From d33c7d31d00fb47c0b1412dff2d1a2d47418615a Mon Sep 17 00:00:00 2001
From: Paul <poggel.paul@gmail.com>
Date: Sun, 18 Oct 2020 13:48:50 +0200
Subject: [PATCH] inital commit

---
 .idea/.gitignore                              |   8 +
 .idea/artifacts/AES_CTR_jar.xml               |  11 +
 .idea/description.html                        |   1 +
 .idea/encodings.xml                           |   6 +
 .idea/misc.xml                                |  12 +
 .idea/modules.xml                             |   8 +
 .idea/project-template.xml                    |   3 +
 AES_CTR.iml                                   |  12 +
 AES_CTR.jar                                   | Bin 0 -> 7634 bytes
 META-INF/MANIFEST.MF                          |   3 +
 Readme.txt                                    |   4 +
 out/artifacts/AES_CTR_jar/AES_CTR.jar         | Bin 0 -> 7634 bytes
 .../tech/loedige/AdditiveStreamCipher.class   | Bin 0 -> 646 bytes
 .../tech/loedige/KeyStreamGenerator.class     | Bin 0 -> 343 bytes
 .../loedige/KeyStreamGenerator_AES_CTR.class  | Bin 0 -> 2166 bytes
 .../AES_CTR/tech/loedige/Main.class           | Bin 0 -> 1944 bytes
 out/production/AES_CTR/util/Dump.class        | Bin 0 -> 5431 bytes
 .../util/IllegalHexDumpException.class        | Bin 0 -> 380 bytes
 src/tech/loedige/AdditiveStreamCipher.java    |  10 +
 src/tech/loedige/KeyStreamGenerator.java      |  12 +
 .../loedige/KeyStreamGenerator_AES_CTR.java   |  64 ++++++
 src/tech/loedige/Main.java                    |  33 +++
 src/util/Dump.java                            | 215 ++++++++++++++++++
 src/util/IllegalHexDumpException.java         |  15 ++
 24 files changed, 417 insertions(+)
 create mode 100644 .idea/.gitignore
 create mode 100644 .idea/artifacts/AES_CTR_jar.xml
 create mode 100644 .idea/description.html
 create mode 100644 .idea/encodings.xml
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 .idea/project-template.xml
 create mode 100644 AES_CTR.iml
 create mode 100644 AES_CTR.jar
 create mode 100644 META-INF/MANIFEST.MF
 create mode 100644 Readme.txt
 create mode 100644 out/artifacts/AES_CTR_jar/AES_CTR.jar
 create mode 100644 out/production/AES_CTR/tech/loedige/AdditiveStreamCipher.class
 create mode 100644 out/production/AES_CTR/tech/loedige/KeyStreamGenerator.class
 create mode 100644 out/production/AES_CTR/tech/loedige/KeyStreamGenerator_AES_CTR.class
 create mode 100644 out/production/AES_CTR/tech/loedige/Main.class
 create mode 100644 out/production/AES_CTR/util/Dump.class
 create mode 100644 out/production/AES_CTR/util/IllegalHexDumpException.class
 create mode 100644 src/tech/loedige/AdditiveStreamCipher.java
 create mode 100644 src/tech/loedige/KeyStreamGenerator.java
 create mode 100644 src/tech/loedige/KeyStreamGenerator_AES_CTR.java
 create mode 100644 src/tech/loedige/Main.java
 create mode 100644 src/util/Dump.java
 create mode 100644 src/util/IllegalHexDumpException.java

diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..4aa91ea
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/artifacts/AES_CTR_jar.xml b/.idea/artifacts/AES_CTR_jar.xml
new file mode 100644
index 0000000..6dea945
--- /dev/null
+++ b/.idea/artifacts/AES_CTR_jar.xml
@@ -0,0 +1,11 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="AES_CTR:jar">
+    <output-path>$PROJECT_DIR$/out/artifacts/AES_CTR_jar</output-path>
+    <root id="archive" name="AES_CTR.jar">
+      <element id="directory" name="META-INF">
+        <element id="file-copy" path="$PROJECT_DIR$/META-INF/MANIFEST.MF" />
+      </element>
+      <element id="module-output" name="AES_CTR" />
+    </root>
+  </artifact>
+</component>
\ No newline at end of file
diff --git a/.idea/description.html b/.idea/description.html
new file mode 100644
index 0000000..db5f129
--- /dev/null
+++ b/.idea/description.html
@@ -0,0 +1 @@
+<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>
\ No newline at end of file
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..ab2dc53
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..a81c43e
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="EntryPointsManager">
+    <entry_points version="2.0" />
+  </component>
+  <component name="ProjectKey">
+    <option name="state" value="project://e2804f05-5315-4fc6-a121-c522a6c26470" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_14" default="true" project-jdk-name="14" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..48bd1d6
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/AES_CTR.iml" filepath="$PROJECT_DIR$/AES_CTR.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/project-template.xml b/.idea/project-template.xml
new file mode 100644
index 0000000..d57a956
--- /dev/null
+++ b/.idea/project-template.xml
@@ -0,0 +1,3 @@
+<template>
+  <input-field default="com.company">IJ_BASE_PACKAGE</input-field>
+</template>
\ No newline at end of file
diff --git a/AES_CTR.iml b/AES_CTR.iml
new file mode 100644
index 0000000..bcd2974
--- /dev/null
+++ b/AES_CTR.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
+
diff --git a/AES_CTR.jar b/AES_CTR.jar
new file mode 100644
index 0000000000000000000000000000000000000000..6026378e3610f68a8f05edcdec90f205ef1f8f09
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diff --git a/META-INF/MANIFEST.MF b/META-INF/MANIFEST.MF
new file mode 100644
index 0000000..74bc389
--- /dev/null
+++ b/META-INF/MANIFEST.MF
@@ -0,0 +1,3 @@
+Manifest-Version: 1.0
+Main-Class: tech.loedige.Main
+
diff --git a/Readme.txt b/Readme.txt
new file mode 100644
index 0000000..c76d688
--- /dev/null
+++ b/Readme.txt
@@ -0,0 +1,4 @@
+Name: 		Paul Lödige
+Matrikel Nr.:	15405036
+
+Projekt als ausführbare jar-Datei vorhanden
\ No newline at end of file
diff --git a/out/artifacts/AES_CTR_jar/AES_CTR.jar b/out/artifacts/AES_CTR_jar/AES_CTR.jar
new file mode 100644
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diff --git a/out/production/AES_CTR/tech/loedige/AdditiveStreamCipher.class b/out/production/AES_CTR/tech/loedige/AdditiveStreamCipher.class
new file mode 100644
index 0000000000000000000000000000000000000000..86b6bd9f6c46514b94cd5599b0cb05e2db8a4d3b
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/out/production/AES_CTR/tech/loedige/KeyStreamGenerator.class b/out/production/AES_CTR/tech/loedige/KeyStreamGenerator.class
new file mode 100644
index 0000000000000000000000000000000000000000..e7a589a440b4226025504a20e7afce4499d9ea63
GIT binary patch
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diff --git a/out/production/AES_CTR/tech/loedige/KeyStreamGenerator_AES_CTR.class b/out/production/AES_CTR/tech/loedige/KeyStreamGenerator_AES_CTR.class
new file mode 100644
index 0000000000000000000000000000000000000000..9fd7c973945cb076a521e668d4ee9f03584790b8
GIT binary patch
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literal 0
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diff --git a/out/production/AES_CTR/tech/loedige/Main.class b/out/production/AES_CTR/tech/loedige/Main.class
new file mode 100644
index 0000000000000000000000000000000000000000..1ac6fbb9850ed6fc218bf87c5d3c35b93fe38726
GIT binary patch
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literal 0
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diff --git a/out/production/AES_CTR/util/Dump.class b/out/production/AES_CTR/util/Dump.class
new file mode 100644
index 0000000000000000000000000000000000000000..515d45c81db52a52275e54311faeda2261e5cb8c
GIT binary patch
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zwCpZ&>^5>qddwfIkfNl-NIoo|v6S1K?4MNbca#U@TalybA!-svuPc85UU!4Qv|QlH
z<FNb?O5zoxxNVztyb;2z?`gy`mqZU{(!=&HVt19WpGui`>8tt7s#GJ!w=?)VabDHo
zWkx7JbykENxhXFMVaGZR?xGJ66mB@l6DELH@T%kMe`rn$dabWf{2ap<+K*$u_;jb;
zNwE`$urxx*hS^n_gD9TB_M-5YJkP<^>1G=(9>+Z$qd2&YopR*VYZD@8M;Bw2VAbGd
z-n~Ljd6g&fYpBKRJotWwHGFO(`ZnX|R-|%9mlDl3is&X~U#A8avG`M~szH*i9qCM5
zP7QA``BL9GaG&B<uMcnXoF?Y>69MHX**AXbo|ud3tdax8;fKOs9mk=kF(T8EvIY$s
wT+^BC5;`kSzpzaI62IbSIoE$p$=_SoKU&v!tn0h@E8hqC?r-=9{)Mvt0@fA@O#lD@

literal 0
HcmV?d00001

diff --git a/out/production/AES_CTR/util/IllegalHexDumpException.class b/out/production/AES_CTR/util/IllegalHexDumpException.class
new file mode 100644
index 0000000000000000000000000000000000000000..f6d121818ab000fd654f040c3ebcd60c3d44a367
GIT binary patch
literal 380
zcmaJ-%Sr=55UgI;U0tJz3wjEIo_v708wrRH6c#U$+$Za>j?B)6aYpi6o&*p106$9X
z(TJj8ADXVBsP3-Ux0e}!Bjgz(ETo8ASVThDxfhS3r-i9{S6a(T=o4G{S{ipgE#<_i
z#t@QYWt1BbHg=0|{m@xus{Y<6#S)?Gozh<(mvVaM>&Xv`__Vo|gm$5fy!Q22+8Z&}
z%;ZH=3Oy251w1EXcc&f*Tg88-eFCv4|9cW48#dmS@<N3b-T7y~uR09BU>hk%5{mso
uDBPDB4VVplvVZUldg3WU#ytcGtg><qD?Dv}s?cICRKk4w!>hw6!umVC_**3a

literal 0
HcmV?d00001

diff --git a/src/tech/loedige/AdditiveStreamCipher.java b/src/tech/loedige/AdditiveStreamCipher.java
new file mode 100644
index 0000000..f445b56
--- /dev/null
+++ b/src/tech/loedige/AdditiveStreamCipher.java
@@ -0,0 +1,10 @@
+package tech.loedige;
+
+public class AdditiveStreamCipher {
+
+    static public void encrypt(KeyStreamGenerator ksg, byte[] m) {
+        for (int i = 0; i < m.length; ++i) {
+            m[i] ^= ksg.getNextKeyStreamByte(m[i]);
+        }
+    }
+}
diff --git a/src/tech/loedige/KeyStreamGenerator.java b/src/tech/loedige/KeyStreamGenerator.java
new file mode 100644
index 0000000..6d813bc
--- /dev/null
+++ b/src/tech/loedige/KeyStreamGenerator.java
@@ -0,0 +1,12 @@
+package tech.loedige;
+
+public abstract class KeyStreamGenerator {
+    /**
+    * Berechnung des nächsten Schlüsselstrombytes.
+     * (Entspricht einem einmaligen Aufruf der
+     * Update-Funktion s und der Extraktions-Funktion S.)
+     *
+     * @return Nächstes Schlüsselstrombyte
+     */
+    abstract byte getNextKeyStreamByte(byte mByte);
+}
diff --git a/src/tech/loedige/KeyStreamGenerator_AES_CTR.java b/src/tech/loedige/KeyStreamGenerator_AES_CTR.java
new file mode 100644
index 0000000..3d1bf53
--- /dev/null
+++ b/src/tech/loedige/KeyStreamGenerator_AES_CTR.java
@@ -0,0 +1,64 @@
+package tech.loedige;
+
+import javax.crypto.*;
+import javax.crypto.spec.SecretKeySpec;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+
+public class KeyStreamGenerator_AES_CTR extends KeyStreamGenerator {
+
+    private Cipher cipher;
+    private final byte[] state = new byte[16];
+    private final byte[] ctr = new byte[16];
+    private int currentByte=0;
+
+    public void initState(byte[] key, byte[] iv)
+            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
+        if((iv.length!=16)||(key.length!=16)){
+            throw new IllegalArgumentException("Invalid input length");
+        }
+        System.arraycopy(iv,0,ctr,0,16);
+
+        SecretKey secretKey = new SecretKeySpec(key,"AES");
+        cipher = Cipher.getInstance("AES/ECB/NOPADDING");
+        cipher.init(Cipher.ENCRYPT_MODE,secretKey);
+
+        System.arraycopy(cipher.doFinal(ctr),0,state,0,16);
+    }
+
+    @Override
+    byte getNextKeyStreamByte(byte mByte) {
+        if(currentByte>=16){
+            try {
+                updateStateBlock();
+            } catch (BadPaddingException | IllegalBlockSizeException e) {
+                e.printStackTrace();
+            }
+            currentByte=0;
+        }
+        return state[currentByte++];
+    }
+
+    private void updateStateBlock()
+            throws BadPaddingException, IllegalBlockSizeException {
+        incrementCtr();
+        System.arraycopy(cipher.doFinal(ctr),0,state,0,16);
+    }
+
+    /**
+     * inkrementiert den counter
+     */
+    private void incrementCtr(){
+        for(int i = 0; i<16; i++){
+            //falls das Byte die volle Länge erreicht hat findet ein Übertrag statt
+            if(ctr[i]==0xff){
+                ctr[i]=0x00;
+            }
+            else{
+                //falls das Byte nicht die volle Länge hat endet die Inkrementierung
+                ctr[i]++;
+                return;
+            }
+        }
+    }
+}
diff --git a/src/tech/loedige/Main.java b/src/tech/loedige/Main.java
new file mode 100644
index 0000000..1e7e567
--- /dev/null
+++ b/src/tech/loedige/Main.java
@@ -0,0 +1,33 @@
+package tech.loedige;
+
+import util.Dump;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+
+public class Main {
+
+    public static void main(String[] args)
+            throws Exception {
+        byte[] key = Dump.hexString2byteArray("0102030405060708090A0B0C0D0E0F10");
+        SecretKey secretKey = new SecretKeySpec(key, "AES");
+        Cipher cipher= Cipher.getInstance("AES/CTR/NOPADDING");
+        byte[] ctr = Dump.hexString2byteArray("FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE");
+        IvParameterSpec iv = new IvParameterSpec(ctr);
+        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
+        byte[] m = new byte[35];
+        byte[] c = cipher.doFinal(m);
+        System.out.println("AES-CTR-Verschlüsselung mit "+
+                "Cipher-Instanz vom Typ AES/CTR/NOPADDING:");
+        System.out.println(Dump.dump(c));
+        System.out.println();
+        KeyStreamGenerator_AES_CTR ksg= new KeyStreamGenerator_AES_CTR();
+        ksg.initState(key, ctr);
+        AdditiveStreamCipher.encrypt(ksg, m);
+        System.out.println("AES-CTR-Verschlüsselung mit "+ "KeyStreamGenerator_AES_CTR-Implementierung:");
+        System.out.println(Dump.dump(m));
+        System.out.println();
+    }
+}
\ No newline at end of file
diff --git a/src/util/Dump.java b/src/util/Dump.java
new file mode 100644
index 0000000..2aec87d
--- /dev/null
+++ b/src/util/Dump.java
@@ -0,0 +1,215 @@
+/*
+ * Stefan Heiss
+ * TH Ostwestfalen-Lippe
+ * FB Elektrotechnik und Technische Informatik
+ * Quellcode zur Lehrveranstaltung Datensicherheit
+ */
+package util;
+
+import java.math.BigInteger;
+import java.util.Formatter;
+
+public class Dump {
+
+    public final static String NL
+            = System.getProperty("line.separator", "\r\n");
+
+    public static byte[] hexString2byteArray(
+            String hexString) {
+        // remove all whitespaces
+        hexString = hexString.replaceAll("\\s", "");
+        hexString = hexString.replaceAll(":", "");
+
+        if ((hexString.length() & 0x01) != 0) {
+            throw new IllegalHexDumpException(
+                    "Odd number of nibbles!");
+        }
+        int byteArrayLength = hexString.length() >> 1;
+        byte[] ba = new byte[byteArrayLength];
+        for (int i = 0; i < byteArrayLength; ++i) {
+            try {
+                ba[i]
+                        = (byte) Integer.parseInt(
+                        hexString.substring(2 * i, 2 * i + 2), 16);
+            } catch (NumberFormatException nfe) {
+                throw new IllegalHexDumpException(
+                        "Invalid characters "
+                                + hexString.substring(2 * i, 2 * i + 2)
+                                + " at position " + 2 * i
+                                + " (of streamlined string)!");
+            }
+        }
+        return ba;
+    }
+
+    // ------------------------------------------------------
+    public static String dumpString(int i) {
+        String retString = Integer.toString(i, 16);
+        if ((retString.length() & 0x01) != 0) {
+            retString = "0" + retString;
+        }
+
+        return retString.toUpperCase();
+    }
+
+    public static String dumpString(byte b) {
+        return dumpString(b & 0xff);
+    }
+
+    public static String dumpString(byte[] data) {
+        return dumpString(data, 0, data.length);
+    }
+
+    public static String dumpString(
+            byte[] data, int offset, int length) {
+        return dumpString(data, "", offset, length);
+    }
+
+    public static String dumpString(
+            byte[] data, String interBytesString,
+            int offset, int length) {
+        if (offset < 0 || length < 0) {
+            throw new IllegalArgumentException(
+                    "Values for offset and parameters must be "
+                            + "non-negative!");
+        }
+        if (data == null) {
+            if (offset > 0 || length > 0) {
+                throw new IllegalArgumentException(
+                        "Specified range not available in data!");
+            }
+            return "";
+        }
+        if ((offset + length) > data.length) {
+            throw new IllegalArgumentException(
+                    "Specified range not available in data!");
+        }
+
+        StringBuffer sb = new StringBuffer(length
+                * (2 + interBytesString.length()));
+        for (int i = offset; i < offset + length; ++i) {
+            if (i != 0) {
+                sb.append(interBytesString);
+            }
+            sb.append(dumpString(data[i]));
+        }
+        return new String(sb);
+    }
+
+    // ------------------------------------------------------
+    public static String dump(BigInteger b) {
+        byte[] data = b.toByteArray();
+        int l = data.length;
+        if (l > 1 && data[0] == 0) {
+            System.arraycopy(data, 1, data, 0, --l);
+        }
+        return dump(data, l);
+    }
+
+    public static String dump(byte[] data) {
+        return dump(data, data.length);
+    }
+
+    public static String dump(byte[] data, int length) {
+        StringBuffer sb
+                = new StringBuffer(78 * ((length + 15) >> 4));
+        char[] txt = new char[16];
+
+        int i = 0;
+        for (; i < length;) {
+            if ((i & 0x0f) == 0) {
+                sb.append(alignRight(
+                        Integer.toHexString(i) + "   ", 9, '0'));
+            }
+
+            int temp = (0xff & data[i]);
+            sb.append(dumpString(temp));
+            sb.append(" ");
+
+            if (temp < 0x20 || temp > 0x7e) /// ???
+            {
+                txt[i++ & 0x0f] = '.';
+            } //      if( temp == 0x0a || temp == 0x09 || temp == 0x0d ) /// ???
+            //        txt[i++ & 0x0f] = (char)0;
+            else {
+                txt[i++ & 0x0f] = (char) temp;
+            }
+
+            if ((i & 0x0f) == 0) {
+                sb.append("   ");
+                sb.append(txt, 0, 16);
+                sb.append(NL);
+            }
+        }
+
+        if (i == 0) // empty data
+        {
+            sb.append("000000   ");
+        }
+
+        if ((i = (i & 0x0f)) != 0) {
+            sb.append(fillString(3 * (16 - i), ' ') + "   ");
+            sb.append(txt, 0, i);
+            sb.append(NL);
+        }
+
+        return new String(sb.toString().trim());
+    }
+
+    /**
+     * @return If str.length() < totalLength, a String of
+     * length totalLength is returned. (The original String
+     * extended by specified character from the left.)
+     */
+    public static String alignRight(
+            String str, int totalLength, char fillChar) {
+        if (totalLength <= str.length()) {
+            return str;
+        }
+        return fillString(totalLength - str.length(), fillChar)
+                + str;
+    }
+
+    /**
+     * @return If str.length() < totalLength, a String of
+     * length totalLength is returned. (The original String
+     * extended by space characters from the left.)
+     */
+    public static String alignRight(
+            String str, int totalLength) {
+        return alignRight(str, totalLength, ' ');
+    }
+
+    /**
+     * @return A String of repLength many repetitions of
+     * specified character.
+     */
+    public static String fillString(
+            int spaceLength, char fillChar) {
+        if (spaceLength < 0) {
+            spaceLength = 0;
+        }
+        StringBuffer sb = new StringBuffer(spaceLength);
+        for (int i = 0; i < spaceLength; ++i) {
+            sb.append(fillChar);
+        }
+        return new String(sb);
+    }
+
+    // ------------------------------------------------------
+    public static String dumpIntArray(int[] array) {
+        int nosPerLine = 4;
+        StringBuffer sb = new StringBuffer();
+        Formatter formatter = new Formatter(sb);
+        for (int i = 0; i < array.length; ++i) {
+            if (i != 0 && i % nosPerLine == 0) {
+                sb.append(NL);
+            }
+            formatter.format("  %08x", array[i]);
+        }
+        sb.append(NL);
+        return new String(sb);
+    }
+}
+
+
diff --git a/src/util/IllegalHexDumpException.java b/src/util/IllegalHexDumpException.java
new file mode 100644
index 0000000..4e26cdf
--- /dev/null
+++ b/src/util/IllegalHexDumpException.java
@@ -0,0 +1,15 @@
+/*
+ * Stefan Heiss
+ * TH Ostwestfalen-Lippe
+ * FB Elektrotechnik und Technische Informatik
+ * Quellcode zur Lehrveranstaltung Datensicherheit
+ */
+package util;
+
+public class IllegalHexDumpException
+        extends IllegalArgumentException {
+
+    public IllegalHexDumpException(String s) {
+        super(s);
+    }
+}