Blowfish Encryption Using Jakarta Commons Codec 1.2

[Ashik Uzzaman]

Dear Folks,
I have prepared the following encryption/decryption methods using Jakarta commons codec 1.2. It works fine. But the problem is I was trying to insert a key of mine to that you'll find in comment#2.

* 2. We 'should' supply a string as a key for encryption/decryption - this is our "this.strKey". I didn't find any place to use it yet.

Please help me directing how and where I can pass a string key to generate the key for codec or whether its not possible at all.

/**
 * @(#) TestBlowFish.java
 * @author Ashik
 * @history
 *          created  : Ashik : Date : December 16, 2003, 1:00 PM
 * @version 1.0
 */
package com.javaranch.otherjavaapis.test;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.codec.binary.Base64;
public class TestBlowFish {
private static SecretKey skey = null;
private static SecretKeySpec skeySpec = null; 
private static Cipher cipher = null;
/** for base64 encodig/decoding */
private static final Base64 base64 = new Base64();

public static void main(String[] args) throws Exception {
TestBlowFish t = new TestBlowFish();
t.prepareEncDec();
String sEncData = t.encryptWithBlowfishKey("Hello World");
System.out.println("\nHello World is encrypted using blowgish as: " + sEncData);
String sDecData = t.decryptWithBlowfishKey(sEncData);
System.out.println("\n" + sEncData + " or encrypted version of Hello World is decrypted as: " + sDecData);
}
//==================Encryption/Decryption related utility methods===============================
/**
 * Prepare encryption/decryption
 * 1. We are using Jakarta Commons Codec 1.2 for base 64 or any other encryption mechanism.
 * 2. We 'should' need a string as a key for encryption - this is our "this.strKey". I didn't find any place to use it yet.
 * 3. Build a SecretKey using "Blowfish" algorithm - this is our "skey".
 * 4. It builds a SecretKeySpec using "Blowfish" algorithm - this is our "skeySpec".
 * 5. It now builds a cipher class object using "Blowfish" algorithm - this is our "cipher".
 */
public static void prepareEncDec() {
try {
skey = KeyGenerator.getInstance("Blowfish").generateKey();
}
catch(NoSuchAlgorithmException nsae) {
System.err.println("KeyGenerator(Blowfish) algorithm not found");
return;
}
byte[] raw = skey.getEncoded();
skeySpec = new SecretKeySpec(raw, "Blowfish");
try {
cipher = Cipher.getInstance("Blowfish");
}
catch(NoSuchAlgorithmException nsae) {
System.err.println("Cipher(Blowfish) algorithm not found");
}
catch(NoSuchPaddingException nspe) {
System.err.println("Cipher(Blowfish) padding not found");
}
}
/** 
 *  @param sDataToEncrypt - String that needs to be encrypted.
 *  @return String - encrypted string
 */
public static String encryptWithBlowfishKey(String sDataToEncrypt) throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(sDataToEncrypt.getBytes());
for (int i=0; i<encrypted.length; ++i) {
System.out.print(encrypted[i]);
}
return new String(encrypted);
}
/** 
 *  @param sDataToDecrypt - String that needs to be decrypted.
 *  @return String - decrypted string
 */
public static String decryptWithBlowfishKey(String sDataToDecrypt) throws Exception {
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] encrypted = sDataToDecrypt.getBytes();
byte[] decrypted = cipher.doFinal(encrypted);
for (int i=0; i<decrypted.length; ++i) {
System.out.print(decrypted[i]);
}
String decryptedString = new String(decrypted);
return new String(decryptedString);
}
}

Waiting for your response. :roll: