(PHP Extension) Load ECC Private Key from JWK Format (JSON Web Key)

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

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<?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");

// Note: This example requires Chilkat v9.5.0.66 or later.

// First build a JWK sample to load..
$json = new CkJsonObject();
$json->UpdateString('kty','EC');
$json->UpdateString('crv','P-256');
$json->UpdateString('x','oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE');
$json->UpdateString('y','vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU');
$json->UpdateString('d','EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM');

// The JSON contains the following:
// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
//   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
// }

// Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
$json->put_EmitCompact(false);

// Show the JWK string to be loaded:
$jwkStr = $json->emit();

$privKey = new CkPrivateKey();
$success = $privKey->LoadJwk($jwkStr);
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// OK.. the JWK is loaded.  It can be used in whatever way desired...

// The key can be retrieved in any other format, such as XML or PEM..
print $privKey->getXml() . "\n";

// XML output:
// <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

print $privKey->getPkcs8EncryptedPem('secret') . "\n";

// PEM output
// 
// -----BEGIN ENCRYPTED PRIVATE KEY-----
// MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
// FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
// Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
// QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
// KUL8KXT4Pq8=
// -----END ENCRYPTED PRIVATE KEY-----

?>