Perl Requires Chilkat v9.5.0.89+

CoSign PKCS7/CMS Signed Data

See more Digital Signatures Examples

Demonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data.

In this example, we cosign an existing pdf.p7s

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $crypt = Chilkat2::Crypt2->new;
my $cert = Chilkat2::Cert->new;

# If loading from a smart card, set the smartcard PIN.
$cert->SmartCardPin('0000');

# Load a certificate in some way, such as from a smart card.
# Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores..
my $success = $cert->LoadFromSmartcard('');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

$success = $crypt->SetSigningCert($cert);
if (!$success) {
    print $crypt->LastErrorText, "\n";
    exit;
}

# Load the file to be co-signed.
# NOTE:  This is to cosign a PDF file contained within a CMS (PKCS7) message.
# (In other words, the PDF is contained within the CMS SignedData, rather than the other way around
# where a CMS signature is contained within a PDF.  Use Chilkat's PDF class to sign a PDF, which is
# to embed a CMS signature within the PDF.)
my $bd = Chilkat2::BinData->new;
$success = $bd->LoadFile('qa_data/p7s/cosign/sample.pdf.p7s');
if (!$success) {
    print "Failed to load pdf.p7s input file.\n";
    exit;
}

# bd2 will contain the co-signed result.
my $bd2 = Chilkat2::BinData->new;
$success = $crypt->CoSign($bd, $cert, $bd2);
if (!$success) {
    print $crypt->LastErrorText, "\n";
    exit;
}

$success = $bd->WriteFile('qa_output/cosigned.pdf.p7s');
if (!$success) {
    print "Failed to save pdf.p7s output file.\n";
    exit;
}

print "Success!\n";