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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 Assert\Assertion; |
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use Base64Url\Base64Url; |
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use Jose\Object\JWKInterface; |
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/** |
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* Class PBES2AESKW. |
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*/ |
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abstract class PBES2AESKW implements KeyWrappingInterface |
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{ |
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/** |
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* @var int |
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*/ |
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private $salt_size; |
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/** |
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* @var int |
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*/ |
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private $nb_count; |
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/** |
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* @param int $salt_size |
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* @param int $nb_count |
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*/ |
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public function __construct($salt_size = 64, $nb_count = 4096) |
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{ |
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$this->salt_size = $salt_size; |
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$this->nb_count = $nb_count; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function wrapKey(JWKInterface $key, $cek, array $complete_headers, array &$additional_headers) |
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{ |
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$this->checkKey($key); |
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$this->checkHeaderAlgorithm($complete_headers); |
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$wrapper = $this->getWrapper(); |
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$hash_algorithm = $this->getHashAlgorithm(); |
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$key_size = $this->getKeySize(); |
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$salt = random_bytes($this->salt_size); |
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$password = Base64Url::decode($key->get('k')); |
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// We set headers parameters |
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$additional_headers['p2s'] = Base64Url::encode($salt); |
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$additional_headers['p2c'] = $this->nb_count; |
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$derived_key = hash_pbkdf2($hash_algorithm, $password, $complete_headers['alg']."\x00".$salt, $this->nb_count, $key_size, true); |
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return $wrapper->wrap($derived_key, $cek); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function unwrapKey(JWKInterface $key, $encrypted_cek, array $header) |
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{ |
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$this->checkKey($key); |
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$this->checkHeaderAlgorithm($header); |
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$this->checkHeaderAdditionalParameters($header); |
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$wrapper = $this->getWrapper(); |
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$hash_algorithm = $this->getHashAlgorithm(); |
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$key_size = $this->getKeySize(); |
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$salt = $header['alg']."\x00".Base64Url::decode($header['p2s']); |
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$count = $header['p2c']; |
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$password = Base64Url::decode($key->get('k')); |
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$derived_key = hash_pbkdf2($hash_algorithm, $password, $salt, $count, $key_size, true); |
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return $wrapper->unwrap($derived_key, $encrypted_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 JWKInterface $key |
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*/ |
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protected function checkKey(JWKInterface $key) |
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{ |
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Assertion::eq($key->get('kty'), 'oct', 'Wrong key type.'); |
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Assertion::true($key->has('k'), 'The key parameter "k" is missing.'); |
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} |
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/** |
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* @param array $header |
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*/ |
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protected function checkHeaderAlgorithm(array $header) |
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{ |
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Assertion::keyExists($header, 'alg', 'The header parameter "alg" is missing.'); |
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Assertion::notEmpty($header['alg'], 'The header parameter "alg" is not valid.'); |
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} |
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/** |
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* @param array $header |
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*/ |
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protected function checkHeaderAdditionalParameters(array $header) |
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{ |
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Assertion::keyExists($header, 'p2s', 'The header parameter "p2s" is missing.'); |
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Assertion::notEmpty($header['p2s'], 'The header parameter "p2s" is not valid.'); |
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Assertion::keyExists($header, 'p2c', 'The header parameter "p2c" is missing.'); |
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Assertion::notEmpty($header['p2c'], 'The header parameter "p2c" is not valid.'); |
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} |
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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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* @return string |
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*/ |
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abstract protected function getHashAlgorithm(); |
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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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Spomky-Labs /
jose
