# Reversing : Keygenme
## Description Can you get the flag?
## Solve Running through the code in ghidra I was able to locate the comparison its doing with the provided user key and the expected characteristics about the key comparison.
The key is expected to be 36 chars long 
![strlen](https://raw.githubusercontent.com/elemental-unicorn/picoctf-2022/master/reverse_eng/keygenme/.img/strlen_expected.png)
The key starts with `picoCTF{br1ng_y0ur_0wn_k3y_` and ends with `}` leaving 8 bytes to work out
![startofkey](https://raw.githubusercontent.com/elemental-unicorn/picoctf-2022/master/reverse_eng/keygenme/.img/startofkey.png)
We can target the strlen function to get close to our comparison by opening the binary with GDB and setting a breakpoint for `strlen`
![strlen_close](https://raw.githubusercontent.com/elemental-unicorn/picoctf-2022/master/reverse_eng/keygenme/.img/strlen_close.png)
```bashbreak strlen```
Running the application now with a dummy key filling the blank space with `AAAAAAAA` will help us to process as the hex value of `A` is `0x41`.
```r <<