Encrypt string in JavaScript and decrypt in PHP with RSA technique [duplicate]

Question

I am trying to encrypt some text in JavaScript and then send it to PHP (etc: with Ajax) to decrypt it there and save it (etc: In MySQL).

Here is my code so far:

In JavaScript:

I am using this library for the encryption: http://travistidwell.com/blog/2013/02/15/a-better-library-for-javascript-asymmetrical-rsa-encryption/

function ConvertToURL(data) {
    // Converts data to URL friendly form
    // etc: Replaces '+', '/', '=' with 'plus', 'slash', 'equal'
};
function AjaxOrder(data) {
    // Sends data in PHP with Ajax
};

var publicKey = '-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlOJu6TyygqxfWT7eLtGDwajtN
FOb9I5XRb6khyfD1Yt3YiCgQWMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76
xFxdU6jE0NQ+Z+zEdhUTooNRaY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4
gwQco1KRMDSmXSMkDwIDAQAB
-----END PUBLIC KEY-----';

var encrypt = new JSEncrypt();
encrypt.setPublicKey(publicKey);
var encrypted = encrypt.encrypt('Text to send.');

AjaxOrder(ConvertToURL(encrypted));

In PHP:

$dataPost = $_POST('dt');

function ConvertFromURL($data) {
    // Converts $data to original form
    // etc: Replaces 'plus', 'slash', 'equal' with '+', '/', '='
}
function ReturnData($data) {
    // Sends $data back in JavaScript as an answer to Ajax
}

$privateKey = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';

openssl_private_decrypt(ConvertFromURL($dataPost), $decryptedWord, $privateKey);

ReturnData(base64_encode($decryptedWord));

Now the answer from PHP is empty every time. Any ideas to make this work?

Thank you for your time!

Please see this article: matasano.com/articles/javascript-cryptography — ntoskrnl
– ntoskrnl, Commented Dec 13, 2013 at 13:22

Janmar · Accepted Answer · 2013-12-13 11:01:40Z

0

Yes,

It adds some "random" padding tot the message before it does the magic.

answered Dec 13, 2013 at 11:01

Janmar

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3 Comments

Kostas Over a year ago

Yes just I thought so. The question though is how can achieve the encrypted transfer between the two languages. Is there any better way than RSA? Or at least can I stop the random process to make the two languages communicate?

Janmar Over a year ago

You dont want to stop the randomnes because that's part of the encryption. if you decrypt the message with your private key it will return the originial message if you did it correctly.

Kostas Over a year ago

Ok so this is not a problem.. But it still doesn't work.

neubert · Accepted Answer · 2013-12-13 15:15:26Z

0

Maybe try doing base64_decode in the ConvertFromURL($data) function?

answered Dec 13, 2013 at 15:15

neubert

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