PHP

Add a Detached Signature (Separate Key, Header Control)

Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

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

Background: This combines the two variations — certificate and key supplied separately, plus explicit header placement — for the case that needs both. It is the most flexible of the detached-signature methods; choose it when your key material is separate and you also care about where the message headers end up on the signed result.

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<?php

use Chilkat2\Cert;
use Chilkat2\Mime;
use Chilkat2\PrivateKey;

$mime = new Mime();
try {
    $mime->SetBodyFromPlainText('This message will be signed.');

    // Load the certificate and its private key separately.
    $cert = new Cert();
    $cert->LoadFromFile('qa_data/signer.cer');

    $privKey = new PrivateKey();
    $privKey->LoadPemFile('qa_data/signer_privkey.pem');

    // Create a detached signature with separately supplied cert and private key, where the 3rd
    // argument controls whether the existing message header fields are transferred to the new outer
    // multipart/signed entity.
    $transferHeaderFields = true;
    $mime->AddDetachedSignaturePk2($cert, $privKey, $transferHeaderFields);

    $mime->SaveMime('qa_output/signed.eml');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Detached signature added (headers transferred).\n";