Stronger Encryption and Decryption in Node.js

encryption.js

'use strict';

const crypto = require('crypto');

const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY; // Must be 256 bits (32 characters)
const IV_LENGTH = 16; // For AES, this is always 16

function encrypt(text) {
 let iv = crypto.randomBytes(IV_LENGTH);
 let cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(ENCRYPTION_KEY), iv);
 let encrypted = cipher.update(text);

 encrypted = Buffer.concat([encrypted, cipher.final()]);

 return iv.toString('hex') + ':' + encrypted.toString('hex');
}

function decrypt(text) {
 let textParts = text.split(':');
 let iv = Buffer.from(textParts.shift(), 'hex');
 let encryptedText = Buffer.from(textParts.join(':'), 'hex');
 let decipher = crypto.createDecipheriv('aes-256-cbc', Buffer.from(ENCRYPTION_KEY), iv);
 let decrypted = decipher.update(encryptedText);

 decrypted = Buffer.concat([decrypted, decipher.final()]);

 return decrypted.toString();
}

module.exports = { decrypt, encrypt };

@nouman0557 up higher in this Gist I pasted a link to my GitHub repo which is a browser version of secret encryption using the native API SubtleCrypto

@camsjams Thank you

Above code generating different password every time for same text, how can i validate password is correct when user login

@hariprakashnagar Encryption is not for password validation. It's for password storage, i.e. in a database. If you need to compare, you just pull the user record from the database by email or username, decrypt the password and check it against their input.

For some reasons my encryption key though its a 32 character string keeps getting rejected as a key with invalid key length

@vlucas

@hariprakashnagar Encryption is not for password validation. It's for password storage, i.e. in a database. If you need to compare, you just pull the user record from the database by email or username, decrypt the password and check it against their input.

Never do this, passwords must be stored hashed (not reversible). They are verified by verifying the stored hash against the new hash generated from user input.

1 char=8 bits; so 256 bits equal 32 chars

@neeraj87 your above code really helped me but i am getting an error like this

Error: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt
at Decipheriv.final (crypto.js:183:26)
at decryption (/Users/pankajpbaviskar/Desktop/Vishwajeet/Teams/twentyfirstsuperadmin/server/middleware/crypto.js:36:42)

below is my code to decrypt
let textParts = res.locals[0][key].split(':');
let iv = new Buffer.from(textParts[0], 'hex');
let encryptedText = new Buffer.from(textParts[1], 'hex');
let decipher = crypto.createDecipheriv('aes-256-cbc', new Buffer.from(KEY), iv);
let decrypted = decipher.update(encryptedText);
console.log(decrypted, 'first');
decrypted = Buffer.concat([decrypted, decipher.final('utf8')]);
console.log(decrypted.toString());
I think i am getting error for decipher.final() but don't know how to fix it.

Hi great gist! I'm getting two errors -

1st: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt error if I don't set the decipher to decipher.setAutoPadding(false).

2nd: If I do set it to fix the padding to false .. The decrypted text returned is along the lines of: �ㆠT��2ν��үf$}�b����� y\���Ɇ�2�Rd��_�q �o���֥�"�5T�.... Which of course is false when comparing original text before encryption to decrypted text.

Any ideas?? Why this is decrypting this way?

�ㆠT��2ν��үf$}�b����� y\���Ɇ�2�Rd��_�q �o���֥�"�5T� ��1�J���/���W5���e)�m�V�o�ג!��VVl�E��ϰ/@���ܴ^\��}�Z�Ű2C���v�T �Y��[wx'��6Yw�%���R�^Sǧh+42�Km�#�t����et���C-(� . �B��D�!_���e�0,�-fzO�Z*�ym:h��\d4����b��F�/� �d�����s �%p&l@l�[ǎ���%u��Nڴ�e��u���_�-�_�C�����~��m,���<�(��A�r�6 �a��g@ �,�5Ik��d�������.I�� ������|9 ��N{��B�sW�(�Q���MKAE��_T�H��nR}!�g� �rA�������,J��|�:�c?*�d�b��WJ6��N!S�'��-l

@music2code Any luck on your problem? I am in same situation.

Thanks @vlucas - If anyone having trouble using code, I did the following.

npm install crypto

Get your 32 character passkey, you can type it yourself or go here and generate it > make sure you change Password length to 32 https://passwordsgenerator.net/

Copy paste that 32 character string into your .env file

In your .env file, put

ENCRYPTION_KEY = 'paste your 32 character string here'

Now Cut and paste all code from above into a js file eg file.js

In the file you want to use the encrypt and decrypt, use import the code like as follows

const { decrypt, encrypt } = require('./file') // path to your code that was cut and paste

and to use it test it out

let data = encrypt('hello')
console.log(data) // you will see the encrypted string
let dataD = decrypt(data)
console.log(dataD) // you will see the decrypted string 'hello'

Link Updated Password Generator: http://passwordsgenerators.net/

The password generator that you included doesn't load anymore. You can try this one.
https://passwords-generator.org

I am unable to run the code.....whenever I am entering the string.....it gives me an error...

made this package a while ago for server side encrypted payloads to use for backend only: https://www.npmjs.com/package/encryption.js