简单异或加密代码--IOS版（广点通）

- (NSData *)simpleXor:(NSString *)info key:(NSString *)key {

const char *infoBytes = [info UTF8String];
const char *keyBytes = [key UTF8String];

int i = 0, j = 0;
char *bytes = malloc(strlen(infoBytes));
for (i = 0; i < strlen(infoBytes); i++) {
bytes[i] = (char)(infoBytes[i]^keyBytes[j]);
//        if (bytes[i] == '\0') {
//            NSLog(@"fuck");
//        }

j++;
j = j%(key.length);
}

//这一定要用strlen(infoBytes),不要用strlen(bytes),因为bytes里面有\0,而strlen只计算\0之前数，所以最终的长度偏小
NSData *data = [NSData dataWithBytes:bytes length:strlen(infoBytes)];
return data;
}