PHP Requires Chilkat v11.0.0+

Validate Certificate using OCSP Protocol

See more Certificates Examples

Demonstrates how to validate a certificate (check the revoked status) using the OCSP protocol. Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\Cert;
use Chilkat2\Http;
use Chilkat2\HttpResponse;
use Chilkat2\JsonObject;
use Chilkat2\Prng;

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

// This example will check the revoked status of a certificate loaded from a file.
$cert = new Cert();
try {
    $cert->LoadFromFile('qa_data/certs/google.crt');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the cert's OCSP URL.
$ocspUrl = $cert->OcspUrl;

// Build the JSON that will be the OCSP request.

// Possible hash algorithms are sha1, sha256, sha384, sha512.
$hashAlg = 'sha256';
$prng = new Prng();
$json = new JsonObject();
$json->EmitCompact = false;
// Read more about OCSP nonce lengths
$json->UpdateString('extensions.ocspNonce', $prng->GenRandom(16, 'base64'));
$json->I = 0;
$json->UpdateString('request[i].cert.hashAlg', $hashAlg);
$json->UpdateString('request[i].cert.issuerNameHash', $cert->HashOf('IssuerDN', $hashAlg, 'base64'));
$json->UpdateString('request[i].cert.issuerKeyHash', $cert->HashOf('IssuerPublicKey', $hashAlg, 'base64'));
$json->UpdateString('request[i].cert.serialNumber', $cert->SerialNumber);

echo $json->Emit(), "\n";

// Our OCSP request looks something like this:
// {
//   "extensions": {
//     "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO"
//   },
//   "request": [
//     {
//       "cert": {
//         "hashAlg": "sha1",
//         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
//         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//         "serialNumber": "6175535D87BF94B6"
//       }
//     }
//   ]
// }

$ocspRequest = new BinData();
$http = new Http();

// Convert our JSON to a binary (ASN.1) OCSP request
try {
    $http->CreateOcspRequest($json, $ocspRequest);

    // Send the OCSP request to the OCSP server
    $resp = new HttpResponse();
    $http->HttpBd('POST', $ocspUrl, $ocspRequest, 'application/ocsp-request', $resp);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the binary (ASN.1) OCSP reply
$ocspReply = new BinData();
$resp->GetBodyBd($ocspReply);

// Convert the binary reply to JSON.
// Also returns the overall OCSP response status.
$jsonReply = new JsonObject();
$ocspStatus = $http->ParseOcspReply($ocspReply, $jsonReply);

// The ocspStatus can have one of these values:
// -1:  The ARG1 does not contain a valid OCSP reply.
// 0:  Successful - Response has valid confirmations..
// 1: Malformed request - Illegal confirmation request.
// 2: Internal error - Internal error in issuer.
// 3: Try later -  Try again later.
// 4: Not used - This value is never returned.
// 5: Sig required - Must sign the request.
// 6: Unauthorized - Request unauthorized.

if ($ocspStatus < 0) {
    echo "Invalid OCSP reply.\n";
    exit;
}

echo 'Overall OCSP Response Status: ', $ocspStatus, "\n";

// Let's examine the OCSP response (in JSON).
$jsonReply->EmitCompact = false;
echo $jsonReply->Emit(), "\n";

// The JSON reply looks like this:
// (Use the online tool at https://tools.chilkat.io/jsonParse.cshtml
// to generate JSON parsing code.)

// {
//   "responseStatus": 0,
//   "responseTypeOid": "1.3.6.1.5.5.7.48.1.1",
//   "responseTypeName": "ocspBasic",
//   "response": {
//     "responderIdChoice": "KeyHash",
//     "responderKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//     "dateTime": "20180803193937Z",
//     "cert": [
//       {
//         "hashOid": "1.3.14.3.2.26",
//         "hashAlg": "SHA-1",
//         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
//         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//         "serialNumber": "6175535D87BF94B6",
//         "status": 0,
//         "thisUpdate": "20180803193937Z",
//         "nextUpdate": "20180810193937Z"
//       }
//     ]
//   }
// }
//

// The certificate status:
$certStatus = -1;
if ($jsonReply->HasMember('response.cert[0].status')) {
    $certStatus = $jsonReply->IntOf('response.cert[0].status');
}

// Possible certStatus values are:
// -1: No status returned.
// 0: Good
// 1: Revoked
// 2: Unknown.
echo 'Certificate Status: ', $certStatus, "\n";