PHP

Load an Encrypted PKCS #8 Private Key File

Demonstrates the Chilkat PrivateKey.LoadPkcs8EncryptedFile method, which loads a private key from a file, using a password when the key is encrypted. The first argument is the file path and the second is the password. It handles encrypted PKCS #8 DER or PEM, and unencrypted forms.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Encrypted PKCS #8 is the standard way to store a password-protected key in either binary DER or Base64 PEM. This loader decrypts both, and because it also accepts unencrypted input it is a robust choice when a PKCS #8 file may or may not be encrypted. As always, source the password securely.

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<?php

use Chilkat2\PrivateKey;

// Demonstrates the PrivateKey.LoadPkcs8EncryptedFile method, which loads a private key from a
// file, using a password when the key is encrypted.  The 1st argument is the file path and the
// 2nd is the password.  It handles encrypted PKCS #8 DER or PEM, as well as unencrypted forms.

$privKey = new PrivateKey();

// 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';

try {
    $privKey->LoadPkcs8EncryptedFile('qa_data/private_pkcs8_enc.der', $password);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Loaded a ', $privKey->KeyType, " private key.\n";