App to find correct checksum/key

[RuneinA]

Has anyone told me to find a program that does this:
write some code to decrypt it, fix the save, and encrypt it again
to work out the checksum you would need to write code to test every value from 00 00 to FF FF
to find the correct checksum / key
Does anyone know of a program that does this for pokemon white?


The objective of this is to find the key that allows me to enter the saved game.
Attached the image and topic in relation.
Please someone help me, even if I'm not sure if it's going to work I'll really appreciate it

https://www.pokecommunity.com/threads/494480

 

[RuneinA]

I leave images with what happens both in the game and in pkhex as well as in GEN V save tool when it has or not the checksum

sav with code checksum(1D F5), is detected just like pkhex

sav without the code chekcum(FF FF), is invalid, just like in pkhex