PHP

Create an Opaque Signature with a Separate Private Key

Demonstrates the Chilkat Mime.ConvertToSignedPk method, which creates an opaque signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

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: The separate-key form of ConvertToSigned, for when the certificate and private key are not bundled together. It produces the same opaque CMS signed-data result; only the source of the key material differs.

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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 an opaque signature when the certificate and private key are supplied separately.  The
    // 1st argument is the signer certificate and the 2nd is its private key.
    $mime->ConvertToSignedPk($cert, $privKey);

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

echo "Message converted to an opaque signed message.\n";