Java Program 1 for Triple-DES Encryption

by J. Orlin Grabbe

In this example, we see see the following three numbers:

Java Source Code

test3des1.java

import java.io.*;
import java.security.*;
import java.math.*;
import cryptix.util.core.BI;
import cryptix.util.core.ArrayUtil;
import cryptix.util.core.Hex;
import cryptix.provider.key.*;


class test3des1 {

public static void main (String[] args) {

	try {
	FileOutputStream outFile1 = new FileOutputStream("DES-EDE3.out");
	// Note: PrintStream is deprecated, but still works fine in jdk1.1.7b
	PrintStream output1 = new PrintStream(outFile1);

	// convert a string to a 3DES key and print out the result
	RawSecretKey key2 = new RawSecretKey("DES-EDE3",Hex.fromString("3812A419C63BE771AD9F61FEFA20CE633812A419C63BE771"));
	RawKey rkey = (RawKey) key2;
	byte[] yval = rkey.getEncoded();
	BigInteger Bkey = new BigInteger(yval);
	String w = cryptix.util.core.BI.dumpString(Bkey);
	output1.println("The Encryption Key = " + w);
	
	// use the 3DES key to encrypt a string in electronic code book (ECB) mode
	Cipher des=Cipher.getInstance("DES-EDE3/ECB/NONE","Cryptix");
	des.initEncrypt(key2);	
	byte[] ciphertext = des.crypt(Hex.fromString("01010101010101010102030405060708090A0B0C0D0E0F101112131415161718"));

	// print out length and representation of ciphertext 
	output1.print("\n");
	output1.println("ciphertext.length = " + ciphertext.length);

	BigInteger Bciph = new BigInteger(ciphertext);
	w = cryptix.util.core.BI.dumpString(Bciph);
	output1.println("Ciphertext for 3DES encryption = " + w);
	
	// decrypt ciphertext 
	des.initDecrypt(key2);
	ciphertext = des.crypt(ciphertext);
	output1.print("\n");
	output1.println("plaintext.length = " + ciphertext.length);

	// print out representation of decrypted ciphertext 
	Bciph = new BigInteger(ciphertext);
	w = cryptix.util.core.BI.dumpString(Bciph);
	output1.println("Plaintext for 3DES encryption = " + w);

	output1.println(" ");
	output1.close();		

      } catch (Exception e) {
            System.err.println("Caught exception " + e.toString());
      }

	}}

Sample Program Output

DES-EDE3.out

The Encryption Key = Multi-Precision Integer 190 bits long...
      sign: Positive
 magnitude: 3812A419C63BE771 AD9F61FEFA20CE63 3812A419C63BE771 

ciphertext.length = 32
Ciphertext for 3DES encryption = Multi-Precision Integer 255 bits long...
      sign: Positive
 magnitude: 741038365B8C4BC2 01B45F3A1C9C703E 5DE9007B2288BDBD 5203FEB4F80C5BD0 

plaintext.length = 32
Plaintext for 3DES encryption = Multi-Precision Integer 249 bits long...
      sign: Positive
 magnitude: 0101010101010101 0102030405060708 090A0B0C0D0E0F10 1112131415161718 

J. Orlin Grabbe is the author of International Financial Markets, and is an internationally recognized derivatives expert who has recently branched out into cryptology, banking security, and digital cash. His home page is located at http://www.aci.net/kalliste/homepage.html. He currently resides in Costa Rica.