How to reset the Cipher to the state at the time of initialization?

Question

To preserve the key, the iv, and the mode of operation and to reset all buffers and so on. doFinal() call is that correct? But doFinal () will do the extra work. And I do not need previous data.

Cipher с=Cipher.getInstance("AES/CBC/PKCS7Padding");
с.init(Cipher.DECRYPT_MODE, key, iv);
....

void Decode(Cipher c)
{
   c.doFinal();//reset cipher !?
   //Start a new decoding session
   ....
}

Answer 1

You call Cipher.init(), of course.

You just need to rearrange your API so that the correct parameters are provided to your methods so they can call init().

You will probably need a new initialization vector for each separate encrypt/decrypt anyway.