(PHP ActiveX) Sign a File to Create a .p7m File (using a PFX)

PHP ActiveX example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$crypt = new COM("Chilkat.Crypt2");

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
$signingCertSubject = 'Acme Inc';
$pfxFilename = '/Users/chilkat/testData/pfx/acme.pfx';
$pfxPassword = 'test123';

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.CertStore')
$certStore = new COM("Chilkat.CertStore");
$success = $certStore->LoadPfxFile($pfxFilename,$pfxPassword);
if ($success != 1) {
    print $certStore->LastErrorText . "\n";
    exit;
}

// cert is a Chilkat.Cert
$cert = $certStore->FindCertBySubjectCN($signingCertSubject);
if ($certStore->LastMethodSuccess == 0) {
    print 'Failed to find certificate by subject common name.' . "\n";
    exit;
}

// Tell the crypt component to use this cert.
$success = $crypt->SetSigningCert($cert);

// We can sign any type of file, creating a .p7m as output:
$inFile = '/Users/chilkat/testData/pdf/sample.pdf';
$outputFile = '/Users/chilkat/testData/p7m/sample.pdf.p7m';
$success = $crypt->CreateP7M($inFile,$outputFile);
if ($success == 0) {
    print $crypt->LastErrorText . "\n";

    exit;
}

// Verify and restore the original file:
$success = $crypt->SetVerifyCert($cert);

$inFile = $outputFile;
$outputFile = '/Users/chilkat/testData/pdf/restored.pdf';

$success = $crypt->VerifyP7M($inFile,$outputFile);
if ($success == 0) {
    print $crypt->LastErrorText . "\n";

    exit;
}

print 'Success!' . "\n";

?>