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<?php |
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declare(strict_types = 1); |
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namespace Sop\PKCS5; |
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use Sop\CryptoBridge\Crypto; |
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use Sop\CryptoTypes\AlgorithmIdentifier\Cipher\BlockCipherAlgorithmIdentifier; |
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use Sop\PKCS5\PBEKD\PBEKDF; |
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use Sop\PKCS5\PBEKD\PBEKDF2; |
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use Sop\PKCS5\PRF\PRF; |
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/** |
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* Implements password-based encryption scheme #2. |
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* |
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* @see https://tools.ietf.org/html/rfc2898#section-6.2 |
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*/ |
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class PBES2 extends PBEScheme |
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{ |
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/** |
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* Pseudorandom functor. |
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* |
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* @var PRF |
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*/ |
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protected $_prf; |
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/** |
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* Cipher algorithm. |
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* |
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* @var BlockCipherAlgorithmIdentifier |
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*/ |
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protected $_cipher; |
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/** |
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* Salt. |
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* |
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* @var string |
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*/ |
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protected $_salt; |
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/** |
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* Iteration count. |
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* |
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* @var int |
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*/ |
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protected $_iterationCount; |
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/** |
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* Crypto engine. |
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* |
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* @var Crypto |
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*/ |
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protected $_crypto; |
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/** |
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* Padding instance. |
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* |
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* @var Padding |
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*/ |
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protected $_padding; |
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/** |
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* Constructor. |
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* |
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* @param PRF $prf Pseudorandom functor |
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* @param BlockCipherAlgorithmIdentifier $cipher Algorithm |
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* @param string $salt Salt |
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* @param int $iteration_count Iteration count |
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* @param null|Crypto $crypto Crypto implementation, |
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* use default if not set |
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*/ |
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public function __construct(PRF $prf, BlockCipherAlgorithmIdentifier $cipher, |
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string $salt, int $iteration_count, ?Crypto $crypto = null) |
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{ |
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$this->_prf = $prf; |
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$this->_cipher = $cipher; |
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$this->_salt = $salt; |
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$this->_iterationCount = $iteration_count; |
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$this->_crypto = $crypto ?? Crypto::getDefault(); |
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$this->_padding = new Padding($cipher->blockSize()); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function encrypt(string $data, string $password): string |
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{ |
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$key = $this->kdf()->derive($password, $this->_salt, |
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$this->_iterationCount, $this->_cipher->keySize()); |
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return $this->encryptWithKey($data, $key); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function encryptWithKey(string $data, string $key): string |
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{ |
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return $this->_crypto->encrypt($this->_padding->add($data), $key, |
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$this->_cipher); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function decrypt(string $data, string $password): string |
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{ |
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$key = $this->kdf()->derive($password, $this->_salt, |
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$this->_iterationCount, $this->_cipher->keySize()); |
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return $this->decryptWithKey($data, $key); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws \UnexpectedValueException If decryption fails |
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*/ |
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public function decryptWithKey(string $data, string $key): string |
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{ |
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try { |
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$str = $this->_crypto->decrypt($data, $key, $this->_cipher); |
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return $this->_padding->remove($str); |
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} catch (\RuntimeException $e) { |
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throw new \UnexpectedValueException('Decryption failed.', 0, $e); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function kdf(): PBEKDF |
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{ |
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return new PBEKDF2($this->_prf); |
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} |
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} |
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sop /
pkcs5
