PHP

Export a Public Key as XML

Demonstrates the Chilkat PublicKey.GetXml method, which returns the public key in Chilkat XML format. It takes no arguments; the exact representation (for example an RSAPublicKey element) depends on the key type.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The XML key format comes from the .NET/XML-DSIG world; exporting to it lets you hand a public key to .NET code or a system built around XML signatures. It is the inverse of LoadXml-style loading. Because a public key is not secret, this XML can be shared freely.

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<?php

use Chilkat2\PublicKey;

// Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
// JWK, and other supported representations.
$pubKey = new PublicKey();
try {
    $pubKey->LoadFromFile('qa_data/public.pem');

    // Export the public key in Chilkat XML format.  The representation depends on the key type (for
    // example an RSAPublicKey element for RSA).
    $xml = $pubKey->GetXml();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $xml, "\n";