LeoFVO / flag4ctf

Cli tool to build CTF Flags. Give the sentence, it build the flag.

flag4ctf

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

Usage

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}

Easy Installation

Binary Releases

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.

Using go install

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.

Using Docker

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

Building From Source

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.

Compiling

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

License

See the LICENSE file.