Add possibility to patch encrypted im4p files if ivkey is present

[krisanovdev]

Hi, I wanna to patch ibss.im4p, I've already decrypted it and patched.
I do not know how to pack it back to encrypted im4p.

[xerub]

you can patch it with -P, there is an example of the patchfile format in the project README.
alternatively, you can decrypt, patch, encrypt using openssl enc -aes-256-cbc -nopad, then put back with img4 -R

[justtryingthingsout]

how do i use img4 -R? i keep getting [e] cannot open 'rawimg.bin' when i do img4 -i rawimg.bin -R out.im4p

[justtryingthingsout]

also img4 -i original.im4p -R rawimg.bin -o out.im4p does nothing, checked with vbindiff and diff

[xerub]

You can't replace the payload in an im4p. im4p is the payload.
What you can do, however, is to replace the payload (aka im4p) inside an img4.
The img4 is a container holding im4p, im4m and (optionally) im4r