/**
* {@inheritDoc}
* @see \Mdanter\Ecc\Serializer\PrivateKeySerializerInterface::parse()
*/
public function parse($formattedKey)
{
$formattedKey = str_replace('-----BEGIN EC PRIVATE KEY-----', '', $formattedKey);
$formattedKey = str_replace('-----END EC PRIVATE KEY-----', '', $formattedKey);
$data = base64_decode($formattedKey);
return $this->derSerializer->parse($data);
}
/**
* @return Binary
*/
public function generateKey()
{
$generator = EccFactory::getNistCurves()->generator256();
$key = $generator->createPrivateKey();
$serializer = new DerPrivateKeySerializer();
$serialized = $serializer->serialize($key);
return new Binary($serialized);
}
/**
* @param string $data
* @param string $password
* @return EncryptedPrivateKey
*/
public function unserialize($data, $password)
{
$comments = [];
$short = '';
foreach (explode("\n", $data) as $line) {
if (strpos($line, ":") !== false) {
$comment = explode(":", $line);
if (count($comment) === 2) {
$comments[$comment[0]] = trim($comment[1]);
}
} else {
$short .= $line . "\n";
}
}
if (!isset($comments['DEK-Info']) || !isset($comments['Proc-Type'])) {
throw new \RuntimeException('Missing headers for encryption');
}
list($cipher, $iv) = $this->parseDekInfo($comments['DEK-Info']);
list($proc1, $proc2) = $this->parseProcType($comments['Proc-Type']);
$short = str_replace('-----BEGIN EC PRIVATE KEY-----', '', $short);
$short = str_replace('-----END EC PRIVATE KEY-----', '', $short);
$ciphertext = base64_decode($short);
$key = md5($password . substr($iv, 0, 8), true);
$result = openssl_decrypt($ciphertext, $cipher, $key, OPENSSL_RAW_DATA, $iv);
if ($result === false) {
throw new \RuntimeException('Decryption failed');
}
$privateKey = $this->derSerializer->parse($result);
return new EncryptedPrivateKey($privateKey, $cipher, $iv);
}
/**
* {@inheritDoc}
* @see \Mdanter\Ecc\Serializer\PrivateKeySerializerInterface::serialize()
*/
public function getPrivateKeyInfo(PrivateKeyInterface $key)
{
$keyData = $this->serializer->serialize($key);
$privateKeyInfo = new Sequence(new Integer(self::VERSION), new Sequence(new ObjectIdentifier(DerPublicKeySerializer::X509_ECDSA_OID), CurveOidMapper::getCurveOid($key->getPoint()->getCurve())), new OctetString(bin2hex($keyData)));
return $privateKeyInfo;
}
