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<?php |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2016 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Algorithm\KeyEncryption; |
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use Base64Url\Base64Url; |
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use Jose\Object\JWK; |
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use Jose\Object\JWKInterface; |
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use Jose\Util\ConcatKDF; |
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use Mdanter\Ecc\EccFactory; |
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use Mdanter\Ecc\Message\MessageFactory; |
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/** |
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* Class ECDHES. |
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*/ |
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final class ECDHES implements KeyAgreementInterface |
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{ |
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/** |
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* @var \Mdanter\Ecc\Math\MathAdapterInterface |
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*/ |
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private $adapter; |
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/** |
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* |
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*/ |
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public function __construct() |
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{ |
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$this->adapter = EccFactory::getAdapter(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getAgreementKey($encryption_key_length, JWKInterface $private_key, JWKInterface $public_key = null, array $complete_header = [], array &$additional_header_values = []) |
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{ |
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$this->checkKey($private_key, true); |
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if (null === $public_key) { |
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$public_key = $this->getPublicKey($complete_header); |
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} else { |
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$this->checkKey($public_key, false); |
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$additional_header_values = array_merge($additional_header_values, [ |
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'epk' => [ |
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'kty' => $private_key->get('kty'), |
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'crv' => $private_key->get('crv'), |
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'x' => $private_key->get('x'), |
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'y' => $private_key->get('y'), |
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], |
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]); |
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} |
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if ($private_key->get('crv') !== $public_key->get('crv')) { |
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throw new \InvalidArgumentException('Curves are different'); |
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} |
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$agreed_key = $this->calculateAgreementKey($private_key, $public_key); |
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$apu = array_key_exists('apu', $complete_header) ? $complete_header['apu'] : ''; |
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$apv = array_key_exists('apv', $complete_header) ? $complete_header['apv'] : ''; |
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return ConcatKDF::generate($this->convertDecToBin($agreed_key), $complete_header['enc'], $encryption_key_length, $apu, $apv); |
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} |
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/** |
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* @param \Jose\Object\JWKInterface $private_key |
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* @param \Jose\Object\JWKInterface $public_key |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return int|string|void |
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*/ |
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public function calculateAgreementKey(JWKInterface $private_key, JWKInterface $public_key) |
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{ |
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$p = $this->getGenerator($private_key); |
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$rec_x = $this->convertBase64ToDec($public_key->get('x')); |
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$rec_y = $this->convertBase64ToDec($public_key->get('y')); |
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$sen_d = $this->convertBase64ToDec($private_key->get('d')); |
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$private_key = $p->getPrivateKeyFrom($sen_d); |
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$public_key = $p->getPublicKeyFrom($rec_x, $rec_y); |
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$message = new MessageFactory($this->adapter); |
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$exchange = $private_key->createExchange($message, $public_key); |
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return $exchange->calculateSharedKey(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getAlgorithmName() |
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{ |
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return 'ECDH-ES'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getKeyManagementMode() |
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{ |
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return self::MODE_AGREEMENT; |
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} |
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/** |
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* @param array $complete_header |
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* |
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* @return \Jose\Object\JWKInterface |
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*/ |
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private function getPublicKey(array $complete_header) |
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{ |
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if (!array_key_exists('epk', $complete_header)) { |
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throw new \InvalidArgumentException('"epk" parameter missing'); |
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} |
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if (!is_array($complete_header['epk'])) { |
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throw new \InvalidArgumentException('"epk" parameter is not an array of parameter'); |
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} |
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$public_key = new JWK($complete_header['epk']); |
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$this->checkKey($public_key, false); |
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return $public_key; |
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} |
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/** |
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* @param \Jose\Object\JWKInterface $key |
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* @param bool $is_private |
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*/ |
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private function checkKey(JWKInterface $key, $is_private) |
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{ |
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if ('EC' !== $key->get('kty')) { |
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throw new \InvalidArgumentException('The key type must be "EC"'); |
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} |
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if (!$key->has('x') || !$key->has('y') || !$key->has('crv')) { |
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throw new \InvalidArgumentException('Key components ("x", "y" or "crv") missing'); |
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} |
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if (!$key->has('d') && true === $is_private) { |
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throw new \InvalidArgumentException('The key must be private'); |
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} |
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} |
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/** |
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* @param JWKInterface $key |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return \Mdanter\Ecc\Primitives\GeneratorPoint |
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*/ |
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private function getGenerator(JWKInterface $key) |
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{ |
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$crv = $key->get('crv'); |
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switch ($crv) { |
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case 'P-256': |
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return EccFactory::getNistCurves()->generator256(); |
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case 'P-384': |
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return EccFactory::getNistCurves()->generator384(); |
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case 'P-521': |
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return EccFactory::getNistCurves()->generator521(); |
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default: |
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throw new \InvalidArgumentException(sprintf('Curve "%s" is not supported', $crv)); |
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} |
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} |
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/** |
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* @param $value |
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* |
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* @return int|string |
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*/ |
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private function convertHexToDec($value) |
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{ |
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return $this->adapter->hexDec($value); |
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} |
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/** |
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* @param $value |
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* |
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* @return int|string |
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*/ |
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private function convertBase64ToDec($value) |
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{ |
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$value = unpack('H*', Base64Url::decode($value)); |
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return $this->convertHexToDec($value[1]); |
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} |
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/** |
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* @param $value |
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* |
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* @return string |
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*/ |
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private function convertDecToBin($value) |
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{ |
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$adapter = EccFactory::getAdapter(); |
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return hex2bin($adapter->decHex($value)); |
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} |
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} |
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Spomky-Labs /
jose
