1 files changed, 99 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/agreement/jpake/JPAKERound1Payload.java b/core/src/main/java/org/bouncycastle/crypto/agreement/jpake/JPAKERound1Payload.java
new file mode 100644
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--- /dev/null
+++ b/core/src/main/java/org/bouncycastle/crypto/agreement/jpake/JPAKERound1Payload.java
@@ -0,0 +1,99 @@
+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.
+ * <p/>
+ * <p/>
+ * 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()}.
+ * <p/>
+ * <p/>
+ * 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)}.
+ * <p/>
+ */
+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.
+     * <p/>
+     * This is a two element array, containing {g^v, r} for x1.
+     */
+    private final BigInteger[] knowledgeProofForX1;
+
+    /**
+     * The zero knowledge proof for x2.
+     * <p/>
+     * 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);
+    }
+
+}