PHP, RSA, Encrypt/Decrypt

gistfile1.txt

<?php

// generate private/public key as follows:
// > openssl genrsa -out private.pem 2048
// > openssl rsa -in private.pem -outform PEM -pubout -out public.pem

$data = "String to encrypt";

$privKey = openssl_pkey_get_private('file:///path/to/private.pem');
$encryptedData = "";
openssl_private_encrypt($data, $encryptedData, $privKey);
echo 'Encrypted: ' . $encryptedData;

$pubKey = openssl_pkey_get_public('file:///path/to/public.pem');
$decryptedData = "";
openssl_public_decrypt($encryptedData, $decryptedData, $pubKey);
echo "\n---\nDecrypted: " . $decryptedData;

echo "\n[OK]\n";