Package net.schmizz.sshj.transport.cipher

Class BaseCipher

java.lang.Object

net.schmizz.sshj.transport.cipher.BaseCipher

All Implemented Interfaces:

Cipher

Direct Known Subclasses:

BlockCipher, ChachaPolyCipher, GcmCipher, StreamCipher

public abstract class BaseCipher
extends Object
implements Cipher

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

Nested Class Summary

Nested classes/interfaces inherited from interface net.schmizz.sshj.transport.cipher.Cipher

Cipher.Mode

Field Summary

Fields

Modifier and Type	Field	Description
private final String	algorithm
private final int	bsize
protected Cipher	cipher
private final int	ivsize
private final String	transformation

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
int	getAuthenticationTagSize()
int	getBlockSize()
int	getIVSize()
protected SecretKeySpec	getKeySpec(byte[] key)
protected int	getMode(Cipher.Mode mode)
void	init(Cipher.Mode mode, byte[] key, byte[] iv)	Initialize the cipher for encryption or decryption with the given private key and initialization vector
protected abstract void	initCipher(Cipher cipher, Cipher.Mode mode, byte[] key, byte[] iv)
private static byte[]	resize(byte[] data, int size)
void	setSequenceNumber(long seq)
void	update(byte[] input, int inputOffset, int inputLen)	Performs in-place encryption or decryption on the given data.
void	updateAAD(byte[] data)	Adds the provided input data as additional authenticated data during encryption or decryption.
void	updateAAD(byte[] data, int offset, int length)	Adds the provided input data as additional authenticated data during encryption or decryption.
void	updateWithAAD(byte[] input, int offset, int aadLen, int inputLen)	Performs in-place authenticated encryption or decryption with additional data (AEAD).

Methods inherited from class java.lang.Object

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

Field Details

ivsize

private final int ivsize

bsize

private final int bsize

algorithm

private final String algorithm

transformation

private final String transformation

cipher

protected Cipher cipher

Constructor Details

BaseCipher

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

Method Details

resize

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

getBlockSize

public int getBlockSize()

Specified by:

getBlockSize in interface Cipher

Returns:

the block size for this cipher

getIVSize

public int getIVSize()

Specified by:

getIVSize in interface Cipher

Returns:

the size of the initialization vector

getAuthenticationTagSize

public int getAuthenticationTagSize()

Specified by:

getAuthenticationTagSize in interface Cipher

Returns:

Size of the authentication tag (AT) in bytes or 0 if this cipher does not support authentication

init

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

Description copied from interface: Cipher

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

Specified by:

init in interface Cipher

Parameters:

mode - whether this instance wil encrypt or decrypt

key - the key for the cipher

iv - initialization vector

initCipher

protected abstract void initCipher(Cipher cipher,
 Cipher.Mode mode,
 byte[] key,
 byte[] iv)
                            throws InvalidKeyException,
InvalidAlgorithmParameterException

Throws:

InvalidKeyException

InvalidAlgorithmParameterException

getKeySpec

protected SecretKeySpec getKeySpec(byte[] key)

getMode

protected int getMode(Cipher.Mode mode)

update

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

Description copied from interface: Cipher

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

Specified by:

update in interface Cipher

Parameters:

input - the subject

inputOffset - offset at which to start

inputLen - number of bytes starting at inputOffset

updateAAD

public void updateAAD(byte[] data,
 int offset,
 int length)

Description copied from interface: Cipher

Adds the provided input data as additional authenticated data during encryption or decryption.

Specified by:

updateAAD in interface Cipher

Parameters:

data - The additional data to authenticate

offset - The offset of the additional data in the buffer

length - The number of bytes in the buffer to use for authentication

updateAAD

public void updateAAD(byte[] data)

Description copied from interface: Cipher

Adds the provided input data as additional authenticated data during encryption or decryption.

Specified by:

updateAAD in interface Cipher

Parameters:

data - The data to authenticate

updateWithAAD

public void updateWithAAD(byte[] input,
 int offset,
 int aadLen,
 int inputLen)

Description copied from interface: Cipher

Performs in-place authenticated encryption or decryption with additional data (AEAD). Authentication tags are implicitly appended after the output ciphertext or implicitly verified after the input ciphertext. Header data indicated by the aadLen parameter are authenticated but not encrypted/decrypted, while payload data indicated by the inputLen parameter are authenticated and encrypted/decrypted.

Specified by:

updateWithAAD in interface Cipher

Parameters:

input - The input/output bytes

offset - The offset of the data in the input buffer

aadLen - The number of bytes to use as additional authenticated data - starting at offset

inputLen - The number of bytes to update - starting at offset + aadLen

setSequenceNumber

public void setSequenceNumber(long seq)

Specified by:

setSequenceNumber in interface Cipher