Package net.tomp2p.message

Examples of net.tomp2p.message.RSASignatureCodec


    try {
    KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");

    // create custom RSA factories
    SignatureFactory factory = new RSASignatureFactory();
    SignatureCodec codec = new RSASignatureCodec();

    // replace default signature factories
    ChannelClientConfiguration clientConfig = PeerBuilder.createDefaultChannelClientConfiguration();
    clientConfig.signatureFactory(factory);
    ChannelServerConfiguration serverConfig = PeerBuilder.createDefaultChannelServerConfiguration();
    serverConfig.signatureFactory(factory);

    KeyPair keyPairPeer1 = gen.generateKeyPair();
    p1 = new PeerBuilderDHT(new PeerBuilder(Number160.createHash(1)).ports(4834).keyPair(keyPairPeer1)
            .channelClientConfiguration(clientConfig)
            .channelServerConfiguration(serverConfig).start()).start();
    KeyPair keyPairPeer2 = gen.generateKeyPair();
    p2 = new PeerBuilderDHT(new PeerBuilder(Number160.createHash(2)).masterPeer(p1.peer()).keyPair(keyPairPeer2)
            .channelClientConfiguration(clientConfig)
            .channelServerConfiguration(serverConfig).start()).start();

    p2.peer().bootstrap().peerAddress(p1.peerAddress()).start().awaitUninterruptibly();
    p1.peer().bootstrap().peerAddress(p2.peerAddress()).start().awaitUninterruptibly();

    KeyPair keyPairOld = gen.generateKeyPair();
    KeyPair keyPairNew = gen.generateKeyPair();

    Number160 lKey = Number160.createHash("location");
    Number160 dKey = Number160.createHash("domain");
    Number160 cKey = Number160.createHash("content");
    Number160 vKey = Number160.createHash("version");
    Number160 bKey = Number160.ZERO;

    int ttl = 10;

    String testData = "data";
    Data data = new Data(testData).protectEntryNow(keyPairOld, factory);
    data.ttlSeconds(ttl).addBasedOn(bKey);

    // initial put of some test data
    FuturePut futurePut = p1.put(lKey).domainKey(dKey).data(cKey, data).versionKey(vKey)
            .keyPair(keyPairOld).start();
    futurePut.awaitUninterruptibly();
    Assert.assertTrue(futurePut.isSuccess());

    // create signature with old key pair having the data object
    byte[] signature1 = factory.sign(keyPairOld.getPrivate(), data.buffer()).encode();

    // decrypt signature to get hash of the object
    Cipher rsa = Cipher.getInstance("RSA");
    rsa.init(Cipher.DECRYPT_MODE, keyPairOld.getPublic());
    byte[] hash = rsa.doFinal(signature1);

    // encrypt hash with new key pair to get the new signature (without
    // having the data object)
    rsa = Cipher.getInstance("RSA");
    rsa.init(Cipher.ENCRYPT_MODE, keyPairNew.getPrivate());
    byte[] signatureNew = rsa.doFinal(hash);

    // verify old content protection keys
    Data retData = p1.get(lKey).domainKey(dKey).contentKey(cKey).versionKey(vKey).start()
            .awaitUninterruptibly().data();
    Assert.assertTrue(retData.verify(keyPairOld.getPublic(), factory));

    // create a dummy data object for changing the content protection key
    // through a put meta
    Data dummyData = new Data();
    dummyData.addBasedOn(bKey).ttlSeconds(ttl);
    // assign the reused hash from signature (don't forget to set the
    // signedflag)
    dummyData.signature(codec.decode(signatureNew)).signed(true).duplicateMeta();
    // change content protection key through a put meta
    FuturePut futurePutMeta = p1.put(lKey).domainKey(dKey).putMeta().data(cKey, dummyData)
            .versionKey(vKey).keyPair(keyPairOld).start();
    futurePutMeta.awaitUninterruptibly();
    Assert.assertTrue(futurePutMeta.isSuccess());
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      signature.update(buffer);
    }
   
    byte[] signatureData = signature.sign();

    SignatureCodec decodedSignature = new RSASignatureCodec();
    decodedSignature.decode(signatureData);
    return decodedSignature;
  }
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    return signature;
  }

  @Override
    public SignatureCodec signatureCodec() {
      return new RSASignatureCodec();
    }
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