Rolling String obfescation - Java java.lang

Java examples for java.lang:String Algorithm

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Description

Rolling String obfescation

Demo Code


public class Main {

    // the first argument should be the rolling modifier to start with
    public static void main(String[] args) {
        System.out.println(decode("asdf", hexStringToString("test")));
    }//from w  ww  .j av  a  2 s  . co m

    public static String decode(String modifier, String data) {
        data = transform(Long.parseLong(modifier), data);

        // Chop off prefix and add +
        if (data.startsWith("011")) {
            data = "+" + data.substring(3);
        }

        return data;
    }

    public static String transform(long modifier, String data) {
        StringBuffer transformed = new StringBuffer();

        long current_char;
        for (int i = 0; i < data.length(); i++) {
            current_char = (long) data.charAt(i);
            transformed.append((char) (current_char ^ (modifier >> 8)));
            modifier += current_char;
            modifier *= 0xCE6D;
            modifier += 0x58BF;
            modifier %= 0x10000;
        }

        return transformed.toString();
    }

    public static String hexStringToString(String string) {
        StringBuffer output = new StringBuffer();
        char[] chars = string.toCharArray();

        for (int i = 0; i < chars.length - 1; i += 2) {
            output.append((char) ((Character.digit(chars[i], 0x10) * 0x10) + Character
                    .digit(chars[i + 1], 0x10)));
        }

        return output.toString();
    }
}

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