Java 类org.bouncycastle.crypto.ec.ECEncryptor 实例源码

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doTest(ECDomainParameters domainParams, AsymmetricCipherKeyPair[] kps, int threshold, boolean shouldPass, int... missing)
{
    int numberOfPeers = kps.length;

    // create the splitter for the peers/threshold over the order of the curve.
    ShamirSecretSplitter secretSplitter = new ShamirSecretSplitter(numberOfPeers, threshold, domainParams.getN(), new SecureRandom());

    // Having created a private key the server creates shares of that
    // private key. It would keep one share for itself and sends the others
    // shares to the other servers.
    BigInteger[][] privateKeyShares = new BigInteger[numberOfPeers][];
    BigInteger[] finalPrivateKeyShares = new BigInteger[numberOfPeers];
    for (int i = 0; i < numberOfPeers; i++)
    {
        privateKeyShares[i] = secretSplitter.split(((ECPrivateKeyParameters)kps[i].getPrivate()).getD()).getShares();
    }

    // Simulates distributing shares and combining them
    for (int i = 0; i < numberOfPeers; i++)
    {
        finalPrivateKeyShares[i] = privateKeyShares[0][i];
        for (int j = 1; j < numberOfPeers; j++)
        {
            finalPrivateKeyShares[i] = finalPrivateKeyShares[i].add(privateKeyShares[j][i]);
        }
    }

    ECPoint pubPoint = ((ECPublicKeyParameters)kps[0].getPublic()).getQ();

    for (int i = 1; i < numberOfPeers; i++)
    {
        pubPoint = pubPoint.add(((ECPublicKeyParameters)kps[i].getPublic()).getQ());
    }

    ECPublicKeyParameters jointPub = new ECPublicKeyParameters(pubPoint, domainParams);

    // Create a random plaintext
    ECPoint plaintext = generatePoint(domainParams, new SecureRandom());

    // Encrypt it using the joint public key
    ECEncryptor enc = new ECElGamalEncryptor();

    enc.init(new ParametersWithRandom(jointPub, new SecureRandom()));

    ECPair cipherText = enc.encrypt(plaintext);

    // do partial decrypts
    ECPoint[] partialDecs = new ECPoint[numberOfPeers];

    for (int i = 0; i < numberOfPeers; i++)
    {
        partialDecs[i] = cipherText.getX().multiply(finalPrivateKeyShares[i]);
    }

    // simulate missing peers
    for (int i = 0; i != missing.length; i++)
    {
        partialDecs[missing[i]] = null;
    }

    // decryption step
    LagrangeWeightCalculator lagrangeWeightCalculator = new LagrangeWeightCalculator(numberOfPeers, domainParams.getN());

    BigInteger[] weights = lagrangeWeightCalculator.computeWeights(partialDecs);

    // weighting
    ECPoint weightedDecryption = partialDecs[0].multiply(weights[0]);
    for (int i = 1; i < weights.length; i++)
    {
        if (partialDecs[i] != null)
        {
            weightedDecryption = weightedDecryption.add(partialDecs[i].multiply(weights[i]));
        }
    }

    // Do final decryption to recover plaintext ECPoint
    ECPoint decrypted = cipherText.getY().add(weightedDecryption.negate());

    Assert.assertEquals(shouldPass, plaintext.equals(decrypted));
}

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doSameKeyTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECPairTransform ecr = new ECNewRandomnessTransform();

    ecr.init(pRandom);

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doSameKeyTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECPairTransform ecr = new ECNewRandomnessTransform();

    ecr.init(pRandom);

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doSameKeyTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECPairTransform ecr = new ECNewRandomnessTransform();

    ecr.init(pRandom);

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(pair);

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECKeyPairGenerator ecGen = new ECKeyPairGenerator();

    ecGen.init(new ECKeyGenerationParameters(priKey.getParameters(), new SecureRandom()));

    AsymmetricCipherKeyPair reEncKP = ecGen.generateKeyPair();

    ECPairTransform ecr = new ECNewPublicKeyTransform();

    ecr.init(reEncKP.getPublic());

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt out the original private key
    ECPoint p = decryptor.decrypt(new ECPair(srcPair.getX(), pair.getY()));

    decryptor.init(reEncKP.getPrivate());

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(new ECPair(pair.getX(), p));

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECKeyPairGenerator ecGen = new ECKeyPairGenerator();

    ecGen.init(new ECKeyGenerationParameters(priKey.getParameters(), new SecureRandom()));

    AsymmetricCipherKeyPair reEncKP = ecGen.generateKeyPair();

    ECPairTransform ecr = new ECNewPublicKeyTransform();

    ecr.init(reEncKP.getPublic());

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt out the original private key
    ECPoint p = decryptor.decrypt(new ECPair(srcPair.getX(), pair.getY()));

    decryptor.init(reEncKP.getPrivate());

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(new ECPair(pair.getX(), p));

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}

private void doTest(ECPrivateKeyParameters priKey, ParametersWithRandom pRandom, BigInteger value)
{
    ECPoint data = priKey.getParameters().getG().multiply(value);

    ECEncryptor encryptor = new ECElGamalEncryptor();

    encryptor.init(pRandom);

    ECPair pair = encryptor.encrypt(data);

    ECKeyPairGenerator ecGen = new ECKeyPairGenerator();

    ecGen.init(new ECKeyGenerationParameters(priKey.getParameters(), new SecureRandom()));

    AsymmetricCipherKeyPair reEncKP = ecGen.generateKeyPair();

    ECPairTransform ecr = new ECNewPublicKeyTransform();

    ecr.init(reEncKP.getPublic());

    ECPair srcPair = pair;

    // re-encrypt the message portion
    pair = ecr.transform(srcPair);

    ECDecryptor decryptor = new ECElGamalDecryptor();

    decryptor.init(priKey);

    // decrypt out the original private key
    ECPoint p = decryptor.decrypt(new ECPair(srcPair.getX(), pair.getY()));

    decryptor.init(reEncKP.getPrivate());

    // decrypt the fully transformed point.
    ECPoint result = decryptor.decrypt(new ECPair(pair.getX(), p));

    if (!data.equals(result))
    {
        fail("point pair failed to decrypt back to original");
    }
}