Perl

Send an Email with a Digital Signature

Demonstrates the Chilkat Email.SendSigned property. Set it to true to have the email sent with a digital signature (the default is false). Signing also requires a certificate with access to its private key. This example loads that certificate (and its private key) from a PFX file with Cert.LoadPfxFile, supplies it via SetSigningCert, and enables signed sending.

Background: Signing is the mirror image of encrypting. To encrypt for a recipient you use their public certificate; to sign you use your own private key, and recipients verify with your public certificate. A signature does not hide the message — a signed email is still readable by anyone — but it proves who sent it and guarantees the content was not tampered with. A PFX (also called PKCS#12, .pfx or .p12) is a password-protected file that bundles a certificate together with its private key, making it a convenient single-file source for signing credentials.

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Perl

use chilkat();

$success = 0;

#  Demonstrates the Email.SendSigned property with a full signing setup.  Set SendSigned
#  to true to have the email sent with a digital signature.  Signing requires a certificate
#  with access to its private key, which we load here from a PFX (.pfx / .p12) file.

$email = chilkat::CkEmail->new();
$email->put_Subject("Signed email");
$email->put_Body("This message will be sent with a digital signature.");
$email->put_From('alice@example.com');
$email->AddTo("Bob",'bob@example.com');

#  Load the signing certificate (including its private key) from a PFX file.
#  The 2nd argument is the PFX password.
$cert = chilkat::CkCert->new();
$success = $cert->LoadPfxFile("qa_data/certs/signer.pfx","pfx_password");
if ($success == 0) {
    print $cert->lastErrorText() . "\r\n";
    exit;
}

#  Provide the signing certificate.
$success = $email->SetSigningCert($cert);
if ($success == 0) {
    print $email->lastErrorText() . "\r\n";
    exit;
}

#  Request that the email be sent with a digital signature.
$email->put_SendSigned(1);

print "SendSigned = " . $email->get_SendSigned() . "\r\n";

#  Note: The path "qa_data/certs/signer.pfx" is a relative local filesystem path,
#  relative to the current working directory of the running application.