<?
/**
* Enigma - emulator
*
* <pre>
*
* Information used to create this package come from http://en.wikipedia.org/wiki/Enigma_machine
* and the manual from "Enigma Simulator" by D. Rijmenants
* http://users.telenet.be/d.rijmenants/
* I tested proper encryption against "Enigma Simulator" by D. Rijmenants
* http://www.xat.nl/enigma/
*
* This package provides the funtionality of 3 different Enigma models:
* - Wehrmacht / Luftwaffe 3 rotor model
* - Kriegsmarine 3 rotor model
* - Kriegsmarine 4 rotor model
*
* Each model can be equipped with a different set of rotors and refelctors.
* All in all are 10 types of rotors and 4 types of refelctors available.
*
* Wehrmacht / Luftwaffe 3 rotor model uses:
* rotors: I, II, III, IV, V
* reflectors: B, C
*
* Kriegsmarine 3 rotor model uses:
* rotors: I, II, III, IV, V, VI, VII, VIII
* reflectors: B, C
*
* Kriegsmarine 4 rotor model uses:
* rotors: I, II, III, IV, V, VI, VII, VIII, Beta, Gamma
* reflectors: B Thin, C Thin
*
* Each rotor and reflector provides a unique wiring, which can not be changed.
* Settings are:
* Contacts = ABCDEFGHIJKLMNOPQRSTUVWXYZ
* I = EKMFLGDQVZNTOWYHXUSPAIBRCJ
* II = AJDKSIRUXBLHWTMCQGZNPYFVOE
* III = BDFHJLCPRTXVZNYEIWGAKMUSQO
* IV = ESOVPZJAYQUIRHXLNFTGKDCMWB
* V = VZBRGITYUPSDNHLXAWMJQOFECK
* VI = JPGVOUMFYQBENHZRDKASXLICTW
* VII = NZJHGRCXMYSWBOUFAIVLPEKQDT
* VIII = FKQHTLXOCBJSPDZRAMEWNIUYGV
* Beta = LEYJVCNIXWPBQMDRTAKZGFUHOS
* Gamma = FSOKANUERHMBTIYCWLQPZXVGJD
* B = YRUHQSLDPXNGOKMIEBFZCWVJAT
* C = FVPJIAOYEDRZXWGCTKUQSBNMHL
* B Thin = ENKQAUYWJICOPBLMDXZVFTHRGS
* C Thin = RDOBJNTKVEHMLFCWZAXGYIPSUQ
* Contacts = ABCDEFGHIJKLMNOPQRSTUVWXYZ
*
* Rotors can have notches, which indicate the position where the next rotor is advanced.
* e.g.: Notch at position Q means, if rotor steps from Q to R, the next rotor is advanced.
* These positions are:
* I = Q
* II = E
* III = V
* IV = J
* V = Z
* VI, VII, VIII = Z + M
*
* Each Rotor can be only used in one position at a time.
* Rotors I..VIII can be mounted at position 1, 2 or 3, wherelse rotors Beta and Gamma
* can only be used at position 4.
* Aditionally, Beta and Gamma can only be used in combination with reflector B Thin or
* C Thin, the others only with reflector B or C.
*
* !!!important!!!
* These conditions only apply if a proper emulation of the original Enigma is desired.
* This implementation allows to setup the rotors in any order, so its up to the user to
* take care of the order of rotors.
*
* <b>usage:</b>
*
* to create a new instance call the constructor with the following parameters:
* $enigma = new Enigma(integer $model, array $rotors, integer $reflector);
* $model ... ENIGMA_MODEL_WMLW | ENIGMA_MODEL_KMM3 | ENIGMA_MODEL_KMM4
* defines the model to emulate
* $rotors ... IDs to identify the rotors for the initial setup
* number of IDs has to match the number needed by the specific model
* $reflector ... ID to identify the reflector for the initial setup
*
* to en- or decode a letter, use
* string $enigma->encodeLetter (string $letter)
*
* to change the setup of the Enigma, these functions can be used:
*
* void $enigma->mountRotor (integer $position, integer $rotor);
* replace a rotor by another
*
* void $enigma->mountReflector (integer $reflector);
* replace a reflector by another
*
* void $enigma->setPosition (integer $position, string $letter)
* turn a rotor to a new position
*
* void $enigma->setRingstellung (integer $position, string $letter)
* turn the ringstellungon a rotor to a new position
*
* void $enigma->plugLetters (string $letter1, string $letter2)
* connect two letters on the plugboard
*
* void $enigma->unplugLetters (string $letter)
* disconnect two letters on the plugboard
*
* the current position of a rotor can be obtained by
* string $enigma->getPosition (integer $position)
*
*
* </pre>
*
*/
?>
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