(PHP ActiveX) Get ECC Public Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

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

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

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

// Load a PEM file into memory.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbPem = new COM("Chilkat.StringBuilder");
$success = $sbPem->LoadFile('qa_data/pem/ecc_public.pem','utf-8');
if ($success != 1) {
    print 'Failed to load PEM file.' . "\n";
    exit;
}

// Load the PEM into a public key object.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.PublicKey')
$pubKey = new COM("Chilkat.PublicKey");
$success = $pubKey->LoadFromString($sbPem->getAsString());
if ($success != 1) {
    print $pubKey->LastErrorText . "\n";
    exit;
}

// Get the public key in JWK format:
$jwk = $pubKey->getJwk();

// The GetJwk method will return the JWK in the most compact JSON format possible,
// as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
// load into a Chilkat JSON object and emit non-compact:

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject')
$json = new COM("Chilkat.JsonObject");
$json->Load($jwk);
$json->EmitCompact = 0;
print 'ECC Public Key in JWK format:' . "\n";
print $json->emit() . "\n";

// Sample output:
// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
// }
// 
// Additional information can be added like this:
$json->AppendString('use','enc');
$json->AppendString('kid','123ABC');

// Now examine the JSON:
print $json->emit() . "\n";

// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
//   "use": "enc",
//   "kid": "123ABC"
// }

?>