Java Triple DES encryption with 2 different keys

I'm trying to encrypt data using triple DES with two different keys, so given the two keys k1 and k2 the cryptotext would be Ek1(Dk2(Ek1(plaintext))) where E is Encryption and D Decryption. I'm trying to simulate this using DES algorithm from java. Here is the code:

public static void main(String[] args) {

    SecretKey k1 = generateDESkey();
    SecretKey k2 = generateDESkey();

    String firstEncryption = desEncryption("plaintext", k1);
    String decryption = desDecryption(firstEncryption, k2);
    String secondEncryption = desEncryption(decryption, k1);

}

public static SecretKey generateDESkey() {
    KeyGenerator keyGen = null;
    try {
        keyGen = KeyGenerator.getInstance("DES");
    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    }
    keyGen.init(56); // key length 56
    SecretKey secretKey = keyGen.generateKey();
    return secretKey;
}

public static String desEncryption(String strToEncrypt, SecretKey desKey) {
    try {
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, desKey);
        String encryptedString = Base64.encode(cipher.doFinal(strToEncrypt.getBytes()));
        return encryptedString;


    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (NoSuchPaddingException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalBlockSizeException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (BadPaddingException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (InvalidKeyException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    }
    return null;
}

public static String desDecryption(String strToDecrypt, SecretKey desKey) {
    try {
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, desKey);
        String decryptedString = new String(cipher.doFinal(Base64.decode(strToDecrypt)));
        return decryptedString;


    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (NoSuchPaddingException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (InvalidKeyException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalBlockSizeException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (BadPaddingException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    } catch (Base64DecodingException ex) {
        Logger.getLogger(Test.class
                .getName()).log(Level.SEVERE, null, ex);
    }
    return null;
}

I have this error: javax.crypto.BadPaddingException: Given final block not properly padded when trying to decrypt at this line of code:

String decryptedString = new String(cipher.doFinal(Base64.decode(strToDecrypt)));

Can you help me to resolve this problem or do you know a direct method to encrypt data using triple DES with two different keys with total key length of 128 bits? I didn't find any algorithm so I tried to simulate it using simple DES.

Why not just use the included DESede algorithm?

Change all your DES code instances to DESede and change your Key Generation method to as such:

public static SecretKey generateDESkey() {
    KeyGenerator keyGen = null;
    try {
        keyGen = KeyGenerator.getInstance("DESede");
    } catch (NoSuchAlgorithmException ex) {
        Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
    }
    keyGen.init(112); // key length 112 for two keys, 168 for three keys
    SecretKey secretKey = keyGen.generateKey();
    return secretKey;
}

Note how the getInstance() method is now supplied with DESede and the key size has been increased to 112 (168 for three keys).

Change your Cipher instances from:

Cipher.getInstance("DES/ECB/PKCS5Padding");

to

Cipher.getInstance("DESede/ECB/PKCS5Padding");

And you are set.