CODEWITHSUNDEEP
javaphpencryptionrsapublic-key-encryption
Uranium Developers
Uranium Developers

Reputation: 132

Java send PublicKey to PHP and encrypt data

So I have a PublicKey in Java, and I need to send a post request to the server with the key in it, then read the key server side, and send some data encrypted with it!

I succeeded at:

String phpPublic = ("-----BEGIN PUBLIC KEY-----"+Base64.encodeToString(MainActivity.instance.rsa.readPublicKeyFromFile(MainActivity.instance.rsa.PUBLIC_CLIENT_KEY_FILE).getEncoded(),Base64.DEFAULT)+"-----END PUBLIC KEY-----");

I think this does it, but I'm not sure! And would it be the same process to convert private keys to pem, just to make PUBLIC -> PRIVATE in the header and footer.

I don't know if converting to pem is really necessary, if it's not, please suggest a better way to do it.

This is how I do it in PHP, but I'm 99% sure it is wrong

$PubKey = openssl_pkey_get_public($publicPem);
$encrypted;
openssl_public_encrypt($toEncode, $encrypted, $PubKey);
echo $encrypted;

Upvotes: 2

Views: 493

Answers (1)

keercllub
keercllub

Reputation: 11

can you post a sample key?

in lieu of that i do think you'd have better success with phpseclib a pure php rsa implementation. it supports a lot more key formats than openssl does and it'll auto detect the type too.

example:

<?php
include('Crypt/RSA.php');

$rsa = new Crypt_RSA();
$rsa->loadKey('...');

$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
echo $rsa->encrypt('whatever');

Upvotes: 1

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