Sign a File to Create a .p7s File (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.

Download Chilkat Perl Module

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 component unlock failed" . "\n";
    exit;
}

#  Find our digital certificate from the Current User certificate store.
$ccs = new chilkat::CkCreateCS();

$certStore = $ccs->OpenCurrentUserStore();

$cert = $certStore->FindCertBySubjectCN("Chilkat Software, Inc.");
if ($cert eq null ) {
    print $cert->lastErrorText() . "\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:
$success = $crypt->CreateP7S("license.rtf","license.p7s");
if ($success == 0) {
    print $crypt->lastErrorText() . "\n";

    exit;
}

#  Verify the signature:
$crypt->SetVerifyCert($cert);

$success = $crypt->VerifyP7S("license.rtf","license.p7s");
if ($success == 0) {
    print $crypt->lastErrorText() . "\n";

    exit;
}

print "Success!" . "\n";