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DES Algorithm - Stream Cipher Modes and JCE SUN Implementation

Part:   1  2  3  4 

(Continued from previous part...)

JceSunDesStreamCipherTest.java - JCE DES Stream Cipher Mode Testing Program

To test out JCE DES stream cipher mode implementation, I wrote the following testing program:

/**
 * JceSunDesStreamCipherTest.java
 * Copyright (c) 2006 by Dr. Herong Yang, http://www.herongyang.com/
 */
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
class JceSunDesStreamCipherTest {
   public static void main(String[] a) {
      if (a.length<1) {
         System.out.println("Usage:");
         System.out.println(
            "java JceSunDesStreamCipherTest 1/2/3/4");
         return;
      }
      String test = a[0];
      try {
         byte[] theKey = null;
         byte[] theIVp = null;
         byte[] theMsg = null; 
         byte[] theExp = null; 
         String algorithm = null;
         if (test.equals("1")) { 
            algorithm = "DES/CFB8/NoPadding";
            theKey = hexToBytes("0123456789ABCDEF");
            theIVp = hexToBytes("1234567890ABCDEF");
            theMsg = hexToBytes("4E6F7720697320746865");
            // "Now is the"
            theExp = hexToBytes("F31FDA07011462EE187F");
         } else if (test.equals("2")) { 
            algorithm = "DES/CFB64/NoPadding";
            theKey = hexToBytes("0123456789ABCDEF");
            theIVp = hexToBytes("1234567890ABCDEF");
            theMsg = hexToBytes(
               "4E6F77206973207468652074696D6520666F7220616C6C20");
            // "Now is the time for all "
            theExp = hexToBytes(
               "F3096249C7F46E51A69E839B1A92F78403467133898EA622");
         } else if (test.equals("3")) { 
            algorithm = "DES/OFB8/NoPadding";
            theKey = hexToBytes("0123456789ABCDEF");
            theIVp = hexToBytes("1234567890ABCDEF");
            theMsg = hexToBytes("4E6F7720697320746865");
            // "Now is the"
            theExp = hexToBytes("F34A2850C9C64985D684");
         } else if (test.equals("4")) { 
            algorithm = "DES/OFB64/NoPadding";
            theKey = hexToBytes("0123456789ABCDEF");
            theIVp = hexToBytes("1234567890ABCDEF");
            theMsg = hexToBytes(
               "4E6F77206973207468652074696D6520666F7220616C6C20");
            // "Now is the time for all "
            theExp = hexToBytes(
               "F3096249C7F46E5135F24A242EEB3D3F3D6D5BE3255AF8C3");
         } else {
            System.out.println("Wrong option. For help enter:");
            System.out.println("java JceSunDesStreamCipherTest");
            return;
         }	
         KeySpec ks = new DESKeySpec(theKey);
         SecretKeyFactory kf 
            = SecretKeyFactory.getInstance("DES");
         SecretKey ky = kf.generateSecret(ks);
         Cipher cf = Cipher.getInstance(algorithm);
         if (theIVp == null) {
            cf.init(Cipher.ENCRYPT_MODE, ky);
         } else {
            AlgorithmParameterSpec aps = new IvParameterSpec(theIVp);
            cf.init(Cipher.ENCRYPT_MODE, ky, aps);
         }
         byte[] theCph = cf.doFinal(theMsg);
         System.out.println("Key     : "+bytesToHex(theKey));
         if (theIVp != null) {
            System.out.println("IV      : "+bytesToHex(theIVp));
         }
         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();
      }
   }            
}

This program provides 4 tests: CFB8, CFB64, OFB8 and OFB64 with testing plaintext messages, keys and initial vectors used in FIPS81.

(Continued on next part...)

Part:   1  2  3  4