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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) 2014-2015 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\JWKInterface; |
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use Jose\Util\StringUtil; |
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/** |
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* Class AESKW. |
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*/ |
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abstract class AESKW implements KeyWrappingInterface |
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{ |
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/** |
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* @param \Jose\Object\JWKInterface $key |
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* @param string $cek |
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* @param array $header |
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* |
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* @return mixed |
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*/ |
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public function wrapKey(JWKInterface $key, $cek, array &$header) |
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{ |
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$this->checkKey($key); |
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$wrapper = $this->getWrapper(); |
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return $wrapper->wrap(Base64Url::decode($key->get('k')), $cek); |
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} |
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/** |
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* @param \Jose\Object\JWKInterface $key |
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* @param string $encryted_cek |
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* @param array $header |
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* |
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* @return mixed |
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*/ |
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public function unwrapKey(JWKInterface $key, $encryted_cek, array $header) |
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{ |
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$this->checkKey($key); |
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$wrapper = $this->getWrapper(); |
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return $wrapper->unwrap(Base64Url::decode($key->get('k')), $encryted_cek); |
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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_WRAP; |
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} |
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/** |
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* @param \Jose\Object\JWKInterface $key |
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*/ |
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protected function checkKey(JWKInterface $key) |
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{ |
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if ('oct' !== $key->get('kty') || !$key->has('k')) { |
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throw new \InvalidArgumentException('The key is not valid'); |
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} |
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if ($this->getKeySize() !== StringUtil::strlen(Base64Url::decode($key->get('k')))) { |
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throw new \InvalidArgumentException('The key size is not valid'); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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abstract protected function getKeySize(); |
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/** |
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* @return \AESKW\A128KW|\AESKW\A192KW|\AESKW\A256KW |
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*/ |
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abstract protected function getWrapper(); |
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} |
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Spomky-Labs /
jose
