(PHP ActiveX) Sign a Byte Array to Create a Detached Signature in a Byte Array

Signs data contained in a byte array to produce a detached signature (also in a byte array). Also shows how to verify the signature.

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.Cert')
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadPfxFile('qa_data/pfx/cert_test123.pfx','test123');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

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

$fileBytes = $fac->ReadEntireFile('qa_data/pdf/sample.pdf');
if ($fac->LastMethodSuccess != 1) {
    print $fac->LastErrorText . "\n";
    exit;
}

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

$success = $crypt->SetSigningCert($cert);

// We can sign any type of file.
// The result is a detached signature (a signature that does not contain the data being signed).

$sigBytes = $crypt->SignBytes($fileBytes);
if ($crypt->LastMethodSuccess != 1) {
    print $crypt->LastErrorText . "\n";
    exit;
}

$success = $fac->WriteEntireFile('qa_output/sample.pdf.p7s',$sigBytes);
if ($fac->LastMethodSuccess != 1) {
    print $fac->LastErrorText . "\n";
    exit;
}

// We can verify the detached signature like this
$verified = $crypt->VerifyBytes($fileBytes,$sigBytes);
if ($crypt->LastMethodSuccess != 1) {
    print $crypt->LastErrorText . "\n";
    exit;
}

print 'Verified = ' . $verified . "\n";

?>