Package com.sshtools.common.ssh.components.jce

Class AbstractJCECipher

java.lang.Object

com.sshtools.common.ssh.components.AbstractSshCipher

com.sshtools.common.ssh.components.jce.AbstractJCECipher

All Implemented Interfaces:

Component, SshCipher, SshComponent, SecureComponent

Direct Known Subclasses:

AES128Cbc, AES128Ctr, AES128Gcm, AES192Cbc, AES192Ctr, AES256Cbc, AES256Ctr, AES256Gcm, ArcFour, ArcFour128, ArcFour256, BlowfishCbc, TripleDesCbc, TripleDesCtr

public class AbstractJCECipher
extends AbstractSshCipher

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 interface com.sshtools.common.ssh.components.SshCipher

DECRYPT_MODE, ENCRYPT_MODE

Constructor Summary

Constructors

Constructor	Description
AbstractJCECipher(String spec, String keyspec, int keylength, String algorithm, SecurityLevel securityLevel, int priority)

Method Summary

Modifier and Type	Method	Description
protected Cipher	createCipher(String spec)
int	getBlockSize()	Get the cipher block size.
int	getKeyLength()	Return the key length required
String	getProvider()
String	getProviderName()
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.common.ssh.components.AbstractSshCipher

getAlgorithm, getMacLength, getPriority, getSecurityLevel, isMAC, transform

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractJCECipher

public AbstractJCECipher(String spec,
 String keyspec,
 int keylength,
 String algorithm,
 SecurityLevel securityLevel,
 int priority)
                  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 Details

getProviderName

public String getProviderName()

Specified by:

getProviderName in interface SshCipher

Specified by:

getProviderName in class AbstractSshCipher

createCipher

protected Cipher createCipher(String spec)
                       throws NoSuchAlgorithmException,
NoSuchPaddingException

Throws:

NoSuchAlgorithmException

NoSuchPaddingException

transform

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

Description copied from class: AbstractSshCipher

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 interface SshCipher

Specified by:

transform in class AbstractSshCipher

Throws:

IOException

getProvider

public String getProvider()

getKeyLength

public int getKeyLength()

Description copied from class: AbstractSshCipher

Return the key length required

Specified by:

getKeyLength in interface SshCipher

Specified by:

getKeyLength in class AbstractSshCipher

Returns:

init

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

Description copied from class: AbstractSshCipher

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 interface SshCipher

Specified by:

init in class AbstractSshCipher

Parameters:

mode - the mode to operate

iv - the initiaization vector

keydata - the key data

Throws:

IOException

getBlockSize

public int getBlockSize()

Description copied from class: AbstractSshCipher

Get the cipher block size.

Specified by:

getBlockSize in interface SshCipher

Specified by:

getBlockSize in class AbstractSshCipher

Returns:

the block size in bytes.