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<?php |
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/** |
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* Trait implementation of file hashing for digestion algorithms. |
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*/ |
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namespace CryptoManana\Core\Traits\MessageDigestion; |
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use \CryptoManana\Core\Interfaces\MessageDigestion\FileHashingInterface as FileHashingSpecification; |
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use \CryptoManana\Core\Abstractions\MessageDigestion\AbstractHashAlgorithm as AnyDerivedHashAlgorithm; |
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use \CryptoManana\Core\StringBuilder as StringBuilder; |
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/** |
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* Trait FileHashingTrait - Reusable implementation of `FileHashingInterface`. |
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* |
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* @see \CryptoManana\Core\Interfaces\MessageDigestion\FileHashingInterface The abstract specification. |
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* |
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* @package CryptoManana\Core\Traits\MessageDigestion |
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* |
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* @mixin FileHashingSpecification |
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* @mixin AnyDerivedHashAlgorithm |
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*/ |
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trait FileHashingTrait |
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{ |
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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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$filename = StringBuilder::stringReplace("\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($filename)) { |
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throw new \RuntimeException('File is not found or can not be accessed.'); |
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} |
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} |
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/** |
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* Internal method for checking if native file hashing should be used by force. |
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* |
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* @return bool Is native hashing needed for the current salting mode. |
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*/ |
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protected function isFileSaltingForcingNativeHashing() |
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{ |
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return ( |
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( |
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// If there is an non-empty salt string set and salting is enabled |
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$this->salt !== '' && |
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$this->saltingMode !== self::SALTING_MODE_NONE |
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) || ( |
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// If there is an empty salt string set and the salting mode duplicates/manipulates the input |
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$this->salt === '' && |
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in_array($this->saltingMode, [self::SALTING_MODE_INFIX_SALT, self::SALTING_MODE_PALINDROME_MIRRORING]) |
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) |
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); |
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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 $filename The full path and name of the file for hashing. |
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* |
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* @return string The digest. |
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* @throws \Exception Validation errors. |
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*/ |
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abstract public function hashFile($filename); |
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} |
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TonyKaravasilev /
CryptoManana
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