PHP Extension

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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<?php

include("chilkat.php");

$success = false;

//  Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
//  JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
//  Ed25519 (kty=OKP).

$privKey = new CkPrivateKey();

//  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
$jwk = '{\'kty\':\'EC\',\'crv\':\'P-256\',\'x\':\'...\',\'y\':\'...\',\'d\':\'...\'}';

$success = $privKey->LoadJwk($jwk);
if ($success == false) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

print 'Loaded a ' . $privKey->keyType() . ' private key.' . "\n";

?>