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gnu.javax.crypto.pad
Class PKCS7  view PKCS7 download PKCS7.java

java.lang.Object
  extended bygnu.javax.crypto.pad.BasePad
      extended bygnu.javax.crypto.pad.PKCS7
All Implemented Interfaces:
IPad

public final class PKCS7
extends BasePad

The implementation of the PKCS7 padding algorithm.

This algorithm is described for 8-byte blocks in [RFC-1423] and extended to block sizes of up to 256 bytes in [PKCS-7].

References:
RFC-1423: Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and Identifiers.
IETF. [PKCS-7]PKCS #7: Cryptographic Message Syntax Standard - An RSA Laboratories Technical Note.
RSA Security.


Field Summary
private static boolean DEBUG
           
private static int debuglevel
           
private static java.io.PrintWriter err
           
private static java.lang.String NAME
           
 
Fields inherited from class gnu.javax.crypto.pad.BasePad
blockSize, name
 
Constructor Summary
(package private) PKCS7()
          Trivial package-private constructor for use by the Factory class.
 
Method Summary
private static void debug(java.lang.String s)
           
 byte[] pad(byte[] in, int offset, int length)
          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 offset, int length)
          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
 

Field Detail

NAME

private static final java.lang.String NAME
See Also:
Constant Field Values

DEBUG

private static final boolean DEBUG
See Also:
Constant Field Values

debuglevel

private static final int debuglevel
See Also:
Constant Field Values

err

private static final java.io.PrintWriter err
Constructor Detail

PKCS7

PKCS7()
Trivial package-private constructor for use by the Factory class.

Method Detail

debug

private static void debug(java.lang.String s)

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 offset,
                  int length)
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 offset,
                 int length)
          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