org.bouncycastle.crypto.modes
Class XChaCha20Poly1305

java.lang.Object
  org.bouncycastle.crypto.modes.ChaCha20Poly1305
      org.bouncycastle.crypto.modes.XChaCha20Poly1305

All Implemented Interfaces:

AEADCipher

public class XChaCha20Poly1305

extends ChaCha20Poly1305

XChaCha20-Poly1305 AEAD construction as described in draft-irtf-cfrg-xchacha-03 sec. 2.4.

Identical to ChaCha20Poly1305 except that the underlying stream cipher is XChaCha20Engine (192 bit nonce instead of 96 bit). The extended nonce makes random-nonce strategies safe at scale: with a 192 bit nonce, collisions remain negligibly likely up to 2^80 messages per key, removing the per-key counter / deterministic-nonce constraint that standard ChaCha20-Poly1305 imposes.

Constructor Summary

XChaCha20Poly1305()

XChaCha20Poly1305(Mac poly1305)

Method Summary

java.lang.String

getAlgorithmName() Return the name of the algorithm.

Methods inherited from class org.bouncycastle.crypto.modes.ChaCha20Poly1305

doFinal, getMac, getOutputSize, getUpdateOutputSize, init, processAADByte, processAADBytes, processByte, processBytes, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

XChaCha20Poly1305

public XChaCha20Poly1305()

XChaCha20Poly1305

public XChaCha20Poly1305(Mac poly1305)

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: AEADCipher

Return the name of the algorithm.

Specified by:

getAlgorithmName in interface AEADCipher

Overrides:

getAlgorithmName in class ChaCha20Poly1305