Package org.bouncycastle.crypto.internal.wrappers

Class SP80038FWrapEngine

java.lang.Object

org.bouncycastle.crypto.internal.wrappers.SP80038FWrapEngine

All Implemented Interfaces:

Wrapper

public final class SP80038FWrapEngine
extends java.lang.Object

an implementation of the AES Key Wrapper from the NIST Key Wrap Specification as described in RFC 3394/SP800-38F.

For further details see: http://www.ietf.org/rfc/rfc3394.txt and http://csrc.nist.gov/encryption/kms/key-wrap.pdf.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	delta
protected BlockCipher	engine
protected boolean	forWrapping
protected byte[]	iv
protected static byte[]	ivKW
protected static byte[]	ivKWP
protected KeyParameter	param
protected boolean	wrapCipherMode

Constructor Summary

Constructors

Constructor	Description
SP80038FWrapEngine(BlockCipher engine, boolean useReverseDirection)	Create a RFC 3394 WrapEngine specifying the direction for wrapping and unwrapping..

Method Summary

Modifier and Type	Method	Description
java.lang.String	getAlgorithmName()	Return the name of the algorithm the wrapper implements.
void	init(boolean forWrapping, CipherParameters param)
protected void	invW(int n, byte[] block, byte[] a)
byte[]	unwrap(byte[] in, int inOff, int inLen)
protected byte[]	W(int n, byte[] block)
byte[]	wrap(byte[] in, int inOff, int inLen)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ivKW

protected static final byte[] ivKW

ivKWP

protected static final byte[] ivKWP

wrapCipherMode

protected final boolean wrapCipherMode

engine

protected final BlockCipher engine

delta

protected final int delta

iv

protected final byte[] iv

param

protected KeyParameter param

forWrapping

protected boolean forWrapping

Constructor Detail

SP80038FWrapEngine

public SP80038FWrapEngine(BlockCipher engine,
                          boolean useReverseDirection)

Create a RFC 3394 WrapEngine specifying the direction for wrapping and unwrapping..

Parameters:

engine - the block cipher to be used for wrapping.

useReverseDirection - true if engine should be used in decryption mode for wrapping, false otherwise.

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: Wrapper

Return the name of the algorithm the wrapper implements.

Returns:

the name of the algorithm the wrapper implements.

wrap

public byte[] wrap(byte[] in,
                   int inOff,
                   int inLen)

unwrap

public byte[] unwrap(byte[] in,
                     int inOff,
                     int inLen)
              throws InvalidCipherTextException

Throws:

InvalidCipherTextException

init

public void init(boolean forWrapping,
                 CipherParameters param)

Specified by:

init in interface Wrapper

W

protected byte[] W(int n,
                   byte[] block)

invW

protected void invW(int n,
                    byte[] block,
                    byte[] a)