Zoltan Hudak / Enigma

Encryption library based on the Enigma machine. It's capable to encrypt any byte, not only the 26 capital letters of the alphabet.

Dependents:   Enigma_Hello

Encryption library based on the Enigma machine. It is capable to encrypt any byte, not only the 26 capital letters of the alphabet as the original Enigma machine did. Combining three rotors from a set of five, each of the 3 rotor setting with 256 positions, and the plugboard with 120 pairs of plugs connected it has staggering (5 * 4 * 3) * 256^3 * [256! / ((256 - 2 * 120)! * 120! * 2^120)] = 4.6415160521069700910027304860568e+267 different settings. In other words, it uses a 889-bit key for encryption & decryption of data.

Enigma.h@4:107a360171fe, 2019-09-24 (annotated)

Committer:
hudakz
Date:
Tue Sep 24 16:56:56 2019 +0000
Revision:
4:107a360171fe
Parent:
2:ee55abc2b6a2 
Encryption library based on the Enigma machine. It's capable to encrypt any byte, not only the 26 capital letters of the alphabet.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:7a702d2d6b54 1 #ifndef ENIGMA_H
hudakz 0:7a702d2d6b54 2 #define ENIGMA_H
hudakz 0:7a702d2d6b54 3
hudakz 0:7a702d2d6b54 4 #include "mbed.h"
hudakz 0:7a702d2d6b54 5
hudakz 2:ee55abc2b6a2 6
hudakz 0:7a702d2d6b54 7 class Enigma
hudakz 0:7a702d2d6b54 8 {
hudakz 0:7a702d2d6b54 9 size_t _len;
hudakz 0:7a702d2d6b54 10 uint32_t _seed;
hudakz 0:7a702d2d6b54 11 uint8_t _entryWheel[256];
hudakz 0:7a702d2d6b54 12 uint8_t* _rightRotor;
hudakz 0:7a702d2d6b54 13 uint8_t* _middleRotor;
hudakz 0:7a702d2d6b54 14 uint8_t* _leftRotor;
hudakz 0:7a702d2d6b54 15 uint8_t* _reflector;
hudakz 0:7a702d2d6b54 16 uint8_t _leftRotorPos;
hudakz 0:7a702d2d6b54 17 uint8_t _middleRotorPos;
hudakz 0:7a702d2d6b54 18 uint8_t _rightRotorPos;
hudakz 2:ee55abc2b6a2 19 uint8_t (*_plugboard)[2];
hudakz 2:ee55abc2b6a2 20 uint8_t _cords;
hudakz 0:7a702d2d6b54 21
hudakz 0:7a702d2d6b54 22 size_t _mod(long i);
hudakz 0:7a702d2d6b54 23 int _find(uint8_t byte, uint8_t* array);
hudakz 0:7a702d2d6b54 24 public:
hudakz 0:7a702d2d6b54 25 static const uint8_t ROTOR_I[256];
hudakz 0:7a702d2d6b54 26 static const uint8_t ROTOR_II[256];
hudakz 0:7a702d2d6b54 27 static const uint8_t ROTOR_III[256];
hudakz 0:7a702d2d6b54 28 static const uint8_t ROTOR_IV[256];
hudakz 0:7a702d2d6b54 29 static const uint8_t ROTOR_V[256];
hudakz 0:7a702d2d6b54 30 static const uint8_t REFLECTOR[256];
hudakz 0:7a702d2d6b54 31
hudakz 2:ee55abc2b6a2 32 // Constructor
hudakz 0:7a702d2d6b54 33 Enigma
hudakz 0:7a702d2d6b54 34 (
hudakz 0:7a702d2d6b54 35 const uint8_t* leftRotorSel,
hudakz 0:7a702d2d6b54 36 const uint8_t* middleRotorSel,
hudakz 0:7a702d2d6b54 37 const uint8_t* rightRotorSel,
hudakz 0:7a702d2d6b54 38 uint8_t leftRotorPos,
hudakz 0:7a702d2d6b54 39 uint8_t middleRotorPos,
hudakz 2:ee55abc2b6a2 40 uint8_t rightRotorPos,
hudakz 2:ee55abc2b6a2 41 uint8_t (*plugboard)[2],
hudakz 2:ee55abc2b6a2 42 uint8_t cords
hudakz 0:7a702d2d6b54 43 );
hudakz 0:7a702d2d6b54 44
hudakz 2:ee55abc2b6a2 45 // Methods
hudakz 1:a21920e248d3 46 uint8_t* encrypt(uint8_t* out, const uint8_t* in, size_t len);
hudakz 1:a21920e248d3 47 uint8_t* decrypt(uint8_t* out, const uint8_t* in, size_t len);
hudakz 0:7a702d2d6b54 48
hudakz 2:ee55abc2b6a2 49 // Helpers
hudakz 0:7a702d2d6b54 50 void genRotorWiring(const char* name, unsigned seed);
hudakz 0:7a702d2d6b54 51 void genReflectorWiring(unsigned seed);
hudakz 0:7a702d2d6b54 52 };
hudakz 0:7a702d2d6b54 53 #endif // ENIGMA_H