java concatenate two strings error

Question

I have one function that returns me String :

public String getString(String password){
 ......
 try {
 .......
 encodedPassword = Base64.encodeToString(msgDigest,1 );
 } catch (UnsupportedEncodingException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 } catch (NoSuchAlgorithmException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 return encodedPassword;
 }

I want to add (concatenate) "=" String to returning string from function

I try using this:

encrptdPassword = getString("1234");
encrptdPassword = encrptdPassword+"=";

Or:

encrptdPassword = encrptdPassword .concat("=");

but I get result like two different objects (space or brake between)

I think problem is in Base64.encodeToString , but I must use 64 based string

---

Function getString returns me:

A6xnQhbz4Vx2HuGl4lXwZ5U2I8iziLRFnhP5eNfIRvQ

I want to add = to the returning string as:

A6xnQhbz4Vx2HuGl4lXwZ5U2I8iziLRFnhP5eNfIRvQ=

but I receive this on output

A6xnQhbz4Vx2HuGl4lXwZ5U2I8iziLRFnhP5eNfIRvQ = 

Or:

A6xnQhbz4Vx2HuGl4lXwZ5U2I8iziLRFnhP5eNfIRvQ
=

...like 2 different strings.

Where I'm wrong?

• Yoni: Please post an example of your input and of the wrong result that you are getting. Otherwise it is not clear what is the problem
• Wayne: I don't understand. Please paste exactly what output you're getting and exactly what output you're expecting.
• Joseph Erickson: Is this Android? You'd get a lot better answers if you pointed that out or what library you're using for the Base64 class.

Answer 1

I assume you're using Base64 from Apache Commons Codec.

The default constructor for this class uses "\r\n" as a line separator, which it adds to the end of every encoded line. If you don't want this, construct the object as:

new Base64(76, '');

If this isn't the class you're calling (it looks like from your code sample you're calling a static method), check the API and see if you can set a line separator for the conversion.

• Jovan: can you please post me code ? msgDigest is byte array (byte[])

Answer 2

Isn't the 1 in Base64.encodeToString(msgDigest,1 ) padding?

If it's not, then you could just trim() the string to remove the whitespace.

• Yoni: @Jovan, maybe trim worked, but I wouldn't rely on it. If the space or carriage return were there before the concatenation, I'd want to understand why. What implementation of base64 are you using?