How can I disable padding?

[UnsignedInt8]

I want to disable data padding, and I passed nil to padding, but no effect. Please tell me how to disable data padding, thank you.

[krzyzanowskim]

use nil with code from branch 'develop'

[UnsignedInt8]

Thank you, I'm going to try it

[UnsignedInt8]

Hi, by using develop branch to disable data padding, it works. But the encrypted data can't be decrypted by Node.js.

The first two bytes can be decrypted, but the last encrypted data can't be decrypted.

let (cipher, iv) = Crypto.createCipher(self.cipherAlgorithm, password: self.password)

let meta: [UInt8] = [0x05, UInt8(drand48() * 0xff)]
let randomBytes = AES.randomIV(Int(meta[1]))

var bytes = [UInt8](count: data.length, repeatedValue: 0)
data.getBytes(&bytes) // Read data from socket

let encrypted = NSMutableData()
encrypted.appendData(NSData(bytes: iv)) // IV, no encrypted
encrypted.appendData(NSData(bytes: try! cipher.encrypt(meta, padding: nil)))  // Ok, can be decrypted by Node.js
encrypted.appendData(NSData(bytes: randomBytes)) // Random Padding Bytes, no encrypted

// The data can't be decrypted by Node.js
>> encrypted.appendData(NSData(bytes: try! cipher.encrypt(bytes, padding: nil)))  // Error, can't be decrypted by Node.js

proxy.writeData(encrypted, withTimeout: -1, tag: 0)

Here is protocol:

------------------Request---------------------

+------+------+------+----------+------------+
| IV   | TYPE | PLEN | RPADDING | SOCKETDATA |
+------+------+------+----------+------------+
| 8-16 | 1    | 1    | 0-255    | VARIABLE   |
+------+------+------+----------+------------+
| RAW  | ENCRYPTED   | RAW      | ENCRYPTED  |
+------+-------------+----------+------------+

Is my code writing wrong?

[dickwu]

not padding :
let jiares = try! jia.encrypt(byte!)

[UnsignedInt8]

@dickwu The problem is: the encrypted data can't be decrypted by Node.js. The first two bytes can be decrypted, but the last data CAN'T be decrypted.

[dickwu]

http://8gwifi.org/CipherFunctions.jsp
use this website to debug

[UnsignedInt8]

I tested my code, but I don't know where wrong:

IV from client

Server received IV

No problem with IV.

---

Sent encrypted data from client

Server received data

No problem with encrypted data

---

Server decrypted data

Client decrypted data

The decrypted data not same, why? But the first two can be decrypted by server! Cipher algorithm and cipher key are same.

First two bytes sent from client:

First two bytes decrypted by server:

[dickwu]

if you have qq please add my qq :"374026384"

[UnsignedInt8]

I used CFB block-mode.

[dickwu]

I need the iv func to debug

[UnsignedInt8]

IV function ?

I just use AES.randomIV(16) to generate IV.

@dickwu I don't use QQ, can we use email to communicate?

[dickwu]

ok my email is [email protected]

[dickwu]

[UnsignedInt8]

@krzyzanowskim Hi, author. Do you know why Node.js can't decrypt it?

[krzyzanowskim]

@SunshinyNeko I see a lot of problem how you use Node and CryptoSwift and convert types. From what I see you encrypt encrypt invalid data with this code.

[UnsignedInt8]

Encrypt invalid data? Could you tell me how to do it rightly?

[UnsignedInt8]

@krzyzanowskim I know where wrong, thank you, you are right. :)