PHP

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

See more ECC Examples

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.

Chilkat2 PHP

<?php

use Chilkat2\JsonObject;
use Chilkat2\PublicKey;
use Chilkat2\StringBuilder;

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

// Load a PEM file into memory.
$sbPem = new StringBuilder();
try {
    $sbPem->LoadFile('qa_data/pem/ecc_public.pem', 'utf-8');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load PEM file.\n";
    exit;
}

// Load the PEM into a public key object.
$pubKey = new PublicKey();
try {
    $pubKey->LoadFromString($sbPem->GetAsString());
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\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:

$json = new JsonObject();
$json->Load($jwk);
$json->EmitCompact = false;
echo "ECC Public Key in JWK format:\n";
echo $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:
echo $json->Emit(), "\n";

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