Actionscript:
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var encode:Object = new Object();
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var decode:Object = new Object();
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var a:Array = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".split("");
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// change this for different encoded results
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var offset:int = 10;
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for (var i:int = 0; i<a.length; i++){
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var index:int = (a.length - i - offset) % a.length;
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encode[a[i]] = a[index];
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decode[a[index]] = a[i];
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}
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function encodeString(str:String):String{
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return map(str, encode);
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}
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function decodeString(str:String):String{
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return map(str, decode);
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}
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function map(str:String, smode:Object):String{
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var n:String = "";
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for (var i:int = 0; i<str.length; i++){
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var char:String = str.charAt(i);
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var en:String = smode[char];
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if (en){
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n += en;
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}else{
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n += char;
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}
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}
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return n;
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}
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// test out the functions
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var input:String = "This is a regular string";
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trace(input);
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var encoded:String = encodeString(input);
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trace("encoded: ", encoded);
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trace("decoded: ",decodeString(encoded));
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/*
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outputs:
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This is a regular string
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encoded: gSRH1RH1Z1IVTFOZI1HGIRMT
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decoded: This is a regular string
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*/
The above demos an intentionally simple string encoding technique.
This is a technique I use if I need to encode strings but don't care if someone figures out what the string value actually is. For me, this is more common than needing hard/impossible to crack string encoding algorithms. A good example is an e-card... a url for an ecard could look like this:
www.birthdaycardthing.com/?name=joe&age=32
or it could look like this:
www.birthdaycardthing.com/?i=brx&x=5p
I wrapped this snippet up into a class and made a few minor tweaks. The class is called SimpleCipher it has two static methods and one static property...
Actionscript:
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import com.actionsnippet.utils.SimpleCipher;
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// same as offset above, but can be set at any time
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// new encode and decode Objects will be calculated
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SimpleCipher.offset = 1;
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var input:String = "SimpleCipher encoding and decoding";
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trace("input: ", input);
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var encoded:String = SimpleCipher.encode(input);
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trace("encoded: ", encoded);
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trace("decoded: ", SimpleCipher.decode(encoded));
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/*
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outputs:
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input: SimpleCipher encoding and decoding
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encoded: RhlokdBhogdq0dmbnchmf0 mc0cdbnchmf
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decoded: SimpleCipher encoding and decoding
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*/
Download SimpleCipher Class
(this class uses a static initializer... see yesterdays post)