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<?php
/**
* TODO: doc
*/
class Keyring extends SimpleORMap
{
const ALGORTIHM_RS256 = 'RSA-OAEP-256';
protected static function configure($config = [])
{
$config['db_table'] = 'keyrings';
parent::configure($config);
}
/**
* TODO
*
* @param string $range_id
*
* @param string $range_type
*
* @param string $passphrase
*
* @param string $algorithm
*
* @return Keyring
*
* @throws StudipException
*/
public static function generate(
string $range_id,
string $range_type,
string $passphrase = '',
string $algorithm = self::ALGORTIHM_RS256
) : Keyring
{
if ($algorithm === self::ALGORTIHM_RS256) {
$private_key = phpseclib3\Crypt\RSA::createKey(4096);
if ($passphrase) {
$private_key = $private_key->withPassword($passphrase);
}
//Explicitly set OAEP as padding method:
$private_key->withPadding(\phpseclib\Crypt\RSA::ENCRYPTION_OAEP);
//Explicitly set sha256:
$private_key->withHash('sha256');
$public_key = $private_key->getPublicKey();
$keyring = new Keyring();
$keyring->range_id = $range_id;
$keyring->range_type = $range_type;
$keyring->private_key = $private_key;
$keyring->public_key = $public_key;
if ($passphrase) {
$hasher = UserManagement::getPwdHasher();
$keyring->passphrase = $hasher->HashPassword($passphrase);
}
if ($keyring->store()) {
return $keyring;
}
//TODO: improve exception after the „bald-rapunzel“ StEP is merged.
throw new StudipException(_('Es konnte kein Schlüsselpaar erzeugt werden.'));
} else {
//TODO: improve exception after the „bald-rapunzel“ StEP is merged.
throw new StudipException(
sprintf(
_('Der Schlüsselalgorithmus %s wird nicht unterstützt.'),
$algorithm
)
);
}
}
/**
* Generates a new keyring from a public key.
*
* @param \OAT\Library\Lti1p3Core\Security\Key\KeyInterface|string $key The public key.
*
* @param string $range_type The range type for the keyring.
*
* @param string $range_id The range-ID for the keyring.
*
* @return Keyring|null A keyring, if it can be created or null in case of failure to do so.
*/
public static function createFromPublicKey(
\OAT\Library\Lti1p3Core\Security\Key\KeyInterface|string $key,
string $range_type,
string $range_id
) : ?Keyring
{
$keyring = new Keyring();
$keyring->range_type = $range_type;
$keyring->range_id = $range_id;
if (is_string($key)) {
$keyring->public_key = $key;
} else {
//Instance of KeyInterface:
$content = $key->getContent();
if (!$content || empty($content['n']) || empty($content['e'])) {
//No key present or base or exponent missing.
return null;
}
var_dump($content['e']);
var_dump(strtr($content['e'], '-_', '+/'));
var_dump(base64_decode(strtr($content['e'], '-_', '+/')));
var_dump($content['n']);
var_dump(strtr($content['n'], '-_', '+/'));
var_dump(base64_decode(strtr($content['n'], '-_', '+/')));
$loaded_key = \phpseclib3\Crypt\RSA::loadPublicKey(
[
'e' => new \phpseclib3\Math\BigInteger(base64_decode(strtr($content['e'], '-_', '+/'))),
'n' => new \phpseclib3\Math\BigInteger(base64_decode(strtr($content['n'], '-_', '+/')))
]
);
$keyring->public_key = $loaded_key->toString('PKCS8');
var_dump($keyring->public_key);die();
}
return $keyring;
}
/**
* Converts the keyring to a KeyChain instance of the Lti1p3Core library.
*
* @return \OAT\Library\Lti1p3Core\Security\Key\KeyChain A KeyChain representation
* of the keyring.
*/
public function toKeyChain() : \OAT\Library\Lti1p3Core\Security\Key\KeyChain
{
$public_key = new \OAT\Library\Lti1p3Core\Security\Key\Key(
$this->public_key
);
//A private key is optional.
$private_key = null;
if ($this->private_key) {
$private_key = new \OAT\Library\Lti1p3Core\Security\Key\Key(
$this->private_key,
$this->passphrase ?? null
);
}
return new \OAT\Library\Lti1p3Core\Security\Key\KeyChain(
$this->id,
$this->range_id,
$public_key,
$private_key
);
}
}
|
