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gnu.javax.crypto.pad
Class TLS1  view TLS1 download TLS1.java

java.lang.Object
  extended bygnu.javax.crypto.pad.BasePad
      extended bygnu.javax.crypto.pad.TLS1
All Implemented Interfaces:
IPad

public class TLS1
extends BasePad

The padding scheme used by the Transport Layer Security protocol, version 1. This padding scheme is used in the block-ciphered struct, e.g.:

 block-ciphered struct {
   opaque content[TLSCompressed.length];
   opaque MAC[CipherSpec.hash_size];
   uint8 padding[GenericBlockCipher.padding_length];
   uint8 padding_length;
 } GenericBlockCipher;
 

Where padding_length is any multiple of cipher_block_size - ((SSLCompressed.length + CipherSpec.hash_size) % cipher_block_size) - 1 that is less than 255. Every byte of the padding must be equal to padding_length. That is, the end of the plaintext is n + 1 copies of the unsigned byte n.


Field Summary
 
Fields inherited from class gnu.javax.crypto.pad.BasePad
blockSize, name
 
Constructor Summary
TLS1()
           
 
Method Summary
 byte[] pad(byte[] in, int off, int len)
          Returns the byte sequence that should be appended to the designated input.
 void setup()
          If any additional checks or resource setup must be done by the subclass, then this is the hook for it.
 int unpad(byte[] in, int off, int len)
          Returns the number of bytes to discard from a designated input buffer.
 
Methods inherited from class gnu.javax.crypto.pad.BasePad
init, name, reset, selfTest
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TLS1

public TLS1()
Method Detail

setup

public void setup()
Description copied from class: BasePad

If any additional checks or resource setup must be done by the subclass, then this is the hook for it. This method will be called before the BasePad.init(int) 55 method returns.

Specified by:
setup in class BasePad

pad

public byte[] pad(byte[] in,
                  int off,
                  int len)
Description copied from interface: IPad
Returns the byte sequence that should be appended to the designated input.

Specified by:
pad in interface IPad
Specified by:
pad in class BasePad

unpad

public int unpad(byte[] in,
                 int off,
                 int len)
          throws WrongPaddingException
Description copied from interface: IPad
Returns the number of bytes to discard from a designated input buffer.

Specified by:
unpad in interface IPad
Specified by:
unpad in class BasePad