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package org.spongycastle.crypto.agreement.test;
import java.math.BigInteger;
import java.security.SecureRandom;
import junit.framework.TestCase;
import org.spongycastle.crypto.CryptoException;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.agreement.jpake.JPAKEPrimeOrderGroup;
import org.spongycastle.crypto.agreement.jpake.JPAKEPrimeOrderGroups;
import org.spongycastle.crypto.agreement.jpake.JPAKEUtil;
import org.spongycastle.crypto.digests.SHA1Digest;
import org.spongycastle.crypto.digests.SHA256Digest;
public class JPAKEUtilTest
extends TestCase
{
private static final BigInteger TEN = BigInteger.valueOf(10);
public void testValidateGx4()
throws CryptoException
{
JPAKEUtil.validateGx4(TEN);
try
{
JPAKEUtil.validateGx4(BigInteger.ONE);
fail();
}
catch (CryptoException e)
{
// pass
}
}
public void testValidateGa()
throws CryptoException
{
JPAKEUtil.validateGa(TEN);
try
{
JPAKEUtil.validateGa(BigInteger.ONE);
fail();
}
catch (CryptoException e)
{
// pass
}
}
public void testValidateParticipantIdsDiffer()
throws CryptoException
{
JPAKEUtil.validateParticipantIdsDiffer("a", "b");
JPAKEUtil.validateParticipantIdsDiffer("a", "A");
try
{
JPAKEUtil.validateParticipantIdsDiffer("a", "a");
fail();
}
catch (CryptoException e)
{
// pass
}
}
public void testValidateParticipantIdsEqual()
throws CryptoException
{
JPAKEUtil.validateParticipantIdsEqual("a", "a");
try
{
JPAKEUtil.validateParticipantIdsEqual("a", "b");
fail();
}
catch (CryptoException e)
{
// pass
}
}
public void testValidateMacTag()
throws CryptoException
{
JPAKEPrimeOrderGroup pg1 = JPAKEPrimeOrderGroups.SUN_JCE_1024;
SecureRandom random = new SecureRandom();
Digest digest = new SHA256Digest();
BigInteger x1 = JPAKEUtil.generateX1(pg1.getQ(), random);
BigInteger x2 = JPAKEUtil.generateX2(pg1.getQ(), random);
BigInteger x3 = JPAKEUtil.generateX1(pg1.getQ(), random);
BigInteger x4 = JPAKEUtil.generateX2(pg1.getQ(), random);
BigInteger gx1 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x1);
BigInteger gx2 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x2);
BigInteger gx3 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x3);
BigInteger gx4 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x4);
BigInteger gB = JPAKEUtil.calculateGA(pg1.getP(), gx3, gx1, gx2);
BigInteger s = JPAKEUtil.calculateS("password".toCharArray());
BigInteger xs = JPAKEUtil.calculateX2s(pg1.getQ(), x4, s);
BigInteger B = JPAKEUtil.calculateA(pg1.getP(), pg1.getQ(), gB, xs);
BigInteger keyingMaterial = JPAKEUtil.calculateKeyingMaterial(pg1.getP(), pg1.getQ(), gx4, x2, s, B);
BigInteger macTag = JPAKEUtil.calculateMacTag("participantId", "partnerParticipantId", gx1, gx2, gx3, gx4, keyingMaterial, digest);
// should succed
JPAKEUtil.validateMacTag("partnerParticipantId", "participantId", gx3, gx4, gx1, gx2, keyingMaterial, digest, macTag);
// validating own macTag (as opposed to the other party's mactag)
try
{
JPAKEUtil.validateMacTag("participantId", "partnerParticipantId", gx1, gx2, gx3, gx4, keyingMaterial, digest, macTag);
fail();
}
catch (CryptoException e)
{
// pass
}
// participant ids switched
try
{
JPAKEUtil.validateMacTag("participantId", "partnerParticipantId", gx3, gx4, gx1, gx2, keyingMaterial, digest, macTag);
fail();
}
catch (CryptoException e)
{
// pass
}
}
public void testValidateNotNull()
{
JPAKEUtil.validateNotNull("a", "description");
try
{
JPAKEUtil.validateNotNull(null, "description");
fail();
}
catch (NullPointerException e)
{
// pass
}
}
public void testValidateZeroKnowledgeProof()
throws CryptoException
{
JPAKEPrimeOrderGroup pg1 = JPAKEPrimeOrderGroups.SUN_JCE_1024;
SecureRandom random = new SecureRandom();
Digest digest1 = new SHA256Digest();
BigInteger x1 = JPAKEUtil.generateX1(pg1.getQ(), random);
BigInteger gx1 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x1);
String participantId1 = "participant1";
BigInteger[] zkp1 = JPAKEUtil.calculateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx1, x1, participantId1, digest1, random);
// should succeed
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx1, zkp1, participantId1, digest1);
// wrong group
JPAKEPrimeOrderGroup pg2 = JPAKEPrimeOrderGroups.NIST_3072;
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg2.getP(), pg2.getQ(), pg2.getG(), gx1, zkp1, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// wrong digest
Digest digest2 = new SHA1Digest();
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx1, zkp1, participantId1, digest2);
fail();
}
catch (CryptoException e)
{
// pass
}
// wrong participant
String participantId2 = "participant2";
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx1, zkp1, participantId2, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// wrong gx
BigInteger x2 = JPAKEUtil.generateX1(pg1.getQ(), random);
BigInteger gx2 = JPAKEUtil.calculateGx(pg1.getP(), pg1.getG(), x2);
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx2, zkp1, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// wrong zkp
BigInteger[] zkp2 = JPAKEUtil.calculateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx2, x2, participantId1, digest1, random);
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), gx1, zkp2, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// gx <= 0
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), BigInteger.ZERO, zkp1, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// gx >= p
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), pg1.getP(), zkp1, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
// gx mod q == 1
try
{
JPAKEUtil.validateZeroKnowledgeProof(pg1.getP(), pg1.getQ(), pg1.getG(), pg1.getQ().add(BigInteger.ONE), zkp1, participantId1, digest1);
fail();
}
catch (CryptoException e)
{
// pass
}
}
}
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