PHP

Export an Encrypted PKCS #8 Private Key as Encoded Text

Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. The cipher is selected by Pkcs8EncryptAlg.

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 encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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<?php

use Chilkat2\PrivateKey;

// Load a private key to export.
$privKey = new PrivateKey();
try {
    $privKey->LoadPemFile('qa_data/private.pem');

    // The key password is not hard-coded in a real application; obtain it from an interactive
    // prompt, environment variable, or a secrets vault.
    $password = 'myKeyPassword';

    // Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
    // argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
    // Pkcs8EncryptAlg property.
    $encoded = $privKey->GetPkcs8EncryptedENC('base64', $password);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $encoded, "\n";