Java Program 1 for Triple-DES Encryption

This program, test3des1.java is only a minor variation on the testDES.java program. The test3des1.java program:

takes the 3DES key input and a text string (to be encrypted) from the program itself (not from a file),

encrypts the string in electronic code book (ECB) mode (to produce the ciphertext),

writes the key and the ciphertext to a file DES-EDE3.out,

decrypts the ciphertext (still in computer memory), and writes the resulting plaintext string to the file.

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

3DES key: 3812A419C63BE771 AD9F61FEFA20CE63 3812A419C63BE771

Plaintext: 0101010101010101 0102030405060708 090A0B0C0D0E0F10 1112131415161718

Ciphertext: 741038365B8C4BC2 01B45F3A1C9C703E 5DE9007B2288BDBD 5203FEB4F80C5BD0

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

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