Cryptography Tutorials - Herong's Tutorial Examples - Version 5.36, by Dr. Herong Yang
Java Implementation of DES - Test Cases
This section provides two test cases for the Java implementation of DES algorithm, CipherDES.java.
Once I got my DES implementation working, I created the following testing Java program to performed several test cases so that I can validate the results with other DES implementations:
/* CipherDesTest.java #- Copyright (c) 2013, HerongYang.com, All Rights Reserved. */ import java.io.*; import herong.CipherDES; class CipherDesTest { public static void main(String[] a) { if (a.length<1) { System.out.println("Usage:"); System.out.println("java CipherDesTest 1"); return; } String test = a[0]; try { byte[] theKey = null; byte[] theMsg = null; byte[] theExp = null; if (test.equals("1")) { theKey = hexToBytes("133457799BBCDFF1"); theMsg = hexToBytes("0123456789ABCDEF"); theExp = hexToBytes("85E813540F0AB405"); } else if (test.equals("2")) { theKey = hexToBytes("38627974656B6579"); // "8bytekey" theMsg = hexToBytes("6D6573736167652E"); // "message." theExp = hexToBytes("7CF45E129445D451"); } else { System.out.println("Usage:"); System.out.println("java CipherDesTest 1"); return; } byte[][] subKeys = CipherDES.getSubkeys(theKey); byte[] theCph = CipherDES.cipher(theMsg,subKeys,"encrypt"); System.out.println("Key : "+bytesToHex(theKey)); System.out.println("Message : "+bytesToHex(theMsg)); System.out.println("Cipher : "+bytesToHex(theCph)); System.out.println("Expected: "+bytesToHex(theExp)); } catch (Exception e) { e.printStackTrace(); return; } } public static byte[] hexToBytes(String str) { if (str==null) { return null; } else if (str.length() < 2) { return null; } else { int len = str.length() / 2; byte[] buffer = new byte[len]; for (int i=0; i<len; i++) { buffer[i] = (byte) Integer.parseInt( str.substring(i*2,i*2+2),16); } return buffer; } } public static String bytesToHex(byte[] data) { if (data==null) { return null; } else { int len = data.length; String str = ""; for (int i=0; i<len; i++) { if ((data[i]&0xFF)<16) str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF); else str = str + java.lang.Integer.toHexString(data[i]&0xFF); } return str.toUpperCase(); } } }
Note that this program, CipherDesTest.java, can be easily modified to add other testing cases. To run CipherDesTest.java, you need compile CipherDES.java into a package called "herong", and run them together.
Case 1 - Taken from The DES Algorithm Illustrated:
java -cp . CipherDesTest 1 Key : 133457799BBCDFF1 Message : 0123456789ABCDEF Cipher : 85E813540F0AB405 Expected: 85E813540F0AB405
Case 2 - Modified from DES Source Code:
java -cp . CipherDesTest 2 Key : 38627974656B6579 Message : 6D6573736167652E Cipher : 7CF45E129445D451 Expected: 7CF45E129445D451
Table of Contents
Introduction to AES (Advanced Encryption Standard)
DES Algorithm - Illustrated with Java Programs
►DES Algorithm Java Implementation
CipherDES.java - A Java Implementation of DES
►Java Implementation of DES - Test Cases
DES Algorithm - Java Implementation in JDK JCE
DES Encryption Operation Modes
PHP Implementation of DES - mcrypt
Blowfish - 8-Byte Block Cipher
Secret Key Generation and Management
Cipher - Secret Key Encryption and Decryption
RSA Implementation using java.math.BigInteger Class
Introduction of DSA (Digital Signature Algorithm)
Java Default Implementation of DSA
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Cipher - Public Key Encryption and Decryption
OpenSSL Introduction and Installation
OpenSSL Generating and Managing RSA Keys
OpenSSL Generating and Signing CSR
OpenSSL Validating Certificate Path
"keytool" and "keystore" from JDK
"OpenSSL" Signing CSR Generated by "keytool"
Migrating Keys from "keystore" to "OpenSSL" Key Files
Certificate X.509 Standard and DER/PEM Formats
Migrating Keys from "OpenSSL" Key Files to "keystore"
Using Certificates in IE (Internet Explorer)