Perl

Check if a MIME Tree Contains Signed Parts

Demonstrates the Chilkat Mime.ContainsSignedParts method, which returns whether the currently visible MIME tree contains a complete detached or opaque CMS/PKCS #7 signed entity. 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: Where IsSigned asks whether the top entity is a signature wrapper, this scans the whole tree for a signed part nested anywhere inside — useful when signing is applied to a sub-part rather than the outermost entity. It is the discovery step before deciding whether verification is needed.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the Mime.ContainsSignedParts method, which returns whether the MIME tree contains a complete CMS/PKCS #7 signed entity.  It takes no arguments.

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

if ($mime->ContainsSignedParts()) {
    print "The message tree contains a signed part.\n";
} else {
    print "The message tree contains no signed part.\n";
}