(PHP Extension) Load EC Public Key from X,Y Values

Demonstrates how to load an EC public key from X and Y values.

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

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");



// We have the following x and y values in base64 (for an EC point on the P-256 curve).
$x = 'Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw';
$y = 'iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU';

// Build a JWK that looks like this:

// {
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw",
//   "y": "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"
// }

$json = new CkJsonObject();
$json->UpdateString('kty','EC');
$json->UpdateString('crv','P-256');
$json->UpdateString('x',$x);
$json->UpdateString('y',$y);

// Load from the JWK.
$pubkey = new CkPublicKey();
$success = $pubkey->LoadFromString($json->emit());
if ($success == false) {
    print $pubkey->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>