Create an Opaque Signature with a Separate Private Key

See more MIME Examples

Demonstrates the Chilkat Mime.ConvertToSignedPk method, which creates an opaque signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

use strict;
use warnings;
use Chilkat2;

my $mime = Chilkat2::Mime->new;
my $success = $mime->SetBodyFromPlainText('This message will be signed.');
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

# Load the certificate and its private key separately.
my $cert = Chilkat2::Cert->new;
$success = $cert->LoadFromFile('qa_data/signer.cer');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

my $privKey = Chilkat2::PrivateKey->new;
$success = $privKey->LoadPemFile('qa_data/signer_privkey.pem');
if (!$success) {
    print $privKey->LastErrorText, "\n";
    exit;
}

# Create an opaque signature when the certificate and private key are supplied separately.  The
# 1st argument is the signer certificate and the 2nd is its private key.
$success = $mime->ConvertToSignedPk($cert, $privKey);
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

$success = $mime->SaveMime('qa_output/signed_opaque.eml');
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

print "Message converted to an opaque signed message.\n";