javascript md5sum (NodeJS)

var filename = process.argv[2];
var crypto = require('crypto');
var fs = require('fs');
var t=new Date();
var md5sum = crypto.createHash('md5');

var s = fs.ReadStream(filename);
s.on('data', function(d) {
  md5sum.update(d);
});

s.on('end', function() {
  var d = md5sum.digest('hex');
  // console.log(d + '  ' + filename);


  var dt=new Date()-t,fsize=fs.statSync(filename).size; //new Date().toLocaleTimeString(),
  console.log(d + '  ' + filename+'\t # '+dt+'ms '+(fsize/dt/1000).toFixed(1)+"MB/s\n");
});



/*
-md5
-md4
-md2
-sha1
-sha
-sha224
-sha256
-sha384
-sha512
-mdc2
-ripemd160
*/