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<?php |
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/** |
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* Abstraction for unkeyed hash objects like checksums and plain cryptographic hash functions. |
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*/ |
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namespace CryptoManana\Core\Abstractions\MessageDigestion; |
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use \CryptoManana\Core\Abstractions\MessageDigestion\AbstractHashAlgorithm as HashAlgorithm; |
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use \CryptoManana\Core\Interfaces\MessageDigestion\ObjectHashingInterface as ObjectHashing; |
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use \CryptoManana\Core\Interfaces\MessageDigestion\FileHashingInterface as FileHashing; |
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/** |
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* Class AbstractUnkeyedHashFunction - Abstraction for unkeyed hash classes. |
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* |
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* @package CryptoManana\Core\Abstractions\MessageDigestion |
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*/ |
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abstract class AbstractUnkeyedHashFunction extends HashAlgorithm implements ObjectHashing, FileHashing |
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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 = 'none'; |
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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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* Internal method for location and filename validation. |
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* |
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* @param string $filename The filename and location. |
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* |
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* @throws \Exception Validation errors. |
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*/ |
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protected function validateFileNamePath($filename) |
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{ |
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// Validate input type |
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if (!is_string($filename)) { |
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throw new \InvalidArgumentException('The file path must be of type string.'); |
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} |
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$filename = str_replace("\0", '', $filename); // (ASCII 0 (0x00)) |
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$filename = realpath($filename); // Path traversal escape and absolute path fetching |
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// Clear path cache |
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if (!empty($filename)) { |
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clearstatcache(true, $filename); |
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} |
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// Check if path is valid and the file is readable |
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if ($filename === false || !file_exists($filename) || !is_readable($filename) || !is_file($filename)) { |
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throw new \RuntimeException('File is not found or can not be accessed.'); |
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} |
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} |
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/** |
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* Unkeyed hash 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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/** |
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* Calculates a hash value for the given data. |
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* |
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* @param string $data The input string. |
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* |
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* @return string The digest. |
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* @throws \Exception Validation errors. |
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*/ |
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public function hashData($data) |
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{ |
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if (!is_string($data)) { |
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throw new \InvalidArgumentException('The data for hashing must be a string or a binary string.'); |
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} |
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$data = $this->addSaltString($data); |
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$digest = hash(static::ALGORITHM_NAME, $data, ($this->digestFormat === self::DIGEST_OUTPUT_RAW)); |
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$digest = $this->changeOutputFormat($digest); |
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return $digest; |
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} |
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/** |
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* Calculates a hash value for the content of the given filename and location. |
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* |
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* @param string $filename The full path and name of the file for hashing. |
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* |
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* @return string The digest. |
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* @throws \Exception Validation errors. |
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*/ |
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public function hashFile($filename) |
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{ |
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$this->validateFileNamePath($filename); |
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if ($this->useNative) { |
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$data = file_get_contents($filename); |
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$oldSalt = $this->getSalt(); |
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$oldMode = $this->getSaltingMode(); |
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$this->setSalt('')->setSaltingMode(self::SALTING_MODE_NONE); |
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$digest = $this->hashData($data); |
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$this->setSalt($oldSalt)->setSaltingMode($oldMode); |
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} else { |
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$digest = hash_file(static::ALGORITHM_NAME, $filename, ($this->digestFormat === self::DIGEST_OUTPUT_RAW)); |
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$digest = $this->changeOutputFormat($digest); |
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} |
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return $digest; |
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} |
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/** |
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* Calculates a hash value for the serialized value of the given object. |
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* |
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* @param object|\stdClass $object The full path and name of the file for hashing. |
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* |
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* @return string The digest. |
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* @throws \Exception Validation errors. |
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*/ |
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public function hashObject($object) |
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{ |
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if (is_object($object)) { |
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$object = serialize($object); |
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} else { |
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throw new \InvalidArgumentException('The data for hashing must be an object instance.'); |
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} |
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return $this->hashData($object); |
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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' => 'unkeyed digestion or checksum', |
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'salt' => $this->salt, |
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'mode' => $this->saltingMode, |
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]; |
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} |
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} |
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TonyKaravasilev /
CryptoManana
