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PHP Enigma Machine
<?php namespace App\Services;
/**
* A PHP version of the Enigma machine.
* Wikipedia: http://en.wikipedia.org/wiki/Enigma_machine
*
* This might not be an accurate representation. I have never seen, nor used an enigma machine.
* This class was created by reading the article at http://enigma.louisedade.co.uk/howitworks.html.
*
* Usage:
*
* //Instantiate
* $enigma = new Enigma();
*
* // Encrypt and decrypt a string
* // Spaces and special characters not yet supported
* $encrypted = $enigma->enigmify('String');
* $decrypted = $enigma->denigmify($encrypted);
*
* // Encrypt and decrypt a single character
* $encryptedChar = $enigma->encryptCharacter('A');
* $decryptedChar = $enigma->decryptCharacter($encryptedChar);
*
* // Make a custom machine with three rotors
* $machine = $enigma->make($rotors = 3);
*
**/
class Enigma {
/**
* Numbers array.
*
* @var array
*/
protected $numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
/**
* Letters array.
*
* @var array
*/
protected $letters = [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
];
/**
* The machine!.
*
* @var array
*/
protected $machine = [
'plugboard' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
'rotors' => [
'rotor_1' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
'rotor_2' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
'rotor_3' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
'rotor_4' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
'rotor_5' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
],
'reflector' => [
'A' => 'h', 'B' => 'E', 'C' => 'g', 'D' => 'P', 'E' => 'S', 'F' => 'N', 'G' => 'n',
'H' => 'w', 'I' => 'F', 'J' => 'm', 'K' => 'b', 'L' => 'l', 'M' => 'I', 'N' => 'V',
'O' => 'e', 'P' => 'f', 'Q' => 'Z', 'R' => 'J', 'S' => 'A', 'T' => 'o', 'U' => 'D',
'V' => 'u', 'W' => 'L', 'X' => 'i', 'Y' => 'Y', 'Z' => 'O', 'a' => 'B', 'b' => 'r',
'c' => 'W', 'd' => 'a', 'e' => 'x', 'f' => 'R', 'g' => 'Q', 'h' => 'X', 'i' => 'c',
'j' => 'y', 'k' => 'K', 'l' => 'T', 'm' => 'C', 'n' => 'j', 'o' => 'p', 'p' => 'G',
'q' => 'd', 'r' => 'H', 's' => 'k', 't' => 'z', 'u' => 's', 'v' => 't', 'w' => 'U',
'x' => 'M', 'y' => 'v', 'z' => 'q', '0' => '2', '1' => '5', '2' => '3', '3' => '1',
'4' => '0', '5' => '9', '6' => '8', '7' => '7', '8' => '6', '9' => '4',
],
];
/**
* Returns a generated machine array.
*
* @param int $rotors. How many rotors to generate.
* @return array
*/
public function make($rotors = 3)
{
$count = $rotors + 1;
$result = array();
$result['plugboard'] = $this->MakeRotor();
$rotors = array();
for ($i=1; $i < $count; $i++) {
$rotors['rotor_'.$i] = $this->MakeRotor();
}
$result['rotors'] = $rotors;
$result['reflector'] = $this->MakeRotor();
return $result;
}
/**
* Returns a generated rotor array.
*
* @return array
*/
public function makeRotor()
{
$rotor = array();
$let = $this->CloneArray($this->letters);
$num = $this->CloneArray($this->numbers);
shuffle($let);
shuffle($num);
$letterCount = count($this->letters);
for ($i=0; $i < $letterCount; $i++) {
$rotor[$this->letters[$i]] = $let[$i];
}
$numberCount = count($this->numbers);
for ($i=0; $i < $numberCount; $i++) {
$rotor[$this->numbers[$i]] = $num[$i];
}
return $rotor;
}
/**
* Encrypts a character.
*
* @param string $character. The single character to encrypt.
* @return string
*/
public function encryptCharacter($character)
{
$result = $character;
$result = $this->plugboard[$result];
foreach ($this->rotors as $key => $value) {
$result = $value[$result];
}
$result = $this->reflector[$result];
$count = count($this->rotors) - 1;
for ($i = $count; $i > 0 ; $i--) {
$result = $this->rotors['rotor_'.$i][$result];
}
$result = $this->plugboard[$result];
return $result;
}
/**
* Decrypts a character.
*
* @param string $character. The single character to decrypt.
* @return string
*/
public function decryptCharacter($character)
{
$result = $character;
$result = array_search($result, $this->plugboard);
foreach ($this->rotors as $key => $value) {
$result = array_search($result, $this->rotors[$key]);
}
$result = array_search($result, $this->reflector);
$count = count($this->rotors) - 1;
for ($i = $count; $i > 0 ; $i--) {
$result = array_search($result, $this->rotors['rotor_'.$i]);
}
$result = array_search($result, $this->plugboard);
return $result;
}
/**
* Returns an encrypted string.
*
* @param string $secret. The unencrypted string to send through the machine.
* @return string
*/
public function enigmify($secret)
{
$exploded = str_split($secret);
$enigmified = '';
foreach ($exploded as $character) {
$enigmified .= $this->EncryptCharacter($character);
}
return $enigmified;
}
/**
* Returns a decrypted string.
*
* @param string $secret. The encrypted string to send through the machine.
* @return string
*/
public function denigmify($secret)
{
$exploded = str_split($secret);
$denigmified = '';
foreach ($exploded as $character) {
$denigmified .= $this->DecryptCharacter($character);
}
return $denigmified;
}
/**
* Helper function that returns a clone of an array.
*
* @param array $array. The array to clone.
* @return array
*/
public function cloneArray($array)
{
$ArrayObject = new ArrayObject($arr);
return $ArrayObject->getArrayCopy();
}
/**
* Magic get used for accessing the machine.
*
* @param string $name.
* @return mixed
*/
public function __get($name)
{
if (array_key_exists($name, $this->machine)) {
return $this->machine[$name];
}
}
}
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