Perl

Check if a MIME Entity is Encrypted (S/MIME)

Demonstrates the Chilkat Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper. It takes no arguments.

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

Background: This tells you a message is encrypted and must be decrypted before its real content is available — the trigger for supplying a recipient certificate and private key to Decrypt. Reading the body without decrypting first would just yield the opaque PKCS #7 blob.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper.  It takes no arguments.

my $mime = Chilkat2::Mime->new;
my $success = $mime->LoadMimeFile('qa_data/encrypted.eml');
if (!$success) {
    print $mime->LastErrorText, "\n";
    exit;
}

if ($mime->IsEncrypted()) {
    print "This is an encrypted S/MIME message.\n";
} else {
    print "This is not an encrypted S/MIME message.\n";
}