CODEWITHSUNDEEP
node.jsencryption
Fady Fadlallah
Fady Fadlallah

Reputation: 69

Rfc2898DeriveBytes to crypto.pbkdf2

I am not getting the same results when switching from C# to JS:

Converting from this:

Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(
passPhrase,
Encoding.UTF8.GetBytes(saltValue)
);
MemoryStream ms = new MemoryStream();
Aes aes = new AesManaged();
aes.Key = pdb.GetBytes(aes.KeySize / 8);
aes.IV = pdb.GetBytes(aes.BlockSize / 8);
CryptoStream cs = new CryptoStream(ms,
aes.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(input, 0, input.Length);
cs.Close();
ms.Close();
aes.Clear();
return ms.ToArray();

To this:

crypto.pbkdf2(Buffer.from(pass), Buffer.from(salt, 'hex'), 1000, 256 / 8, null, function (err, key) {
   console.log("Key:" + key);
   crypto.pbkdf2(Buffer.from(pass), Buffer.from(salt, 'hex'), 1000, 128 / 8, null, function (err, key) {
        console.log("VID:" + key);
   }
}

But it's not working for some reason

I tried Buffer.from(pass, 'utf8') and so one but I am never getting the same result.

I know I have something wrong but I have no idea how pbkdf2 works

Upvotes: 2

Views: 1039

Answers (1)

Fady Fadlallah
Fady Fadlallah

Reputation: 69

For anyone in the same problem as I am this is the equivalent code

var pass = 'password';
var salt = 'salt';
var keyLen = keylen; // aes.KeySize / 8 where KeySize is 256
var IVLen = ivlen; // aes.BlockSize / 8 where BlockSize is 128

var nodeCrypto = crypto.pbkdf2Sync(pass, salt, 1000, keyLen + IVLen, 'sha1');

// Output same values as C# Bytes
var aesKey = [], aesIV = [];

for (var i = 0; i < nodeCrypto.length; i++) {
    if (i < keyLen)
        aesKey[i] = nodeCrypto[i];
    else
        aesIV[i - keyLen] = nodeCrypto[i];
}

console.log(aesKey);
console.log(aesIV);

// How to use it to decrypt
var r = fs.createReadStream(path);
var decrypt = crypto.createDecipheriv('aes-256-cbc', nodeCrypto.slice(0, keyLen), nodeCrypto.slice(keyLen, keyLen + IVLen));
var w = fs.createWriteStream(output);
r.pipe(decrypt).pipe(w);

Upvotes: 2

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