Sign a File to Create a .p7s (Detached Signature)

Perl example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

 Chilkat Perl Module Downloads for Windows, Linux, and MAC OS X

use chilkat();

$crypt = new chilkat::CkCrypt2();

#  Any string argument automatically begins the 30-day trial.
$success = $crypt->UnlockComponent("30-day trial");
if ($success != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

#  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";

$certStore = new chilkat::CkCertStore();
$success = $certStore->LoadPfxFile($pfxFilename,$pfxPassword);
if ($success != 1) {
    print $certStore->lastErrorText() . "\r\n";
    exit;
}

# cert is a CkCert
$cert = $certStore->FindCertBySubjectCN($signingCertSubject);
if ($cert eq null ) {
    print "Failed to find certificate by subject common name." . "\r\n";
    exit;
}

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

#  We can sign any type of file, creating a .p7s as output:
$inFile = "/Users/chilkat/testData/pdf/sample.pdf";
$sigFile = "/Users/chilkat/testData/p7s/sample.p7s";

$success = $crypt->CreateP7S($inFile,$sigFile);
if ($success == 0) {
    print $crypt->lastErrorText() . "\r\n";

    exit;
}

$success = $crypt->VerifyP7S($inFile,$sigFile);
if ($success == 0) {
    print $crypt->lastErrorText() . "\r\n";

    exit;
}

print "Success!" . "\n";