Perl

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
# access to its private key) for decrypting a received encrypted email.  Set the cert
# before loading the encrypted email so it can be decrypted automatically.

my $email = Chilkat2::Email->new;

# Load a certificate together with its private key from a PFX file.
my $cert = Chilkat2::Cert->new;
my $success = $cert->LoadPfxFile('qa_data/certs/decryption.pfx', 'pfx_password');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

# Provide the certificate to use for decryption.
$success = $email->SetDecryptCert($cert);
if (!$success) {
    print $email->LastErrorText, "\n";
    exit;
}

# Load the encrypted email; Chilkat decrypts it using the certificate.
$success = $email->LoadEml('qa_data/eml/encrypted.eml');
if (!$success) {
    print $email->LastErrorText, "\n";
    exit;
}

print 'ReceivedEncrypted = ', ($email->ReceivedEncrypted ? 1 : 0), "\n";
print 'Decrypted = ', ($email->Decrypted ? 1 : 0), "\n";

# Note: Paths such as "qa_data/..." are relative local filesystem paths,
# relative to the current working directory of the running application.