Java AES without padding

Question

What are some of the simplest ways to AES encrypt and decrypt a 16 byte array without the automatic padding? I have found solutions that use external libraries, but I want to avoid that if possible.

My current code is

SecretKeySpec skeySpec = new SecretKeySpec(getCryptoKeyByteArray(length=16)); // 128 bits
Cipher encryptor = Cipher.getInstance("AES");
encryptor.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = encryptor.doFinal(plain);

How can I prevent the padding? The plain data is always fixed length and includes its own padding. How can I allow plain to be 16 bytes without causing encrypted to become 32 bytes?

Answer 1

See my comment. Sorry I probably should have taken a closer look the first time.

1. Change "AES" to "AES/CBC/NoPadding"
2. Change decryptor.init(Cipher.DECRYPT_MODE, skeySpec); to decryptor.init(Cipher.DECRYPT_MODE, skeySpec, encryptor.gerParameters());