Package com.hierynomus.sshj.transport.cipher

Class GcmCipher

java.lang.Object

net.schmizz.sshj.transport.cipher.BaseCipher

com.hierynomus.sshj.transport.cipher.GcmCipher

All Implemented Interfaces:

Cipher

public class GcmCipher
extends BaseCipher

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	GcmCipher.CounterGCMParameterSpec	Algorithm parameters for AES/GCM that assumes the IV uses an 8-byte counter field as its most significant bytes.

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

Cipher.Mode

Field Summary

Fields

Modifier and Type	Field	Description
protected int	authSize
protected boolean	initialized
protected Cipher.Mode	mode
protected GcmCipher.CounterGCMParameterSpec	parameters
protected SecretKey	secretKey

Fields inherited from class net.schmizz.sshj.transport.cipher.BaseCipher

cipher

Constructor Summary

Constructors

Constructor	Description
GcmCipher(int ivsize, int authSize, int bsize, String algorithm, String transformation)

Method Summary

Modifier and Type	Method	Description
int	getAuthenticationTagSize()
protected Cipher	getInitializedCipherInstance()
protected void	initCipher(Cipher cipher, Cipher.Mode mode, byte[] key, byte[] iv)
void	update(byte[] input, int inputOffset, int inputLen)	Performs in-place encryption or decryption on the given data.
void	updateAAD(byte[] data, int offset, int length)	Adds the provided input data as additional authenticated data during encryption or decryption.

Methods inherited from class net.schmizz.sshj.transport.cipher.BaseCipher

getBlockSize, getIVSize, getKeySpec, getMode, init, setSequenceNumber, updateAAD, updateWithAAD

Methods inherited from class java.lang.Object

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

Field Details

authSize

protected int authSize

mode

protected Cipher.Mode mode

initialized

protected boolean initialized

parameters

protected GcmCipher.CounterGCMParameterSpec parameters

secretKey

protected SecretKey secretKey

Constructor Details

GcmCipher

public GcmCipher(int ivsize,
 int authSize,
 int bsize,
 String algorithm,
 String transformation)

Method Details

getAuthenticationTagSize

public int getAuthenticationTagSize()

Specified by:

getAuthenticationTagSize in interface Cipher

Overrides:

getAuthenticationTagSize in class BaseCipher

Returns:

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

getInitializedCipherInstance

protected Cipher getInitializedCipherInstance()
                                       throws GeneralSecurityException

Throws:

GeneralSecurityException

initCipher

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

Specified by:

initCipher in class BaseCipher

Throws:

InvalidKeyException

InvalidAlgorithmParameterException

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

Overrides:

updateAAD in class BaseCipher

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

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

Overrides:

update in class BaseCipher

Parameters:

input - the subject

inputOffset - offset at which to start

inputLen - number of bytes starting at inputOffset