(PHP Extension) Verify a CAdES-BES Signature and Examine Signature Contents

Demonstrates how to validate a .p7m (.p7s) signature and examine the contents of the signature.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

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

$crypt = new CkCrypt2();

$outputFile = 'qa_output/original.xml';
$inFile = 'qa_data/p7m/fattura_signature.xml.p7m';

// Verify the signature and extract the contained file, which in this case is XML.
$success = $crypt->VerifyP7M($inFile,$outputFile);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Signature validated.' . "\n";

// Now let's examine the information about the signature.
// json is a CkJsonObject
$json = $crypt->LastJsonData();
if ($crypt->get_LastMethodSuccess() == false) {
    // This should never be the case...
    print 'No information available.' . "\n";
    exit;
}

$json->put_EmitCompact(false);
print $json->emit() . "\n";

// Here's an example of the information about the signature:
// {
//   "pkcs7": {
//     "verify": {
//       "certs": [
//         {
//           "issuerCN": "Xyz EU Qualified Certificates CA G1",
//           "serial": "99A28A51AC389999"
//         }
//       ],
//       "useConstructedOctets": true,
//       "digestAlgorithms": [
//         "sha256"
//       ],
//       "signerInfo": [
//         {
//           "cert": {
//             "subjectKeyIdentifier": "5VM4x8AWnXf07yzbXuLtbb0U3yY=",
//             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//             "digestAlgName": "SHA256"
//           },
//           "signingAlgOid": "1.2.840.113549.1.1.11",
//           "signingAlgName": "RSA-SHA256-PKCSV-1_5",
//           "authAttr": {
//             "1.2.840.113549.1.9.3": {
//               "name": "contentType",
//               "oid": "1.2.840.113549.1.7.1"
//             },
//             "1.2.840.113549.1.9.5": {
//               "name": "signingTime",
//               "utctime": "190901152340Z"
//             },
//             "1.2.840.113549.1.9.4": {
//               "name": "messageDigest",
//               "digest": "y+gd/zAQK33A//HInhaZba7w1fUJleV9AHbP1Ntx6U0="
//             },
//             "1.2.840.113549.1.9.16.2.47": {
//               "name": "signingCertificateV2",
//               "der": "MIH4MI..w4vv0="
//             }
//           }
//         }
//       ]
//     }
//   }
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

$authAttrSigningTimeUtctime = new CkDtObj();

$i = 0;
$count_i = $json->SizeOfArray('pkcs7.verify.certs');
while ($i < $count_i) {
    $json->put_I($i);
    $issuerCN = $json->stringOf('pkcs7.verify.certs[i].issuerCN');
    $serial = $json->stringOf('pkcs7.verify.certs[i].serial');
    $i = $i + 1;
}

$i = 0;
$count_i = $json->SizeOfArray('pkcs7.verify.digestAlgorithms');
while ($i < $count_i) {
    $json->put_I($i);
    $strVal = $json->stringOf('pkcs7.verify.digestAlgorithms[i]');
    $i = $i + 1;
}

$i = 0;
$count_i = $json->SizeOfArray('pkcs7.verify.signerInfo');
while ($i < $count_i) {
    $json->put_I($i);
    $certSubjectKeyIdentifier = $json->stringOf('pkcs7.verify.signerInfo[i].cert.subjectKeyIdentifier');
    $certDigestAlgOid = $json->stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgOid');
    $certDigestAlgName = $json->stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgName');
    $signingAlgOid = $json->stringOf('pkcs7.verify.signerInfo[i].signingAlgOid');
    $signingAlgName = $json->stringOf('pkcs7.verify.signerInfo[i].signingAlgName');
    $authAttrContentTypeName = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.3\'.name');
    $authAttrContentTypeOid = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.3\'.oid');
    $authAttrSigningTimeName = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.5\'.name');
    $json->DtOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.5\'.utctime',false,$authAttrSigningTimeUtctime);
    $authAttrMessageDigestName = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.4\'.name');
    $authAttrMessageDigestDigest = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.4\'.digest');
    $authAttrSigningCertificateV2Name = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.16.2.47\'.name');
    $authAttrSigningCertificateV2Der = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr.\'1.2.840.113549.1.9.16.2.47\'.der');
    $i = $i + 1;
}


?>