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gnu.javax.crypto.pad
Class PKCS7  

java.lang.Object
  gnu.javax.crypto.pad.BasePad
      gnu.javax.crypto.pad.PKCS7

All Implemented Interfaces:

IPad

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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.

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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

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DEBUG

private static final boolean DEBUG

See Also:

Constant Field Values

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debuglevel

private static final int debuglevel

See Also:

Constant Field Values

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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)

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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

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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

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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

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