(PHP Extension) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux

<?php

include("chilkat.php");

$success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$rsa = new CkRsa();

// Assuming you already have a base64 modulus and exponent,
// wrap it in XML like this:
$modulus = 'qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM=';
$exponent = 'AQAB';

$xml = new CkXml();
$xml->put_Tag('RSAPublicKey');
$xml->NewChild2('Modulus',$modulus);
$xml->NewChild2('Exponent',$exponent);

$pubKey = new CkPublicKey();
$success = $pubKey->LoadFromString($xml);
if ($success == false) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

$success = $rsa->UsePublicKey($pubKey);
if ($success == false) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

$usePrivateKey = false;
$plainText = 'message in a bottle';

$rsa->put_EncodingMode('base64');
$encryptedStrBase64 = $rsa->encryptStringENC($plainText,$usePrivateKey);
print $encryptedStrBase64 . "\n";

?>