Are there any examples of this?

[pogland]

I am stumped on how to use this. I really want to use ChaCha20 plus Poly1305 but it is not very popular so I couldn't find any sources on ChaCha20. This is the only source I have found. But I don't understand it very well. Could you put something like example.html in the Code area?

[calvinmetcalf]

it is designed for use with browserify, or in node.js, if you need something standalone you can use wzrd.in

[h2y]

same to me, I think the package needs a demo to encode and decode a buffer.

[h2y]

These code can't work as expected. T.T

console.log(originBuffer.toString());

cipher.setAAD(originBuffer);
let cipherRet = cipher.update(originBuffer, 'binary', 'hex');
    cipherRet += cipher.final('hex');
    
var tag = cipher.getAuthTag();
    
decipher.setAAD(originBuffer);
decipher.setAuthTag(tag);
decipher.update(cipherRet, 'hex', 'binary');
let out = decipher.final('binary');

console.log('out: ', out.toString());

[calvinmetcalf]

if you just want to know how to use buffers you can see these node references unless I'm misunderstanding

[h2y]

thanks for help, I'd like to use this module like another cipher in crypto. but the useage is not same. so i don't know how to do.

[calvinmetcalf]

the usage is identical to aes-gcm, what exactly is the issue you are having?

[calvinmetcalf]

ok I see the error in your code, binary doesn't do what you think it does and you were listening for the wrong thing a couple places.

console.log(originBuffer.toString());

cipher.setAAD(originBuffer); // you don't really have to do this, you can, but it's usualy for data you are not planing on encrypting like meta data
let cipherRet = cipher.update(originBuffer, 'this is ignored because you gave it a buffer', 'hex');
    cipherRet += cipher.final('hex'); // this is unlikely to every give you anything because of the type of cipher but it doesn't hurt to use it
    
var tag = cipher.getAuthTag();
    
decipher.setAAD(originBuffer); // see above, you don't need to do this and if you do the plain text is not what you'd want to be using as the additional authenticated data
decipher.setAuthTag(tag);
let out = decipher.update(cipherRet, 'hex'); // get it out as a buffer
decipher.final(); // this will never return anything because it's a stream cipher

[xflxy]

Thank you so much for the code.I really want to use ChaCha20, but I don't understand it very well. Could you put demo to encode and decode a message in the Code area? These code can't work! help!

var chacha20 = require('./browser');

var key = new Buffer('3zTvzr3p67VC61jmV54rIYu1545x4TlY'); var nonce = new Buffer('abcdef123456'); var nonencrypteddata = "1224345";

var cipher = chacha20.createCipher(key, nonce); var decipher = chacha20.createDecipher(key, nonce);

cipher.setAAD(nonencrypteddata); var tag = cipher.getAuthTag(); decipher.setAAD(nonencrypteddata); decipher.setAuthTag(tag);

[calvinmetcalf]

you need to finish encrypting all your data (by calling final) before you can call getAuthTag, then you need to call setAAD and setAuthTag before you add any data

[xflxy]

Thanks， The problem is solved. @calvinmetcalf

[GentritMustafa]

Hi @calvinmetcalf, can you give me an useful example with real data for encryption and decryption with ChaCha20 only, not ChaCha20 Poly1305? I think your instructions are incomplete. Thanks.

[calvinmetcalf]

@GentritMustafa there is this, do you have some questions about that?