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

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?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"
// }

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject')
$json = new COM("Chilkat.JsonObject");
$json->UpdateString('kty','EC');
$json->UpdateString('crv','P-256');
$json->UpdateString('x',$x);
$json->UpdateString('y',$y);

// Load from the JWK.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey')
$pubkey = new COM("Chilkat.PublicKey");
$success = $pubkey->LoadFromString($json->emit());
if ($success == 0) {
    print $pubkey->LastErrorText . "\n";
    exit;
}

print 'Success.' . "\n";

?>