md5 를 옮 겨 다 니 는 작은 방법

public class Test{


    private static final char[] x = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
        'e', 'f' };
    
    
    static MessageDigest d;
    public static void main(String[] args) throws NoSuchAlgorithmException {
        d = MessageDigest.getInstance("MD5");

        
        
        for(int i=0;i<10;i++){
            loop(i+1,"");
        }
        
        //
    }
    
    private static void loop(int i,String s){
        if(i>0){
            for(int k=0;k<x.length;k++){
                loop(i-1,s+x[k]);
            }
        }else{
//            System.out.println(s+"!");
            check(s);
        }
    }
    private static void check(String s){
        d.reset();
        String ta = s;
        d.update((ta).getBytes());
        byte b[] = d.digest();
        
//        System.out.println(bytesToHexStr(b));
        if(bytesToHexStr(b).equals("F7A5C99C58103F6B65C451EFD0F81826")){
            System.out.println(ta);
        }
    }

    private static String bytesToHexStr(byte[] bcd) {

        StringBuffer s = new StringBuffer(bcd.length * 2);

        for (int i = 0; i < bcd.length; i++) {
            s.append(bcdLookup[(bcd[i] >>> 4) & 0x0f]);
            s.append(bcdLookup[bcd[i] & 0x0f]);
        }

        return s.toString();
    }

    private static final char[] bcdLookup = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

}