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<?php |
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/** |
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* The 3DES-168 (T-DES) encryption algorithm class. |
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*/ |
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namespace CryptoManana\SymmetricEncryption; |
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use CryptoManana\Core\Abstractions\MessageEncryption\AbstractBlockCipherAlgorithm as SymmetricBlockCipherAlgorithm; |
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/** |
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* Class TripleDes - The 3DES-168 (T-DES) encryption algorithm object. |
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* |
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* @package CryptoManana\SymmetricEncryption |
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*/ |
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class TripleDes extends SymmetricBlockCipherAlgorithm |
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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 = 'DES-EDE3'; |
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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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* @note For the current algorithm: 192 bits (24 bytes), but 168 bits (21 bytes) are usable |
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*/ |
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const KEY_SIZE = 24; |
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/** |
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* The internal initialization vector (IV) size measured in raw bytes length for the algorithm |
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* |
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* @note For the current algorithm: 64 bits (8 bytes) |
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*/ |
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const IV_SIZE = 8; |
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/** |
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* The internal operational block size measured in raw bytes length for the algorithm |
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* |
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* @note For the current algorithm: 64 bits (8 bytes) |
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*/ |
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const BLOCK_SIZE = 8; |
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/** |
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* List of valid block operation modes. |
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* |
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* @var array Block mode codes. |
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*/ |
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protected static $validBlockModes = [ |
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self::CBC_MODE, |
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self::CFB_MODE, |
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self::OFB_MODE, |
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self::ECB_MODE |
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]; |
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/** |
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* Fetch the correctly formatted internal encryption algorithm method name for the ECB naming bug at OpenSSL. |
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* |
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* @return string The ECB compatible name for the currently complied OpenSSL library (inside PHP build). |
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*/ |
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private function calculateEcbModeCompatibleOpenSslName() |
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{ |
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return in_array(strtolower(self::ALGORITHM_NAME), openssl_get_cipher_methods(), true) |
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? self::ALGORITHM_NAME : self::ALGORITHM_NAME . '-' . self::ECB_MODE; |
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} |
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/** |
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* Fetch the correctly formatted internal encryption algorithm method name. |
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* |
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* @return string The symmetric encryption algorithm standard. |
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*/ |
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protected function fetchAlgorithmMethodName() |
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{ |
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return ($this->mode === self::ECB_MODE) ? |
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$this->calculateEcbModeCompatibleOpenSslName() : static::ALGORITHM_NAME . '-' . $this->mode; |
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} |
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/** |
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* Internal method for the validation of the system support of the given block operation mode. |
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* |
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* @param string $mode The block mode name. |
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* |
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* @throws \Exception Validation errors. |
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* |
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* @codeCoverageIgnore |
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*/ |
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protected function validateBlockModeSupport($mode) |
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{ |
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$methodName = ($mode === self::ECB_MODE) ? |
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$this->calculateEcbModeCompatibleOpenSslName() : static::ALGORITHM_NAME . '-' . $mode; |
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if (!in_array(strtolower($methodName), openssl_get_cipher_methods(), true)) { |
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throw new \RuntimeException( |
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'The algorithm `' . $methodName . '`is not supported under the current system configuration.' |
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); |
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} |
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} |
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} |
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TonyKaravasilev /
CryptoManana
