gistfile1.txt

var filename = 'test.manifest'
var crypto = require('crypto');
var util = require('util');
var fs = require('fs');

var shasum = crypto.createHash('sha1');

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

s.on('end', function() {
  var d = shasum.digest('hex');
  util.log(d + ' ' + filename);
});