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<?php
declare(strict_types=1);
namespace Jose\Component\KeyManagement;
use InvalidArgumentException;
use Jose\Component\Core\JWK;
use Jose\Component\Core\JWKSet;
use Jose\Component\Core\Util\ECKey;
use Jose\Component\KeyManagement\KeyConverter\KeyConverter;
use Jose\Component\KeyManagement\KeyConverter\RSAKey;
use OpenSSLCertificate;
use ParagonIE\ConstantTime\Base64UrlSafe;
use RuntimeException;
use Throwable;
use function array_key_exists;
use function extension_loaded;
use function is_array;
use function is_string;
use const JSON_THROW_ON_ERROR;
use const OPENSSL_KEYTYPE_RSA;
/**
* @see \Jose\Tests\Component\KeyManagement\JWKFactoryTest
*/
class JWKFactory
{
/**
* Creates a RSA key with the given key size and additional values.
*
* @param int $size The key size in bits
* @param array<string, mixed> $values values to configure the key
*/
public static function createRSAKey(int $size, array $values = []): JWK
{
if ($size % 8 !== 0) {
throw new InvalidArgumentException('Invalid key size.');
}
if ($size < 512) {
throw new InvalidArgumentException('Key length is too short. It needs to be at least 512 bits.');
}
$key = openssl_pkey_new([
'private_key_bits' => $size,
'private_key_type' => OPENSSL_KEYTYPE_RSA,
]);
if ($key === false) {
throw new InvalidArgumentException('Unable to create the key');
}
$details = openssl_pkey_get_details($key);
if (! is_array($details)) {
throw new InvalidArgumentException('Unable to create the key');
}
$rsa = RSAKey::createFromKeyDetails($details['rsa']);
$values = array_merge($values, $rsa->toArray());
return new JWK($values);
}
/**
* Creates a EC key with the given curve and additional values.
*
* @param string $curve The curve
* @param array<string, mixed> $values values to configure the key
*/
public static function createECKey(string $curve, array $values = []): JWK
{
return ECKey::createECKey($curve, $values);
}
/**
* Creates a octet key with the given key size and additional values.
*
* @param int $size The key size in bits
* @param array<string, mixed> $values values to configure the key
*/
public static function createOctKey(int $size, array $values = []): JWK
{
if ($size % 8 !== 0) {
throw new InvalidArgumentException('Invalid key size.');
}
$values = [
...$values,
'kty' => 'oct',
'k' => Base64UrlSafe::encodeUnpadded(random_bytes($size / 8)),
];
return new JWK($values);
}
/**
* Creates a OKP key with the given curve and additional values.
*
* @param string $curve The curve
* @param array<string, mixed> $values values to configure the key
*/
public static function createOKPKey(string $curve, array $values = []): JWK
{
if (! extension_loaded('sodium')) {
throw new RuntimeException('The extension "sodium" is not available. Please install it to use this method');
}
switch ($curve) {
case 'X25519':
$keyPair = sodium_crypto_box_keypair();
$d = sodium_crypto_box_secretkey($keyPair);
$x = sodium_crypto_box_publickey($keyPair);
break;
case 'Ed25519':
$keyPair = sodium_crypto_sign_keypair();
$secret = sodium_crypto_sign_secretkey($keyPair);
$secretLength = mb_strlen($secret, '8bit');
$d = mb_substr($secret, 0, -$secretLength / 2, '8bit');
$x = sodium_crypto_sign_publickey($keyPair);
break;
default:
throw new InvalidArgumentException(sprintf('Unsupported "%s" curve', $curve));
}
$values = [
...$values,
'kty' => 'OKP',
'crv' => $curve,
'd' => Base64UrlSafe::encodeUnpadded($d),
'x' => Base64UrlSafe::encodeUnpadded($x),
];
return new JWK($values);
}
/**
* Creates a none key with the given additional values. Please note that this key type is not pat of any
* specification. It is used to prevent the use of the "none" algorithm with other key types.
*
* @param array<string, mixed> $values values to configure the key
*/
public static function createNoneKey(array $values = []): JWK
{
$values = [
...$values,
'kty' => 'none',
'alg' => 'none',
'use' => 'sig',
];
return new JWK($values);
}
/**
* Creates a key from a Json string.
*/
public static function createFromJsonObject(string $value): JWK|JWKSet
{
$json = json_decode($value, true, 512, JSON_THROW_ON_ERROR);
if (! is_array($json)) {
throw new InvalidArgumentException('Invalid key or key set.');
}
return self::createFromValues($json);
}
/**
* Creates a key or key set from the given input.
*/
public static function createFromValues(array $values): JWK|JWKSet
{
if (array_key_exists('keys', $values) && is_array($values['keys'])) {
return JWKSet::createFromKeyData($values);
}
return new JWK($values);
}
/**
* This method create a JWK object using a shared secret.
*/
public static function createFromSecret(string $secret, array $additional_values = []): JWK
{
$values = array_merge(
$additional_values,
[
'kty' => 'oct',
'k' => Base64UrlSafe::encodeUnpadded($secret),
]
);
return new JWK($values);
}
/**
* This method will try to load a X.509 certificate and convert it into a public key.
*/
public static function createFromCertificateFile(string $file, array $additional_values = []): JWK
{
$values = KeyConverter::loadKeyFromCertificateFile($file);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
/**
* Extract a keyfrom a key set identified by the given index .
*/
public static function createFromKeySet(JWKSet $jwkset, int|string $index): JWK
{
return $jwkset->get($index);
}
/**
* This method will try to load a PKCS#12 file and convert it into a public key.
*/
public static function createFromPKCS12CertificateFile(
string $file,
string $secret = '',
array $additional_values = []
): JWK {
try {
$content = file_get_contents($file);
if (! is_string($content)) {
throw new RuntimeException('Unable to read the file.');
}
openssl_pkcs12_read($content, $certs, $secret);
if (! is_array($certs) || ! array_key_exists('pkey', $certs)) {
throw new RuntimeException('Unable to load the certificates.');
}
return self::createFromKey($certs['pkey'], null, $additional_values);
} catch (Throwable $throwable) {
throw new RuntimeException('Unable to load the certificates.', $throwable->getCode(), $throwable);
}
}
/**
* This method will try to convert a X.509 certificate into a public key.
*/
public static function createFromCertificate(string $certificate, array $additional_values = []): JWK
{
$values = KeyConverter::loadKeyFromCertificate($certificate);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
/**
* This method will try to convert a X.509 certificate resource into a public key.
*/
public static function createFromX509Resource(OpenSSLCertificate $res, array $additional_values = []): JWK
{
$values = KeyConverter::loadKeyFromX509Resource($res);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
/**
* This method will try to load and convert a key file into a JWK object. If the key is encrypted, the password must
* be set.
*/
public static function createFromKeyFile(string $file, ?string $password = null, array $additional_values = []): JWK
{
$values = KeyConverter::loadFromKeyFile($file, $password);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
/**
* This method will try to load and convert a key into a JWK object. If the key is encrypted, the password must be
* set.
*/
public static function createFromKey(string $key, ?string $password = null, array $additional_values = []): JWK
{
$values = KeyConverter::loadFromKey($key, $password);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
/**
* This method will try to load and convert a X.509 certificate chain into a public key.
*
* Be careful! The certificate chain is loaded, but it is NOT VERIFIED by any mean! It is mandatory to verify the
* root CA or intermediate CA are trusted. If not done, it may lead to potential security issues.
*/
public static function createFromX5C(array $x5c, array $additional_values = []): JWK
{
$values = KeyConverter::loadFromX5C($x5c);
$values = array_merge($values, $additional_values);
return new JWK($values);
}
}