(PHP Extension) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

$email = new CkEmail();

//  Provide PFX/.p12 files for any certs+keys needed for decryption.
//  Signature verification does not need anything extra.
//  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
//  on a Windows system.)
$success = $email->AddPfxSourceFile('/pfxFiles/certs_and_keys_1.pfx','pfxPassword1');
if ($success != true) {
    print $email->lastErrorText() . "\n";
    exit;
}

$success = $email->AddPfxSourceFile('/pfxFiles/certs_and_keys_2.pfx','pfxPassword2');
if ($success != true) {
    print $email->lastErrorText() . "\n";
    exit;
}

//  ...

//  Load a potentially signed and/or encrypted email.
$success = $email->LoadEml('someDir/someEmail.eml');

//  If the email was signed and/or encrypted, it was "unwrapped", i.e.
//  the email is already decrypted and in a state as if it were never signed or encrypted.

//  You may check to see if the email was received encrypted or signed, and if so,
//  whether it was successfully unwrapped and who signed or encrypted it:
if ($email->get_ReceivedEncrypted() == true) {

    print 'This email was encrypted.' . "\n";
    if ($email->get_Decrypted() == true) {
        print 'This email was successfully decrypted.  It was encrypted by:' . "\n";
        print $email->encryptedBy() . "\n";
    }
    else {
        print 'This email was not decrypted.' . "\n";
    }

}

if ($email->get_ReceivedSigned() == true) {

    print 'This email was signed.' . "\n";
    if ($email->get_SignaturesValid() == true) {
        print 'The signature was verified.  It was signed by:' . "\n";
        print $email->signedBy() . "\n";
    }
    else {
        print 'The signature verification failed.' . "\n";
    }

}

//  At this point, the contents of the email, including attachments, can be accessed normally..

?>