Flag build for CTFs. Provide a string and it build the "flag like" string.

Default

flag4ctf make "Well played, you got the flag"

> FLAG{well_played_y0u_g0t_the_fl4g}

Change the flag prefix

flag4ctf make "Well played, you got the flag" -p "CTF"

> CTF{Well played, you got the flag}

Change the flag case format

flag4ctf make "Well played, you got the flag" -c lower

> FLAG{well_played_y0u_g0t_the_fl4g}

flag4ctf make "Well played, you got the flag" -c upper

> FLAG{WELL_PLAYED_Y0U_G0T_THE_FL4G}

We are now shipping binaries for each of the releases so that you don't even have to build them yourself! How wonderful is that!

If you're stupid enough to trust binaries that I've put together, you can download them from the releases page.

If you have a Go environment ready to go (at least go 1.19), it's as easy as:

go install github.com/LeoFVO/flag4ctf@latest

PS: You need at least go 1.19 to compile flag4ctf.

docker pull ghcr.io/leofvo/flag4ctf:latest
docker run flag4ctf:latest

Since this tool is written in Go you need to install the Go language/compiler/etc. Full details of installation and set up can be found on the Go language website. Once installed you have two options. You need at least go 1.19 to compile flag4ctf.

flag4ctf has external dependencies, and so they need to be pulled in first:

go get && go build

This will create a flag4ctf binary for you. If you want to install it in the $GOPATH/bin folder you can run:

go install

See the LICENSE file.