(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$cert = chilkat::CkCert->new();
$success = $cert->LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

$fac = chilkat::CkFileAccess->new();

$fileBytes = chilkat::CkByteData->new();
$success = $fac->ReadEntireFile("qa_data/pdf/sample.pdf",$fileBytes);
if ($fac->get_LastMethodSuccess() != 1) {
    print $fac->lastErrorText() . "\r\n";
    exit;
}

$crypt = chilkat::CkCrypt2->new();

$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 = chilkat::CkByteData->new();
$success = $crypt->SignBytes($fileBytes,$sigBytes);
if ($crypt->get_LastMethodSuccess() != 1) {
    print $crypt->lastErrorText() . "\r\n";
    exit;
}

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

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

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