Question

I’ve followed this: https://dev.twitter.com/docs/auth/creating-signature

to the end but I can’t find how to encode a “binary string” to base64(at the end). I wanted to try online converters first but they don’t give the string the show
“tnnArxj06cWHq44gCs1OSKk/jLY=”

Tried this: http://www.motobit.com/util/base64-decoder-encoder.asp

and

http://www.hash-cracker.com/base64.php#anchor

and

http://www.opinionatedgeek.com/dotnet/tools/Base64Encode/

and none give that string.

I’m going to be using java. But I think all those java tools I search for will give the same result as the online converters. What has to be done to encode a “binary string” to base64?

Answer 1

The problem of using those online tools isn’t going to be in the base64 conversion – it’s going to be parsing the hex string into a byte array to start with. In your real code that won’t be a problem, as it’ll be the output of another stage. Just to prove that, here’s some sample Java code, using a public domain base64 encoder:

public class Test {
    public static void main(String[] args) throws Exception {
        byte[] data = { (byte) 0xB6, (byte) 0x79, (byte) 0xC0, (byte) 0xAF, 
                (byte) 0x18, (byte) 0xF4, (byte) 0xE9, (byte) 0xC5, 
                (byte) 0x87, (byte) 0xAB, (byte) 0x8E, (byte) 0x20, 
                (byte) 0x0A, (byte) 0xCD, (byte) 0x4E, (byte) 0x48, 
                (byte) 0xA9, (byte) 0x3F, (byte) 0x8C, (byte) 0xB6 };

        String text = Base64.encodeBytes(data);
        System.out.println(text);
    }
}

Output: tnnArxj06cWHq44gCs1OSKk/jLY=