So I've been trying to use node with node-rsa and javascript with jsencrypt to create a website (for an assignment) where the javascript client gets the public key generated by the server (node-rsa), encrypts the message (jsencrypt) that the user has entered, sends it to the server and gets the server to decrypt it (node-rsa). The generation of the keys works, the encryption works however the decryption doesn't. When I start the node script I do the following for the encryption...

var NodeRSA = require('node-rsa');

var myDecrypter = new NodeRSA({b: 512});

When the client requests the key (I am using express) the following is ran.

app.get('/getPublicKey', function(req, res){

    var publicKeyJson = {Key: };

    console.log(myDecrypter.exportKey('public'));

    publicKeyJson.Key = myDecrypter.exportKey('public');

    res.json(JSON.stringify(publicKeyJson));

});

The client then saves that key like this...

var myEncrypter = new JSEncrypt();

var myJson  = ;

$.getJSON( getPublicKey, function( data ) {

    myJson = JSON.parse(data).Key;

        setKey();

});

function setKey() {

    myEncrypter.setPublicKey(myJson);

}

When I got to encrypt and send the message on the client I do this...

function messageEncrypt() {

    message = document.getElementById(message).value;

    var encrypted = myEncrypter.encrypt(message);

    myMessage = {username: , userId: 0.0, message: };

    myMessage.username = me.username;

    myMessage.userId = me.userId;

    myMessage.message = encrypted;

    console.log(encrypted);

    $.post(sendMessage, myMessage);

}

When the server receives a message this is what happens, this is where I get the errors.

app.post('/sendMessage', function(req, res){

    var message = req.body;

    var user = message.username;

    var id = message.userId;

    console.log(What a mess,  + user +  said  + message.message +  what on earth does that mean);

    //This line below errors

    var clearMessage = myDecrypter.decrypt(message.message, 'utf8');

    console.log(user +  said  + clearMessage);

});

The error I get is ...

Error: Error during decryption (probably incorrect key). Original error: Error: error:040A1079:rsa routines:RSA_padding_check_PKCS1_OAEP_mgf1:oaep decoding error

    at Error (native)

    at NodeRSA.module.exports.NodeRSA.$$decryptKey (/home/node_modules/node-rsa/src/NodeRSA.js:295:19)

    at NodeRSA.module.exports.NodeRSA.decrypt (/home/node_modules/node-rsa/src/NodeRSA.js:243:21)

    at /home/securechat/securechat.js:36:36

    at Layer.handle [as handle_request] (/home/node_modules/express/lib/router/layer.js:95:5)

    at next (/home/node_modules/express/lib/router/route.js:131:13)

    at Route.dispatch (/home/node_modules/express/lib/router/route.js:112:3)

    at Layer.handle [as handle_request] (/home/node_modules/express/lib/router/layer.js:95:5)

    at /home/node_modules/express/lib/router/index.js:277:22

    at Function.process_params (/home/node_modules/express/lib/router/index.js:330:12)

Here however is where it gets interesting, to get that error message above I had a private key of...

-----BEGIN RSA PRIVATE KEY-----

MIIBOgIBAAJBAIhdx31QICGN1LKRW4WngeL3RtzPh7cEHmhFJB8m4bQUSTcSi4eg

sUvMeZkWyaF9gOxtZKzk5TI6q+8hg8TY6S8CAwEAAQJASds423cVH/c4NsqhXh8e

KvYwjBFeeNIjQegIq1KctbHmKNM5MMb4jnDqdY/S5XHHS22EGvLNheLgV8tlRjwG

UQIhANpNmbl215eOsGPJ0jqz1XPMBrO35V6I3P04kvr66R1JAiEAn+oL0jtAFETR

4PRfenye5MAu9US3V5MoDN8xUoEvKrcCIQDQT2ZWNNIrHAyzXB2QyJPxqInoqp1j

5QPDWl3ewtj5iQIgY3E1nKw/stsA8LTGUvMAFBv2l4r9wDXAaBC7KSUwYY0CIAj4

0gA9etDbPm3H/XDwK4WXs9mXkKroyxewkWoOoAw/

-----END RSA PRIVATE KEY-----

and the public key sent to the client was...

-----BEGIN PUBLIC KEY-----

MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIhdx31QICGN1LKRW4WngeL3RtzPh7cE

HmhFJB8m4bQUSTcSi4egsUvMeZkWyaF9gOxtZKzk5TI6q+8hg8TY6S8CAwEAAQ==

-----END PUBLIC KEY-----

The encrypted messages (stackoverflow) was ...

XDViV0InCSnpyBxbNu5Herut0JYSsp87buvhzM4g2f9z3khIx2zA8Ou0Uq0TtmqtvBBVtZi5wZbcS6em/vB78g==

The interesting thing is that when I used the demo on jsencrypt website and enter my private key as well as the encrypted message I get the correct decrypted message.

So my question is...

What am I doing wrong with my node-rsa decryption???

If you need anymore information/code please put it in the comments below.