PHP ActiveX

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

Chilkat PHP ActiveX Downloads

Download Chilkat for PHP ActiveX

PHP ActiveX

<?php

$success = 0;

//  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
//  access to its private key) for decrypting a received encrypted email.  Set the cert
//  before loading the encrypted email so it can be decrypted automatically.

$email = new COM("Chilkat.Email");

//  Load a certificate together with its private key from a PFX file.
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadPfxFile('qa_data/certs/decryption.pfx','pfx_password');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

//  Provide the certificate to use for decryption.
$success = $email->SetDecryptCert($cert);
if ($success == 0) {
    print $email->LastErrorText . "\n";
    exit;
}

//  Load the encrypted email; Chilkat decrypts it using the certificate.
$success = $email->LoadEml('qa_data/eml/encrypted.eml');
if ($success == 0) {
    print $email->LastErrorText . "\n";
    exit;
}

print 'ReceivedEncrypted = ' . $email->ReceivedEncrypted . "\n";
print 'Decrypted = ' . $email->Decrypted . "\n";

//  Note: Paths such as "qa_data/..." are relative local filesystem paths,
//  relative to the current working directory of the running application.

?>