Build:

gcc keygenme.c -o keygenme

Example Run:

ekolodenker@mitre:~/code$ ./keygenme
Give me a key: asdagajgajkgkjlsdgkjldsg
ekolodenker@mitre:~/code$ ./keygenme
Give me a key: LET ME IN
ekolodenker@mitre:~/code$ ./keygenme
Give me a key: helloworld123goodbyteworld
ekolodenker@mitre:~/code$ ./keygenme
Give me a key: helloworld123goodbyteworld45678
ekolodenker@mitre:~/code$ ./keygenme
Give me a key: helloworld123goodbyteworld456789
Grats! You made it!