Trying to add data in unsupported state at Cipher.update

Question

Below code is working

var crypto = require(\'crypto\');
var cipher = crypto.createCipher(\'aes-128-cbc\',\'abcdefghijklmnop\')
var http = require(\'http\')

         


        

Answer 1

Turns out

var cipher = crypto.createCipher('aes-128-cbc','abcdefghijklmnop')

should not be reused. I put it into the server callback too and the problem is solved.

Answer 2

Check this out

Thats mainly because every time we run the encrypt or decrypt we should repeat crypto.createCipher('aes192', secrateKey); and crypto.createDecipher('aes192', secrateKey);

let secrateKey = "secrateKey";
const crypto = require('crypto');


function encrypt(text) {
    encryptalgo = crypto.createCipher('aes192', secrateKey);
    let encrypted = encryptalgo.update(text, 'utf8', 'hex');
    encrypted += encryptalgo.final('hex');
    return encrypted;
}

function decrypt(encrypted) {
    decryptalgo = crypto.createDecipher('aes192', secrateKey);
    let decrypted = decryptalgo.update(encrypted, 'hex', 'utf8');
    decrypted += decryptalgo.final('utf8');
    return decrypted;
}

let encryptedText = encrypt("hello");
console.log(encryptedText);

let decryptedText = decrypt(encryptedText);
console.log(decryptedText);

Hope this helps!