How to convert a "binary string" to base64?

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?

Web-based tools really aren't good at binary i/o. Does it have to be web-based? — Chris Eberle
– Chris Eberle, Commented Dec 4, 2011 at 6:32
using commons.apache.org/codec/api-release/org/apache/commons/codec/… ? — user180100
– user180100, Commented Dec 4, 2011 at 6:32
It doesn't have to be web-based. I'm just trying to figure each step out and what I'd have to do. — Dave
– Dave, Commented Dec 4, 2011 at 7:08

Jon Skeet · Accepted Answer · 2011-12-04 06:30:15Z

6

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=

answered Dec 4, 2011 at 6:30

Jon Skeet

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3 Comments

Dave Over a year ago

Okay. I get it. Thanks. So here: ostermiller.org/calc/encode.html I go from "b679c0af18f4e9c587ab8e200acd4e48a93f8cb6" to decode hex. Then Encode base64 and it came out right "tnnArxj06cWHq44gCs1OSKk/jLY=". One thing I wasn't seeing was the hex thing.

Ravi Kumar Over a year ago

Are binary string and Base64 String are different or same thing? If they are different, Are binary string and byte array are same thing? I am so much confused about binary string definition.

Jon Skeet Over a year ago

@RaviKumar: You'll note I don't use the phrase "binary string" anywhere in my answer, as it's basically a nonsense. I don't know exactly what the OP meant, and they didn't provide any code...

Sorter · Accepted Answer · 2023-03-25 16:41:32Z

1

Java 8 has come up with java.util.Base64 package to help encode bytes to Base64 and vice-versa

import java.util.Base64;


byte[] bytes = string.getBytes();

// returns byte[]
Base64.getEncoder().encode(bytes);

// returns String
Base64.getEncoder().encodeToString(bytes);

edited Mar 25, 2023 at 16:41

answered Mar 25, 2023 at 11:58

Sorter

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Comments

Data Dad · Accepted Answer · 2022-01-26 13:49:06Z

0

You can use this link to convert Binary String to Base64 https://cryptii.com/pipes/binary-to-text

Here is an example of converting Binary String to Base64 String:

Here is another example of converting Normal String to Base64 String

edited Jan 26, 2022 at 13:49

answered Jan 26, 2022 at 6:31

Data Dad

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1 Comment

Yunnosch Over a year ago

I do not see how this answers the question at the top of this page, but it should. Please edit according to How to Answer or delete the answer. Otherwise it risks being flagged as "not an answer" and being deleted.

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