iaik.security.cipher

Class ChaCha20ParameterSpec

java.lang.Object

javax.crypto.spec.IvParameterSpec

iaik.security.cipher.ChaCha20ParameterSpec

All Implemented Interfaces:

java.security.spec.AlgorithmParameterSpec

Direct Known Subclasses:

ChaCha20Poly1305ParameterSpec

public class ChaCha20ParameterSpec
extends javax.crypto.spec.IvParameterSpec

ChaCha20 parameter specification.

This class represents parameters for the ChaCha20 stream cipher as specified by RFC 7539.

The parameters are a 96 bit nonce value (also known as initialization vector) and a 32 bit block counter (default: 0; usually 0 or 1). It is also possible to use a 64 bit nonce value but RFC 7539 recommends to use 96 bits.

Version:

File Revision 6

Constructor Summary

Constructors

Constructor and Description
ChaCha20ParameterSpec(byte[] nonce) Creates a ChaCha20ParameterSpec from the given nonce value.
ChaCha20ParameterSpec(byte[] nonce, int blockCounter) Creates a ChaCha20ParameterSpec from the given nonce and blockCounter values.

Method Summary

Methods

Modifier and Type	Method and Description
int	getBlockCounter() Gets the blockCounter value.
byte[]	getNonce() Gets the nonce value.

Methods inherited from class javax.crypto.spec.IvParameterSpec

getIV

Methods inherited from class java.lang.Object

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

Constructor Detail

ChaCha20ParameterSpec

public ChaCha20ParameterSpec(byte[] nonce,
                     int blockCounter)

Creates a ChaCha20ParameterSpec from the given nonce and blockCounter values.

Parameters:

nonce - the nonce value

blockCounter - the blockCounter

Throws:

java.lang.IllegalArgumentException - if nonce is not 96 or 64 bit long or blockCounter is negative

ChaCha20ParameterSpec

public ChaCha20ParameterSpec(byte[] nonce)

Creates a ChaCha20ParameterSpec from the given nonce value. The blockCounter value will be 0.

Parameters:

nonce - the nonce value

Throws:

java.lang.IllegalArgumentException - if nonce is not 96 or 64 bit long

Method Detail

getNonce

public byte[] getNonce()

Gets the nonce value.

Returns:

the nonce value

getBlockCounter

public int getBlockCounter()

Gets the blockCounter value.

Returns:

the blockCounter value