Merge pull request #12 from RUB-NDS/fixedRandom

Add a fixed random class for testing purposes [BadFixedRandom]

Author: ic0ns

src/main/java/de/rub/nds/modifiablevariable/util/BadFixedRandom.java

@@ -0,0 +1,36 @@
+/**
+ * TLS-Attacker - A Modular Penetration Testing Framework for TLS
+ *
+ * Copyright 2014-2016 Ruhr University Bochum / Hackmanit GmbH
+ *
+ * Licensed under Apache License 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+package de.rub.nds.modifiablevariable.util;
+
+import java.util.Random;
+
+/**
+ * A fake random number generator for testing. 
+ * This generator will always return the byte "retVal" passed to the constructor. 
+ * 
+ */
+public class BadFixedRandom extends Random {
+
+    byte retVal;
+
+    public BadFixedRandom(byte retVal) {
+        this.retVal = retVal;
+    }
+
+    /**
+     * Fills a user-supplied byte array with the fixed byte given at object initialization.
+     * The number of "random" bytes produced is equal to the length of the byte array.
+     */    
+    @Override
+    public void nextBytes(byte[] bytes) {
+        for (int i = 0, len = bytes.length; i < len;)
+            bytes[i++] = retVal;
+    }
+
+}