PHP Requires Chilkat v11.0.0+

Base64url Encoding

See more Encryption Examples

Base64url encoding is identical to base64 encoding except it uses non-reserved URL characters (e.g. '–' is used instead of '+', and '_' is used instead of '/') and it omits the padding characters. Chilkat2 PHP

<?php

use Chilkat2\PrivateKey;
use Chilkat2\Rsa;

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

$pkey = new PrivateKey();
$rsa = new Rsa();
$rsa->GenKey(1024, $pkey);
$rsa->UsePrivateKey($pkey);

$strData = 'This is the string to be signed.';

// Get the signature in base64url
$rsa->EncodingMode = 'base64url';
$strSig = $rsa->SignStringENC($strData, 'sha256');

echo $strSig, "\n";