Added Objective-C implementationg

Objective-C/main.m

@@ -0,0 +1,45 @@
+//
+//  main.m
+//  XOREncryption
+//
+//  Created by Kyle Banks on 2013-10-06.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface XOREncryption : NSObject
++(NSString *) encryptDecrypt:(NSString *)input;
+@end
+
+@implementation XOREncryption
+
++(NSString *) encryptDecrypt:(NSString *)input {
+    char key[] = {'K', 'C', 'Q'};
+    NSMutableString *output = [[NSMutableString alloc] init];
+    
+    for(int i = 0; i < input.length; i++) {
+        char c = [input characterAtIndex:i];
+        c ^= key[i % sizeof(key)/sizeof(char)];
+        [output appendString:[NSString stringWithFormat:@"%c", c]];
+    }
+    
+    return output;
+}
+
+@end
+
+
+
+int main(int argc, const char * argv[])
+{
+
+    @autoreleasepool {
+        NSString *encrypted = [XOREncryption encryptDecrypt:@"kylewbanks.com"];
+        NSLog(@"Encrypted:%@", encrypted);
+        
+        NSString *decrypted = [XOREncryption encryptDecrypt:encrypted];
+        NSLog(@"Decrypted:%@", decrypted);
+    }
+    return 0;
+}
+