Merge branch 'main' of https://github.com/BCACTF/bcactf-5.0 into fore…

…n/sea-scavenger

my-brain-hurts/chall.yaml

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+name: My Brain Hurts
+categories:
+  - rev
+value: 25
+flag: bcactf{Br41n_fcK-1s-fUn}
+description: |-
+  My friend sent me a weird string and a "program" they wrote, although it doesn't seem anything interpretable to me. Can you help me find out what they put through their program?
+hints:
+  - If you don't know where to start, look into an esoteric coding language called "Brain F*ck"
+files:
+  - src: ./script.txt
+  - src: ./string.txt
+authors:
+  - Kai Lindemer
+visible: true

my-brain-hurts/script.txt

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+,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,<----<++++++<---------<++<-<+++++<-------<+++++++++<-------<----<---<++++<--<+++<+++++++<+++<+<++<---------------<+++++<-------<---<----.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.

my-brain-hurts/solve.txt

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+Brainfuck uses + and - to adjust the value of the char at the currently selected position, so all you have to do is swap all the + and -'s to get the flag.
+Here is the code that does that:
+,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,>,<++++<------<+++++++++<--<+<-----<+++++++<---------<+++++++<++++<+++<----<++<---<-------<---<-<--<+++++++++++++++<-----<+++++++<+++<++++.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.>.
+On a brainfuck compiler, put this as the code and ^`Zheh|Ey7/r\b\T&6r/][j} as the input.

my-brain-hurts/string.txt

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+^`Zheh|Ey7/r\b\T&6r/][j}