(PHP Extension) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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();

// Load the PEM containing cert + private key.
$pem = new CkPem();
$success = $pem->LoadPemFile('qa_data/pem/myPem.pem','password');
if ($success != true) {
    print $pem->lastErrorText() . "\n";
    exit;
}

// privkey is a CkPrivateKey
$privkey = $pem->GetPrivateKey(0);
if ($pem->get_LastMethodSuccess() != true) {
    print $pem->lastErrorText() . "\n";
    exit;
}

// cert is a CkCert
$cert = $pem->GetCert(0);
if ($pem->get_LastMethodSuccess() != true) {

    print $pem->lastErrorText() . "\n";
    exit;
}

$success = $crypt->SetSigningCert2($cert,$privkey);
if ($success != true) {

    print $crypt->lastErrorText() . "\n";
    exit;
}

// Alternatively, we could use a .pfx/.p12 file.
// (Chilkat also supports other formats/sources for cert/private keys...)
$certFromP12 = new CkCert();
$success = $certFromP12->LoadPfxFile('qa_data/p12/myP12.p12','password');
if ($success != true) {
    print $certFromP12->lastErrorText() . "\n";
    exit;
}

// The certificate, when loaded from a .pfx/.p12, will automatically 
// include the associated private key, assuming it's present in the .p12.
// We don't have to explicitly provide the private key as in the
// lines of code above that use the PEM file.
$success = $crypt->SetSigningCert($certFromP12);
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
$success = $crypt->CreateP7M('qa_data/infile.anything','qa_output/outfile.p7m');
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>