Source code for stringhash.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

namespace StringHash

{

	class StringHash

	{

		static readonly string progver = "1.01";

		static int Main( string[] args )

		{

			string hash = string.Empty;

			string str = string.Empty;

			#region Command Line Parsing

			if ( args.Contains( "/?" ) )

			{

				return ShowHelp( );

			}

			List<string> arguments = new List<string>( args );

			if ( Console.IsInputRedirected )

			{

				arguments.Insert( 0, "/S:" + Console.In.ReadToEnd( ) );

			}

			if ( arguments.Count != 2 )

			{

				return ShowHelp( "Missing or invalid command line arguments" );

			}

			foreach ( string arg in arguments )

			{

				switch ( arg.Substring( 0, 3 ).ToUpper( ) )

				{

					case "/A:":

						if ( !string.IsNullOrWhiteSpace( hash ) )

						{

							return ShowHelp( "Duplicate hash algorithm specification" );

						}

						hash = arg.Substring( 3 ).ToUpper( );

						if ( string.IsNullOrWhiteSpace( hash ) )

						{

							return ShowHelp( "Missing hash specification" );

						}

						break;

					case "/S:":

						if ( !string.IsNullOrWhiteSpace( str ) )

						{

							return ShowHelp( "Duplicate string specification" );

						}

						str = arg.Substring( 3 );

						if ( string.IsNullOrWhiteSpace( str ) )

						{

							return ShowHelp( "Empty string" );

						}

						break;

					default:

						return ShowHelp( "Invalid command line argument \"{0}\"", arg );

				}

			}

			#endregion Command Line Parsing

			HashAlgorithm hashalgorithm;

			switch ( hash )

			{

				case "MD5":

					hashalgorithm = new MD5CryptoServiceProvider( );

					break;

				case "SHA1":

				case "SHA-1":

					hashalgorithm = new SHA1CryptoServiceProvider( );

					break;

				case "SHA256":

				case "SHA-256":

					hashalgorithm = new SHA256CryptoServiceProvider( );

					break;

				case "SHA384":

				case "SHA-384":

					hashalgorithm = new SHA384CryptoServiceProvider( );

					break;

				case "SHA512":

				case "SHA-512":

					hashalgorithm = new SHA512CryptoServiceProvider( );

					break;

				default:

					return ShowHelp( "Invalid hash type \"{0}\"", hash );

			}

			string result = BitConverter.ToString( hashalgorithm.ComputeHash( StrToByteArray( str ) ) );

			hashalgorithm.Clear( );

			StringBuilder sb = new StringBuilder( result.ToLowerInvariant( ) );

			Console.WriteLine( sb.Replace( "-", "" ) );

			return 0;

		}

		// C# to convert a string to a byte array

		// http://www.chilkatsoft.com/faq/dotnetstrtobytes.html

		public static byte[] StrToByteArray( string instring )

		{

			ASCIIEncoding encoding = new ASCIIEncoding( );

			return encoding.GetBytes( instring );

		}

		public static int ShowHelp( params string[] errmsg )

		{

			#region Error Message

			if ( errmsg.Length > 0 )

			{

				List<string> errargs = new List<string>( errmsg );

				errargs.RemoveAt( 0 );

				Console.Error.WriteLine( );

				Console.ForegroundColor = ConsoleColor.Red;

				Console.Error.Write( "ERROR:\t" );

				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

				Console.ResetColor( );

			}

			#endregion Error Message

			/*			

			StringHash.exe,  Version 1.01

			Get the MD5 or SHA* hash value for the specified string

			Usage:  STRINGHASH.EXE  /A:hashAlgorithm  /S:"string"

			   or:  some_command  |  STRINGHASH.EXE  /A:hashAlgorithm

			Where:  hashAlgorithm  is either MD5, SHA1, SHA256, SHA384 or SHA512

					string         must be enclosed in doublequotes if it contains

			                       spaces or special characters

			        some_command   console program whose output serves as the string

			Note:   Return code ("ErrorLevel") -1 in case of errors, otherwise 0.

			Written by Rob van der Woude

			http://www.robvanderwoude.com

			*/

			#region Display Help Text

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "StringHash.exe,  Version {0}", progver );

			Console.Error.WriteLine( "Get the MD5 or SHA* hash value for the specified string" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Usage:  STRINGHASH.EXE  /A:hashAlgorithm  /S:\"string\"" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "   or:  some_command  |  STRINGHASH.EXE  /A:hashAlgorithm" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Where:  hashAlgorithm  is either MD5, SHA1, SHA256, SHA384 or SHA512" );

			Console.Error.WriteLine( "        string         must be enclosed in doublequotes if it contains" );

			Console.Error.WriteLine( "                       spaces or special characters" );

			Console.Error.WriteLine( "        some_command   console program whose output serves as the string" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Note:   Return code (\"ErrorLevel\") -1 in case of errors, otherwise 0." );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Written by Rob van der Woude" );

			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

			#endregion Display Help Text

			return -1;

		}

	}

}