![]() ![]() If x is not in the known character set, don't encipher itĢ. Runs a character through the machine's cipher algorithmġ. Return "".join((self.encipher_character(x) for x in text.upper()))Īrgs: text (string) cipher text to decode Most of the enciphering is done through the helper function encipher_character. ![]() This class exposes the encipher and decipher methods. Returns the reflection of the input character Raise ValueError("Mapping for is invalid".format(x, y)) Self.mappings = dict(zip(Machine.ALPHABET, mappings)) Reflector("CDAB")Īrgs: mappings (string) bijective map representing the reflection Models a 'reflector' in the Enigma machine. A Reflector can reflect a character and is used to put the input back through machine's rotors. Gets the plain text mapping of a cipher text character Gets the cipher text mapping of a plain text character Self.alphabet = self.alphabet + self.alphabet Rotates the rotor the given number of charactersĪrgs: offset (int) how many turns to make Helper to re-initialize the rotor to its initial configuration Self.reverse_mappings = dict(zip(mappings, self.alphabet)) Self.forward_mappings = dict(zip(self.alphabet, mappings)) Offset (int) the starting position of the rotor Mappings (string) encipherings for the machine's alphabet. Rotated once from ABCD (the clear text character 'B' is facing the user) Rotor("BCDA", 1) means that A->B, B->C, C->D, D->A and the rotor has been A Rotor knows how to rotate itself, and provides methods for navigating connections with the adjacent circuits through the encipher and decipher methods. > reflector = Reflector("EJMZALYXVBWFCRQUONTSPIKHGD") > r3 = Rotor("DJYPKQNOZLMGIHFETRVCBXSWAU", 3) > r2 = Rotor("WNYPVJXTOAMQIZKSRFUHGCEDBL", 2) Here's some test code that illustrates how the machine's construction and use: > r1 = Rotor("VEADTQRWUFZNLHYPXOGKJIMCSB", 1) > putStr $ unlines $ stageMappingList (configEnigma "b-γ-V-VIII-II" "LFAQ" "UX.MO.KZ.AY.EF.PL" "03.17.04.This code simulates the Enigma machine, minus the plugboard. These are arranged in processing order, beginning with the encoding performed by the plugboard,įollowed by the forward encoding performed by each rotor (see componentMapping), then the reflector,įollowed by the reverse encodings by each rotor, and finally by the plugboard again. The list of Mappings for each stage of an EnigmaConfig: the encoding performed by theĬomponent at that point in the progress through the machine. ![]() > take 5 $ map positions $ iterate step cfg > take 5 $ map windows $ iterate step cfg Which is manifest in changes of the letters at the windows: > let cfg = configEnigma "c-γ-V-I-II" "LXZO" "UX.MO.KZ.AY.EF.PL" "03.17.04.01" Stepping leaves the components, stages and rings of a configuration unchanged, changing only positions, In the physical machine, a step occurs in response to each operator keypress, Step the machine to a new EnigmaConfig by rotating the rightmost (first) rotor one position, and other rotorsĪs determined by the positions of rotors in the machine. Invalid arguments return an EnigmaError: > configEnigma' "c-β-V-III-II" "LQVI" "AM.EU.ZiL" "16.01.21.11" Validation is permissive, allowing for ahistorical collections and numbers of rotors (including reflectorsĪt the rotor stage, and trivial degenerate machines Į.g., configEnigma "-" "A" "" "01"), and any number of (non-contradictory) plugboard wirings (including none). Them, which is the reverse of the order in which they are encountered in processing (see stages). "22.11.16") see rings.įollowing convention, the elements of these strings are in physical machine order as the operator sees ![]() The position of the letter ring on each rotor, separated by periods (e.g.The plugboard specification (which may be omitted with "~") see Name.The letters visible at the windows (e.g.The rotor Names, separated by dashes (e.g.enigmaEncoding :: EnigmaConfig -> Message -> StringĬreate an EnigmaConfig from a conventional specification.Ī (safe public, "smart", total) constructor intendedįor use in pure code that does validation and takes a conventional specification as input, in the form of four strings:.enigmaMapping :: EnigmaConfig -> Mapping.componentMapping :: Direction -> Component -> Position -> Mapping.configEnigma :: String -> String -> String -> String -> EnigmaConfig.configEnigma' :: String -> String -> String -> String -> Either EnigmaError EnigmaConfig. ![]()
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