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<?php |
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/** |
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* The RC4-128 encryption algorithm class. |
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*/ |
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namespace CryptoManana\SymmetricEncryption; |
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use \CryptoManana\Core\Abstractions\MessageEncryption\AbstractStreamCipherAlgorithm as SymmetricStreamCipherAlgorithm; |
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/** |
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* Class Rc4 - The RC4-128 encryption algorithm object. |
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* |
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* @package CryptoManana\SymmetricEncryption |
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*/ |
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class Rc4 extends SymmetricStreamCipherAlgorithm |
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{ |
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/** |
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* The internal name of the algorithm. |
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*/ |
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const ALGORITHM_NAME = 'RC4'; |
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/** |
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* The internal secret key size measured in raw bytes length for the algorithm |
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* |
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* @internal For the current algorithm: 128 bits (16 bytes) |
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*/ |
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const KEY_SIZE = 16; |
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/** |
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* Flag to force native code polyfill realizations, if available. |
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* |
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* @var bool Flag to force native realizations. |
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*/ |
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protected $useNative = false; |
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/** |
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* Stream cipher algorithm constructor. |
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*/ |
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public function __construct() |
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{ |
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if (in_array(static::ALGORITHM_NAME, openssl_get_cipher_methods(), true)) { |
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parent::__construct(); |
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} else { |
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// @codeCoverageIgnoreStart |
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$this->useNative = true; |
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/** |
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* {@internal Serialization and initialization purposes for the default key. }} |
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*/ |
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if (strlen($this->key) < static::KEY_SIZE) { |
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$this->key = str_pad($this->key, static::KEY_SIZE, "\x0", STR_PAD_RIGHT); |
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} |
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// @codeCoverageIgnoreEnd |
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} |
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} |
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/** |
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* Encrypts the given plain data. |
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* |
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* @param string $plainData The plain input string. |
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* |
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* @return string The cipher/encrypted data. |
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* @throws \Exception Validation errors. |
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*/ |
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public function encryptData($plainData) |
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{ |
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if ($this->useNative) { |
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return parent::encryptData($plainData); |
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} else { |
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$this->validatePlainDataForEncryption($plainData); |
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$plainData = ($plainData === '') ? ' ' : $plainData; |
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$cipherData = \CryptoManana\Compatibility\NativeRc4::encryptData($this->key, $plainData); |
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return $this->changeOutputFormat($cipherData, true); |
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} |
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} |
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/** |
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* Decrypts the given cipher data. |
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* |
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* @param string $cipherData The encrypted input string. |
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* |
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* @return string The decrypted/plain data. |
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* @throws \Exception Validation errors. |
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*/ |
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public function decryptData($cipherData) |
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{ |
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if ($this->useNative) { |
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return parent::decryptData($cipherData); |
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} else { |
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$this->validateCipherDataForDecryption($cipherData); |
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$cipherData = $this->changeOutputFormat($cipherData, false); |
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return \CryptoManana\Compatibility\NativeRc4::decryptData($this->key, $cipherData); |
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} |
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} |
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} |
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TonyKaravasilev /
CryptoManana
