enigma

Enigma-type Machine - Old School C

N.B. This is only an approximation to the actual Enigma algorithm.

e.g. the odometer assumption mentioned here (in "Incrementing The Rotors"):

http://practicalcryptography.com/ciphers/enigma-cipher/

For a full implementation this work looks good (enigma.c in "C Code for Breaking Enigma"):

http://practicalcryptography.com/cryptanalysis/breaking-machine-ciphers/cryptanalysis-enigma/