#import "GKStringEncryption.h"

NSString *cipher(NSString *input) {
	NSMutableString* output = [NSMutableString stringWithCapacity:[input length]];
	int i;
	for(i = 0; i < [input length]; i++) {
		unichar c = [input characterAtIndex:i];
		int cipher = ((i + 1) * 5) & 0x1f;
		c ^= cipher;
		[output appendFormat:@"%c", c];
	}
	return output;
}