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

Class ChaCha20Poly1305.Poly1305

java.lang.Object

com.sshtools.common.ssh.components.jce.ChaCha20Poly1305.Poly1305

Enclosing class:

ChaCha20Poly1305

public static class ChaCha20Poly1305.Poly1305
extends Object

Poly1305 message authentication code, designed by D. J. Bernstein.

Poly1305 computes a 128-bit (16 bytes) authenticator, using a 128 bit nonce and a 256 bit key consisting of a 128 bit key applied to an underlying cipher, and a 128 bit key (with 106 effective key bits) used in the authenticator.

The polynomial calculation in this implementation is adapted from the public domain poly1305-donna-unrolled C implementation by Andrew M (@floodyberry).

See Also:

• Poly1305KeyGenerator

Constructor Summary

Constructors

Constructor	Description
Poly1305()	Constructs a Poly1305 MAC, where the key passed to init() will be used directly.

Method Summary

Modifier and Type	Method	Description
int	doFinal(byte[] out, int outOff)
String	getAlgorithmName()
int	getMacSize()
void	init(byte[] key)	Initialises the Poly1305 MAC.
void	reset()
void	update(byte in)
void	update(byte[] in, int inOff, int len)

Methods inherited from class java.lang.Object

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

Constructor Details

Poly1305

public Poly1305()

Constructs a Poly1305 MAC, where the key passed to init() will be used directly.

Method Details

init

public void init(byte[] key)
          throws IllegalArgumentException

Initialises the Poly1305 MAC.

Parameters:

params - if used with a block cipher, then a ParametersWithIV containing a 128 bit nonce and a KeyParameter with a 256 bit key complying to the Poly1305 key format, otherwise just the KeyParameter.

Throws:

IllegalArgumentException

getAlgorithmName

public String getAlgorithmName()

getMacSize

public int getMacSize()

update

public void update(byte in)
            throws IOException,
IllegalStateException

Throws:

IOException

IllegalStateException

update

public void update(byte[] in,
 int inOff,
 int len)
            throws IOException,
IllegalStateException

Throws:

IOException

IllegalStateException

doFinal

public int doFinal(byte[] out,
 int outOff)
            throws IOException,
IllegalStateException

Throws:

IOException

IllegalStateException

reset

public void reset()