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?

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 — Yoni
– Yoni, Commented Mar 21, 2011 at 18:59
I don't understand. Please paste exactly what output you're getting and exactly what output you're expecting. — Wayne
– Wayne, Commented Mar 21, 2011 at 19:00
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. — Joseph Erickson
– Joseph Erickson, Commented Mar 22, 2011 at 18:46

Joseph Erickson · Accepted Answer · 2011-03-21 19:07:47Z

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.

answered Mar 21, 2011 at 19:07

Joseph Erickson

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1 Comment

Jovan Over a year ago

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

Peeter · Accepted Answer · 2011-03-21 19:10:29Z

0

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.

answered Mar 21, 2011 at 19:10

Peeter

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1 Comment

Yoni Over a year ago

@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?

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