It started when I directed a colleague to The International Obfuscated C Code Contest. Obfuscation is just so easy in C; but can the same kind of thing be done in Java? Well...
Inspired particularly by the Mullender entry from the very first IOCCC, in 1984, I sat down and thought.
Here is what I came up with:
public class Obfuscated {
static String n, m;
static java.util.Map bm = new java.util.HashMap();
static {
try {
n = new String(new byte[] {79,66,70,85,67,76,65,83,83}, "UTF-8");
bm.put(n, new byte[] {
120,-100,109,80,93,75,2,65,20,61,-41,
-81,117,-73,45,77,-45,62,5,95,34,-19,33,-95,87,-93,
-88,64,8,36,-125,45,95,122,-102,-43,81,70,118,103,
67,103,-125,126,86,61,20,-12,-48,15,-24,71,69,
119,77,-112,-64,121,-72,-9,-50,-103,115,-18,61,119,
-66,127,62,-65,0,-100,-94,70,-80,123,87,-99,-121,
-21,-18,-91,-25,89,32,66,113,34,-98,69,43,16,122,
-36,-22,-7,19,57,48,22,-46,-124,66,-49,31,-59,-77,
-127,48,114,120,-110,16,8,-71,51,-91,-107,57,39,
-92,27,-51,-66,-117,28,44,7,25,-28,9,-103,80,40,
77,-88,54,30,-69,-53,86,-98,-103,42,61,110,55,-5,
-1,6,120,47,51,35,67,11,46,119,-119,98,67,-88,-4,
73,84,-44,-70,99,-66,97,-107,20,97,-37,-59,6,10,
54,-42,81,-28,-74,55,51,125,100,-22,-47,-62,-114,
-118,116,125,20,-21,-117,60,74,-124,-14,10,-79,-123,
45,-126,-11,-108,0,1,-69,-86,52,86,-103,114,81,
-59,-74,-125,10,118,-40,-2,117,52,-108,-68,112,87,
105,121,27,-121,-66,-100,-34,11,63,96,-60,-15,-94,
120,58,-112,29,21,72,16,82,-68,108,114,82,92,-13,
-18,28,-9,-8,86,-29,76,-100,-77,-57,31,-80,95,
-71,32,-20,115,-52,-51,65,-2,106,56,88,91,80,15,-25,
82,-64,126,-61,102,-87,-4,-114,-35,37,-35,-31,
39,36,-97,-119,44,35,7,-13,41,-39,95,48,-4,89,-18
});
m = new String(new byte[] {109,97,105,110}, "UTF-8");
} catch (java.io.UnsupportedEncodingException e) {
}
}
public static void main(String[] a) throws Exception {
ClassLoader cl = new ClassLoader() {
protected Class findClass(String cn) throws ClassNotFoundException {
if (bm.containsKey(cn)) {
try {
java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();
java.util.zip.InflaterOutputStream ios = new java.util.zip.InflaterOutputStream(baos);
ios.write(bm.get(cn));
ios.close();
byte[] bytes = baos.toByteArray();
return defineClass(cn, bytes, 0, bytes.length);
} catch (java.io.IOException e) {
throw new ClassNotFoundException(cn, e);
}
} else {
return super.findClass(cn);
}
}
};
Class c = Class.forName(n, true, cl);
for (java.lang.reflect.Method me : c.getDeclaredMethods()) {
if (m.equals(me.getName()))
me.invoke(null, (Object)a);
}
}
} You can download this code.Not as pithy as Mullender's, but it still has a certain something.
Now, of course, I didn't write that monstrous byte array by hand; in fact, the entire program above was written by another program, which is listed below:
public class Obfuscator {
static String n, m;
static java.util.Map bm = new java.util.HashMap();
static {
try {
n = new String(new byte[] {79,66,70,85,67,76,65,83,83}, "UTF-8");
bm.put(new String(new byte[] {77,101,116,104,111,100,82,101,110,97,109,101,114}, "UTF-8"),
new byte[] {
120,-100,-107,84,-51,78,19,81,24,61,-73,
45,20,-38,-31,-81,-108,42,34,32,32,-38,118,40,
69,65,65,1,21,17,-76,74,107,34,-124,-123,-69,-95,
-67,-64,-32,48,37,-19,-16,-93,111,-30,-54,37,91,77,
68,-125,11,-29,-54,-123,-113,-32,11,-8,14,-58,-120,
-25,78,-85,-87,-76,42,-90,-55,-52,-67,-33,-49,
57,-25,-98,-5,77,63,125,127,-9,30,-64,101,-36,23,
104,74,75,103,61,-97,123,36,109,99,83,22,-4,16,2,
-67,-7,-62,90,50,-65,-78,33,-77,-50,-82,92,73,26,
-59,-51,100,-87,104,38,103,108,57,-86,-56,43,16,
-6,-83,111,120,-61,-40,49,4,26,-14,86,46,-61,125,
81,-96,101,65,-123,-110,-37,-114,105,37,23,-91,51,
41,-32,-73,-27,-82,74,-78,-73,-108,-77,12,123,45,
-71,-24,20,76,123,-115,105,-49,-26,-114,64,-33,-62,
-97,-72,-105,-51,-94,-23,-28,11,44,-84,-97,50,
109,-45,-71,33,48,23,-3,103,-11,49,17,-43,-68,-79,
101,-127,-13,-1,-58,-119,45,107,-48,-48,28,-128,
15,45,26,2,8,54,-62,-125,54,13,-11,-16,-85,85,-69,
-122,6,52,-86,85,7,29,-35,81,77,75,79,-73,100,-54,
46,-38,2,-111,104,-86,54,111,-45,111,-30,-4,-24,
-92,-127,-39,-68,-19,24,-90,77,3,59,-94,21,93,15,
93,109,-109,-79,-57,26,-70,112,54,-120,51,-24,-2,
-53,61,-107,85,-5,-47,-85,-31,20,78,7,113,14,125,
2,-51,-82,-82,121,83,90,-71,-110,-80,-21,-75,-124,
-99,36,-94,-60,123,87,-51,61,-127,11,-47,26,-39,
-22,-112,-122,65,92,8,-48,-98,-117,26,6,112,94,9,
-118,113,68,92,65,37,-55,74,-111,6,-67,-108,27,-94,
17,38,7,-51,-32,33,-108,127,-79,-118,107,76,-107,
-29,-60,28,70,82,57,49,-62,-127,-86,-50,-5,113,
-103,35,-73,110,20,51,114,-49,-95,-36,-88,-14,110,
12,87,-126,24,-59,85,1,-97,-19,-122,-61,-47,88,
-75,-53,26,38,112,77,-43,93,23,104,61,126,22,63,-90,
-120,107,-38,57,-71,-9,112,-11,-40,45,-3,52,32,
-91,-31,6,110,6,48,-115,91,2,-127,-126,-36,-78,-116,
-84,-100,-79,44,-127,-119,26,-27,39,116,-16,54,
102,21,-30,29,106,-97,-51,-25,-92,-6,-62,76,91,
102,-74,55,87,100,97,-55,88,-79,24,105,90,116,-116,
-20,-109,-76,-79,85,-34,7,22,-13,-37,-123,-84,-100,
55,45,-119,62,-70,-17,-29,71,-17,-27,-101,83,
-53,-107,71,-51,-84,-5,-26,60,-13,93,7,-63,25,111,
-30,115,-98,-69,-23,114,125,71,92,127,-117,-42,-72,
126,-128,80,124,-24,0,-31,120,-30,0,-111,87,76,
8,-36,-27,51,-62,54,-80,-83,-114,-115,1,52,-93,-123,
-65,48,90,-103,-27,-32,-107,-95,30,-112,-44,-53,
119,79,-4,53,-62,67,-121,-24,-15,-32,57,26,-72,
-119,-92,-7,8,117,49,-44,-17,-59,43,87,-118,-62,
12,-71,-60,-19,68,12,115,29,65,55,-79,-18,-71,-46,
69,-120,-112,28,-96,50,-16,42,79,-94,-24,39,42,-127,
-69,92,76,-123,-98,-120,119,-6,-34,34,122,-120,
120,29,-10,121,16,-105,-85,50,120,-100,-14,12,41,
-69,56,-86,-35,24,71,-81,75,-23,-125,103,-80,-115,
108,-6,127,115,38,106,113,38,-86,57,-5,-55,57,
64,-50,65,114,94,-84,-32,-12,-88,79,-90,-52,-7,-116,
71,87,-75,-41,-12,-113,-72,-86,120,15,113,73,32,
77,-10,113,65,-10,1,46,-8,-65,-8,1,-45,25,61,-15,
6,51,-98,23,71,95,-12,-124,82,-13,6,115,11,-5,71,
-97,-11,-105,-65,72,123,-36,-85,-113,19,78,-25,
109,37,-24,-20,48,71,35,-55,-56,8,5,-116,-71,2,-126,
-16,124,67,-77,31,-93,95,17,-91,-126,-108,-37,
92,-9,3,-68,-120,101,94
});
bm.put(new String(new byte[] {67,108,97,115,115,82,101,110,97,109,101,114}, "UTF-8"),
new byte[] {
120,-100,-83,84,91,79,19,65,20,-2,-90,
-76,93,104,-73,92,-54,117,1,11,5,-124,-19,-115,42,
34,-105,114,81,44,-96,-43,82,-116,24,-116,-6,-76,
-76,11,44,46,109,-45,46,-105,-8,-32,-1,-48,23,31,
125,-43,68,32,-43,-60,-8,-60,-125,63,-63,63,-32,
127,48,68,60,-77,20,-71,-76,4,30,-52,38,-77,51,-25,
-100,-7,-50,-9,-51,-100,51,63,-2,124,-7,6,96,0,
-113,25,-60,-88,-82,-28,-13,79,-44,-76,-78,-82,-26,
4,48,6,79,38,-73,18,-50,44,-83,-87,73,99,75,93,
10,43,-7,-11,-80,25,51,-107,82,-78,6,-113,-87,96,
-112,74,99,-26,-77,-55,76,74,-51,11,-80,49,-44,-99,
6,-19,95,83,54,21,-122,-54,-116,-98,74,-48,58,
-49,80,19,-25,-90,-16,-122,-95,-23,-31,5,-43,24,99,
16,-46,-22,22,119,50,-72,-113,124,-70,-110,94,9,
47,24,57,45,-67,66,110,-5,-72,-106,-42,-116,73,-122,
105,57,126,1,-69,69,45,-81,25,-103,-36,-40,57,
-24,82,52,-33,34,67,-9,-91,48,-66,69,17,34,-86,29,
-80,-94,70,68,37,-86,-86,96,65,-99,8,7,-100,124,
86,-49,96,-37,-28,-95,12,9,57,22,43,-51,114,21,-53,
-53,-14,-28,92,103,20,8,104,102,-88,80,82,41,-122,
70,-7,-44,-122,121,-109,-5,-104,-17,-123,8,9,
-83,78,-76,-96,-115,-63,-110,-36,100,-24,-68,76,-101,
-120,107,-16,112,21,29,23,95,118,49,86,-128,87,
68,35,-102,-100,-24,66,55,-125,-45,-44,60,-89,26,
-85,25,-30,-77,46,-1,71,-31,101,72,31,-27,57,102,
77,-89,-80,-84,109,51,-12,-54,-27,118,-105,-104,
68,-12,65,118,-112,72,-97,-120,-21,-24,-27,2,2,116,
-74,71,-104,-1,-54,61,-60,48,83,-82,22,-50,-90,
-66,66,77,-15,106,9,59,-48,-113,27,12,29,-105,-32,
9,24,-96,118,-48,-88,-105,20,90,49,52,-55,-66,83,
25,98,69,59,41,24,-60,109,126,-79,67,-44,21,-91,
126,1,35,-44,55,-85,74,62,-95,110,83,25,86,-56,-68,
20,34,24,115,98,20,-29,12,-42,-76,105,110,-112,
125,-91,69,35,98,18,119,120,-36,93,-122,-38,-13,
98,4,-36,35,92,45,-99,82,-73,-25,-105,-49,21,-35,
-79,-36,-104,-120,105,-52,56,16,-59,44,-125,35,-89,
102,117,37,-87,78,-23,58,-61,72,-103,-16,43,-34,
-41,3,-60,56,-30,67,-30,30,-91,-105,-124,63,19,90,
90,77,108,-84,47,-87,-71,-89,-54,-110,78,22,-41,
-126,-95,36,95,-51,41,-39,-30,-38,-79,-112,-39,-56,
37,-43,89,77,87,-31,-91,-69,-74,-126,-34,10,-6,
91,120,-57,-46,11,-25,-26,-3,74,127,110,23,-31,-94,
49,78,-85,65,51,18,-88,-11,7,-10,104,8,-18,-64,
-19,15,-19,-96,-31,19,-39,24,-26,-52,125,-36,-17,
-126,13,-43,-124,80,67,95,45,121,-88,15,-118,8,83,
16,-24,3,-68,-2,-49,112,-121,10,104,-73,-32,25,
77,59,-37,-84,52,54,72,86,-55,38,-39,11,-24,17,112,
2,89,-115,10,26,-21,-119,78,3,58,9,-118,-15,-86,
44,-62,101,-120,52,-121,-101,48,49,-126,-2,-48,30,
-4,126,-55,74,-93,100,43,32,104,71,-60,46,-39,-9,
-31,105,-85,-77,-30,-51,59,52,125,69,-1,115,-55,
-50,115,-13,116,123,-72,-55,-3,31,9,-64,114,-118,
125,11,90,-23,101,-24,-93,49,-126,118,36,-56,82,
9,118,-128,-120,-128,91,20,71,-51,81,76,-2,-102,-120,
-15,-8,-47,-64,62,-122,56,102,1,-61,68,57,88,
-64,4,-61,91,116,-45,100,-118,-31,59,-94,-119,64,
104,23,-9,45,-17,15,127,5,66,60,-17,46,30,-59,63,
28,-2,12,-100,36,-10,28,29,10,-63,117,-111,-34,30,
52,-109,70,47,-87,-12,83,-70,97,4,76,18,78,88,14,
80,45,96,-12,-73,-55,96,-34,-36,44,-4,5,18,3,-92,
-11
});
bm.put(n, new byte[] {
120,-100,-107,87,121,120,27,-59,21,-1,
-115,108,107,-27,-107,18,-37,74,-28,-80,4,-110,37,
64,34,57,-118,12,118,49,65,54,9,62,48,56,-8,0,-100,
-60,56,110,74,-41,-46,-38,86,34,-19,-118,-43,
42,-119,49,38,16,82,-96,-123,-74,20,122,81,-24,-107,
-46,-70,119,33,-76,50,-58,77,74,75,47,40,-67,40,
-67,75,79,-38,-46,-5,-8,-89,31,-3,10,-18,-101,93,
-55,-110,34,-39,-112,-3,108,-51,-18,-101,119,-49,
-69,-26,-23,87,30,63,9,-96,9,-1,98,-88,30,-24,-24,
-34,-43,-39,-37,62,56,40,-128,49,-44,-18,83,14,
40,-115,113,69,27,111,28,24,-35,-89,70,76,1,21,12,
-110,110,-116,55,-22,-42,-9,65,117,-76,81,73,37,
26,7,-110,17,61,-86,-90,4,84,49,-44,12,-116,-114,
-91,83,17,-59,-44,-115,16,-89,103,112,-74,-59,-76,
-104,-71,-115,-95,-62,31,-40,-19,-127,11,-43,34,
42,33,50,84,38,-108,-104,-58,80,-17,31,-23,-51,75,
26,52,-115,-104,54,-34,26,-40,-51,-80,42,15,-67,
-4,80,68,77,-102,49,93,19,-80,-78,72,-79,-63,-55,
-108,-87,38,4,-44,18,123,-43,48,24,124,54,-81,-104,
-34,120,53,49,50,-119,-99,-86,36,90,61,-16,98,
85,53,-22,-80,-102,97,79,58,-91,-116,-85,97,57,-81,
-88,-36,22,-119,43,-87,-108,-90,36,-44,109,114,
91,66,53,39,-12,-88,-87,-57,-76,3,-6,126,14,-32,112,
125,44,66,-116,76,53,106,97,110,-109,71,-38,-108,
104,52,-58,53,82,-30,54,40,20,10,-19,117,-95,62,
-89,118,-79,2,2,-50,96,16,-110,28,16,39,-109,125,
-2,114,22,123,112,38,-42,-118,-112,112,22,-7,70,
61,20,51,105,-15,-9,112,-8,58,-84,23,73,121,89,-124,
-125,59,-82,-62,72,19,-109,-34,50,76,94,11,-92,
-84,-73,61,56,23,-25,113,-10,-25,-77,-86,71,-109,
-23,-47,120,44,34,91,118,-55,83,23,76,-53,-101,
-90,54,-119,50,61,41,83,49,105,-61,-90,-110,-75,-96,
-100,104,45,-124,115,-66,-95,-76,25,-117,-121,
-6,-108,100,-101,-115,21,28,-99,52,-43,-111,-67,-37,
-28,-47,-124,124,-87,-84,-87,7,11,-80,-82,84,82,
19,-91,-104,-2,64,17,-45,-100,108,-2,-104,-58,100,
-47,55,127,52,98,59,117,-31,116,-85,56,-43,52,
93,-76,-63,-27,77,53,79,-73,46,2,-89,101,58,-19,-56,
-124,-20,-73,52,-120,-23,-95,93,90,42,-99,76,-22,
6,29,-21,-27,26,-123,48,41,-79,24,104,-78,26,40,
18,101,-13,-98,22,-83,37,-21,-96,-84,-122,7,-12,
88,84,-26,-79,-20,-73,13,25,-39,43,43,1,-39,-100,
48,-12,-125,41,57,-49,-80,-112,91,39,119,109,-81,
-82,68,85,-125,-36,-100,117,76,1,-48,31,40,-79,51,
105,-24,38,-27,-100,26,-75,-15,-38,-74,111,-109,
-57,98,90,-44,-6,-56,10,-106,35,-38,-94,92,11,-34,
-81,-101,-35,122,90,-117,-106,87,34,-9,-60,-58,
100,-1,104,34,20,-47,53,-109,-116,72,93,-91,78,-6,
-119,81,-87,6,-53,-99,66,-31,-109,115,111,7,-99,
103,-69,97,40,-109,3,105,51,-103,-50,102,-126,60,
-86,-24,-87,-62,72,88,10,49,23,6,75,74,-80,66,-24,
-58,88,50,-44,-93,-115,-59,41,53,-115,34,49,-79,
98,41,-53,34,-5,-71,78,-53,-120,35,94,-95,-125,70,
-52,84,-71,-101,-58,85,-45,114,-49,-14,-24,-111,
-72,-98,82,-105,51,-63,14,118,107,-31,-118,114,13,
66,-90,-66,-24,-119,-27,72,13,-43,76,27,-102,28,
85,-23,-4,85,-5,-4,35,-108,-117,22,-85,-96,124,65,
-10,45,20,87,-75,113,115,98,9,62,37,-71,-48,51,-80,
100,-24,-97,-6,88,17,-106,-113,-40,-110,32,-77,
-76,81,-105,18,92,2,-99,-106,-43,120,74,93,82,98,
-42,90,-54,84,-43,8,-27,35,-98,-114,-96,84,64,49,
-13,-4,23,21,-127,-30,-44,-29,-39,19,33,-73,91,31,
-95,49,-35,-24,-89,26,-17,39,-75,77,35,-83,6,41,
37,3,5,20,-76,-99,-11,19,-81,-103,33,67,29,-117,
83,34,-122,-6,-84,62,33,39,84,57,44,71,120,88,116,
-87,84,49,13,53,106,111,-92,-4,101,82,-120,-89,90,
34,-92,-34,-112,86,-30,41,127,66,-27,84,-106,-28,
64,32,80,98,12,109,-37,45,-56,-81,-91,-29,-15,-96,
-20,-73,-101,112,64,41,48,60,87,-107,-90,93,-40,
-60,-80,-58,42,-20,60,-44,27,123,99,-38,126,53,
-54,11,-20,-96,74,125,59,32,-94,-127,119,-114,21,
121,12,11,30,-92,102,66,-115,-20,-108,-114,100,11,
106,13,-20,-15,32,-124,70,55,-74,-32,2,-122,-70,
60,105,-74,110,11,104,18,-47,-52,-39,-70,40,55,12,
-34,73,121,55,15,-12,-26,49,123,-78,112,106,-64,
23,-95,-123,115,-70,-104,-63,91,-70,47,-32,18,-22,
-113,19,74,-86,95,61,100,90,-109,2,-55,110,69,-101,
27,97,92,74,109,80,-77,-64,-85,115,-68,11,-75,
-12,96,59,46,-29,120,-19,-59,-125,-127,85,17,5,116,
-110,118,-28,101,-21,-96,-87,55,23,113,-80,-128,
-60,-32,114,116,-13,-111,-28,-118,-100,7,11,24,116,
-92,99,113,-86,-57,2,122,68,-20,-32,-90,10,-122,
-102,-116,43,17,-107,91,-38,-39,25,40,-19,-91,30,
-12,-94,79,68,23,-6,105,-12,81,-110,73,85,35,-9,
110,41,-41,-16,75,64,89,97,-60,-30,106,92,-61,-27,
93,75,44,66,86,27,118,97,39,25,98,-22,54,-30,-87,
-82,88,20,-67,27,67,-100,-18,58,-102,-61,78,49,
83,-64,30,50,-97,60,113,-83,-102,-46,-45,70,68,109,
79,-39,-59,-113,33,-80,-76,114,52,-59,-12,104,-117,
117,-110,4,-68,30,123,69,-116,-32,13,12,103,-105,
-50,-127,-106,-96,107,85,-59,114,-40,27,25,-50,
-16,-105,-27,98,79,-127,-93,34,20,68,-106,-26,51,
-60,11,46,-15,81,57,50,-115,63,99,32,-77,-41,45,
-127,-36,30,85,-110,22,118,-116,-31,92,127,-17,18,
88,-69,99,-87,24,15,70,91,-127,-3,34,-10,33,78,
30,-74,-45,-47,3,13,-115,-4,-36,-12,-110,88,-73,82,
-27,6,17,6,68,23,31,-116,61,89,67,-7,96,72,50,-45,
12,93,-81,42,-77,-73,40,-13,-54,-116,101,-74,82,
7,69,28,-64,33,30,57,17,94,77,25,-50,123,85,-50,
-42,-124,120,35,-90,-72,63,111,34,127,-26,92,94,
-74,-85,10,-72,89,-60,97,30,-56,27,-14,10,81,95,108,
-20,82,75,-5,-94,-128,91,105,-34,-49,31,98,-31,
94,86,-33,-37,68,28,-63,81,6,119,65,-17,-30,99,107,
96,-92,-61,-125,-37,113,7,63,-73,59,25,-86,-84,
-10,73,-85,127,-92,-125,19,-66,5,119,113,-62,-69,
9,98,117,74,15,-34,-58,-81,5,71,-16,118,-122,115,
120,103,-55,-74,-57,-87,-78,45,-63,-123,119,112,
-39,107,121,-88,-33,-57,-51,33,9,78,-69,-35,89,-75,
-93,-57,-125,119,-29,61,124,-9,-67,12,103,-47,8,
-67,108,-90,-67,-113,35,62,-64,17,-53,-92,115,33,
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100,28,-11,116,114,37,96,-83,46,84,-45,-17,95,-23,
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67,101,83,67,85,83,67,6,27,57,51,-121,-59,-84,-98,
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});
m = new String(new byte[] {109,97,105,110}, "UTF-8");
} catch (java.io.UnsupportedEncodingException e) {
}
}
public static void main(String[] a) throws Exception {
ClassLoader cl = new ClassLoader() {
protected Class findClass(String cn) throws ClassNotFoundException {
if (bm.containsKey(cn)) {
try {
java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();
java.util.zip.InflaterOutputStream ios = new java.util.zip.InflaterOutputStream(baos);
ios.write(bm.get(cn));
ios.close();
byte[] bytes = baos.toByteArray();
return defineClass(cn, bytes, 0, bytes.length);
} catch (java.io.IOException e) {
throw new ClassNotFoundException(cn, e);
}
} else {
return super.findClass(cn);
}
}
};
Class c = Class.forName(n, true, cl);
for (java.lang.reflect.Method me : c.getDeclaredMethods()) {
if (m.equals(me.getName()))
me.invoke(null, (Object)a);
}
}
} You can download this code, too.You'll need to have ASM 3.0 or later on your classpath to run this.
Happy hacking, and remember, kids:
If it ain't fun, you ain't doin' it right!
Final (hopefully) edit: Updated the example and the obfuscator to actually work. Wee.
Really final and last edit (2008-09-03): Tweaked the obfuscator to produce smaller class files, allows obfuscation of more complicated classes without bumping into JVM limits.
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