manusreload · April 4, 2015 12:38 · Apr 4, 2015
diff --git a/gistfile1.java b/gistfile1.java
@@ -0,0 +1,96 @@
+
+public class Scramble {
+    public static final int SIZE = 624;
+    int seed;
+    int[] buffer = new int[SIZE];
+    int ix = 0;
+
+
+    public Scramble(int seed) {
+        this.seed = seed;
+
+        for (int i = 0; i < 624; i++) {
+            buffer[i] = seed;
+            seed = 1812433253 * ((seed ^ (seed >> 30)) + 1) & 0xFFFFFFFF;
+        }
+    }
+
+    public byte[] getScramble(byte[] serverRandom)
+    {
+//        String result = "";
+        byte[] result = new byte[serverRandom.length];
+        byte byte100 = 0;
+        for (int i = 0; i < 100; i++) {
+            byte100 = getByte();
+        }
+        for (int i = 0; i < serverRandom.length; i++) {
+
+            byte b = (byte) (getByte() & byte100);
+            result [i] = ((byte) (serverRandom[i] ^ b));
+        }
+        return result;
+    }
+
+    private byte getByte()
+    {
+        int x = getInt();
+        if(isNeg(x))
+        {
+            x = negate(x);
+        }
+        return (byte) (x);
+    }
+    private int getInt()
+    {
+        if(ix == 0)
+        {
+            mixBuffer();
+        }
+        int val = buffer[ix];
+        ix = (ix+1) % 624;
+        val ^= (val >> 11) ^ ((val ^ (val >> 11)) << 7) & 0x9D2C5680;
+        val = (int) (((val ^ (val << 15) & 0xEFC60000) >> 18) ^ val ^ (val << 15) & 0xEFC60000);
+        return val;
+
+    }
+
+    private void mixBuffer()
+    {
+//        while i<624:
+//            i += 1
+//            v4= (self.buffer[i%624] & 0x7FFFFFFF) + (self.buffer[j]&0x80000000)
+//            v6 = rshift(v4,1) ^ self.buffer[(i+396)%624]
+//            if v4&1:
+//                v6 ^= 0x9908B0DF
+//            self.buffer[j] = v6
+//            j += 1
+        for (int i = 1, j = 0; i <= SIZE; i++, j++) {
+            int v4 = (buffer[i % SIZE] & 0x7FFFFFFF) + (buffer[j] & 0x80000000);
+            int v6 = (v4 >> 1) ^ buffer[(i + 396) % 624];
+            if( (v4 & 1) == 1 )
+            {
+                v6 ^= 0x9908B0DF;
+            }
+            buffer[j] = v6;
+        }     
+
+    }
+    private void dumpbuffer()
+    {
+        for (int c : buffer) {
+            System.out.println(String.format("%08x", c));
+        }
+    }
+
+    private boolean isNeg(int number)
+    {
+        return Integer.signum(number) == -1;
+    }
+
+    private int negate(int number)
+    {
+        return Integer.reverse(number) >> 8;
+    }
+
+
+}