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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.crypto.agreement.jpake;

import java.math.BigInteger;

import org.bouncycastle.util.Arrays;

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

* Each {@link JPAKEParticipant} creates and sends an instance * of this payload to the other {@link JPAKEParticipant}. * The payload to send should be created via * {@link JPAKEParticipant#createRound2PayloadToSend()} *

* Each {@link JPAKEParticipant} must also validate the payload * received from the other {@link JPAKEParticipant}. * The received payload should be validated via * {@link JPAKEParticipant#validateRound2PayloadReceived(JPAKERound2Payload)} */ public class JPAKERound2Payload { /** * The id of the {@link JPAKEParticipant} who created/sent this payload. */ private final String participantId; /** * The value of A, as computed during round 2. */ private final BigInteger a; /** * The zero knowledge proof for x2 * s. *

* This is a two element array, containing {g^v, r} for x2 * s. *

*/ private final BigInteger[] knowledgeProofForX2s; public JPAKERound2Payload( String participantId, BigInteger a, BigInteger[] knowledgeProofForX2s) { JPAKEUtil.validateNotNull(participantId, "participantId"); JPAKEUtil.validateNotNull(a, "a"); JPAKEUtil.validateNotNull(knowledgeProofForX2s, "knowledgeProofForX2s"); this.participantId = participantId; this.a = a; this.knowledgeProofForX2s = Arrays.copyOf(knowledgeProofForX2s, knowledgeProofForX2s.length); } public String getParticipantId() { return participantId; } public BigInteger getA() { return a; } public BigInteger[] getKnowledgeProofForX2s() { return Arrays.copyOf(knowledgeProofForX2s, knowledgeProofForX2s.length); } }




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