JPAKERound2Payload (Bouncy Castle Library 1.85 API Specification)
Date: 2026-07-12

org.bouncycastle.crypto.agreement.jpake

## Class JPAKERound2Payload

- java.lang.Object
- - org.bouncycastle.crypto.agreement.jpake.JPAKERound2Payload

-     public class JPAKERound2Payload
      extends java.lang.Object

  The payload sent/received during the second round of a J-PAKE exchange.

  Each `JPAKEParticipant` creates and sends an instance of this payload to the other `JPAKEParticipant`. The payload to send should be created via `JPAKEParticipant.createRound2PayloadToSend()`

  Each `JPAKEParticipant` must also validate the payload received from the other `JPAKEParticipant`. The received payload should be validated via `JPAKEParticipant.validateRound2PayloadReceived(JPAKERound2Payload)`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `JPAKERound2Payload(java.lang.String participantId, java.math.BigInteger a, java.math.BigInteger[] knowledgeProofForX2s)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.math.BigInteger` | `getA()`
    `java.math.BigInteger[]` | `getKnowledgeProofForX2s()`
    `java.lang.String` | `getParticipantId()`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### JPAKERound2Payload

          public JPAKERound2Payload(java.lang.String participantId,
                                    java.math.BigInteger a,
                                    java.math.BigInteger[] knowledgeProofForX2s)

  - ### Method Detail

    - #### getParticipantId

          public java.lang.String getParticipantId()

    - #### getA

          public java.math.BigInteger getA()

    - #### getKnowledgeProofForX2s

          public java.math.BigInteger[] getKnowledgeProofForX2s()