Class ChaCha20ParameterSpec

java.lang.Object

javax.crypto.spec.ChaCha20ParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec

public final class ChaCha20ParameterSpec
extends Object
implements AlgorithmParameterSpec

This class specifies the parameters used with the ChaCha20 algorithm.

The parameters consist of a 12-byte nonce and an initial counter value expressed as a 32-bit integer.

This class can be used to initialize a Cipher object that implements the ChaCha20 algorithm.

Since:

11

External Specifications

• RFC 7539: ChaCha20 and Poly1305 for IETF Protocols

Constructor Summary

Constructors

Constructor	Description
ChaCha20ParameterSpec(byte[] nonce, int counter)	Constructs a parameter set for ChaCha20 from the given nonce and counter.

Method Summary

Modifier and Type	Method	Description
int	getCounter()	Returns the configured counter value.
byte[]	getNonce()	Returns the nonce value.

Methods declared in class java.lang.Object

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

Constructor Details

ChaCha20ParameterSpec

public ChaCha20ParameterSpec(byte[] nonce,
 int counter)

Constructs a parameter set for ChaCha20 from the given nonce and counter.

Parameters:

nonce - a 12-byte nonce value

counter - the initial counter value

Throws:

NullPointerException - if nonce is null

IllegalArgumentException - if nonce is not 12 bytes in length

Method Details

getNonce

public byte[] getNonce()

Returns the nonce value.

Returns:

the nonce value. This method returns a new array each time this method is called.

getCounter

public int getCounter()

Returns the configured counter value.

Returns:

the counter value