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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 first 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#createRound1PayloadToSend()}. *

* Each {@link JPAKEParticipant} must also validate the payload * received from the other {@link JPAKEParticipant}. * The received payload should be validated via * {@link JPAKEParticipant#validateRound1PayloadReceived(JPAKERound1Payload)}. */ public class JPAKERound1Payload { /** * The id of the {@link JPAKEParticipant} who created/sent this payload. */ private final String participantId; /** * The value of g^x1 */ private final BigInteger gx1; /** * The value of g^x2 */ private final BigInteger gx2; /** * The zero knowledge proof for x1. *

* This is a two element array, containing {g^v, r} for x1. *

*/ private final BigInteger[] knowledgeProofForX1; /** * The zero knowledge proof for x2. *

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

*/ private final BigInteger[] knowledgeProofForX2; public JPAKERound1Payload( String participantId, BigInteger gx1, BigInteger gx2, BigInteger[] knowledgeProofForX1, BigInteger[] knowledgeProofForX2) { JPAKEUtil.validateNotNull(participantId, "participantId"); JPAKEUtil.validateNotNull(gx1, "gx1"); JPAKEUtil.validateNotNull(gx2, "gx2"); JPAKEUtil.validateNotNull(knowledgeProofForX1, "knowledgeProofForX1"); JPAKEUtil.validateNotNull(knowledgeProofForX2, "knowledgeProofForX2"); this.participantId = participantId; this.gx1 = gx1; this.gx2 = gx2; this.knowledgeProofForX1 = Arrays.copyOf(knowledgeProofForX1, knowledgeProofForX1.length); this.knowledgeProofForX2 = Arrays.copyOf(knowledgeProofForX2, knowledgeProofForX2.length); } public String getParticipantId() { return participantId; } public BigInteger getGx1() { return gx1; } public BigInteger getGx2() { return gx2; } public BigInteger[] getKnowledgeProofForX1() { return Arrays.copyOf(knowledgeProofForX1, knowledgeProofForX1.length); } public BigInteger[] getKnowledgeProofForX2() { return Arrays.copyOf(knowledgeProofForX2, knowledgeProofForX2.length); } }




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