Perl

Send Encrypted Email with a Selected Algorithm (AES, 3DES, etc.)

Sends an encrypted email using the recipient's digital certificate from a .cer file, and chooses 3DES for the encryption algorithm. (It is also possible to send AES encrypted email w/ 128-bit, 192-bit, or 256-bit encryption simply by setting the Pkcs7CryptAlg and Pkcs7KeyLength properties.) Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

# The mailman object is used for sending and receiving email.
my $mailman = Chilkat2::MailMan->new;

# Set the SMTP server.
$mailman->SmtpHost('smtp.mymailserver.com');

# Load the .cer file into a certificate object.
# When sending S/MIME encrypted email, it is the recipient's
# certificate that is used for encryption.  Only the public key
# is needed to encrypt.  The recipient is the only
# one possessing the private key, and therefore is the only
# one able to decrypt.
my $cert = Chilkat2::Cert->new;
my $success = $cert->LoadFromFile('cknotes.cer');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

# Create a new email object
my $email = Chilkat2::Email->new;

$email->Subject('This email is encrypted');
$email->Body('This is a digitally encrypted mail');
$email->From('Chilkat Support <support@chilkatsoft.com>');
$success = $email->AddTo('Chilkat Blog', 'admin@cknotes.com');

# Indicate that the email is to be sent encrypted.
$email->SendEncrypted(1);

# Specify the certificate to be used for encryption.
$success = $email->SetEncryptCert($cert);

# If desired, specify the encryption algorithm to be used.
# The Pkcs7CryptAlg property can be set to "aes", "des", "3des", or "rc2"
$email->Pkcs7CryptAlg('3des');

# If desired, set the key length (in bits) for the encryption algorithm:
# The possible values allowed depend on the Pkcs7CryptAlg property.
# For "aes", the key length may be 128, 192, or 256.
# For "3des" the key length must be 192.
# For "des" the key length must be 40.
# For "rc2" the key length can be 40, 56, 64, or 128.
$email->Pkcs7KeyLength(192);

$success = $mailman->SendEmail($email);
if (!$success) {
    print $mailman->LastErrorText, "\n";
} else {
    print "Mail Sent!\n";
}