* @return the n-folded data of the specified length
     */
    public static byte[] expandNFold(byte[] data, int outlen) {
        int lcm = lcm(outlen, data.length);
        byte[] buf = new byte[outlen];
        int carry = 0;
        for (int i = lcm - 1; i >= 0; i--) {
            carry = carry_add(data, buf, carry, i);
        }

        if (carry != 0) {

= 1 A = 1 B = 0 LCM = 0 GCD = 1 A = 1 B = 1 LCM = 1 GCD = 2b2 A = dfccaa3549c1b59ab3e1 B = fa58a81f43088da45e65 LCM = 5132f7ab7a982b9dc551 GCD = 8e A = 248d96a8a4cab0a1b194 B = 4c7bad8e1844901fd6a2 LCM = 13b01f9d9c6c13e90c97 GCD = 3e55 A = 2fa97382f46676b7a4cc B = ab08ad074139963bc18e LCM = 82c7c377ecda2cb92286 GCD = a7a A = 923706dfed67834a1e7e B = 64473e878a29021fac1c LCM = 57785ca45b8873032f17 GCD = 42 A = 0 B = 42 LCM = 0 GCD = 42 A = 42 B = 0 LCM = 0 GCD = 42 A = 42 B = 42 LCM = 42 GCD = f60d...