using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

 public class multihash{

 public static void Main(String[] args)   {
	byte[] tohash = null;
	if(args.Length<1){
	  Console.WriteLine("\nUsage:    multihash   <filename|string-to-hash>") ;
	  return;
	 }
	String arg1 = args[0] ;

		
    //---------  If we have a file, get the binary data -------
	if(File.Exists(arg1)){
	 Console.WriteLine();
	 Console.WriteLine("Hashing file '{0}' ", arg1);
	 tohash = GetFileBytes(arg1);
	}
	else{
	 ASCIIEncoding ascii = new ASCIIEncoding();
	 tohash = ascii.GetBytes(arg1);
	 Console.WriteLine();
	 Console.WriteLine("Hashing string '{0}' ", arg1);
	}

	MD5 md5 = new MD5CryptoServiceProvider(); 
	byte[] md5hash = md5.ComputeHash(tohash);
	Console.WriteLine();
	Console.WriteLine("------------  MD5 hash: ------------");
	DisplayBytes(md5hash);
	Console.WriteLine();
	Console.WriteLine(Convert.ToBase64String(md5hash));

	SHA1 sha1 = new SHA1CryptoServiceProvider(); 
	byte[] sha1hash = sha1.ComputeHash(tohash);
	Console.WriteLine();
	Console.WriteLine("------------  SHA1 hash: ------------");
	DisplayBytes(sha1hash);
	Console.WriteLine();
	Console.WriteLine(Convert.ToBase64String(sha1hash));

	SHA256 sha256 = new SHA256Managed(); 
	byte[] sha256hash = sha256.ComputeHash(tohash);
	Console.WriteLine();
	Console.WriteLine("------------  SHA256 hash: ------------");
	DisplayBytes(sha256hash);
	Console.WriteLine();
	Console.WriteLine(Convert.ToBase64String(sha256hash));

	SHA512 sha512 = new SHA512Managed(); 
	byte[] sha512hash = sha512.ComputeHash(tohash);
	Console.WriteLine();
	Console.WriteLine("------------  SHA512 hash: ------------");
	DisplayBytes(sha512hash);
	Console.WriteLine();
	Console.WriteLine(Convert.ToBase64String(sha512hash));
 }

 private static byte[] GetFileBytes(String filename){
	if(!File.Exists(filename))
	 return null;
	Stream stream=new FileStream(filename,FileMode.Open);
	int datalen = (int)stream.Length;
	byte[] filebytes =new byte[datalen];
	stream.Seek(0,SeekOrigin.Begin);
	stream.Read(filebytes,0,datalen);
	stream.Close();
	return filebytes;
  }


 private static void DisplayBytes(byte[] data) 
  {
	for(int i=1; i<=data.Length; i++){	
	 Console.Write("{0:X2} ", data[i-1]) ;
	  if(i%16 == 0 && i != data.Length)
		Console.WriteLine("");
	}
   Console.WriteLine();
 }

}