Hashing Script

hash.php

<?php
	echo PHP_EOL;

	// Command information, used by showHelp().
	$commands = [
		'-h' => 'Display this list of parameters.',
		'-l' => 'List available hashing methods.',
		'-m' => 'Select hashing method (Required).',
		'-f' => 'Treat input as a file path.',
		'-n' => 'Split input by line-end, hashing each line.',
		'-o' => 'File to dump output.'
	];

	// List available hashing methods, then terminate script.
	function listMethods() {
		echo 'Available hashing methods:' . PHP_EOL;
		foreach (hash_algos() as $method)
			echo "\t" . $method . PHP_EOL;

		die(PHP_EOL);
	}

	// Display script help, then terminate script.
	function showHelp() {
		global $commands;

		echo 'Usage: hash [parameters] input'. PHP_EOL;
		echo 'Available parameters:' . PHP_EOL . PHP_EOL;
		foreach ($commands as $command => $commandInfo)
			echo "\t" . $command . ' -- ' . $commandInfo . PHP_EOL;

		die(PHP_EOL);
	}

	// Get command-line options.
	$options = getopt('hlfm:no:', [], $out);

	// Check if -h is set, if so, show help and terminate.
	if (array_key_exists('h', $options))
		showHelp();

	// Check if -l is set, if so, list hashing methods and terminate.
	if (array_key_exists('l', $options))
		listMethods();

	// Check if the method was set via -m.
	$method = $options['m'];
	if ($method === null)
		showHelp(); // No method provided.

	$method = strtolower($method);
	if (!in_array($method, hash_algos())) {
		echo 'Invalid hashing method: "' . $method . '"' . PHP_EOL;
		listMethods(); // Invalid method provided.
	}

	echo 'Method: ' . $method . PHP_EOL;

	// Input
	$input = implode(' ', array_slice($argv, $out));
	if (array_key_exists('f', $options)) {
		if (!file_exists($input))
			die('Input file does not exist: ' . $input);

		if (!is_file($input))
			die('Input file is not a file: ' . $input);

		$data = file_get_contents($input);
		if ($data === false)
			die('Input file cannot be read: ' . $input);

		$input = $data;
	}

	$nodes = [];
	if (array_key_exists('n', $options)) // Split input by line-end.
		$nodes = preg_split ('/$\R?^/m', $input);
	else
		$nodes[] = $input; // Hash all input as one.

	$outputFile = $options['o'] ?? null;
	foreach ($nodes as $node) {
		$result = hash($method, $node);
		if ($outputFile === null) {
			echo 'Input: (' . strlen($node) . ') "' . $node . '"' . PHP_EOL;

			// Compute
			echo 'Result: (' . strlen($result) . ') "' . $result . '"' . PHP_EOL . PHP_EOL;
		} else {
			file_put_contents($outputFile, $result . "\n", FILE_APPEND);
		}
	}

	if ($outputFile !== null)
		echo 'Done!' . PHP_EOL . PHP_EOL;