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<?php |
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/** |
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* The symmetric stream cipher encryption algorithm abstraction specification. |
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*/ |
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namespace CryptoManana\Core\Abstractions\MessageEncryption; |
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use \CryptoManana\Core\Abstractions\MessageEncryption\AbstractSymmetricEncryptionAlgorithm as SymmetricCipherAlgorithm; |
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use \CryptoManana\Core\Interfaces\MessageEncryption\ObjectEncryptionInterface as ObjectEncryption; |
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use \CryptoManana\Core\Interfaces\MessageEncryption\FileEncryptionInterface as FileEncryption; |
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use \CryptoManana\Core\Traits\MessageEncryption\ObjectEncryptionTrait as EncryptObjects; |
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use \CryptoManana\Core\Traits\MessageEncryption\FileEncryptionTrait as EncryptFiles; |
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/** |
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* Class AbstractStreamCipherAlgorithm - The symmetric stream cipher algorithm abstraction representation. |
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* |
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* @package CryptoManana\Core\Abstractions\MessageEncryption |
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* |
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* @mixin EncryptObjects |
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* @mixin EncryptFiles |
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*/ |
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abstract class AbstractStreamCipherAlgorithm extends SymmetricCipherAlgorithm implements |
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ObjectEncryption, |
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FileEncryption |
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{ |
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/** |
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* Object encryption and decryption capabilities. |
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* |
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* {@internal Reusable implementation of `ObjectEncryptionInterface`. }} |
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*/ |
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use EncryptObjects; |
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/** |
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* File content encryption and decryption capabilities. |
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* |
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* {@internal Reusable implementation of `FileEncryptionInterface`. }} |
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*/ |
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use EncryptFiles; |
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/** |
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* Fetch the correctly formatted internal encryption algorithm method name. |
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* |
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* @return string The symmetric encryption algorithm standard. |
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*/ |
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protected function fetchAlgorithmMethodName() |
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{ |
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return static::ALGORITHM_NAME; |
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} |
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/** |
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* Internal method for the validation of plain data used at encryption operations. |
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* |
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* @param string $plainData The plain input string. |
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* |
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* @throws \Exception Validation errors. |
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*/ |
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protected function validatePlainDataForEncryption($plainData) |
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{ |
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if (!is_string($plainData)) { |
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throw new \InvalidArgumentException('The data for encryption must be a string or a binary string.'); |
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} |
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} |
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/** |
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* Internal method for the validation of cipher data used at decryption operations. |
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* |
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* @param string $cipherData The encrypted input string. |
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* |
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* @throws \Exception Validation errors. |
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*/ |
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protected function validateCipherDataForDecryption($cipherData) |
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{ |
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if (!is_string($cipherData)) { |
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throw new \InvalidArgumentException('The data for decryption must be a string or a binary string.'); |
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} elseif ($cipherData === '') { |
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throw new \InvalidArgumentException('The string is empty and there is nothing to decrypt from it.'); |
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} |
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} |
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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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/** |
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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($this->key, static::KEY_SIZE, "\x0", STR_PAD_RIGHT); |
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} |
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// @codeCoverageIgnoreStart |
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if (!in_array($this->fetchAlgorithmMethodName(), openssl_get_cipher_methods(), true)) { |
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throw new \RuntimeException( |
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'The algorithm `' . |
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$this->fetchAlgorithmMethodName() . |
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'`is not supported under the current system configuration.' |
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); |
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} |
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// @codeCoverageIgnoreEnd |
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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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$this->validatePlainDataForEncryption($plainData); |
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$plainData = ($plainData === '') ? ' ' : $plainData; |
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$cipherData = openssl_encrypt($plainData, $this->fetchAlgorithmMethodName(), $this->key, OPENSSL_RAW_DATA, ''); |
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return $this->changeOutputFormat($cipherData, true); |
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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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$this->validateCipherDataForDecryption($cipherData); |
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$cipherData = $this->changeOutputFormat($cipherData, false); |
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$plainData = openssl_decrypt($cipherData, $this->fetchAlgorithmMethodName(), $this->key, OPENSSL_RAW_DATA, ''); |
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return ($plainData === false) ? '' : $plainData; |
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} |
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/** |
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* Get debug information for the class instance. |
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* |
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* @return array Debug information. |
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*/ |
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public function __debugInfo() |
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{ |
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return [ |
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'standard' => static::ALGORITHM_NAME, |
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'type' => 'symmetrical encryption or two-way stream cipher', |
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'key size in bits' => static::KEY_SIZE * 8, |
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'secret key' => $this->key, |
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'internal algorithm full name' => $this->fetchAlgorithmMethodName(), |
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'internal long data digestion algorithm' => 'HKDF-SHA-2-128', |
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]; |
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} |
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} |
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TonyKaravasilev /
CryptoManana
