zfael

To keep the changes from the commit you want to undo

$ git reset --soft HEAD^

To destroy the changes from the commit you want to undo

$ git reset --hard HEAD^

You can also say

zfael

//how to execute: node verify.js <path file that you want to verify> <certificate path> <hash generate by sign.js>
//output: true if files are equal, false otherwise.
var crypto = require('crypto');
var fs = require('fs');

var args = process.argv.slice(2);
var fileName = args[0];
var certPath = args[1];
var sig = args[2];

zfael

//how to execute: node sign.js <path file> <path private key>
//output: signature of file
var crypto = require('crypto');
var fs = require('fs');

var args = process.argv.slice(2);
var fileName = args[0];
var keyPath = args[1];

//openssl genrsa -out key.pem 1024

zfael

var fs = require('fs');
var crypto = require('crypto');

fs.readFile('file.pdf', function(err, data) {
  var checksum = generateChecksum(data);
  console.log(checksum);
});

function generateChecksum(str, algorithm, encoding) {
    return crypto