How is base64 encoding and bas64 decoding done with crypto++?

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How is base64 Encoding and Bas64 decoding done with crypto++?

What I have tried:

I did a google search which gave an example for base64Encoding but gave none for decoding?

Posted 26-Jul-24 18:42pm

Gbenbam

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OriginalGriff · Answer 1 · 2024-07-26T19:11:00

You actually used Google! Well done!

Pity you didn't actually look at any of the results ... Base64 - Wikipedia[^] covers both encoding and decoding - but you should realize that Base64 isn't a form of encryption, it's a translation which allows binary data to be transferred via a test-only medium and is "crackable" by four year olds given a big enough crayon ...

Pete O'Hanlon · Answer 2 · 2024-07-26T22:34:00

Solution 2

If you're looking to decode base64, something like this will do it.

std::string decodeBase64EncodedString(std::string encoded) {
    std::string decoded;

    
    CryptoPP::Base64Decoder decoder;
      
 
    decoder.Put(
     (CryptoPP::byte*)encoded.data(), encoded.size());
    decoder.MessageEnd();

    CryptoPP::word64 size = decoder.MaxRetrievable();
    if(size && size <= SIZE_MAX) {
       decoded.resize(size);
            decoder.Get((CryptoPP::byte*)&decoded[0], decoded.size());
    }
    return decoded;
}

Posted 26-Jul-24 22:34pm

Pete O'Hanlon

Comments

OriginalGriff 27-Jul-24 8:47am

This is a serious Help Vampire - check his history ... :sigh:

Pete O'Hanlon 27-Jul-24 11:12am

Oh crap. I hadn't realised that. Thanks for the heads up.

Gbenbam 27-Jul-24 15:43pm

You should realise that @OriginalGriff has an axe to grind with me. He has been trying hard to get at me, but I have simply ignored him. His latest antic is turning people against me. Don't be fooled. I ask questions and give answers.How does that make me a kmowledge vampire. Here are same codes I got from the net but my compiler did not recognise the base64Encoder and base64Decoder words , I am guessing that it is because of of header file unprovided. I am still trying to figure out the header file.

bool Base64Encode(std::string ciphertext, std::string &encoded)
{
CryptoPP::StringSource(ciphertext, true,
new CryptoPP::Base64Encoder(new CryptoPP::StringSink(encoded)));
}

bool Base64Decode(std::string encoded, std::string& ciphertext)
{
CryptoPP::StringSource(encoded, true,
new CryptoPP::Base64Decoder(new CryptoPP::StringSink(ciphertext)));
}

As for @OriginalGriff,this where he started having issues with me.
https://www.codeproject.com/Questions/5383852/What-will-happen-if-a-user-attempt-to-use-an-accel

He broke the following codeproject rule,rather than feeling any remorse,he is busy planning revenge:

"Let's work to help developers, not make them feel stupid."

He promised in a now deleted post, that I will soon not have an account. Well, he failed because I simply ignored him. Well, my suggestion to you is that you should feel free to ignore any of my questions, but don't do it because you were fooled into doing so. Its unfortunate that his unsavoury comments have been deleted.I would have shown them to you.

See him at work here.
https://www.codeproject.com/Questions/5384537/How-to-programatically-get-the-number-of-menus-in

Like I said,feel free to ignore my questions,but do so for the right reasons.

Dave Kreskowiak 29-Jul-24 17:34pm

No, he's not grinding an axe with you. You are literally using us to do your research work for you and try to explain whatever the answers are in the simplest terms possible. After 360 questions, you'd think you would have gotten the hang of doing research by now.

Gbenbam 3-Aug-24 17:59pm

O.K. You should be able to prove this allegation with recent questions. Give me proof. Perhaps, more importantly,tell me how exactly you believe that codeproject should be used.

Gbenbam 3-Aug-24 18:06pm

Update:

Feel free to report or ignore my questions completely and encourage everyone to do so. Surely, If everyone does that, I will have no other choice than to move to another forum.

Dave Kreskowiak 3-Aug-24 21:08pm

You want proof? Here you go: Member questions & answers[^]

Gbenbam 4-Aug-24 6:11am

Do you mind explaining your proof? I did not quite understand it.

Dave Kreskowiak 4-Aug-24 12:24pm

And therein lies your entire problem.

Gbenbam 3-Aug-24 18:15pm

Update2:

Why is www.stackoverflow.com the core of programming AI? Its because people asked questions whose answers were given in the simplest possible way with relevant codes. Copilot's primary reference is www.stackoverflow.com. You will definitely fall in love with the simplicity of many amswers on stackoverflow with relevant codes. If your accusations are indeed true, which I believe are not, I am actually setting up codeproject to be a major reference of copilot and other programming AI.

Dave Kreskowiak 3-Aug-24 21:06pm

Well, if SO is the "primary source" for CoPilot, that explains all the mistakes it makes.

Gbenbam 4-Aug-24 6:09am

The point is,even if I am guilty of your accusation, which I am not, the population of programmers,world wide, who are guilty of the same accusation; is certainly astronomically large. StackOverflow, cplusplus forum and many many other similar forum where there is question and answer facility are testament to that fact. By the way, no AI is perfect. All of them state categorically that you should not expect perfection from them. And please, in my own opinion, stackoverflow is the best question and answer website on the web as at today. Programming AI use it as primary base for good reasons.

Dave Kreskowiak 4-Aug-24 12:24pm

Oh, you are very much guilty of not teaching yourself how to, well, teach yourself. That's what that list means. You have no idea how to research problems and you're entirely dependent on other people to do the hard work of research for you.

merano99 · Answer 3 · 2024-07-29T11:12:00

You can use the methods in this way without using a try-catch block:

C++

#include "../cryptopp/base64.h"

// text to be encoded
std::string encodetxt, decodetxt, uncodedtxt("This is a sample text for base64 coding!");

// Base64 encoding (Base64Encoder)
CryptoPP::StringSource ss1(uncodedtxt, true,
         new CryptoPP::Base64Encoder(  new CryptoPP::StringSink(encodetxt) )); 

// Base64 decoding (Base64Decoder)
CryptoPP::StringSource ss2(encodetxt, true,
          new CryptoPP::Base64Decoder( new CryptoPP::StringSink(decodetxt) ));

The coding is based on RFC4648, additional code is required for a web safe alphabet according to the documentation.

steveb · Answer 4 · 2024-07-29T06:02:00

Solution 3

Encrypt with CrtptoPP -> Encode to Base 64 -> Decode from Base 64 -> Decrypt with CryptoPP

Posted 29-Jul-24 6:02am

steveb

Updated 29-Jul-24 6:07am

v2