com.sshtools.ssh.components.jce

Class AbstractJCECipher

java.lang.Object

com.sshtools.ssh.components.SshCipher

com.sshtools.ssh.components.jce.AbstractJCECipher

Direct Known Subclasses:

AES128Cbc, AES128Ctr, AES192Cbc, AES192Ctr, AES256Cbc, AES256Ctr, ArcFour, ArcFour128, ArcFour256, BlowfishCbc, TripleDesCbc, TripleDesCtr

public class AbstractJCECipher
extends SshCipher

An abstract base class for defining SSH ciphers which use a JCE provider instead of the internal Maverick Crypto provider.

Author:

Lee David Painter

Field Summary

Fields inherited from class com.sshtools.ssh.components.SshCipher

DECRYPT_MODE, ENCRYPT_MODE

Constructor Summary

Constructors

Constructor and Description
AbstractJCECipher(String spec, String keyspec, int keylength, String algorithm)

Method Summary

Methods

Modifier and Type	Method and Description
int	getBlockSize() Get the cipher block size.
String	getProvider()
void	init(int mode, byte[] iv, byte[] keydata) Initialize the cipher with up to 40 bytes of iv and key data.
void	transform(byte[] buf, int start, byte[] output, int off, int len) Transform the byte array according to the cipher mode; it is legal for the source and destination arrays to reference the same physical array so care should be taken in the transformation process to safeguard this rule.

Methods inherited from class com.sshtools.ssh.components.SshCipher

getAlgorithm, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractJCECipher

public AbstractJCECipher(String spec,
                 String keyspec,
                 int keylength,
                 String algorithm)
                  throws IOException

Parameters:

spec - the value passed into Cipher.getInstance() that specifies the specification of the cipher; for example "Blowfish/CBC/NoPadding"

keyspec - the value passed into the constructor of SecretKeySpec.

keylength - int the length in bytes of the key

Throws:

IOException

Method Detail

transform

public void transform(byte[] buf,
             int start,
             byte[] output,
             int off,
             int len)
               throws IOException

Description copied from class: SshCipher

Transform the byte array according to the cipher mode; it is legal for the source and destination arrays to reference the same physical array so care should be taken in the transformation process to safeguard this rule.

Specified by:

transform in class SshCipher

Throws:

IOException

getProvider

public String getProvider()

init

public void init(int mode,
        byte[] iv,
        byte[] keydata)
          throws IOException

Description copied from class: SshCipher

Initialize the cipher with up to 40 bytes of iv and key data. Each implementation should take as much data from the initialization as it needs ignoring any data that it does not require.

Specified by:

init in class SshCipher

Parameters:

mode - the mode to operate

iv - the initiaization vector

keydata - the key data

Throws:

IOException

getBlockSize

public int getBlockSize()

Description copied from class: SshCipher

Get the cipher block size.

Specified by:

getBlockSize in class SshCipher

Returns:

the block size in bytes.