atomicframeworks/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    Caesar Cipher

A Caesar cipher in 133 bytes.
"In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence."
Wikipedia
Source

var caesar = function(a,b,c){return a.replace(/[A-z]/g,function(a){c=(a=a.charCodeAt())>96?97:65;return String.fromCharCode((a+b%26+26-c)%26+c)})}
For more information

See the 140byt.es site for a showcase of entries (built itself using 140-byte entries!), and follow @140bytes on Twitter.
To learn about byte-saving hacks for your own code, or to contribute what you've learned, head to the wiki.
140byt.es is brought to you by Jed Schmidt, with help from Alex Kloss. It was inspired by work from Thomas Fuchs and Dustin Diaz.

  
## annotated.js
function(
    a,      // Input text
    b,      // Number of places to shift each character
    c       // Placeholder for character offset
){
    return a.replace(/[A-z]/g,function(a) {             // Replace all A-Z and a-z characters function (r)
        c = (a = a.charCodeAt()) > 96 ? 97 : 65;        // Set a to the character code. Set the character offset based on it
        return String.fromCharCode(                     // Create a string from the rotated value
            (a + b % 26 + 26 - c) % 26 + c              // Shift the character while making sure it is in the character set
        )
    })
}

## index.js
function(a,b,c){return a.replace(/[A-z]/g,function(a){c=(a=a.charCodeAt())>96?97:65;return String.fromCharCode((a+b%26+26-c)%26+c)})}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 Kevin M. McGinty www.atomicframeworks.com

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "caesarCipher",

  "description": "A Caesar cipher aka shift cipher",

  "keywords": [
    "caesar",
    "cipher",
    "string",
    "encrypt",
    "decrypt"
  ]
}

## test.html
<!DOCTYPE html>
<title>Caesar Cipher</title>
<div>Expected encrypted value: <b>xyzabcdefghijklmnopqrstuvwXYZABCDEFGHIJKLMNOPQRSTUVW</b></div>
<div>Actual encrypted value: <b id="encrypted"></b></div>
<div>Expected decrypted value: <b>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ</b></div>
<div>Decrypted value: <b id="decrypted"></b></div>
<div>Expected test high and low multiple value: <b>true</b></div>
<div>Test high and low multiple value: <b id="multiple"></b></div>


<script>

  var caesar = function(a,b){return a.replace(/./g,function(a){return String.fromCharCode(a.charCodeAt()^b)})}

  document.getElementById( "encrypted" ).innerHTML = caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 23);
  document.getElementById( "decrypted" ).innerHTML = caesar('xyzabcdefghijklmnopqrstuvwXYZABCDEFGHIJKLMNOPQRSTUVW', -23);

  // Rotating by any positive or negative multiple of 26 should equal the original text.
  document.getElementById( "multiple" ).innerHTML = (
    'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' === caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', -26 * 12345) &&
    'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' === caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 26 * 54321)
  );
</script>
	function(
	a, // Input text
	b, // Number of places to shift each character
	c // Placeholder for character offset
	){
	return a.replace(/[A-z]/g,function(a) { // Replace all A-Z and a-z characters function (r)
	c = (a = a.charCodeAt()) > 96 ? 97 : 65; // Set a to the character code. Set the character offset based on it
	return String.fromCharCode( // Create a string from the rotated value
	(a + b % 26 + 26 - c) % 26 + c // Shift the character while making sure it is in the character set
	)
	})
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2013 Kevin M. McGinty www.atomicframeworks.com

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "caesarCipher",

	"description": "A Caesar cipher aka shift cipher",

	"keywords": [
	"caesar",
	"cipher",
	"string",
	"encrypt",
	"decrypt"
	]
	}
	<!DOCTYPE html>
	<title>Caesar Cipher</title>
	<div>Expected encrypted value: <b>xyzabcdefghijklmnopqrstuvwXYZABCDEFGHIJKLMNOPQRSTUVW</b></div>
	<div>Actual encrypted value: <b id="encrypted"></b></div>
	<div>Expected decrypted value: <b>abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ</b></div>
	<div>Decrypted value: <b id="decrypted"></b></div>
	<div>Expected test high and low multiple value: <b>true</b></div>
	<div>Test high and low multiple value: <b id="multiple"></b></div>


	<script>

	var caesar = function(a,b){return a.replace(/./g,function(a){return String.fromCharCode(a.charCodeAt()^b)})}

	document.getElementById( "encrypted" ).innerHTML = caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 23);
	document.getElementById( "decrypted" ).innerHTML = caesar('xyzabcdefghijklmnopqrstuvwXYZABCDEFGHIJKLMNOPQRSTUVW', -23);

	// Rotating by any positive or negative multiple of 26 should equal the original text.
	document.getElementById( "multiple" ).innerHTML = (
	'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' === caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', -26 * 12345) &&
	'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' === caesar('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 26 * 54321)
	);
	</script>