Public/Privacy Key Encryption and Decryption example using PHP

encrypt_and_decrypt.php

<?php 

$string = "I'm using PHP to encrypt and decrypt data!";

$publicKey = file_get_contents( 'public.pub' );

openssl_public_encrypt( $string, $encrypted, $publicKey );

$encrypted = base64_encode( $encrypted );

echo '<h1>Encrypted String</h1>';
echo $encrypted;

$privKey = file_get_contents( 'private.key' );

openssl_private_decrypt( base64_decode( $encrypted ), $decrypted, $privKey );

echo '<h1>Decrypted String</h1>';
echo $decrypted;