PHP ActiveX Requires Chilkat v11.0.0+

Verify a .p7m and get Algorithm Information

See more Digital Signatures Examples

Demonstrates how to verify a .p7m and then examine the algorithms used by the signature. PHP ActiveX

<?php

$success = 0;

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

$crypt = new COM("Chilkat.Crypt2");

$inFile = 'qa_data/p7m/brainpoolP256r1.p7m';
$outFile = 'qa_output/something.dat';

//  Verify and extract the signed data.
$success = $crypt->VerifyP7M($inFile,$outFile);
if ($success == 0) {
    print $crypt->LastErrorText . "\n";
    exit;
}

//  Examine details about the signature(s)
$json = new COM("Chilkat.JsonObject");
$crypt->GetLastJsonData($json);
$json->EmitCompact = 0;
print $json->emit() . "\n";

//  Sample output

//  {
//    "pkcs7": {
//      "verify": {
//        "digestAlgorithms": [
//          "sha256"
//        ],
//        "signerInfo": [
//          {
//            "cert": {
//              "serialNumber": "FFFFE552B302FFFFFF1E34C3ACEB2FFFF",
//              "issuerCN": "The common name of the cert...",
//              "issuerDN": "",
//              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//              "digestAlgName": "SHA256"
//            },
//            "contentType": "1.2.840.113549.1.7.1",
//            "signingTime": "190409140500Z",
//            "messageDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
//            "signingAlgOid": "1.2.840.10045.4.3.2",
//            "signerDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
//            "authAttr": [
//              {
//                "oid": "1.2.840.113549.1.9.3",
//                "oidName": "contentType"
//              },
//              {
//                "oid": "1.2.840.113549.1.9.5",
//                "oidName": "signingTime"
//              },
//              {
//                "oid": "1.2.840.113549.1.9.52",
//                "oidName": "1.2.840.113549.1.9.52",
//                "der": "MBs ... AwI="
//              },
//              {
//                "oid": "1.2.840.113549.1.9.4",
//                "oidName": "messageDigest"
//              },
//              {
//                "oid": "1.2.840.113549.1.9.16.2.47",
//                "oidName": "signingCertificateV2",
//                "der": "MCYw .. 7PlQ=="
//              },
//              {
//                "oid": "1.2.840.113549.1.9.20",
//                "oidName": "1.2.840.113549.1.9.20"
//              }
//            ]
//          }
//        ]
//      }
//    }
//  }

//  Code for parsing the above JSON...

$i = 0;
$count_i = $json->SizeOfArray('pkcs7.verify.digestAlgorithms');
while ($i < $count_i) {
    $json->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->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');
    $messageDigest = $json->stringOf('pkcs7.verify.signerInfo[i].messageDigest');
    $signingAlgOid = $json->stringOf('pkcs7.verify.signerInfo[i].signingAlgOid');
    $signerDigest = $json->stringOf('pkcs7.verify.signerInfo[i].signerDigest');
    $j = 0;
    $count_j = $json->SizeOfArray('pkcs7.verify.signerInfo[i].authAttr');
    while ($j < $count_j) {
        $json->J = $j;
        $oid = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr[j].oid');
        $oidName = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr[j].oidName');
        $der = $json->stringOf('pkcs7.verify.signerInfo[i].authAttr[j].der');
        $j = $j + 1;
    }

    $i = $i + 1;
}

print 'Success!' . "\n";

?>