gnu.javax.crypto.pad
Class TLS1
- IPad
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.
TLS1()- The basic constructor.
|
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.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
TLS1
public TLS1()
The basic constructor. Object is special, because it has no
superclass, so there is no call to super().
pad
public byte[] pad(byte[] in,
int off,
int len) Returns the byte sequence that should be appended to the designated input.
- pad in interface IPad
- pad in interface BasePad
in - the input buffer containing the bytes to pad.
- the possibly 0-byte long sequence to be appended to the designated
input.
setup
public void setup()
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) method returns.
- setup in interface BasePad
unpad
public int unpad(byte[] in,
int off,
int len)
throws WrongPaddingException Returns the number of bytes to discard from a designated input buffer.
- unpad in interface IPad
- unpad in interface BasePad
in - the input buffer containing the bytes to unpad.
- the number of bytes to discard, to the left of index position
offset + length in in. In other words, if
the return value of a successful invocation of this method is
result, then the unpadded byte sequence will be
offset + length - result bytes in in,
starting from index position offset.
TLS1.java -- TLSv1 padding scheme.
Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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