Perl

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
# corresponding private key (as separate objects) for decrypting a received encrypted
# email.  Set them before loading the encrypted email.

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

# Load the certificate (public) and the matching private key from separate files.
my $cert = Chilkat2::Cert->new;
my $success = $cert->LoadFromFile('qa_data/certs/recipient.cer');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

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

# Provide the certificate and private key to use for decryption.
$success = $email->SetDecryptCert2($cert, $privKey);
if (!$success) {
    print $email->LastErrorText, "\n";
    exit;
}

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

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.