PHP Encrypt/Decrypt using OpenSSL not working for me

Question

I'm trying to use PHP and OpenSSL to encrypt some data using a public key, and then decrypt it again.

I generated a public.key and private.key using this code:

// generate private key
$privateKey = openssl_pkey_new(array(
    'private_key_bits' => 1024,
    'private_key_type' => OPENSSL_KEYTYPE_RSA,
));
// write private key to file
openssl_pkey_export_to_file($privateKey, 'private.key');
// generate public key from private key
$publicKey = openssl_pkey_get_details($privateKey);
// write public key to file
file_put_contents('public.key', $publicKey['key']);
// clear key
openssl_free_key($privateKey);

My code to encrypt and decrypt is basically straight from the PHP documentation:

// data to encrypt
$data = "This is a long string or other bit of data that i want to encrypt";

// ==== ENCRYPT ====

// read public key
$publicKey =  file_get_contents("public.key");
$publicKey = openssl_get_publickey($publicKey);

// encrypt data using public key into $sealed
$sealed = '';
openssl_seal($data, $sealed, $ekeys, array($publicKey));
openssl_free_key($publicKey);

// ==== DECRYPT ====

// get private key to decrypt with
$privateKey = file_get_contents("private.key");
$privateKey = openssl_get_privatekey($privateKey);

// decrypt data using private key into $open
$open = '';
openssl_open($sealed, $open, $env_key, $privateKey);
openssl_free_key($privateKey);


// display decrypted data:
echo "<p>Decrypted data: ".$open;

Anyone got any clue why it is not working, or at least a way to find out what error is happening?

Answer 1

Did you forget this statement?

$env_key = $ekeys[0];

I found my answer by reading the example code for openssl_seal()