi,

I've made a little tool which decrypts the file you sent. Please tell me if it works with other files, too.

You can download it from http://gamefileformats.the-underdogs.in ... tperry.zip

[Rheini]

Care to share the algo?

[john_doe]

Of course:

Code: Select all

void decryptData(byte *data, uint32 size) {
    byte xorValues[3] = {0x42, 0x99, 0x80};
    for (uint32 ofs = 0; ofs < size; ofs++) {
        uint32 value = ofs % 3;
        data[ofs] ^= xorValues[value] - 0x6E;
    }
}

[Itze]

thanks john_doe

works fine, i tried a few different files(128x128 up to 1024x1024) and it converted them properly

would it be possible to convert them back with a simple tool too?

i saw the algo but unfortunately im no programmar and have no idea how it works

[Rheini]

Try using the same program. It might work.

[Itze]

lol yeah it does...
thanks

[Rheini]

btw this works because the algorithm uses XOR.

[mambox]

I dont know how good is the game but look great!

another xoring,congrats to john.

btw how did you reverse the xoring method,analysis of file or reversing exe?

[kurt28]

Hi,

I've made a little tool which decrypts the file you sent. Please tell me if it works with other files, too.

You can download it from http://gamefileformats.the-underdogs.in ... tperry.zip

Please, can you upload the file again?

Thanks.

[john_doe]

Of course, I hope I can still find it somewhere...

[john_doe]

I found it and upload the tool here:
http://www.xentax.com/uploads/author/jo ... tperry.zip

[kurt28]

Thank you very much.