Java send PublicKey to PHP and encrypt data

Question

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:

Generating the keypair (duh)
Encrypting and decrypting data with it in the Java program
Maybe: making a pem formatted key from it, I'm not sure

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;

What is the problem? Have you tried running that code? Did you get wrong result or an error? — Oleg Estekhin
– Oleg Estekhin, Commented Jul 18, 2014 at 4:22

keercllub · Accepted Answer · 2014-07-18 19:24:06Z

1

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');

answered Jul 18, 2014 at 19:24

keercllub

111 bronze badge

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Java send PublicKey to PHP and encrypt data

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related