Implementing DES encryption in NodeJS (Crypto) - node.js

Question

I'm trying to convert the below java function for DES encryption into NodeJS.
public static String decrypt (String value) {
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(SALT, COUNT);
PBEKeySpec pbeKeySpec = new PBEKeySpec(KEY);
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(SECRET_KEY);
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
Cipher dcipher = Cipher.getInstance(SECRET_KEY);
dcipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(value);
byte[] utf8 = dcipher.doFinal(dec);
return new String(utf8, UTF8);
}
After some research, I was able to implement the below function in NodeJS.
function decrypt(input) {
const encrypted = Buffer.from(input, 'base64')
const key = crypto.pbkdf2Sync(SECRET_KEY, salt, ITERATION_COUNT, SECRET_KEY.length, 'md5');
const cipher = crypto.createDecipher('des-cbc', key);
const decrypted = Buffer.concat([cipher.update(encrypted, 'base64'), cipher.final()])
return decrypted.toString('utf-8');
}
When I try to decrypt an already encrypted string, I'm getting some garbage value. Also, I don't understand where should I add the KEY value in NodeJS as in java code.
Please help me to understand what I'm doing wrong here.
UPDATE
As mentioned by #Topaco in the comment, the name SECRET_KEY is misleading in the original java code. I found it as PBEWithMD5AndDES and was able to search with the same name and find a code snippet that solves my issue.
The code snippet is available as a gist: https://gist.github.com/qzaidi/5401800

Answer 1

As mentioned by #Topaco in the comment, the name SECRET_KEY is misleading in the original java code. I found it as PBEWithMD5AndDES and was able to search with the same name and find a code snippet that solves my issue.
The code snippet is available as a gist: https://gist.github.com/qzaidi/5401800
"use strict";
/*
* Emulates Java's PBEWITHMD5ANDDES for node.js
*/
var crypto = require('crypto');
var pbewithmd5anddes = {
KDF: function(password, salt, iterations) {
var pwd = new Buffer(password, 'utf-8');
var key = Buffer.concat([pwd, salt]);
var i;
for (i = 0; i < iterations; i += 1) {
key = crypto.createHash("md5").update(key).digest();
}
return key;
},
getKeyIV: function(password, salt, iterations) {
var key = this.KDF(password, salt, iterations);
var keybuf = new Buffer(key, 'binary').slice(0, 8);
var ivbuf = new Buffer(key, 'binary').slice(8, 16);
return [keybuf, ivbuf];
},
encrypt: function(payload, password, salt, iterations, cb) {
var kiv = this.getKeyIV(password, salt, iterations);
var cipher = crypto.createCipheriv('des', kiv[0], kiv[1]);
var encrypted = [];
encrypted.push(cipher.update(payload, 'utf-8', 'hex'));
encrypted.push(cipher.final('hex'));
return cb(undefined, new Buffer(encrypted.join(''), 'hex').toString('base64'));
},
decrypt: function(payload, password, salt, iterations, cb) {
var encryptedBuffer = new Buffer(payload, 'base64');
var kiv = this.getKeyIV(password, salt, iterations);
var decipher = crypto.createDecipheriv('des', kiv[0], kiv[1]);
var decrypted = [];
decrypted.push(decipher.update(encryptedBuffer));
decrypted.push(decipher.final());
return cb(undefined, decrypted.join(''));
}
};
module.exports = pbewithmd5anddes;
/* ---------------- TEST CODE ---------------- */
(function() {
if (require.main === module) {
var password = 'test';
var iterations = 19;
var salt = new Buffer('d99bce325735e303', 'hex');
pbewithmd5anddes.encrypt('helloworld', password, salt, iterations, function(err, msg) {
console.log('encrypted: ' + msg);
// eat your own dogfood
pbewithmd5anddes.decrypt(msg, password, salt, iterations, function(err, msg) {
console.log('decrypted: ' + msg);
});
});
}
}());