Example usage for org.bouncycastle.crypto.engines IESEngine init

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.engines IESEngine init.

Prototype

public void init(AsymmetricKeyParameter privateKey, CipherParameters params, KeyParser publicKeyParser) 

Source Link

Document

Initialise the encryptor.

Usage

From source file:org.ethereum.crypto.CryptoTest.java

License:Open Source License

@Test // ECIES_AES128_SHA256 + Ephemeral Key + IV(all zeroes)
public void test15() throws Throwable {

    byte[] privKey = Hex.decode("a4627abc2a3c25315bff732cb22bc128f203912dd2a840f31e66efb27a47d2b1");

    ECKey ecKey = ECKey.fromPrivate(privKey);

    ECPrivateKeyParameters ecPrivKey = new ECPrivateKeyParameters(ecKey.getPrivKey(), ECKey.CURVE);
    ECPublicKeyParameters ecPubKey = new ECPublicKeyParameters(ecKey.getPubKeyPoint(), ECKey.CURVE);

    AsymmetricCipherKeyPair myKey = new AsymmetricCipherKeyPair(ecPubKey, ecPrivKey);

    AESEngine aesEngine = new AESEngine();

    IESEngine iesEngine = new IESEngine(new ECDHBasicAgreement(), new KDF2BytesGenerator(new SHA256Digest()),
            new HMac(new SHA256Digest()), new BufferedBlockCipher(new SICBlockCipher(aesEngine)));

    byte[] d = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
    byte[] e = new byte[] { 8, 7, 6, 5, 4, 3, 2, 1 };

    IESParameters p = new IESWithCipherParameters(d, e, 64, 128);
    ParametersWithIV parametersWithIV = new ParametersWithIV(p, new byte[16]);

    ECKeyPairGenerator eGen = new ECKeyPairGenerator();
    KeyGenerationParameters gParam = new ECKeyGenerationParameters(ECKey.CURVE, new SecureRandom());

    eGen.init(gParam);//  ww  w. ja  v a 2s.c  o  m

    ECKeyGenerationParameters keygenParams = new ECKeyGenerationParameters(ECKey.CURVE, new SecureRandom());
    ECKeyPairGenerator generator = new ECKeyPairGenerator();
    generator.init(keygenParams);

    EphemeralKeyPairGenerator kGen = new EphemeralKeyPairGenerator(generator, new KeyEncoder() {
        public byte[] getEncoded(AsymmetricKeyParameter keyParameter) {
            return ((ECPublicKeyParameters) keyParameter).getQ().getEncoded();
        }
    });

    ECKeyPairGenerator gen = new ECKeyPairGenerator();
    gen.init(new ECKeyGenerationParameters(ECKey.CURVE, new SecureRandom()));

    iesEngine.init(myKey.getPublic(), parametersWithIV, kGen);

    byte[] message = Hex.decode("010101");
    log.info("payload: {}", Hex.toHexString(message));

    byte[] cipher = iesEngine.processBlock(message, 0, message.length);
    log.info("cipher: {}", Hex.toHexString(cipher));

    IESEngine decryptorIES_Engine = new IESEngine(new ECDHBasicAgreement(),
            new KDF2BytesGenerator(new SHA256Digest()), new HMac(new SHA256Digest()),
            new BufferedBlockCipher(new SICBlockCipher(aesEngine)));

    decryptorIES_Engine.init(myKey.getPrivate(), parametersWithIV, new ECIESPublicKeyParser(ECKey.CURVE));

    byte[] orig = decryptorIES_Engine.processBlock(cipher, 0, cipher.length);

    log.info("orig: " + Hex.toHexString(orig));
}

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