How to encrypt and decrypt string/object in nodejs - node.js

Question

I would like to encrypt an object then decrypt it. The encryption works very well but the decryption fails. Below my code :
crypto_ext.js
const crypto = require("crypto")
const password = "shared_key"
const algorithm = "aes256"
export const encrypt = (text) => {
if(!text) return ''
const cipher = crypto.createCipher(algorithm, password);
let crypted = cipher.update(text, 'utf-8', 'base64');
crypted += cipher.final('base64');
return crypted;
}
export const decrypt = (text) => {
if(!text) return ''
const decipher = crypto.createDecipher(algorithm, password);
let decrypted = decipher.update(text, 'base64', 'utf-8');
decrypted += decipher.final('utf-8');
return decrypted;
}
and in my test.js, I have :
import {encrypt, decrypt} from './crypto_ext.js'
let test = {key1: val1, key2: val2}
test = encrypt(JSON.stringify(test)) || test
console.log("Encrypt : ", test)
console.log("Decrypt : ", decrypt(test)) // I should have my object as string here
And this is what I'm getting as error :
Uncaught Error: unable to decrypt data
at unpad (decrypter.js:83)
at Decipher.webpackJsonp../node_modules/browserify-aes/decrypter.js.Decipher._final (decrypter.js:38)
at Decipher.webpackJsonp../node_modules/cipher-base/index.js.CipherBase._finalOrDigest (index.js:76)
at decrypt (crypto_ext.js:17)
...
Can you please tell me what I'm doing wrong ?

Answer 1

Method createCipher deprecated. Use createCipheriv instead.
Try to use aes192 algorithm.

Answer 2

Dependencies: crypto package
You can achieve encoding and decoding with below codes:-
const crypto = require('crypto');
var password = 'ojisdasjdsjabdjs';
var iv = 'kiamdksndn';
function sha1(input) {
return crypto.createHash('sha1').update(input).digest();
}
function password_derive_bytes(password, salt, iterations, len) {
var key = Buffer.from(password + salt);
for (var i = 0; i < iterations; i++) {
key = sha1(key);
}
if (key.length < len) {
var hx = password_derive_bytes(password, salt, iterations - 1, 20);
for (var counter = 1; key.length < len; ++counter) {
key = Buffer.concat([key, sha1(Buffer.concat([Buffer.from(counter.toString()), hx]))]);
}
}
return Buffer.alloc(len, key);
}
async function encode(string) {
var key = password_derive_bytes(password, '', 100, 32);
var cipher = crypto.createCipheriv('aes-256-cbc', key, Buffer.from(iv));
var part1 = cipher.update(string, 'utf8');
var part2 = cipher.final();
const encrypted = Buffer.concat([part1, part2]).toString('base64');
return encrypted;
}
async function decode(string) {
var key = password_derive_bytes(password, '', 100, 32);
var decipher = crypto.createDecipheriv('aes-256-cbc', key, Buffer.from(iv));
var decrypted = decipher.update(string, 'base64', 'utf8');
decrypted += decipher.final();
return decrypted;
}
And then call below functions for encode and decode
For encode
await encode(JSON.stringify({'title': 'some text'}));
For decode
await decode('encoded_string_to_decode');

Answer 3

Try to use 'bcrypt' package it will help you in the encryption for passwords.
If you want to encryption for Data. Then use crypto or node-rsa
Link npm bcrypt package
Node-RSA