org.apache.sshd.common.cipher

Class BaseCipher

java.lang.Object

org.apache.sshd.common.cipher.BaseCipher

All Implemented Interfaces:

Cipher, CipherInformation

Direct Known Subclasses:

BaseRC4Cipher

public class BaseCipher
extends Object
implements Cipher

Base class for all Cipher implementations delegating to the JCE provider.

Author:

Apache MINA SSHD Project

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.sshd.common.cipher.Cipher

Cipher.Mode

Field Summary

Fields

Modifier and Type	Field and Description
protected Cipher	cipher

Constructor Summary

Constructors

Constructor and Description
BaseCipher(int ivsize, int bsize, String algorithm, String transformation)

Method Summary

Modifier and Type	Method and Description
String	getAlgorithm()
int	getBlockSize()
int	getIVSize()
String	getTransformation()
void	init(Cipher.Mode mode, byte[] key, byte[] iv) Initialize the cipher for encryption or decryption with the given key and initialization vector
protected static byte[]	resize(byte[] data, int size)
String	toString()
void	update(byte[] input, int inputOffset, int inputLen) Performs in-place encryption or decryption on the given data.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.sshd.common.cipher.Cipher

checkSupported, update

Field Detail

cipher

protected Cipher cipher

Constructor Detail

BaseCipher

public BaseCipher(int ivsize,
                  int bsize,
                  String algorithm,
                  String transformation)

Method Detail

getAlgorithm

public String getAlgorithm()

Specified by:

getAlgorithm in interface CipherInformation

Returns:

The cipher's algorithm

getTransformation

public String getTransformation()

Specified by:

getTransformation in interface CipherInformation

Returns:

The actual transformation used - e.g., AES/CBC/NoPadding

getIVSize

public int getIVSize()

Specified by:

getIVSize in interface CipherInformation

Returns:

Size of the initialization vector (in bytes)

getBlockSize

public int getBlockSize()

Specified by:

getBlockSize in interface CipherInformation

Returns:

The block size (in bytes) for this cipher

init

public void init(Cipher.Mode mode,
                 byte[] key,
                 byte[] iv)
          throws Exception

Description copied from interface: Cipher

Initialize the cipher for encryption or decryption with the given key and initialization vector

Specified by:

init in interface Cipher

Parameters:

mode - Encrypt/Decrypt initialization

key - Key bytes

iv - Initialization vector bytes

Throws:

Exception - If failed to initialize

update

public void update(byte[] input,
                   int inputOffset,
                   int inputLen)
            throws Exception

Description copied from interface: Cipher

Performs in-place encryption or decryption on the given data.

Specified by:

update in interface Cipher

Parameters:

input - The input/output bytes

inputOffset - The offset of the data in the data buffer

inputLen - The number of bytes to update - starting at the given offset

Throws:

Exception - If failed to execute

resize

protected static byte[] resize(byte[] data,
                               int size)

toString

public String toString()

Overrides:

toString in class Object