(PHP Extension) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

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

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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");

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

// The JWS to be created will contain one signature using an ECDSA key.

$sbEccJwk = new CkStringBuilder();
$sbEccJwk->Append('{\'kty\':\'EC\',');
$sbEccJwk->Append('\'crv\':\'P-256\',');
$sbEccJwk->Append('\'x\':\'f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\',');
$sbEccJwk->Append('\'y\':\'x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\',');
$sbEccJwk->Append('\'d\':\'jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\'');
$sbEccJwk->Append('}');

$eccKey = new CkPrivateKey();
// Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
// into the private key object. (See the online reference documentation..)
$success = $eccKey->LoadJwk($sbEccJwk->getAsString());
if ($success != true) {
    print $eccKey->lastErrorText() . "\n";
    exit;
}

// ---------------------------------------------------
// Prepare both a protected and unprotected header.

$jwsProtHdr = new CkJsonObject();
$jwsProtHdr->AppendString('alg','ES256');

$jwsUnprotHdr = new CkJsonObject();
$jwsUnprotHdr->AppendString('kid','myEcKey');

// ---------------------------------------------------
$jws = new CkJws();

$jws->SetProtectedHeader(0,$jwsProtHdr);
$jws->SetUnprotectedHeader(0,$jwsUnprotHdr);

$jws->SetPrivateKey(0,$eccKey);

$bIncludeBom = false;
$payloadStr = 'In our village, folks say God crumbles up the old moon into stars.';
$jws->SetPayload($payloadStr,'utf-8',$bIncludeBom);

// ---------------------------------------------------
// Create the JWS.
// Indicate we prefer the non-compact, flattened serialization.
$jws->put_PreferCompact(false);
$jws->put_PreferFlattened(true);

$jwsStr = $jws->createJws();
if ($jws->get_LastMethodSuccess() != true) {
    print $jws->lastErrorText() . "\n";
    exit;
}

// The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
// To get in human-readable format, load into a Chilkat JSON object and emit..
$json = new CkJsonObject();
$json->Load($jwsStr);
$json->put_EmitCompact(false);
print $json->emit() . "\n";

// Sample output:

// { 
//   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
//   "protected": "eyJhbGciOiJFUzI1NiJ9",
//   "header": { 
//     "kid": "myEcKey"
//   },
//   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
// }

?>