Added Dart implementation

Dart/xorencryption.dart

@@ -0,0 +1,20 @@
+
+String encryptDecrypt(String input) {
+  var key = ['K', 'C', 'Q']; //Can be any chars, and any size array
+  var output = [];
+  
+  for(var i = 0; i < input.length; i++) {
+    var charCode = input.codeUnitAt(i) ^ key[i % key.length].codeUnitAt(0);
+    output.add(new String.fromCharCode(charCode));
+  }
+  
+  return output.join("");
+}
+
+void main() {
+  String encrypted = encryptDecrypt("kylewbanks.com");
+  print("Encrypted:" + encrypted);
+  
+  String decrypted = encryptDecrypt(encrypted);
+  print("Decrypted:" + decrypted);
+}

README.md

@@ -5,6 +5,7 @@ Simple implementation of XOR Encryption/Decrypting in various languages, includi
 
 - [C](C/main.c)
 - [C++](C++/main.cpp)
+- [Dart](Dart/xorencryption.dart)
 - [Groovy](Groovy/XOREncryption.groovy)
 - [Java](Java (Android compatible\)/XOREncryption.java) 
 - [JavaScript](JavaScript/XOREncryption.js)
@@ -13,6 +14,6 @@ Simple implementation of XOR Encryption/Decrypting in various languages, includi
 
 This implementation goes beyond the basic single-key model to use multiple keys in a particular sequence, making it that much more difficult to brute-force.
 
-In these examples, I'm encrypting the same string with the same keys in order to keep consistency with the output, and to demonstrate that an encrypted string from a C program will be decryptable in a Java application, etc.
+In these examples, I'm encrypting the same string with the same keys in order to keep consistency with the output, and to demonstrate that an encrypted string from a C program can be decrypted in a Java application, or any combination, so long as the keys remain the same.
 
 For an in-depth explanation of the code, check out [KyleWBanks.com](http://kylewbanks.com/post/show/Simple-XOR-Encryption-Decryption-in-Cpp).