PHP ActiveX

Validate JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) using HMAC SHA-256. PHP ActiveX

<?php

$success = 0;

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

// This example takes a JSON signature in compact serialization format,
// and uses a MAC key to validate and recover the protected header and payload.

$jws = new COM("Chilkat.Jws");

// Set the HMAC key:
$hmacKey = 'AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow';
$signatureIndex = 0;
$jws->SetMacKey($signatureIndex,$hmacKey,'base64url');

// Load the JWS.
$jwsCompact = 'eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk';
$success = $jws->LoadJws($jwsCompact);

// Validate the 1st (and only) signature at index 0..
$v = $jws->Validate($signatureIndex);
if ($v < 0) {
    // Perhaps Chilkat was not unlocked or the trial expired..
    print 'Method call failed for some other reason.' . "\n";
    print $jws->LastErrorText . "\n";
    exit;
}

if ($v == 0) {
    print 'Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both.' . "\n";
    exit;
}

// If we get here, the signature was validated..
print 'Signature validated.' . "\n";

// Recover the original content:
print 'Recovered content:' . "\n";
print $jws->getPayload('utf-8') . "\n";

// Examine the protected header:

$joseHeader = new COM("Chilkat.JsonObject");
$success = $jws->GetProtectedH($signatureIndex,$joseHeader);
if ($success == 0) {
    print $jws->LastErrorText . "\n";
    exit;
}

$joseHeader->EmitCompact = 0;

print 'Protected (JOSE) header:' . "\n";
print $joseHeader->emit() . "\n";

// Output:

// 	Signature validated.
// 	Recovered content:
// 	{"iss":"joe",
// 	 "exp":1300819380,
// 	 "http://example.com/is_root":true}
// 	Protected (JOSE) header:
// 	{ 
// 	  "typ": "JWT",
// 	  "alg": "HS256"
// 	}

?>