I've been wanting to make a pkg tool for a while to use in other projects and have about everything I need. I can decrypt, extract, repack and encrypt a pkg file using the original header. What I'm having trouble with is making a header for a new pkg I don't understand how to get bytes 0x60 - 0x80. I've been trying to read the wiki and python code but I'm not getting very far at it. If anyone can point me to something to study up on or explain it to me I'd be really grateful.