C# Command Line Script for hashing strings and files

Hash.csx

using System.Security.Cryptography;

var helpStr = @"
Hash Helper Tool!

Example Usage:
scriptcs Hash.csx -- SHA256 -s ""Example String""
scriptcs Hash.csx -- SHA384 -f ""path/to/file""
scriptcs Hash.csx -- SHA512 -i

Accepted Hash Algorithms: MD5, SHA1, SHA256, SHA384, SHA512.
";

try
{
	if (Env.ScriptArgs.Count == 0)
	{
		Console.WriteLine("Missing Arguments!");
		Console.WriteLine(helpStr);
		Environment.Exit(0);
	}

	var algo = Env.ScriptArgs[0];
	var mode = Env.ScriptArgs.Count == 1 ? "-i" : Env.ScriptArgs[1];
	var hash = new byte[0];

	var algoInst = HashAlgorithm.Create(algo);
	if (algoInst == null)
	{
		Console.WriteLine("Invalid Hash Algorithm: " + algo);
		Console.WriteLine(helpStr);
		Environment.Exit(0);
	}

	var trim = false;
	if (mode.Length == 3 && mode[2] == 't')
	{
		trim = true;
		mode = mode.Substring(0, 2);
	}

	string input = "";

	switch (mode)
	{
		case "-f":
			Console.WriteLine("Computing " + algo + " Hash for file: " + Env.ScriptArgs[2]);
			if (trim)
				hash = algoInst.ComputeHash(Encoding.UTF8.GetBytes(File.ReadAllText(Env.ScriptArgs[2]).Trim()));
			else
				hash = algoInst.ComputeHash(File.OpenRead(Env.ScriptArgs[2]));
			break;
		case "-s":
			Console.WriteLine("Computing " + algo + " Hash for string: " + Env.ScriptArgs[2]);
			input = Env.ScriptArgs[2];
			if (trim) input = input.Trim();
			hash = algoInst.ComputeHash(Encoding.UTF8.GetBytes(input));
			break;
		case "-i":
			Console.WriteLine("Computing " + algo + " Hash from standard input");
			input = Console.In.ReadToEnd();
			if (trim) input = input.Trim();
			hash = algoInst.ComputeHash(Encoding.UTF8.GetBytes(input));
			break;
		default:
			Console.WriteLine("Invalid Mode: " + mode);
			Console.WriteLine(helpStr);
			Environment.Exit(0);
			break;
	}

	var hexStr = BitConverter.ToString(hash).Replace("-", "");
	var b64Str = Convert.ToBase64String(hash);

	Console.ForegroundColor = ConsoleColor.Green;
	Console.Write("Hex: ");
	Console.ForegroundColor = ConsoleColor.Yellow;
	Console.WriteLine(hexStr);

	Console.ForegroundColor = ConsoleColor.Green;
	Console.Write("B64: ");
	Console.ForegroundColor = ConsoleColor.Yellow;
	Console.WriteLine(b64Str);

	Console.ResetColor();
}
catch (Exception ex)
{
	Console.WriteLine(ex);
	Console.WriteLine(helpStr);
}

/*
	To turn this into a command line tool, put the following in a hash.bat file anywhere in your PATH:
	
	@echo off
	scriptcs "path/to/Hash.csx" -- %*
	
	That way you can just type:
	hash SHA256 -s "Example String"
*/