PHP Extension

P7S - Access Signature Information (date/time, certificate used, etc.)

See more Digital Signatures Examples

Examine a PKCS7 signature (.p7s) and get information about it. PHP Extension

<?php

include("chilkat.php");

$success = false;

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

// First load the .p7s file into a BinData object..
$bd = new CkBinData();
$success = $bd->LoadFile('qa_data/p7s/sample.p7s');
if ($success != true) {
    print 'Failed to load .p7s file.' . "\n";
    exit;
}

$crypt = new CkCrypt2();

// Assuming this is a signature that contains the original data that was signed..
$success = $crypt->OpaqueVerifyBd($bd);
if ($success == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// Examine the last JSON data after signature verification..
$json = new CkJsonObject();
$crypt->GetLastJsonData($json);

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

// Sample output...
// Go to http://tools.chilkat.io/jsonParse.cshtml
// and paste the JSON into the online form to generate JSON parsing code.

// {
//   "pkcs7": {
//     "verify": {
//       "digestAlgorithms": [
//         "sha256"
//       ],
//       "signerInfo": [
//         {
//           "cert": {
//             "serialNumber": "AAC5FC48C0FD8FBB",
//             "issuerCN": "AC ABCDEF RFB v5",
//             "issuerDN": "",
//             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//             "digestAlgName": "SHA-256"
//           },
//           "contentType": "1.2.840.113549.1.7.1",
//           "signingTime": "180607195054Z",
//           "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
//           "signingAlgOid": "1.2.840.113549.1.1.11",
//           "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
//         },
//         {
//           "cert": {
//             "serialNumber": "324FB38ABD59723F",
//             "issuerCN": "AC ABCDEF RFB v5",
//             "issuerDN": "",
//             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//             "digestAlgName": "SHA-256"
//           },
//           "contentType": "1.2.840.113549.1.7.1",
//           "signingTime": "180608182517Z",
//           "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
//           "signingAlgOid": "1.2.840.113549.1.1.11",
//           "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
//         }
//       ]
//     }
//   }
// }
// 

$dt = new CkDateTime();

$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);
    $certSerialNumber = $json->stringOf('pkcs7.verify.signerInfo[i].cert.serialNumber');
    $certIssuerCN = $json->stringOf('pkcs7.verify.signerInfo[i].cert.issuerCN');
    $certIssuerDN = $json->stringOf('pkcs7.verify.signerInfo[i].cert.issuerDN');
    $certDigestAlgOid = $json->stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgOid');
    $certDigestAlgName = $json->stringOf('pkcs7.verify.signerInfo[i].cert.digestAlgName');
    $contentType = $json->stringOf('pkcs7.verify.signerInfo[i].contentType');
    $signingTime = $json->stringOf('pkcs7.verify.signerInfo[i].signingTime');

    // The signingTime isin UTCTime format.
    // UTCTime values take the form of either "YYMMDDhhmm[ss]Z" or "YYMMDDhhmm[ss](+|-)hhmm"
    // Starting in Chilkat v9.5.0.77, the SetFromTimestamp method auto-recognizes the UTCTime format and parses it correctly.
    $success = $dt->SetFromTimestamp($signingTime);
    // To get the signingTime in other date/time formats, look at the online reference documentation for CkDateTime.
    // There are numerous methods such as GetAsDateTime, GetAsIso8601, GetAsUnixTime, GetAsRfc822, etc.

    $messageDigest = $json->stringOf('pkcs7.verify.signerInfo[i].messageDigest');
    $signingAlgOid = $json->stringOf('pkcs7.verify.signerInfo[i].signingAlgOid');
    $signerDigest = $json->stringOf('pkcs7.verify.signerInfo[i].signerDigest');
    $i = $i + 1;
}

// println crypt.LastErrorText;
print 'Success.' . "\n";

?>